JP2017020650A - Installation method for desorption arrester for fluid pipe and desorption arrester for fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an installation method for desorption arrester for fluid pipe and a desorption arrester for fluid pipe capable of reducing its cost while assuring a desorption prevention function and showing a superior workability when it is installed.SOLUTION: This invention includes an outer fitting step for outward fitting a housing 30 into an insertion port 2 and an engaging step for engaging a plurality of engaging members to an outer peripheral surface of the insertion port 2. Second engaging members 32 not provided with push bolts 34 are held in storing grooves in such a manner that their attitudes can be changed between an equal attitude where their extremity end protrusions may become equal along a circumferential direction under a state in which their extremity ends are protruded out of the storing grooves and a slant attitude where their protrusions of the extremity ends may become small along their peripheral direction. In the outer fitting step, the extremity ends of the first engaging members 31 provided with the push bolts 34 are set not to be protruded out of the storing grooves and after the second engaging members 32 are set to the slant attitude, the housing 30 is outward fitted to the insertion port 2. In the engaging step. each of the first engaging members 31 moved toward the insertion port 2 and the second engaging members 32 kept under the equal attitude are engaged with the outer peripheral surface of the insertion port 2.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a mounting method of a fluid pipe detachment prevention device and a fluid pipe detachment prevention device.

  In a connection place of a fluid pipe such as a water pipe, a detachment prevention device may be used for a pipe joint formed by inserting an insertion opening of the other pipe into a receiving opening of one pipe. Such a fluid pipe detachment preventing device is applied to, for example, a push ring in a mechanical type pipe joint, and is applied to a pipe opening in a slip-on type pipe joint. The pusher wheel is attached to the outer periphery of the insertion opening, and presses the sealing material interposed in the gap in order to seal the gap between the receiving opening and the insertion opening.

  In the push wheels described in Patent Documents 1 to 4, a housing groove is formed in an annular housing, and a push bolt that is a pressing member is provided in each of the plurality of locking members housed in the housing groove. According to such a configuration, since each of the locking members is locked to the outer peripheral surface of the insertion opening by the operation of the push bolt, it is possible to prevent the insertion opening from being detached from the receiving opening. In Patent Documents 1 to 3, a housing made of an undivided annular body is used. When the pipe diameter is large, a housing made of a divided annular body as in Patent Document 4 may be used.

  Thus, conventionally, since each of the plurality of locking members is provided with a pressing member, the same number of pressing members as the locking member are required, and a mounting hole for inserting them is provided in the housing. It had to be formed and the cost tended to increase. In particular, when the housing is formed of an undivided annular body, the diameter of the housing itself cannot be reduced. Therefore, it has been considered that a pressing member is indispensable for locking the locking member to the outer peripheral surface of the insertion opening.

  Therefore, in order to reduce the cost while ensuring the separation prevention function, the present inventor omits the pressing member with several locking members, and holds the tip so that they can be locked to the outer peripheral surface of the insertion slot. A structure has been conceived in which the locking member is held in a state of protruding from the receiving groove. However, by making the tip of the locking member protrude, the gap between the small housing and the insertion opening is further reduced. As a result, it has been found that it is difficult to externally fit the housing to the insertion opening without damaging the outer peripheral surface of the insertion opening with the locking member, and the workability at the time of mounting is deteriorated.

  Patent Document 5 describes a push wheel in which the pressing member is omitted in some of the plurality of locking members. However, regarding the deterioration in workability due to the protrusion of the tip of the locking member as described above, the means for solving the problem. It does not suggest.

JP 2013-167329 A JP2012-087846A JP 2008-309186 A JP 2003-222279 A Japanese Utility Model Publication No. 55-31338

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mounting method for a fluid pipe detachment prevention device that can reduce costs while ensuring a detachment prevention function and yet has excellent workability at the time of mounting, and its An object of the present invention is to provide a fluid pipe detachment prevention device.

  The above object can be achieved by the present invention as described below. That is, in the method for mounting the fluid pipe disengagement prevention device according to the present invention, the insertion opening of the other pipe is inserted into the reception opening of one pipe, and the non-dividing is formed separately or integrally with the reception opening. An outer fitting step of fitting a housing formed of an annular body to the insertion opening, and a plurality of locking members accommodated in an accommodation groove opening toward the outer circumferential surface of the insertion opening. A plurality of locking members, wherein the plurality of locking members are provided with a pressing member inserted into the mounting hole of the housing; The second locking member is not provided with the pressing member, and the second locking member is evenly projected along the circumferential direction with the tip protruding from the receiving groove. Between the uniform posture and the inclined posture in which the protrusion at the tip becomes smaller along the circumferential direction. It is held in the receiving groove so that the posture can be changed, and in the external fitting step, the tip end of the first locking member does not protrude from the receiving groove, and the second locking member is inclined. Then, the housing is externally fitted to the insertion opening, and in the locking step, the first locking member moved toward the insertion opening by the operation of the pressing member and the first locking member in an equal posture. The two locking members are respectively locked to the outer peripheral surface of the insertion opening.

  In this method, a separation preventing device in which a pressing member is not provided on the second locking member is used. Therefore, the number of pressing members can be reduced as compared with the prior art, and processing for forming the mounting hole in the housing can be reduced, which contributes to cost reduction. In the outer fitting step, the tip of the second locking member is placed in a state in which the tip of the first locking member does not protrude from the housing groove and the second locking member is inclined, and then the housing is fitted to the insertion slot. Deterioration of workability due to the protrusion of can be avoided. In the locking step, the first locking member moved toward the insertion port by operating the pressing member is locked to the outer peripheral surface of the insertion port. The second locking member is not provided with a pressing member, but is held in a state in which the tip protrudes from the receiving groove, and takes a uniform posture in the locking process. The two locking members can be properly locked.

