JP6915876B2 - Plug-in joint and its receiver - Google Patents

Description

The present invention relates to a plug-in type joint and a receiver thereof, and particularly relates to a joint structure suitable as a fire-fighting joint.

Conventionally, various fire-fighting joints have been used as fire-fighting joints, such as fire-fighting hose joints for connecting fire-fighting hoses, or fire-fighting equipment joints for connecting equipment such as pipe spears. There is. As shown in FIGS. 7 and 8, the plug-in type coupling joint has an inserter 10 and a receiver 20 configured to be detachably attached to each other, and the inserter 10 is internally engaged with the engaging claw 24. Is inserted into the receiving port 20a of the receiving tool 20 which is freely installed so that the locking step portion 11b at the base end of the tip tubular portion 11 of the inserting tool 10 is urged in the direction of protruding inward by the leaf spring 25. By engaging with the engaged claws 24 and preventing the locking step portion 11b from coming off, they are coupled to each other (see, for example, Patent Document 1 below).

Japanese Unexamined Patent Publication No. 2003-185079

However, even in a state where the insertion tool 10 is prevented from coming off by locking the locking step portion 11b to the locking claw 24 as described above, the outer diameter of the tip cylinder portion 11 of the insertion tool 10 and the receiving port of the receiving tool Since there is a slight dimensional difference from the inner diameter of 20a, when a large bending moment is applied to the joint due to water pressure or hose operation, the axis of the insert 10 tilts with respect to the axis of the receiver 20. As a result, the locking step portion 11b of the insert 10 interferes with the locking claw 24, which may cause deformation of the locking claw 24 and the leaf spring 25 for urging the locking claw 24. When such a deformation occurs, the joint may be unintentionally detached after that, or a detachment failure may occur during the detachment operation.

The present invention solves the above problems, and an object of the present invention is a structure of a plug-in joint that can suppress deformation of a locking claw and its urging means even when stress is applied between a fitting and a receiving tool. In particular, it is to provide the structure of the receiver.

In order to solve the above problems, the plug-in type coupling joint of the present invention is configured to accept an insert having a tip cylinder portion having a locking step portion on the axial direction base end side and the tip cylinder portion. In a plug-in joint including a receiver having a socket, the receiver is urged inside the socket in a protruding direction, and in a state where the insert and the receiver are coupled, the locking step portion and the locking step portion are provided. A first locking claw that is configured to be engageable and a first that is provided on the axially proximal side of the locking claw and surrounds the proximal end portion of the tip cylinder portion in the coupled state in such a manner that the position can be regulated. It is composed of an inner peripheral surface portion of the above, a seal space provided on the axially proximal end side of the first inner peripheral surface portion, and a packing accommodated in the seal space. A seal region that seals by being in close contact with the seal region, and a second inner that is provided on the axially proximal end side of the seal region and surrounds the tip portion of the tip cylinder portion in a position-regulated manner in the combined state. It has a peripheral surface portion and.

In the present invention, the second inner peripheral surface portion preferably has an inner dimension equal to or less than the minimum inner dimension (for example, inner diameter, the same applies hereinafter) of the first inner peripheral surface portion. In particular, it is desirable that the inner dimension of the second inner peripheral surface portion is smaller than the inner dimension of the first inner peripheral surface portion within a range that can surround the tip cylinder portion.

In the present invention, it is preferable that the axial length of the first inner peripheral surface portion is equal to or larger than the axial length of the second inner peripheral surface portion.

In the present invention, it is preferable that the first inner peripheral surface portion is provided with a guide surface region formed in a conical shape on the tip end side in the axial direction so as to open toward the tip end side in the axial direction. In this case, further, the first inner peripheral surface portion coincides with the inner dimension of the guide surface region on the axial direction base end side and the most axial direction base end side of the guide surface region, and is along the axial direction. It is desirable to have a flat area with the same inner dimensions.

