JP2011085263A - Connecting fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting fitting preventing an incomplete connection between joint sections and a "galling phenomenon" between the joint section and a liner section, in the connecting fitting constituted from a pair of connecting fitting bodies with an identical structure without distinction between male and female. <P>SOLUTION: One or both of the connecting fitting bodies include: the liner section provided with a seal surface and an attachment to a hose or a pipe element; the joint section having a plurality of fitting projections and fitting recesses, and rotatably fit onto the outside of the liner section. Letting J denote the minimum inner diameter of the contact surface portion on the joint section which comes into contact in the axial direction to regulate the liner section which has fit into the joint section, L the maximum diameter of the liner section, and G the outer diameter of the liner section, the relations between these values and the axial length l of the portion on the liner section with the outer diameter G are L>J and l<√(N<SP>2</SP>-G<SP>2</SP>). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pair of fittings having the same structure without distinction between males and females for connecting hoses such as fire fighting hoses to each other, connecting pipes of liquid transport pipes, or connecting pipes and piping elements of other equipment. About.

  In general, there are plug-in fittings for hoses such as fire fighting hoses, and such plug-in fittings have a structure in which a pair of coupling fitting bodies are engaged and locked together in the axial direction. is there. Such a plug-in type fitting is defined in, for example, Japanese Industrial Standard JIS B 9911, and such a fitting is generally called a “machino-type fitting”.

  Such a plug-in type fitting can be coupled and released with a simple device, and has desirable characteristics as a fitting for fire fighting hoses, which requires quick and reliable operation.

  However, the conventional plug-type fittings have a male / female distinction between the pair of fittings to be joined. One is a male fitting and the other is a female fitting. Can not. For this reason, for example, during fire extinguishing work, when extending a plurality of fire hoses and joining them together, there is a possibility that the fire hoses may be extended so that the male fittings or the female fittings correspond to each other. It is preferable to eliminate such a possibility from the viewpoint of speed of operation and certainty. In addition, the conventional coupling metal has to be manufactured with two types of metal fittings, ie, a male fitting and a female fitting, which have different structures.

  Accordingly, the present applicant has developed a coupling metal fitting composed of a pair of coupling metal bodies having the same structure without distinction between males and females, which has solved the problem of the insertion-type coupling metal fitting as described above, for example, Japanese Patent No. 3107507. It is registered as.

  Hereinafter, the structure of the above-described fitting will be described with reference to FIGS. This coupling metal fitting is applied to a fire hose coupling metal fitting. The coupling fitting is composed of a pair of coupling fitting bodies 1a and 1b having the same structure, and fire hose 2a and 2b are connected to the coupling fitting bodies 1a and 1b, respectively.

  These coupling metal bodies 1a and 1b are each provided with a cylindrical body 3, which has a substantially cylindrical shape, and a hose attachment portion 4 having serrated irregularities is formed on the inner peripheral surface thereof. Yes. And the edge part of fire hose 2a, 2b is inserted in this hose attachment part 4, The outer peripheral surface of this hose is pressed against this hose attachment part 4 by the crimping ring (not shown) from the internal peripheral surface of these hoses. Install this fire hose.

  A cylindrical sealing surface member 5 is screwed on the inner peripheral surface of the front end portion of the cylinder body 3, and the front end surface of the sealing surface member 5 is formed as a sealing surface. A sealing member 6 such as is attached. Therefore, when the coupling metal bodies 1a and 1b are fitted and coupled to each other in the axial direction, the seal members 6 are abutted with each other to communicate with the inside of the cylindrical body 3 and have a sealing property. To maintain.

  A plurality of, for example, six fitting projections 8 are integrally projected at the front end of the cylinder body 3. These fitting protrusions 8 are arranged at equal intervals in the circumferential direction, and protrude in the axial direction with respect to the seal surface of the seal surface member 5. Further, a space between these fitting protrusions 8 is formed as a fitting recess 7. When these fitting metal bodies 1a and 1b are abutted in the axial direction, one fitting metal body 1a The fitting protrusion 8 fits in the fitting recess 7 of the other coupling metal body 1b, and the fitting protrusion 8 of the other coupling metal body 1b fits in the fitting recess 7 of the one coupling metal body 1a. Mates and fits in a complementary fashion.