  In the external fitting step, the second locking member is disposed below while the first locking member is disposed upward, and the second locking member is inclined so that the protrusion at the tip becomes smaller upward. It is preferable that the housing, which is in a posture and is eccentric downward with respect to the insertion slot, is externally fitted to the insertion slot. According to such a method, the tip of the first locking member disposed above does not protrude from the receiving groove, and the protrusion of the tip of the second locking member disposed below becomes smaller upward. An insertable space is formed above the interior of the housing. Therefore, by decentering the housing downward with respect to the insertion opening (for example, depositing a push ring at the insertion opening), the housing can be easily fitted on the insertion opening, and the workability at the time of mounting is improved. In addition, arranging the second locking member that does not require the operation of the pressing member below contributes to improved workability in the excavation groove.

  In the above, it is preferable that the first locking member is arranged only in the upper half circumference of the housing, and two or three second locking members are arranged in the lower half circumference of the housing. Thereby, operation of a press member can be made unnecessary in the lower half circumference of a housing. In addition, since the number of the second locking members is moderately suppressed, the contact balance of each locking member with respect to the outer peripheral surface of the insertion opening becomes good.

  It is preferable that the second locking member is changed from the inclined posture to the uniform posture by the action of the outer peripheral surface of the insertion opening pressing against the tip of the second locking member. Thereby, the attitude | position of a 2nd locking member can be changed via an insertion port, and the workability | operativity at the time of mounting | wearing becomes more favorable.

  Further, the fluid pipe detachment preventing device according to the present invention is a fluid pipe detachment preventing apparatus used for a pipe joint formed by inserting an insertion port of the other pipe into a receiving port of one pipe. A non-divided annular body formed separately or integrally, and a housing that is externally fitted to the insertion port, a plurality of locking members that are locked to the outer peripheral surface of the insertion port, and an outer periphery of the insertion port A receiving groove that opens toward the surface and accommodates the plurality of locking members; and a pressing member that is inserted through the mounting hole of the housing, wherein the pressing members are provided with the pressing members. The first locking member and the second locking member not provided with the pressing member, and the first locking member can be moved in the radial direction by the operation of the pressing member, The two locking members have their tips protruding from the receiving groove, and the tips of their tips Equivalency posture becomes uniform along the direction, so may alter the orientation between the smaller inclined posture projection of the tip along the circumferential direction, it is what is held in the accommodating groove.

  In this apparatus, the second locking member is not provided with a pressing member. Therefore, the number of pressing members can be reduced as compared with the prior art, and processing for forming the mounting hole in the housing can be reduced, which contributes to cost reduction. In addition, since the first locking member is moved in the tube radial direction by the operation of the pressing member and the second locking member is held in a state where the tip protrudes from the receiving groove, each locking member is inserted into the insertion slot. Can be locked to the outer peripheral surface. The second locking member is held so that the posture can be changed between the uniform posture and the inclined posture. The inclined posture is useful for avoiding deterioration in workability due to the protrusion of the tip of the second locking member when the housing is externally fitted to the insertion slot. The uniform posture is useful for securing the detachment preventing function by locking the tip of the second locking member evenly when locking the second locking member to the outer peripheral surface of the insertion slot.

  The accommodation groove is not in contact with the first inner surface portion that is in surface contact with the outer surface of the central portion of the second locking member in the uniform posture and the outer surface of the end portion of the second locking member in the uniform posture and is inclined. What is provided with the 2nd inner surface part which contacts the edge part outer surface of the said 2nd locking member of a posture is preferable. According to this configuration, it is possible to realize a structure in which the second locking member can change the posture between the uniform posture and the inclined posture by simple modification of the housing groove.

  The first locking member may be disposed only on a half circumference of the housing, and two or three second locking members may be disposed on the remaining half circumference of the housing. Thereby, operation of a press member can be made unnecessary in the half circumference of the housing. In addition, since the number of the second locking members is moderately suppressed, the contact balance of each locking member with respect to the outer peripheral surface of the insertion opening becomes good.

  The total number of the plurality of locking members may be 4 or more, and one or two of them may be the second locking member. According to this structure, the ratio of the 2nd latching member to the whole is restrained moderately, and the contact balance of each latching member with respect to the outer peripheral surface of an insertion port becomes favorable.

  A plurality of through holes extending in the tube axis direction may be formed at a plurality of locations in the tube circumferential direction on the outer peripheral surface of the housing, and the total number of the plurality of locking members may be smaller than the number of the through holes. Usually, since a locking member is provided between a pair of through holes adjacent in the circumferential direction, the number of locking members is the same as the number of through holes. On the other hand, according to the said structure, a number of parts can be reduced regarding a locking member.