In the present invention, the axial length of the first inner peripheral surface portion is Lr, the axial length of the seal region is Ls, the axial length of the second inner peripheral surface portion is Lt, and the tip thereof. Assuming that the length of the tubular portion in the axial direction is Li, it is preferable that the following equations (1) and (2) are satisfied.
Lr + Ls + Lt ≧ Li ... (1)
Lr + Ls <Li ... (2)

In the present invention, the inner dimension of the first inner peripheral surface portion is Ir, the inner dimension of the seal region when the insert is not attached is Is, the inner dimension of the second inner peripheral surface portion is It, and the tip cylinder. Assuming that the outer dimension (for example, outer diameter, the same applies hereinafter) of the portion is Oi, it is preferable that the following equations (3) to (5) are satisfied.
Ir> Oi ... (3)
Is <Oi ... (4)
It> Oi ... (5)
Here, if ΔD = Ir-Oi and ΔS = Ir-It, it is preferable that the following equation (6) holds.
ΔD−ΔS = It−Oi ≧ 0… (6)
In particular, it is desirable that the following equation (7) is used.
ΔD−ΔS> 0… (7)
In other words, Ir and It are preferably related to the following formula (8), and particularly preferably to the following formula (9).
Ir ≧ It ... (8)
Ir> It ... (9)

Next, the receiving tool for the plug-in type coupling joint of the present invention is configured so as to be urged in the protruding direction inside the receiving port for receiving the inserting tool and the inside of the receiving port so as to be engaged with the locking step portion. A locking claw, a first inner peripheral surface portion provided on the axially proximal side of the locking claw and having a first inner dimension (for example, an inner diameter, the same applies hereinafter), and the first inner peripheral surface portion. Further, it is composed of a seal space provided on the outer periphery on the axial direction base end side and a packing accommodated in the seal space, and has an inner dimension smaller than the first inner dimension when the packing is not subjected to an external force. It has a seal region and a second inner peripheral surface portion provided on the axially proximal end side of the seal region and having a second inner dimension (for example, inner diameter, the same applies hereinafter) larger than the inner dimension of the packing. ..

In the present invention, the second inner dimension is preferably equal to or less than the minimum portion of the first inner dimension. In particular, it is desirable that the second inner dimension is smaller than the first inner dimension within a range that can surround the tip cylinder portion.

In the present invention, it is preferable that the axial length of the first inner peripheral surface portion is the same as or longer than the axial length of the second inner peripheral surface portion.

In the present invention, it is preferable that the first inner peripheral surface portion is provided with a guide surface region formed in a conical shape on the tip end side in the axial direction so as to open toward the tip end side in the axial direction. In this case, further, the first inner peripheral surface portion coincides with the inner dimension of the guide surface region on the axial direction base end side and the most axial direction base end side of the guide surface region, and is along the axial direction. It is desirable to have a flat area with the same inner dimensions.

According to the present invention, when the tip tube portion of the insert is mounted in the receiving port of the receiver, the tip of the tip tube portion is the first inner peripheral surface portion and the second inner peripheral surface portion at the back of the seal region. By reaching, the tip of the tip tube is restricted in position by the second inner peripheral surface even if stress is applied between the insert and the receiver, and the inclination range of the tip tube in the socket is limited. Therefore, it is possible to suppress the deformation of the leaf spring and the locking claw.

It is a vertical cross-sectional view which shows the state which started to insert the insertion tool into the receiving port of the receiving tool in the 1st Embodiment of the plug-in type coupling joint which concerns on this invention. In the first embodiment, it is a vertical cross-sectional view showing a state in which the tip tubular portion of the insert is in contact with the locking claw of the receiver. In the first embodiment, it is a vertical cross-sectional view showing a state in which the insert and the receiver are completely connected. It is an enlarged sectional view of the joint part in 1st Embodiment. It is an enlarged sectional view of the coupling part of the 2nd Embodiment which concerns on this invention. It is an enlarged cross-sectional view of the coupling part of the 3rd Embodiment which concerns on this invention. It is a vertical cross-sectional view which shows the coupling state of the plug-in type coupling joint for the conventional firefighting. It is a schematic perspective view which shows the structure of the plug-in type coupling joint for the conventional firefighting.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, the plug-in joint 1 of the first embodiment according to the present invention will be described with reference to FIGS. 1 to 4. Here, FIG. 1 shows a state in which the insertion tool 10 of the fire-fighting joint 1 has begun to be inserted into the receiving port 20a of the receiving tool 20, and FIG. FIG. 3 is a vertical cross-sectional view showing a state in which the locking step portion 11 and the locking claw 24 are completely locked and coupled to each other while being inserted while being pushed. Further, FIG. 4 is an enlarged cross-sectional view showing an enlarged main part of the bonded structure in the bonded state.