  In this case, the width of the fitting recess 7 is slightly wider than the width of the fitting protrusion 8. Accordingly, the fitting protrusions 8 are fitted in the fitting recesses 7 in the axial direction and are also rotatable by a predetermined amount in the circumferential direction.

  Further, a stepped hook-like locking hook 9 is formed on one side surface 8a of the fitting protrusion 8, respectively, and these are engaged with the locking hook of the mating protrusion on the other side and the circumferential direction. It is comprised so that it may engage with. Therefore, in a state where these fitting projections 8 are fitted in the mating fitting recesses 7 in the axial direction, the coupling metal bodies 1a and 1b are rotated with respect to each other, and one of the fitting projections 8 is When the side surfaces 8a are close to each other, these locking hooks 9 are engaged with each other and locked in the axial direction as shown in FIG. 3, and the coupling metal bodies 1a and 1b are coupled to each other. Note that. A bent portion 11 for preventing stress concentration at this portion is formed at the base portion of the locking collar portion 9. Further, the leading end corners of the other side surfaces of these fitting protrusions are formed in an arc shape to form a guide portion 12, and when these are fitted, these guide portions 12 come into contact with each other. .

  Further, the locking surfaces of these locking collars 9 are inclined in an overhanging manner by a predetermined angle with respect to the circumferential direction, and these coupling metal bodies 1a are caused by internal water pressure or the like in a state where they are fitted. , 1b, when a load acting in a direction separating them from each other is applied, a rotational force is generated in a direction in which the side surfaces 8a are pressed against each other, so that these locking hooks 9 are fitted more strongly, and the coupling metal bodies 1a, 1b It is configured to surely prevent the omission or the like.

  In this embodiment, in the state in which the locking collar portion 9 is fitted, each part is so formed that a gap is formed between the distal end surface of the fitting projection 8 and the back wall surface of the fitting recess 7. The dimensions are set. Therefore, this thing can move so that these fitting protrusions 8 and fitting recesses 7 may further enter each other in the axial direction from the state in which the locking collar 9 is engaged.

  Moreover, the other side surface 8b of these fitting protrusions 8 is inclined with respect to the axial direction of these coupling metal bodies 1a and 1b. Accordingly, the fitting protrusion 8 is formed in a taper shape such that the circumferential width thereof becomes narrower as it goes to the tip, and the fitting recess 7 similarly has its circumferential width as it goes to the inner part. Is formed in a taper shape such that becomes narrower. Thereby, fitting of these fitting protrusions 8 and fitting recesses 7 becomes easy. Note that one side surface on which the locking collar portion 9 is formed is formed substantially parallel to the axial direction of the coupling metal bodies 1a and 1b.

  Further, an urging mechanism 10 is provided on each of the other side surfaces 8b of the fitting protrusions 8. These urging mechanisms 10 are constituted by urging members, for example, steel balls 15, which are slidably accommodated in a cylindrical case member 14, and springs 16 which urge the steel balls 15 in the protruding direction. These urging mechanisms 10 are embedded in the other side surfaces of the fitting projections 8. Therefore, when these fitting projections 8 are fitted into the mating fitting recesses 7 as shown in FIG. 10, the steel balls 15 come into contact with each other and are pressed against each other. The other side surfaces of the portion 8 are urged away from each other. As a result, one side surface 8a of the fitting projection 8 is urged so as to be close to each other. The locking hooks 9 are biased so as to engage with each other.