Front view of push wheel when installed AA sectional view of the press ring in FIG. BB sectional view of the press ring in FIG. Front view of the push ring before installation Sectional drawing for demonstrating an external fitting process Sectional drawing for demonstrating a sealing process Cross section of push ring when using sheet material Front view of push wheel according to another embodiment Sectional drawing which shows the 2nd locking member of (a) equal attitude | position and (b) inclination attitude | position Front view of a press wheel with the second locking member in an inclined posture The figure for demonstrating operation | movement of a 1st locking member Front view of push wheel according to another embodiment

  First, a “reference form” relating to the structure of a push wheel (an example of a fluid pipe detachment prevention device) and its mounting method will be described with reference to FIGS. Next, an “embodiment of the present invention” will be described with reference to FIGS. As will be described later, the “embodiment of the present invention” is obtained by applying a configuration in which the second locking member can change the posture between the uniform posture and the inclined posture in the “reference embodiment”.

[Reference form]
1 to 3 show a pusher wheel 3 used for a pipe joint in which an insertion port 2 of the other pipe P2 is inserted into a receiving port 1 of one pipe P1. Each of the pipes P1 and P2 is a ductile cast iron pipe for waterworks buried in the ground. However, it is not restricted to this, For example, a steel pipe, a vinyl chloride pipe, a polyethylene pipe, a polyolefin pipe, and other fluid pipes may be used. The fluid flowing inside the pipes P1 and P2 is not limited to clean water, but may be industrial water, sewage, gas, a gas-liquid mixture of gas and liquid, or the like.

  The tubes P1 and P2 are connected by inserting the insertion port 2 into the reception port 1. An annular sealing material 4 for sealing the gap is disposed in the gap between the receptacle 1 and the insertion slot 2 inserted therein. The end portion of the receiving port 1 is formed with a diameter-enlarged portion 1a that expands toward the end surface, and a flange portion 1b that extends outward in the tube diameter direction, and the sealing material 4 is pushed into the enlarged-diameter portion 1a. ing. The pusher wheel 3 pushes the sealing material 4 in the tube axis direction and pushes it into the enlarged diameter portion 1a, thereby ensuring a sealed state.

  The push ring 3 includes a housing 30 that is externally fitted to the insertion slot 2, a plurality of locking members that are locked to the outer peripheral surface of the insertion slot 2, an accommodation groove 33 that accommodates the plurality of locking members, And a pressing bolt 34 as a pressing member inserted through the mounting hole. The plurality of locking members include a first locking member 31 provided with a push bolt 34 and a second locking member 32 provided with no push bolt 34. The housing 30 is formed of a non-divided annular body formed separately from the receiving port 1 and is integrally provided continuously in the pipe circumferential direction. The inner diameter of the housing 30 is larger than the outer diameter of the insertion slot 2 (the outer diameter of the pipe P2), and the distal ends of the respective locking members protruding from the housing grooves 33 are locked to the outer peripheral surface of the insertion slot 2.

  On the outer peripheral surface of the housing 30, through holes 35 extending in the tube axis direction are formed at a plurality of locations (four locations in the example of FIG. 1) in the tube circumferential direction. As shown in FIG. 3, a fastener 36 composed of a bolt and a nut is attached to the through hole 35 and the through hole of the flange portion 1b. As a result, the pusher wheel 3 is fixed to the receiving port 1 and the centering (centering) of the pusher wheel 3 with respect to the receiving port 1 is performed. In addition, the seal member 4 can be pressed by operating the fastener 36 and moving the pusher wheel 3 toward the receiving port 1.

  The housing groove 33 opens toward the outer peripheral surface of the insertion slot 2 and is formed on the inner peripheral surface of the housing 30. The housing groove 33 is formed as an annular groove continuously extending in the pipe circumferential direction, but a plurality of arc-shaped housing grooves may be formed intermittently. As shown in the upper side of FIG. 2, in the place where the first locking member 31 is provided, an attachment hole for inserting the push bolt 34 is provided so as to penetrate the bottom surface of the accommodation groove 33. Further, as shown in the lower side of FIG. 2, the bottom surface of the housing groove 33 is inclined in the direction in which the diameter increases toward the receiving port 1 at the location where the second locking member 32 is disposed.

  The pusher wheel 3 includes a plurality of (four in the example of FIG. 1) locking members including a first locking member 31 and a second locking member 32, and these are arranged in a pipe circumferential direction. It is accommodated in the accommodation groove 33. In this reference form, the total number of the plurality of locking members is 4, two of which are the first locking members 31 and the other two are the second locking members 32. The first locking member 31 is disposed on the upper side, and the second locking member 32 is disposed on the lower side. Each of these locking members is locked to the outer peripheral surface of the insertion slot 2, thereby preventing the insertion slot 2 from being detached from the receiving slot 1.

  The 1st locking member 31 and the 2nd locking member 32 are comprised by the arch-shaped member each curved along the pipe peripheral direction, and the front-end | tip of those inner peripheral sides is protrudingly provided by the nail | claw shape. Of the first locking member 31 and the second locking member 32, only the first locking member 31 is provided with a push bolt 34, and the first locking member 31 is moved in the pipe diameter direction by operating the push bolt 34. Is possible. Further, the second locking member 32 is held in the receiving groove 33 with the tip protruding from the receiving groove 33. In this reference embodiment, the first locking member 31 and the second locking member 32 are formed of the same member, and only the mode of combining them with the housing 30 is different.

  In this reference form, as shown in FIG. 3, the tip of the first locking member 31 or the second locking member 32 and the tip of another first locking member 31 or the second locking member 32 adjacent to the tip. However, it is configured such that a region where the distal end of the locking member contacts the outer peripheral surface of the insertion opening 2 is continuous in the tube circumferential direction. Such a configuration of the locking member is disclosed in, for example, Patent Document 3 by the present applicant. However, the present invention is not limited to this.