The plug-in joint 1 includes an insert 10 and a receiver 20. The insertion tool 10 is basically the same as the conventional structure, and is equipped with a push ring 14 and has a tip cylinder portion 11 provided with an insertion port 10a. As shown in FIG. 4, the tip tubular portion 11 is configured in a tubular shape (cylindrical shape in the illustrated example) having external dimensions (outer diameter in the illustrated example, the same applies hereinafter) Oi, and starts from the tip outer edge 11p in the axial direction. It is provided with an outer peripheral surface 11a having a cylindrical surface shape (cylindrical surface shape in the illustrated example) up to the base end outer edge 11q. Further, a locking step portion 11b facing the axial direction base end side (right side in the drawing) is provided at the axial direction base end of the tip tubular portion 11, and the locking step portion 11b after that is provided with the locking step portion 11b. The outer diameter dimension Oj of the side insert body 12 is smaller than the outer diameter dimension Oi. In addition, the length Li in the axial direction of the tip cylinder portion 11 and the outer diameter dimensions Oi and Oj are described in JIS B9911-1968 (dimensions of plug-in fittings for fire hose, the same applies hereinafter) as described in "4. _{The dimensions l 2} and d ₁ and d _{2 of the} “6 fittings” specify the nominal 40 to 75, respectively. However, there is no particular regulation for large diameter joints exceeding the nominal 75.

On the other hand, the receiving tool 20 includes a receiving port 20a, a receiving tool main body 22, a tightening ring 23, a locking claw 24, a leaf spring 25, a claw seat 26, a protective member 27, and a packing 28, which are the same as those of the conventional structure. A plurality of (three in the illustrated example) locking claws 24 are urged by leaf springs 25 in the direction of projecting toward the inner diameter side of the socket 20 on the back side (axial base end side, left side in the drawing) of the socket 20a. ing. A first inner peripheral surface portion 22r formed by the opening edge of the receiving tool main body 22 is formed on the proximal end side of the locking claw 24 in the axial direction. The first inner peripheral surface portion 22r is configured to surround the tip tubular portion 11 of the insert 10 in a position-regulated manner in the coupled state shown in FIGS. 3 and 4. The first inner peripheral surface portion 22i has a cylindrical surface shape (cylindrical surface shape in the illustrated example), and its inner dimension (inner diameter in the illustrated example, the same applies hereinafter) Ir is slightly larger than the outer dimension Oi of the tip tubular portion 11. big. For example, in JIS B9911-1968, there is a difference of 0.4 to 0.5 mm between _{the dimension d 1 of the "4.6 insert fitting" and the dimension D 2} of the "4.1 receiving bracket". Therefore, there is a similar dimensional difference (diameter difference) ΔD between the inner dimension Ir and the outer dimension Oi. That is, ΔD = Ir-Oi.

On the axial direction base end side of the first inner peripheral surface portion 22r, a seal region 22s formed by accommodating the packing 28 in the annular groove 22d is formed. The annular groove 22d is configured to have a rectangular cross section in the illustrated example, and the packing 28 is formed of rubber having a U-shaped cross section or the like. When the packing 28 is housed in the annular groove 22d and the insertion tool 10 is not inserted, the packing 28 is smaller than the inner dimension Ir of the first inner peripheral surface portion 22r as shown by the dotted line in FIG. It is configured to have an inner dimension (inner diameter in the illustrated example, the same applies hereinafter) Is. As a result, the sealing region 22s seals (seals) between the inside and the outside of the joint in the coupled state by the packing 28 coming into close contact with the outer peripheral surface 11a of the tip cylinder portion 11.

As shown in FIG. 4, (the inner diameter in the illustrated example, the same applies hereinafter) inside dimension of the first inner peripheral surface portion 22r is Ir, in B9911-1968 of JIS, by the dimensions _{D 2} of the "4.1 receiving metal", called Each of 40 to 75 is specified. However, there is no particular regulation for large diameter joints exceeding the nominal 75.