  Further, a plurality of tool grooves 20 are formed on the outer peripheral surfaces of these coupling metal bodies 1a and 1b. These tool grooves 20 are formed in a shape that can be fitted with a tool such as a wrench, for example, and in the unlikely event that the coupling of these coupling metal bodies 1a and 1b cannot be released due to the engagement of sand or the like. Can be released by fitting a tool such as a wrench into these tool grooves 20 and forcibly turning the coupling metal bodies 1a and 1b.

  By the way, in such a coupling metal fitting, the fitting protrusion 8 and the fitting recess are fitted in the axial direction, and the locking hooks 9 are engaged with each other in the circumferential direction. When a positive water pressure or the like is applied in the coupling metal, a large axial load acting on these coupling metal bodies is applied to the coupling metal body, and this load is applied to the engagement hook portion 9. Supported by a match. For this reason, when the pressure is acting on the inside, the coupling of the coupling metal is not undesirably released.

  However, when this coupling fitting is used, for example, as a hose on the suction side of a fire engine, that is, a suction pipe joint, a negative pressure naturally acts. When negative pressure is applied in this way, an axial load is applied such that these coupling metal bodies are close to each other. Therefore, the seal member 6 and the urging mechanism 10 are further pressed by this load, and the coupling metal bodies 1a and 1b move relatively in the axial direction so as to be closer to each other. For this reason, the locking collars 9 of the fitting protrusions 8 are separated from each other, and their engagement is released.

  In this state, when the external load does not act, these coupling metal bodies are not separated. However, for example, if a twist in the release direction acts on the suction pipe connected to one coupling metal body, The coupling metal body may rotate in the releasing direction, and the coupling metal body may be undesirably separated.

  In addition, the above-described problem may occur even when negative pressure is not acting. That is, the suction pipe as described above has a high rigidity to withstand negative pressure, and a strong twist may occur when handling such a suction pipe. The coupling metal body may rotate against the urging force, and the engagement of these coupling metal bodies may be undesirably released and separated. Such a malfunction is not limited to the suction pipe of a fire engine, and may generally occur when a highly rigid hose or the like is attached to the fitting.

  Therefore, the present applicant pays attention to the above-described problems, and there is no distinction between males and females. Japanese Patent Application No. 2000-225639 has been filed for a hose fitting that does not undesirably come off due to a torsional load or the like.

Japanese Patent Application No. 2000-225639

  However, when the coupling metal fitting shown in Japanese Patent Application No. 2000-225639 is used for, for example, a pipe for a food plant, a joint part having a liner part into which packing is inserted and a locking hook part fitted to the outside is provided. Separated and rotatable. In addition, there is a need to manufacture the fitting with a material with poor slipperiness such as stainless steel.If this is used repeatedly after degreasing, cleaning, disinfection, etc., the liner part and the joint part will cause a `` galling phenomenon '' at the time of attachment / detachment. It may happen.

  The present invention has been made paying attention to the above circumstances, and the object of the present invention is not to distinguish between males and females. It is an object of the present invention to provide a coupling fitting that can prevent complete coupling and a “galling phenomenon” between a joint portion and a liner portion.

In order to achieve the above object, claim 1 is a coupling metal fitting for connecting hoses to each other or to a piping element of another device, a pair of cylindrical coupling metal bodies, and these coupling metal bodies. A sealing surface formed on the front end surface of the coupling metal and axially abutting each other, a plurality of fitting protrusions arranged in a circumferential direction around the sealing surface from the coupling fitting body and protruding in the axial direction, and these fittings A fitting recess formed between the mating projections, and the fitting projection and the fitting recess of the pair of coupling metal bodies are pivoted to the fitting recess and the fitting projection of the mating coupling metal body on the other side. The fitting protrusions are circumferentially locked to the fitting protrusions of the mating fitting body on the other side to restrict the movement in the axial direction. In what is formed with a locking collar portion to be locked to
At least one of the coupling metal bodies has a liner portion including the seal surface and an attachment portion for the hose or the piping element, the plurality of fitting protrusions and fitting recesses, and an outer side of the liner portion. And a joint portion that is rotatably fitted to the
The minimum inner diameter of the abutting surface portion of the joint portion that regulates by abutting the liner portion fitted to the joint portion in the axial direction is J.
The maximum diameter of the liner is L
Outer diameter G of the liner part
In this case, these values and the length l in the axial direction of the outer diameter G portion of the liner portion have the following relationship.
L> Jl <√ (N ² −G ² )
According to a second aspect of the present invention, in the coupling fitting according to the first aspect, the joint portion is attached to the liner portion so as to be rotatable and movable in a predetermined range in the axial direction. To do.