  The push bolt 34 is screwed into a mounting hole which is a screw hole, and the first locking member 31 moves in the pipe radial direction by rotating the push bolt 34. The front end surface of the push bolt 34 is inclined in the direction of increasing the diameter toward the receiving port 1 and is in contact with the outer peripheral surface of the first locking member 31. FIG. 4 shows a state before installation without tightening the push bolt 34, and the tip of the first locking member 31 does not protrude from the housing groove 33. Thus, the 1st latching member 31 can move between the state (refer FIGS. 1-3) which protruded the front-end | tip from the accommodation groove 33, and the state (refer FIGS. 4-6) which does not protrude. .

  As described above, in the pusher wheel 3, the push bolt 34 is provided only on the first locking member 31, and the push bolt 34 is not provided on the second locking member 32. Therefore, in the prior art, the same number of push bolts as the locking members are required, whereas in the pusher wheel 3, the number of push bolts 34 is smaller than the number of the locking members. As shown in the lower part of FIG. 2, the mounting hole for inserting the push bolt 34 is not provided at the location where the second locking member 32 is provided, and the formation of the mounting hole is omitted. Since the formation of the mounting hole, which is a screw hole, requires drilling and tapping, the effect of cost reduction by omitting this is great.

  In the pusher wheel 3, the first locking member 31 can move in the tube radial direction by the operation of the pusher bolt 34, so that the insertion slot 2 is inserted at a required timing after the housing 30 is fitted on the insertion slot 2. The first locking member 31 can be locked to the outer peripheral surface. In addition, since the second locking member 32 is in a state in which the tip protrudes from the receiving groove 33, the second locking member 32 is placed on the outer peripheral surface of the insertion port 2 when the housing 30 is externally fitted to the insertion port 2. It can be locked. Therefore, both of the locking members can be locked to the outer peripheral surface of the insertion slot 2, and the function of preventing separation by the pusher wheel 3 is ensured.

  The outer peripheral surfaces of the first locking member 31 and the second locking member 32 are each provided with an inclined surface that is inclined in the direction of increasing the diameter toward the receiving port 1. The tip surface of the push bolt 34 inclined in the same direction contacts the inclined surface of the first locking member 31, and the bottom surface of the receiving groove 33 inclined in the same direction contacts the inclined surface of the second locking member 32. Touch. When an external force in the tube axis direction that causes the insertion port 2 to be detached from the receiving port 1 is applied, the respective locking members are strongly pressed toward the outer peripheral surface of the insertion port 2 by the wedge effect, and the separation preventing function can be enhanced.

  In this reference form, the depth of the receiving groove 33 at the location where the second locking member 32 is disposed is smaller than the depth of the receiving groove 33 at the location where the first locking member 31 is provided. The front ends of the two locking members 32 are protruded from the accommodation groove 33. The depth of the accommodation groove 33 is measured, for example, at the center of the accommodation groove 33 in the groove width direction. At the place where the first locking member 31 is disposed, a movement allowance in the tube diameter direction is necessary, and thus the depth of the accommodation groove 33 is relatively large. The position of the second locking member 32 in the tube diameter direction is determined by the depth of the receiving groove 33. When the pusher wheel 3 is centered (centered) with respect to the insertion slot 2, the tip of the second locking member 32 is It is set so that it can be locked to the outer peripheral surface of the insertion slot 2.

  In this reference embodiment, a movement allowance is provided in which each locking member can move in the tube axis direction within the accommodation groove 33. Such a movement allowance is used to produce the wedge effect described above. Further, regardless of the position of the second locking member 32 in the housing groove 33, the tip of the second locking member 32 is configured to always protrude from the housing groove 33. Thereby, the 2nd latching member 32 is latched appropriately to the outer peripheral surface of the insertion port 2, and the separation prevention function can be ensured satisfactorily. Between the side surface of each locking member and the wall surface of the receiving groove 33, an elastic material (elastic material 6 in FIG. 9) for preventing the locking member from dropping is interposed, and these are compressed and deformed. Can move in the tube axis direction.

  As shown in FIG. 2, at the location of the first locking member 31 where the push bolt 34 is provided, the second lock that does not include the push bolt 34 although the outer diameter of the housing 30 needs to be relatively large. At the location where the member 32 is disposed, the outer diameter of the housing 30 can be made relatively small. Thus, in the setting location of the 2nd locking member 32, compared with the setting location of the 1st locking member 31, the outer diameter of the housing 30 is made small, and the volume of the housing 30 is reduced by that much and the cost reduction is aimed at. be able to.

  In this reference embodiment, the pusher wheel 3 is mounted by the following method. First, the press ring 3 is prepared, and the housing 30 is externally fitted to the insertion slot 2 as shown in FIG. 5 (external fitting process). Next, as shown in FIG. 6, the sealing material 4 interposed in the gap between the receiving port 1 and the insertion port 2 inserted into the receiving port 1 is pressed into a sealed state, and the pusher wheel 3 is fixed to the receiving port 1 (sealing process). Then, as shown in FIGS. 2 and 3, the first locking member 31 is moved toward the insertion slot 2 by operating the push bolt 34, and the distal ends of the first locking member 31 and the second locking member 32 are moved. Are respectively locked to the outer peripheral surface of the insertion slot 2 (locking step).