The first inner peripheral surface portion 22r and the seal region 22s are also provided in the conventional structure. However, in the present embodiment, the second inner peripheral surface portion 22t is formed on the proximal side in the axial direction of the seal region 22s. The second inner peripheral surface portion 22t is configured to surround the tip tubular portion 11 in a position-regulated manner in the coupled state shown in FIGS. 3 and 4. The second inner peripheral surface portion 22t has a cylindrical surface shape (cylindrical surface shape in the illustrated example), and its inner dimension (inner diameter in the illustrated example, the same applies hereinafter) It is slightly larger than the outer dimension Oi of the tip tubular portion 11. big. Further, the sum Lr + Ls + Lt of the axial length Lt of the second inner peripheral surface portion 22t, the axial length Lr of the first inner peripheral surface portion 22r, and the axial length Ls of the seal region 22s is the above-mentioned "4. by the dimensions _{L 2} .1 receiving metal "is defined respectively for nominal 40-75. However, there is no particular regulation for large diameter joints exceeding the nominal 75. The first inner peripheral surface portion axial length Lr of 22r of frontward of the sealing region 22s is illustrated by the dimension L ₁ of the above-mentioned "4.1 receiving metal", the dimension L1 in the preferred dimensions Yes, it is not the specified size. The second inner peripheral surface portion 22t has a conical surface shape so as to open toward the tip side in the axial direction (right side in the drawing) so as to be similar to the first inner peripheral surface portion 22r'of the second embodiment described later. It may be configured. This configuration is particularly effective when ΔS> 0, which will be described later, is provided. Further, the second inner peripheral surface portion 22t may have any other surface shape.

In order for the second inner peripheral surface portion 22t to surround the tip cylinder portion 11, the inner dimension It must be larger than the outer dimension Oi. However, if the inner dimension It is larger than the outer dimension Oi, the second inner peripheral surface portion 22t does not come into contact with the outer peripheral surface 11a of the tip cylinder portion 11, so that the position can not be regulated. Therefore, in the present embodiment, when the inner dimension It is inclined with respect to the axis of the receiver 20 of the axis of the insert 10 made possible by the dimension difference ΔD in the combined state shown in FIGS. 3 and 4. , The tip outer edge 11p of the tip portion of the tip cylinder portion 11 is set in a range where it can come into contact with the second inner peripheral surface portion 22t. As a result, the inclination range of the axis of the insertion tool 10 can be regulated by the interference between the tip outer edge 11p of the tip tube 11 and the second inner peripheral surface 22t, so that the locking claw 24 by the base end outer edge 11q of the tip tube 11 can be regulated. The degree of interference is limited, and as a result, deformation of the locking claw 24 and the leaf spring 25 can be suppressed.

As shown in FIGS. 3 and 4, in order to be in the coupled state, between the sum Lr + Ls + Lt of the axial lengths in the socket 20a of the receiver 20 and the axial length Li of the tip cylinder portion 11 of the insert 10. In addition, it is necessary that Lr + Ls + Lt ≧ Li is established. However, as described above, in order to configure the tip outer edge 11p of the tip cylinder portion 11 to be position-regulated by the second inner peripheral surface portion 22t, not only the above-mentioned inner dimension It but also the axial length dimension is required. There are also conditions. That is, it is necessary that Lr + Ls <Li is satisfied as a condition for configuring the tip cylinder portion 11 so as to be arranged on the second inner peripheral surface portion 22t in the coupled state. In the illustrated example, Ir = It, but it is not particularly limited, and Ir> It may be set as described later, or Ir <It may be set.

In the present embodiment configured as described above, in the coupled state shown in FIGS. 3 and 4, the tip end side portion of the tip end cylinder portion 11 is surrounded by the second inner peripheral surface portion 22t, and the second end cylinder portion 11 is surrounded by the second inner peripheral surface portion 22t. The inner peripheral surface portion 22t of the insert 10 limits the inclination of the insert 10 with respect to the receiver 20 in the axial direction. Therefore, even if a large bending moment is received between the insert 10 and the receiver 20 due to an operation on the plug-in type joint or water pressure, the locking step portion 11b of the tip cylinder portion 11 is the locking claw 24. It is possible to prevent the locking claw 24 and the leaf spring 25 from being deformed due to interference with the locking claw 24. As a result, in the above-mentioned coupling state, the coupling state of the insertion tool 10 and the receiver 20 may be disengaged due to a malfunction, or conversely, the coupling state may not be released even if the push wheel 14 is operated. Can be prevented.