According to the above configuration, since the joint portion is rotatable with respect to the liner portion, even if a twist occurs on the hose side, the twist acts only on the liner portion and does not act on the joint portion. Therefore, the fitting of the joint portion is not undesirably released.
Even when negative pressure is not applied, the twist generated on the hose side acts only on the liner part, and even if this liner part rotates, the joint part does not rotate. Is not undesirably released.
Further, by setting the axial length of the outer diameter portion of the liner portion to be smaller than √ (N ² −G ² ), it is possible to prevent the galling phenomenon with the inner peripheral surface of the joint portion.

The side view which shows a part of coupling | bonding metal fitting of the 1st Embodiment of this invention in a cross section. The side view which shows a part of fitting state of the coupling metal fitting of the embodiment in a cross section. The side view which shows a part of state in which the negative pressure of the coupling metal fitting of the embodiment acted on a cross section. The joint part of the embodiment is shown, (a) is a side view, (b) is a front view, (c) is a longitudinal side view, and (d) is an enlarged view of an X part. The embodiment shows a liner part, (a) is a side view in which a part is cut, (b) is a front view, (c) is a sectional view in which A part is enlarged, (d) is a sectional view of a seal member, (E) is an enlarged view of a Y portion. The same embodiment is shown, (a) is a front view when the joint part and the liner part are fitted and are eccentric in the radial direction, and (b) is the axis of the liner part with respect to the axis of the joint part. Fig. 3 is a vertical side view of the tilted state. The same embodiment is shown, (a) is an enlarged view showing a part of the joint state of the joint portion, (b) is a view at the moment of separation of the joint portion. The perspective view of the complementary coupling metal fitting without a sex distinction. The side view which shows the one coupling metal fitting main body of the coupling metal fitting of FIG. 8 in a cross section. The top view of the fitting state of the fitting protrusion of the coupling metal fitting of FIG. 8, and a fitting recessed part.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, the coupling fitting of the present invention is applied to a food plant piping. The coupling fitting is composed of a pair of coupling fitting main bodies 31a and 31b, and the coupling fitting main body 31a is attached and fixed to, for example, a suction port 33 formed in a seat plate 32 of the pump. Further, the other coupling metal body 31 b is attached to the pipe 34.

  The coupling metal bodies 31a and 31b are composed of liner portions 35a and 35b and joint portions 34a and 34b, respectively. The joint portions 34a and 34b are ring-shaped members, and are formed with complementary fitting projections 8 and fitting recesses 7 respectively, and locking collars 9 are formed on the side surfaces of the fitting projections 8. Further, an urging mechanism 10 is provided. The fitting projection 8, the fitting recess 7, the locking collar 9, the urging mechanism 10, etc. are shown in FIGS. The structure is the same as that of the fitting, and the corresponding parts in the figure are given the same reference numerals and the description thereof is omitted.

  In this embodiment, one coupling fitting body 31a is attached to a pump inlet or the like, and the other coupling fitting body 31b is attached to a pipe 34. Therefore, the liner portions 35a and 35b of these coupling metal bodies 31a and 31b have basically the same configuration, but their configurations are slightly different depending on the members to be attached.

  That is, the liner portion 35a of one coupling metal body 31a is attached to the pump suction port 33 by a screw portion 36, and this screw portion 36 is fixed by an adhesive after being attached and is fixed so as not to rotate. . Further, the joint portion 34a of the one coupling metal body 31a is fixed to the liner portion 35a by the screw portion 37 and then fixed with an adhesive, and is fixed to the liner portion 35a so as not to rotate.