  In the outer fitting process shown in FIG. 5, the first locking member 31 is disposed on the upper side, the second locking member 32 is disposed on the lower side, and the tip of the first locking member 31 disposed on the upper side is the receiving groove. The housing 30 is externally fitted to the insertion slot 2 so that it does not protrude from 33. Thereby, when the press ring 3 is deposited in the insertion slot 2, the outer peripheral surface of the insertion slot 2 positioned above the inner periphery of the housing 30 does not have to be damaged. Since the outer peripheral surface of the insertion opening 2 is coated with anticorrosion paint or the like, such a preventive measure is useful.

  Similarly, from the viewpoint of preventing the outer peripheral surface of the insertion slot 2 from being damaged, in this external fitting step, the housing 30 is eccentrically deviated downward with respect to the insertion slot 2 and the tip of the second locking member 32 disposed below. And a gap between the outer peripheral surface of the insertion slot 2. At this time, by depositing the pusher wheel 3 in the insertion port 2 with the tube axis direction oriented in the horizontal direction, the center of the housing 30 can be positioned below the center of the insertion port 2 by the weight of the pusher wheel 3. In this external fitting process, it is desired that neither the first locking member 31 nor the second locking member 32 damage the outer peripheral surface of the insertion slot 2.

  FIG. 7 shows an example in which the tip of the second locking member 32 before being locked to the outer peripheral surface of the insertion slot 2 is covered with the sheet material 5. The sheet material 5 is provided only on the second locking member 32 of the first locking member 31 and the second locking member 32, and is disposed so as to close the opening of the accommodation groove 33. In the external fitting process, by covering the tip of the second locking member 32 with the sheet material 5 in this way, it is possible to more reliably prevent the tip from damaging the outer peripheral surface of the insertion slot 2. However, the use of the sheet material 5 is not essential. The sheet material 5 is preferably made of a soft material having weather resistance.

  In the sealing process shown in FIG. 6, the fastener 36 is attached to the flange portion 1 b and the housing 30, and then the pusher wheel 3 is moved toward the receiving port 1 by operating the fastener 36 to press the sealing material 4. To do. By mounting the fastener 36, the receiving port 1 and the pusher wheel 3 are centered, and the centering is also performed on the insertion port 2 inserted in the receiving port 1. As a result, the tip of the second locking member 32 protruding from the housing groove 33 is locked to the outer peripheral surface of the insertion slot 2. When the sheet material 5 is used, the sheet material 5 is cut at the tip of the second locking member 32 when the second locking member 32 is locked.

  As shown in FIGS. 2 and 3, in the locking step, the first locking member 31 is pressed by the push bolt 34, and the tip of the first locking member 31 is locked to the outer peripheral surface of the insertion opening 2. Since the leading ends of the first locking member 31 and the second locking member 32 project in a claw shape, they act to bite into the outer peripheral surface of the insertion slot 2 when pressed strongly. The operation of the push bolt 34 is sufficient only in the upper part where the first locking member 31 is arranged, and is unnecessary in the lower part where the second locking member 32 is arranged. Therefore, the work is simplified as compared with the prior art, and it is particularly useful for construction in the excavation groove.

  The push ring shown in FIG. 8 has the same configuration as the push ring 3 described above except that the number of locking members and push bolts is different. In the example of (a), the total number of the plurality of locking members is 4, of which 3 are the first locking members and the remaining one is the second locking member. In the example of (b), the total number of the plurality of locking members is 6, of which 5 are the first locking members and the remaining one is the second locking members. In the example of (c), the total number of the plurality of locking members is 6, of which 4 are first locking members and the remaining 2 are second locking members.

  As in these examples, the total number of the plurality of locking members including the first locking member and the second locking member is preferably 4 or more, and one or two of them is the second locking member. . Thereby, the ratio of a 2nd latching member is moderately suppressed, and the contact balance of each latching member with respect to the outer peripheral surface of an insertion port becomes favorable. That is, as the number of the second locking members increases, it becomes difficult for the tips of the locking members to come into contact with each other in a well-balanced manner. Further, when there are a plurality of second locking members, it is preferable that they are arranged adjacent to each other.

Embodiment of the present invention
Since the embodiment of the present invention can be configured in the same manner as the above-described reference embodiment except for the configuration described below, common points will be omitted and differences will be mainly described. That is, the embodiment of the present invention applies the configuration in which the second locking member can change the posture between the uniform posture and the inclined posture in the above-described reference embodiment, and the configuration and method described in the reference embodiment. Any of these may be provided by embodiments of the present invention. In addition, the same code | symbol is attached | subjected to the member same as the member demonstrated by the reference form, and the overlapping description is abbreviate | omitted.

  In the reference form, the outer fitting process is performed in a state where the protrusion of the tip end of the second locking member 32 is uniform along the circumferential direction as shown in FIG. Such protrusion of the distal end of the second locking member 32 further reduces the gap between the small housing 30 and the insertion slot 2, and the distal end of the second locking member 32 interferes with the outer peripheral surface of the insertion slot 2. It becomes easy to do. For this reason, there is a possibility that the second locking member 32 may damage the outer peripheral surface of the insertion slot 2, and the workability at the time of mounting may be deteriorated. In the example of FIG. 4, although there is room in the upper and lower sides of the internal space of the housing 30, there is no room in the left and right, and the outer peripheral surface of the insertion slot 2 is damaged by the tip of the second locking member 32 positioned on the left and right. Is concerned.