In particular, by making the inner dimension It of the second inner peripheral surface portion 22t slightly smaller than the inner dimension Ir of the first inner peripheral surface portion 22r (ΔS = Ir-It> 0), the second inner peripheral surface portion 22t By reducing the dimensional difference ΔD> 0 in the region of, the inclination of the axis of the insert 10 can be further reduced, so that the deformation of the locking claw 24 and the leaf spring 25 can be further reduced, and the deformation is almost eliminated. It is also possible to prevent it from occurring. However, since the second inner peripheral surface portion 22t must be able to surround the tip cylinder portion 11 to the last, ΔS <ΔD. In this case, since the approximate posture of the tip cylinder portion 11 is regulated in advance by the first inner peripheral surface portion 22r, the tip outer edge 11p of the tip cylinder portion 11 is fitted to the second inner peripheral surface portion 22t at the time of mounting. The work is not so difficult.

Next, the plug-in type coupling joint of the second embodiment according to the present invention will be described with reference to FIG. In this embodiment, the first inner peripheral surface portion 22r'is not a cylindrical surface shape but a guide surface region formed in a conical surface shape open to the tip end side of the receiving port 20a. As a result, after the tip tube portion 11 of the insertion tool 10 is inserted into the receiving port 20a and passes over the locking claw 24, the tip outer edge 11p of the tip tube portion 11 is guided by the first inner peripheral surface portion 22r'. As a result, the axis of the tip tube 11 can be easily aligned with the axis of the receiving port 20a, so that the tip tube 11 can be smoothly inserted, and the tip outer edge 11p of the tip tube 11 fits into the second inner peripheral surface portion 22t'. It will be easier to fit. In particular, as described above, even when the inner dimension It is slightly smaller than the inner dimension Ir, the mounting operation can be easily performed.

Next, with reference to FIG. 6, the plug-in type coupling joint according to the third embodiment of the present invention will be described. The difference between this embodiment and the first and second embodiments is that, first, the axial length Lr of the first inner peripheral surface portion 22r ″ is set to the axial length of the second inner peripheral surface portion 22t ″. The length is larger than Lt (Lr> Lt). In this way, the position and orientation of the tip cylinder portion 11 is regulated by the first inner peripheral surface portion 22r ″ having a large length Lr in the axial direction, so that the position and orientation of the insert 10 is the axis of the receiver 20 ″. It becomes easier to match with, and the subsequent fitting work to the second inner peripheral surface portion 22t ″ can be further facilitated.

Further, in the present embodiment, a guide configured in a conical shape on the axial tip side (right side in the drawing) of the first inner peripheral surface portion 22r ″, similarly to the first inner peripheral surface portion 22r ′ of the second embodiment. A surface region 22 rg is formed, and a cylindrical flat region 22 rs is formed in the remaining portion on the proximal end side in the axial direction. This facilitates the mounting work as in the second embodiment and has a large axial direction. By the length Lr of the above and the regulation work of the flat region 22rs, the position and posture of the insert can be further restricted, so that the mounting work can be greatly facilitated.

It should be noted that the method and apparatus of the present invention are not limited to the above-mentioned illustrated examples, and it goes without saying that various modifications can be made without departing from the gist of the present invention. For example, in each of the above embodiments, the insert and the receiver each have a connection port for a fire hose, but for example, a joint for connecting different objects such as a fire hydrant and a hose, and a hose and a pipe spear. It may be a joint that is not for fire fighting. Further, in the above embodiment, the value of the nominal diameter is not particularly limited, but it is particularly effective when a large bending moment is applied. It is desirable to use it for a large-diameter joint to be added, for example, a large-diameter joint having a nominal diameter of more than 75. Further, the lengths Lr, Ls, and Lt in the axial direction are not particularly limited. For example, the nominal 40 is 2.2 mm, 7 mm, 3 mm, the nominal 50 is 3 mm, 9 mm, 3 mm, the nominal 65 is 3 mm, 10 mm, 3 mm, the nominal 75 is 4 mm, 11 mm, 4 mm, and the nominal 90 is 5 mm. The dimensions can be 9 mm, 6 mm, or the like. Moreover, the feature points of each of the above embodiments can be configured in any combination as long as they do not interfere with each other.