  Further, the liner portion 35b of the other coupling metal body 31b is extended at the rear end portion thereof, and a hose attachment portion 47 for attaching the liquid transport hose 48 is formed. The hose attachment portion 47 has a plurality of protrusions 49 for preventing slippage on the outer periphery thereof, and is a portion usually referred to as “bamboo shoot”. A liquid transport hose 48 is fitted to the outer periphery of the hose attachment 47 and is fastened and fixed by a fastening ring 50 from above.

  In the other coupling metal body 31b, the joint portion 34b is attached to the liner portion 35b so as to be rotatable and movable in the axial direction. That is, a fitting hole 51 is formed in the joint part 34b, and the fitting hole 51 is fitted to the outer periphery of the liner part 35b so as to be rotatable and slidable in the axial direction. And this joint part 34b is axial direction only a predetermined distance between the seal flange part 42 formed in the front edge part of the liner part 35b, and the stop ring 41 with which the outer peripheral surface of this liner part 35b was mounted | worn. It is restricted to move freely.

  An annular groove 42a is provided inside a seal flange portion 42 provided at the front end of the liner portions 35a and 35b, and a seal member 43 is attached to each of the annular grooves 42a. The seal members 43 are in contact with each other and perform a sealing action when the coupling metal bodies 31a and 31b are fitted. In this embodiment, since the negative pressure is also considered, the seal member 43 is configured to surely perform the sealing action even when the negative pressure is applied.

  Next, the joint part 34a (34b) and the liner part 35a (35b) will be described in detail with reference to FIGS. FIG. 4 shows a joint part, (a) is a side view, (b) is a front view, (c) is a longitudinal side view, FIG. 5 shows a liner part, (a) is a side view with a partial cross section, (B) is a front view, (c) is an enlarged cross-sectional view of part A, (d) is a cross-sectional view of the seal member, and FIG. FIG. 5B is a front view when the shaft is eccentric, and FIG. 5B is a vertical side view of the liner with the axis of the liner inclined with respect to the axis of the joint.

The joint portion 34a and the liner portion 35a are configured as shown in FIGS. That is, the outer diameter of the joint portion 34a is D, the inner diameter of the joint portion 34a to which the liner portion 35a is fitted is N, the outer diameter of the liner portion 35a to be fitted to the joint portion 34a is G, and the joint portion 34a is When the rotation angle of the gap when the locking collar portion 9 is separated is β, and the liner portion 35a is fitted to the joint portion 34a and eccentrically in the radial direction, the outer peripheral surface of the liner portion 35a and the joint portion 34a Assuming that the gap formed between the peripheral surface and S is such a value and the gap S,
NG = S
S <(πNβ / 360 °). Since S ′ in FIG. 6A is the length of the string, it is strictly Nsin (β / 2). However, if β is 5 ° or less, there is no difference of 0.1% from the arc length πNβ / 360 °, so this simple equation can be used instead.

Further, the minimum inner diameter of the contact surface 34x portion of the joint portion 34a for restricting the liner portion 35a fitted with the joint portion 34a by contacting in the axial direction is J, the maximum diameter of the liner portion 35a is L, and the outside of the liner portion 35a. When the diameter is G, these values and the axial length l (small L) of the outer diameter G portion of the liner portion 35a are L> J.
The relationship is l <√ (N ² −G ² ).

  Therefore, as shown in FIG. 7A, when the joint portions 34a and 34b are in the coupled state, the fitting projection 8 is fitted into the mating fitting recess 7, and the steel ball 15 is They are in contact with each other and urged against each other, and the other side surfaces of these fitting projections 8 are urged away from each other. As a result, one of the side surfaces 8a of the fitting protrusions 8 is urged so as to be close to each other, and as described above, the locking collars 9 on these one side surfaces are urged to engage with each other. Yes. At this time, a coupling gap α is formed between the side surfaces 8b of the fitting protrusions 8, and this coupling gap α is a rotation angle between the joint portions 34a and 34b.