  Therefore, in the present embodiment, the second locking member 32 is in a state where the tip protrudes from the housing groove 33, and the uniform posture in which the protrusion at the tip is uniform along the circumferential direction, and the protrusion at the tip is the circumference. It is made to hold | maintain in the accommodation groove | channel 33 so that an attitude | position can be changed between the inclination attitude | positions which become small along a direction. FIG. 9 shows a longitudinal section of the housing 30, wherein the second locking member 32 in (a) is in an equal posture, and the second locking member 32 in (b) is in an inclined posture. 1 is also referred to for the uniform posture, and FIG. 10 is also referred to for the inclined posture.

  In the external fitting process, as shown in FIG. 10, the front end of the first locking member 31 does not protrude from the receiving groove 33, the second locking member 32 is inclined, and the housing 30 is then attached to the insertion slot 2. Fit. Thereby, it is possible to avoid deterioration in workability due to the protrusion of the tip of the second locking member 32. In the locking step, the first locking member 31 moved toward the insertion port 2 by the operation of the push bolt 34 and the second locking member 32 in the uniform posture are respectively provided on the outer peripheral surface of the insertion port 2. Lock (see FIG. 1). The second locking member 32 in a uniform posture can lock the tip evenly with respect to the outer peripheral surface of the insertion slot 2.

  In the external fitting process of the present embodiment, the second locking member 32 is disposed below while the first locking member 31 is disposed upward, and the second locking member is formed so that the protrusion at the tip becomes smaller upward. The housing 30, which is inclined downward with respect to the insertion slot 2, is externally fitted to the insertion slot 2. By setting the second locking member 32 in an inclined posture, there is a margin in the left and right gaps, and a sufficient space for inserting the insertion slot 2 is formed above the interior of the housing 30. Thus, the housing 30 eccentric in the downward direction can be easily fitted to the insertion slot 2.

  In the present embodiment, the first locking members 31 are disposed only on the half circumference (upper half circumference) of the housing 30, and two or three (two in this embodiment) are provided on the remaining half circumference (lower half circumference) of the housing 30. A second locking member 32 is arranged. Thereby, operation of the push bolt 34 can be made unnecessary in the half circumference of the housing 30. In addition, since the number of the second locking members 32 is moderately suppressed, the contact balance of each locking member with respect to the outer peripheral surface of the insertion opening 2 becomes good. In the case where there are two second locking members 32, it is preferable that both of them are inclined, and in the case where there are three second locking members 32, at least one pair of both ends is in an inclined posture.

  In the process from the state shown in FIG. 10 to the state shown in FIG. 1 after the locking step, the push ring 3 is centered with respect to the receiving port 1 by the operation of the fastener 36, and the insertion port 2 is operated by the operation of the pressing bolt 34. The first locking member 31 is moved. As a result, the housing 30 is centered with respect to the insertion slot 2, and the outer peripheral surface of the insertion slot 2 presses against the tip of the second locking member 32. As a result, the second locking member 32 changes its posture so that its tip is along the outer peripheral surface of the insertion slot 2, and changes from the inclined posture to the uniform posture.

  As described above, it is preferable to change the second locking member 32 from the inclined posture to the uniform posture by the action of the outer peripheral surface of the insertion port 2 pressing against the tip of the second locking member 32. Thereby, even if it does not perform a special operation | work, the attitude | position of the 2nd latching member 32 can be changed via the insertion slot 2, and work can be simplified. Since the second locking member 32 is only held in the receiving groove 33 via the elastic member 6, the posture can be easily changed according to the action received from the insertion slot 2 as described above.

  Further, as in the present embodiment, when the housing 30 is decentered downward with respect to the insertion slot 2 and is externally fitted, the push bolt 34 is operated to move the first locking member 31 toward the insertion slot 2. First, as shown in FIG. 11A, one of the upper ends of the first locking member 31 is in contact with the outer peripheral surface of the insertion slot 2 prior to the other end. To do. In this state, a gap is formed between the other end and the outer peripheral surface of the insertion slot 2. The center C30 of the housing 30 is located below the center C2 of the insertion slot 2.

  When the first locking member 31 is continuously moved toward the insertion slot 2, as shown in FIG. 11 (b), the first locking member is set with one end portion contacting the outer peripheral surface of the insertion slot 2 as a fulcrum. 31 rotates (clockwise in FIG. 11), and both end portions of the front end of the first locking member 31 come into contact with the outer peripheral surface of the insertion slot 2. When the first locking member 31 is further moved and the housing 30 is centered with respect to the insertion slot 2, the center C30 of the housing 30 coincides with the center C2 of the insertion slot 2 as shown in FIG. The first locking member 31 uniformly locks the tip with respect to the outer peripheral surface of the insertion slot 2. For this state, reference is also made to FIG.

  The pusher wheel 3 having the non-divided housing 30 is generally used for a pipe P2 (for example, a pipe having nominal diameters of φ75, φ100, and φ150) having a relatively small outer diameter of the insertion opening 2 and has four to six engagements. A member is provided. In such a push wheel 3, the curvature of the tip of each locking member is relatively large. Therefore, the problem that the workability at the time of mounting is deteriorated due to the protrusion of the tip of the second locking member 32 is remarkable. It becomes more useful.