1 ... Coupling joint, 10 ... Insert, 10a ... Outlet, 11 ... Tip cylinder, 11a ... Outer surface, 11b ... Locking step, 11p ... Tip outer edge, 11q ... Base end outer edge, 12 ... Insert body, 13 ... Connection part, 14 ... Release member, 20 ... Receiving tool, 20a ... Receiving port, 21 ... Tip inner edge part, 22 ... Receiving device main body, 22a ... Connecting part, 22b ... Mounting frame part, 22d ... Circular groove, 22r ... No. Inner peripheral surface portion of 1, 22 rg ... guide surface region, 22 rs ... flat region, 22 s ... seal region, 22 t ... second inner peripheral surface portion, 23 ... tightening ring, 23a ... mounting seat, 24 ... locking claw, 25 ... plate Spring, 26 ... Claw seat, 27 ... Protective member, 28 ... Packing, Li ... Axial length of tip tube, Lr ... Axial length of first inner peripheral surface, Ls ... Axial direction of seal area Length, Lt ... Axial length of the second inner peripheral surface portion, Oi ... Outer dimension (outer diameter) of the tip cylinder portion, Oj ... Outer dimension (outer diameter) of the insert body, Ir ... Inner dimension (inner diameter) of the inner peripheral surface, Is ... Inner dimension (inner diameter) when the packing in the seal area is not subjected to external force, It ... Inner dimension (inner diameter) of the second inner peripheral surface

Claims (6)

In a plug-in type joint joint including a fitting having a tip tubular portion having a locking step on the axial direction base end side and a receiver having a receiving port configured to accept the tip tubular portion.
The outer peripheral surface of the tip tubular portion of the insert has a cylindrical surface shape.
The receiver is
A locking claw that is urged inside the receiving port in a protruding direction and is configured to be engaged with the locking step portion in a state where the insertion tool and the receiving tool are connected.
A first inner peripheral surface portion provided on the axially proximal end side of the locking claw and surrounding the proximal end portion of the tip tubular portion in a position-regulated manner in the coupled state.
It is composed of a seal space provided on the proximal side in the axial direction of the first inner peripheral surface portion and a packing accommodated in the seal space, and the packing is brought into close contact with the tip cylinder portion in the bonded state to seal the seal. Seal area and
The seal region is further provided on the proximal side in the axial direction, is configured in a conical surface so as to open toward the distal end side in the axial direction, and the tip portion of the tip tubular portion can be position-regulated in the combined state. It has a second inner peripheral surface that surrounds it,
The second inner peripheral surface portion is described when the axis of the insert is inclined with respect to the axis of the receiver due to the difference between the outer dimension of the tip cylinder portion and the inner dimension of the first inner peripheral surface portion. tip edge of the tip portion of the distal tube portion is Ru is set to the range that can contact with the second inner peripheral surface,
Plug-in joint. The first inner peripheral surface portion has a cylindrical surface shape.
The plug-in type joint according to claim 1. The first inner peripheral surface portion includes a guide surface region formed in a conical shape on the tip side in the axial direction so as to open toward the tip side in the axial direction.
The plug-in type joint according to claim 1. The first inner peripheral surface portion is flat on the axial direction proximal end side of the guide surface region, which coincides with the inner dimension of the guide surface region on the most axial proximal end side and has the same inner dimension along the axial direction. Have an area,
The plug-in type joint according to claim 3. The axial length of the first inner peripheral surface portion is equal to or larger than the axial length of the second inner peripheral surface portion.
Plugin coupling joint according to any one of claims 1 -4. The axial length of the first inner peripheral surface portion is Lr, the axial length of the seal region is Ls, the axial length of the second inner peripheral surface portion is Lt, and the axial length of the tip cylinder portion. Assuming that the length in the direction is Li, the following equations (1) and (2) hold.
Lr + Ls + Lt ≧ Li ... (1)
Lr + Ls <Li ... (2)
Plugin coupling joint according to any one of claims 1 -5.

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