  From this state, the joint portions 34a and 34b are rotated in the circumferential direction against the urging force of the steel ball 15 around the axis, and the side surfaces 8b of the fitting protrusions 8 have a gap β between them. As shown in FIG. 7 (b), the ball 15 is immersed in the case member 14, and the engagement state between all the locking collar portions 9 provided in the circumferential direction is released, and the joint portions 34a and 34b are released. And are withdrawn.

In this way, when the liner portion 35a is fitted to the joint portion 34a and is eccentric in the radial direction, the gap S formed between the outer peripheral surface of the liner portion 35a and the inner peripheral surface of the joint portion 34a is πNβ / By setting the angle smaller than 360 °, it is possible to prevent incomplete coupling (some of the plurality of locking hooks are coupled, and some are in a state intermediate between separation and disengagement). Furthermore, by setting the axial length l of the outer diameter portion of the liner portion 35a to be smaller than √ (N ² −G ² ), even if the liner portion 35a is inclined with respect to the axis of the joint portion 34a, the joint The galling phenomenon with the inner peripheral surface of the portion 34a can be prevented. However, considering the occurrence of distortion during welding of the liner portion to the pipe, the above value is not necessarily small, and is preferably as close as possible to the value shown in the above calculation formula.

  Further, in the present invention, the above-described fittings for liquid transport pipes can be applied to hose fittings in general for civil engineering and flood control, ships, oil plants, unloading equipment, food industry, other plants, and the like.

  Furthermore, the coupling fitting of the present invention is not limited to one formed of a metal material, and may be formed of a synthetic resin, various composite materials, or other materials, and any one kind or plural kinds of materials May be formed.

As described above, according to the present invention, by setting the axial length of the outer diameter portion of the liner portion to be smaller than √ (N ² −G ² ), the galling phenomenon with the inner peripheral surface of the joint portion. There is an effect that can be prevented. Further, by setting the gap formed between the outer peripheral surface of the liner portion and the inner peripheral surface of the joint portion to be smaller than πNβ / 360 °, incomplete coupling (intermediate between coupling and separation) can be prevented.

7 ... fitting recess 8 ... fitting protrusion 9 ... locking collar 10 ... urging mechanism 31a, 31b ... coupling bracket main body 34a, 34b ... joint part 35a, 35b ... liner part

Claims (2)

Coupling fittings that connect hoses to each other or piping elements of other devices, and are formed on a pair of cylindrical coupling fitting bodies and front end surfaces of these coupling fitting bodies, and are axially abutted with each other. A plurality of fitting protrusions that are arranged in the circumferential direction and project in the axial direction around the sealing face from the coupling metal body, and fitting recesses formed between the fitting protrusions. The fitting protrusions and the fitting recesses of the pair of coupling metal bodies are axially fitted to the fitting depressions and the fitting protrusions of the mating coupling metal body, and the fitting protrusions An engagement hook portion is formed that engages the fitting projection of the mating fitting main body on the other side in the circumferential direction to restrict axial movement and locks the pair of coupling fitting main bodies in the axial direction. In things,
At least one of the coupling metal bodies has a liner portion including the seal surface and an attachment portion for the hose or the piping element, the plurality of fitting protrusions and fitting recesses, and an outer side of the liner portion. And a joint portion that is rotatably fitted to the
The minimum inner diameter of the abutting surface portion of the joint portion that regulates by abutting the liner portion fitted to the joint portion in the axial direction is J.
The maximum diameter of the liner is L
Outer diameter G of the liner part
In this case, these values and the length l in the axial direction of the outer diameter G portion of the liner portion have the following relationship.
L> Jl <√ (N ² −G ² )   The joint fitting according to claim 1, wherein the joint portion is attached to the liner portion so as to be rotatable and movable in a predetermined range in the axial direction.

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