  When the total number of the locking members is 4, the opening angle θ1 of the second locking member 32 is preferably 95 to 100 degrees. When the total number of the locking members is 6, the opening angle θ1 is preferably 65 to 70 degrees. As shown in FIG. 9A, the opening angle θ <b> 1 is a pair of straight lines that connect both end portions of the tip end of the second locking member 32 and the center O of the circle along the tip end of the second locking member 32. Is the angle formed by With this configuration, the contact area with the outer peripheral surface of the insertion opening 2 can be increased to enhance the separation preventing function, but on the other hand, the workability during mounting deteriorates due to the protrusion of the tip of the second locking member 32. Becomes prominent. Therefore, the method described above is more useful.

  The center line CL1 corresponds to a normal passing through the center of the arc along the tip of the second locking member 32 in the uniform posture, and is also a bisector of the opening angle θ1. The center line CL2 corresponds to a normal passing through the center of the arc along the tip of the second locking member 32 in the inclined posture. The second locking member 32 tilts between the uniform posture and the inclined posture, and the angle θ2 formed by the center line CL1 and the center line CL2 is preferably 1 degree or more, more preferably 2 degrees or more. Further, the angle θ2 is preferably 4 degrees or less, and more preferably 3 degrees or less. If this exceeds 4 degrees, the protrusion at the tip of the second locking member 32 becomes too small in part, which may affect the locking action. Further, the protrusion at the other end becomes large, and the second locking member 32 may interfere with the insertion slot 2 and be damaged when the presser wheel 3 is externally fitted to the insertion slot 2.

  In the inclined posture, the protrusion of the tip of the second locking member 32 becomes smaller along the circumferential direction, and the protrusion amount of one end (upper end in FIG. 9) is the other end (lower in FIG. 9). Is smaller than the amount of protrusion at the end of One of the ends can be sunk (not projected) in the receiving groove 33, but is preferably projected as shown. That is, it is preferable that the second locking member 32 in the inclined posture protrudes at both ends at the tip. Accordingly, the protrusion at the other end is prevented from becoming too large, and deterioration of workability can be prevented.

  In the present embodiment, the housing groove 33 has a first inner surface portion 33a that is in surface contact with the central outer surface 32a of the second locking member 32 in the uniform posture, and an outer surface of the end portion of the second locking member 32 in the uniform posture. There is provided a second inner surface portion 33b that does not contact 32b and contacts the outer surface 32b of the end portion of the second locking member 32 in an inclined posture. The center outer surface 32a is the outer surface of the center of the second locking member 32 in the circumferential direction, and the end outer surface 32b is the outer surface of the end. According to such a configuration, it is possible to realize a structure in which the second locking member 32 can change the posture between the uniform posture and the inclined posture by simple modification of the housing groove 33.

  In the external fitting process, the second locking member 32 in the receiving groove 33 can be easily set by tilting the second locking member 32 so that the end outer surface 32b contacts the second inner surface portion 33b. Can be tilted. In the present embodiment, since the end outer surface 32b and the second inner surface portion 33b are in surface contact, the posture of the second locking member 32 can be easily stabilized. Moreover, in this embodiment, the 1st inner surface part 33a and the 2nd inner surface part 33b are each formed in the bottom face of the accommodation groove | channel 33, and the center part outer surface 32a is slightly with respect to the 1st inner surface part 33a in the inclination attitude | position. It will be in a state inclined to.

  In the locking step, as described above, the second locking member 32 pressed against the outer peripheral surface of the insertion slot 2 changes its posture so that its tip is aligned with the outer peripheral surface of the insertion slot 2, and from the inclined position Change to a uniform posture. At that time, as shown in FIG. 9B, the central outer surface 32a comes into surface contact with the first inner surface portion 33a, whereby the posture of the second locking member 32 is determined. In the present embodiment, the first inner surface portion 33 a is provided substantially perpendicular to the radial direction of the housing 30, and the load acting on the second locking member 32 in the uniform posture is in contact with the central outer surface 32 a. It supports by the 1st inner surface part 33a which contacts.

  In the uniform posture, as shown in FIG. 9A, the end outer surface 32b is separated from the second inner surface portion 33b and does not come into contact. In the present embodiment, the shape of the accommodation groove 33 at the location where the second locking member 32 is disposed is asymmetric with respect to the center line CL1. Specifically, the depth D1 of the accommodation groove 33 in the second inner surface portion 33b is set to be larger than the depth D2 of the accommodation groove 33 at a position equidistant from the center line CL1, and (D1-D2) is 2 mm, for example. It is. As described above, the accommodation groove 33 is provided with a clearance for the second locking member 32 to be inclined.

  The push wheel shown in FIG. 12 has the same configuration as the push wheel 3 described above except for the structure related to the locking member and the push bolt. In these push wheels, through holes extending in the tube axis direction are formed at a plurality of locations (six locations in the present embodiment) in the tube circumferential direction on the outer peripheral surface of the housing, and a plurality of locking members are provided. The total number is less than the number of through holes. Further, the locking member and the locking member adjacent to the locking member are arranged so that their tips overlap each other in the tube axis direction.

  In the example of (a), the number of locking members is different between the half circumference (upper half circumference) and the remaining half circumference (lower half circumference) of the housing, and the lengths of the first locking member and the second locking member are also different. Yes. The number of through-holes is six, and originally, it has a structure in which six locking members are arranged, but the number of parts is reduced compared to the conventional case by using a second locking member that is long in the circumferential direction. is made of. In the example of (b), in the structure of (a), the first locking member disposed on the upper half circumference is also formed long in order to further reduce the number of parts. Moreover, the attachment hole is provided near the through-hole to which a fastener is mounted | worn so that the center part of a 1st latching member can be pressed with a push bolt. In this configuration, since the lengths of the respective locking members are uniform, the load balance is better than that of the structure (a). In the example of (c), the structure of (b) is further modified, and two push bolts are provided for one first locking member. Compared to the structure of (b) above, the cost reduction effect is inferior, but the strength is excellent because there are many places supporting the load.

  Also in the press wheel shown in FIG. 8 and FIG. 12, the above-described advantageous effects can be obtained by configuring the second locking member so that the posture of the second locking member can be changed between the uniform posture and the inclined posture. It is done.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention. The number of locking members and push bolts are used and conditions for use. It can be changed appropriately according to the situation.

  In the above-described embodiment, the example in which the fluid pipe detachment prevention device is applied to the push wheel has been described. However, the present invention is not limited to this, and can be applied to, for example, a slip-on type pipe joint. In this case, the housing is made of a non-divided annular body formed integrally with the receiving port, and a plurality of locking members are accommodated in an accommodation groove formed on the inner peripheral surface thereof.

1 Receiving port 2 Inserting port 3 Press wheel (an example of a separation prevention device)
4 Seal material 5 Sheet material 6 Elastic material 30 Housing 31 First locking member 32 Second locking member 32a Center outer surface 32b End outer surface 33 Housing groove 33a First inner surface portion 33b Second inner surface portion 34 Press member)
35 Through-hole 36 Fastener P1 Pipe P2 Pipe

Claims (9)

An external fitting step of inserting an insertion port of the other tube into the receiving port of one tube and externally fitting a housing made of a non-divided annular body formed separately from or integrally with the receiving port to the insertion port. When,
A locking step of locking a plurality of locking members housed in a housing groove that opens toward the outer circumferential surface of the insertion port to the outer circumferential surface of the insertion port; ,
The plurality of locking members include a first locking member provided with a pressing member inserted through the mounting hole of the housing and a second locking member not provided with the pressing member,
The second locking member has a uniform posture in which the protrusion at the tip is uniform along the circumferential direction in a state where the tip is protruded from the receiving groove, and an inclination at which the protrusion at the tip becomes small along the circumferential direction It is held in the housing groove so that the posture can be changed between postures,
In the external fitting step, the front end of the first locking member does not protrude from the housing groove, and the second locking member is in an inclined posture, and then the housing is externally fitted to the insertion opening,
In the locking step, the first locking member moved toward the insertion port by the operation of the pressing member and the second locking member in an equal posture are respectively engaged with the outer peripheral surface of the insertion port. A method of mounting a fluid pipe detachment prevention device, characterized by stopping the fluid pipe.   In the external fitting step, the second locking member is disposed below while the first locking member is disposed upward, and the second locking member is inclined so that the protrusion at the tip becomes smaller upward. The mounting method of the apparatus for preventing fluid pipe detachment according to claim 1, wherein the housing is externally fitted to the insertion opening in a posture and is eccentric downward with respect to the insertion opening.   3. The fluid pipe detachment preventing device according to claim 2, wherein the first locking member is disposed only in the upper half circumference of the housing, and two or three second locking members are disposed in the lower half circumference of the housing. Wearing method.   The separation of the fluid pipe according to any one of claims 1 to 3, wherein the second locking member is changed from an inclined posture to an equal posture by an action in which an outer peripheral surface of the insertion port presses against a tip of the second locking member. How to install the prevention device. In the fluid pipe detachment preventing device used for the pipe joint formed by inserting the insertion opening of the other pipe into the receiving opening of one pipe,
A housing formed of a non-divided annular body that is formed separately or integrally with the receiving port, and is externally fitted to the insertion port;
A plurality of locking members locked to the outer peripheral surface of the insertion opening;
An accommodation groove that opens toward the outer peripheral surface of the insertion opening and accommodates the plurality of locking members;
A pressing member inserted through the mounting hole of the housing,
The plurality of locking members include a first locking member provided with the pressing member and a second locking member not provided with the pressing member, and the first engagement member is operated by operating the pressing member. The stop member can be moved in the pipe diameter direction,
The second locking member has a uniform posture in which the protrusion at the tip is uniform along the circumferential direction in a state where the tip is protruded from the receiving groove, and an inclination at which the protrusion at the tip becomes small along the circumferential direction The fluid pipe detachment prevention device, wherein the device is held in the housing groove so that the posture can be changed between the postures.   The accommodation groove is not in contact with the first inner surface portion that is in surface contact with the outer surface of the central portion of the second locking member in the uniform posture and the outer surface of the end portion of the second locking member in the uniform posture and is inclined. The fluid pipe detachment preventing device according to claim 5, further comprising a second inner surface portion that contacts an outer surface of the end portion of the second locking member in a posture.   The fluid pipe according to claim 5 or 6, wherein the first locking member is disposed only on a half circumference of the housing, and two or three second locking members are disposed on the remaining half circumference of the housing. Detachment prevention device.   The fluid pipe detachment preventing device according to claim 5 or 6, wherein the total number of the plurality of locking members is 4 or more, and one or two of them is the second locking member.   6. A plurality of through holes extending in the tube axis direction are formed at a plurality of locations in the tube circumferential direction on the outer peripheral surface of the housing, and the total number of the plurality of locking members is smaller than the number of the through holes. The fluid pipe detachment preventing device according to any one of claims 8 to 9.

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