JP4522178B2 - Duct joint - Google Patents

Description

  The present invention relates to a duct joint, and more specifically, a first connection port portion that can be fitted and connected to the first duct portion and a second duct portion that can be fitted and connected to the second duct portion at both ends of the joint body. 2 connection ports are formed with a phase difference corresponding to the angle of intersection of both mounting surfaces, and both outer surfaces facing each mounting surface of the outer peripheral surface of the joint body are mounted The present invention relates to a duct joint that is formed on a flat surface along the surface and the remaining outer surface is formed into a twisted curved surface that absorbs a phase difference between the first connection port portion and the second connection port portion.

In recent years, in air conditioning piping connected from indoor units in buildings to outdoor units outside the building, the piping is placed in a duct along a piping path such as a mounting surface such as a wall or ceiling. Thus, the piping is protected and the appearance is improved, and such duct piping is used for the construction of many air conditioning piping.
However, in the case of such a duct pipe, for example, the same wall is arranged such that the duct pipe is arranged perpendicularly to the wall and the duct pipe is horizontally arranged from the upper end to the wall along the ceiling wall via the duct joint. Can be installed as a mounting surface, but duct piping cannot be carried out across two crossing mounting surfaces such as a wall and a ceiling wall. In such a case, two crossing mounting surfaces Although it has been attempted to change to another piping route that does not cross the surface, on the other hand, the route of the piping is often long, and there are indications that require labor and construction costs.
Therefore, conventionally, for example, a vertical pipe duct piped on a wall and a horizontal pipe duct piped on a ceiling wall are connected via a duct joint to straddle the wall and the ceiling wall. There is a pipe duct that enables connection between pipe ducts across two intersecting mounting surfaces (see, for example, Patent Document 1).
Specifically, when connecting duct ducts with a right angle arrangement, pipe connection ports for pipe ducts are formed in the box-shaped joint body in the three directions of the T-shaped arrangement. Block the remaining unused pipe connection ports with a blocking lid, and connect horizontal duct pipes to each other using two horizontally arranged piping connection ports and block the remaining unused piping connection ports with a blocking lid. It is configured to use.

JP 1001-222194 A (page 4-6, FIG. 2, FIG. 3)

However, such a duct joint has a structure in which a pipe connection port is simply provided in a box-shaped joint body, and is obstructed when used for connecting a duct arranged at right angles or a duct arranged horizontally. Since there is a pipe connection port that is closed with a lid, it can be used for a plurality of specified pipe forms, but in use, it is not necessary for parts that do not require a closed part. There is a problem that the product structure becomes a cost part and is unappealing in appearance, resulting in a cost-sensitive product form.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a duct joint that has a good appearance and is cost-effective.

A first duct portion which is disposed along one of the two cross possible the mounting surface, the configuration of connecting communication from the other direction opposite the second duct portion which is disposed along the object mounting surface The first connecting port portion that can be fitted and connected to the first duct portion and the second connecting port portion that can be fitted and connected to the second duct portion are attached to both ends of the joint body. Of the outer peripheral surface of the joint body, both outer surfaces facing each mounted surface are formed as flat surfaces along the mounting surface, and the rest The outer surface may be formed as a curved surface in a twisted state that absorbs the phase difference between the first connection port and the second connection port .

According to the above Ki構 formed, the first duct portion is fitted and connected to the first joint port, by fitting connecting the second duct portion to the second joint port, the mounting surface of two possible intersection It is possible to connect the pipes across.
In addition, the first connection port portion and the second connection port portion of the duct joint are configured such that the first duct portion and the second duct portion can be connected in communication from opposite directions, and both the duct portions are attached. In this state, both outer side surfaces of the joint body facing each mounted surface are formed as flat surfaces, and the remaining outer peripheral surface absorbs the phase difference between the first connection port portion and the second connection port portion. Therefore, it is possible to form a duct piping state with a good appearance.

  Therefore, like the conventional duct joint, the pipe connection port of the pipe duct is formed in the three directions of the T-shaped arrangement only in the box-shaped joint body, and there are unnecessary components in use. Compared with the product configuration in which the part becomes an unnecessary cost part, the appearance of the use state is good and there is no unnecessary part. Therefore, there is no useless production part and the cost can be improved.

In addition, the first duct portion having a substantially rectangular cross-sectional shape disposed along one of the two mountable mounting surfaces and the cross-sectional shape disposed along the other mounted surface are approximately. In the configuration in which the rectangular second duct portion is connected in communication,
At both ends of the joint body, a first connection port portion that can be fitted and connected to the first duct portion, and a second connection port portion that can be fitted and connected to the second duct portion are provided on both mounting surfaces. It is formed with a phase difference corresponding to the crossing angle, and of the outer peripheral surface of the joint body, both outer surfaces facing each mounted surface are formed as flat surfaces along the mounting surface, and the remaining The outer side surface may be formed in the curved surface of the twist state which absorbs the phase difference of a 1st connection port part and a 2nd connection port part.

According to the above Ki構 formed, the first duct portion is fitted and connected to the first joint port, by fitting connecting the second duct portion to the second joint port, the mounting surface of two possible intersection It is possible to connect the pipes across.
In addition, the first connection port portion and the second connection port portion of the duct joint are configured such that the first duct portion and the second duct portion can be connected in communication from opposite directions, and both the duct portions are attached. In this state, even if the cross-sectional shape of the duct portion to be connected is substantially rectangular, both outer side surfaces of the joint body facing each mounted surface are formed as flat surfaces, and the remaining outer peripheral surface is the first outer surface. Since it is formed in the curved surface of the twist state which absorbs the phase difference of a connection port part and a 2nd connection port part, the duct piping state with a good appearance can be formed.

  Therefore, like the conventional duct joint, the pipe connection port of the pipe duct is formed in the three directions of the T-shaped arrangement only in the box-shaped joint body, and there are unnecessary components in use. Compared with the product configuration in which the part becomes an unnecessary cost part, the appearance of the use state is good and there is no unnecessary part. Therefore, there is no useless production part and the cost can be improved.

Further, the joint body is constituted by a pair of split joint members that are detachable from the vertical direction of one of the mounted surfaces and form a cylindrical body in the mounted state, and at least the split joint member on the mounted surface side is The mounting surface may be configured to be attachable via a fixing means .

According to the above Ki構 formed by a split joint member on one of the mounting surface, and secured through a securing means, mounted to the other of the split joint members split joint member while the anchored, the joint body On the contrary, the joint body can be disassembled by unmounting the other split joint member from the one split joint member fixed to one of the mounted surfaces.

  Therefore, in the process of making an assembly state on one mounted surface, by connecting the duct portion corresponding to each connection port portion of the joint body, the duct pipe can be arranged with good setup, and the assembly property is good. Since disassembly can also be performed easily, the arrangement, maintenance, and removal work from the mounted surface can be performed with good setup.

Further, either one of the two connection ports of the joint body is configured to be internally fitted and connectable to the corresponding duct part, and the other is configured to be externally connectable to the corresponding duct part. The mating portion on the inner fitting connection side of both split joint members may be provided with an engaging means that is detachable from the direction perpendicular to one of the attached surfaces .

According to the above Ki構 formed, the duct portion connected to the other connection opening is its corresponding fitted at the other connecting port portion connected, the state of this split joint members together which are combined by is restricted Since it is formed, even if it is engagement of a limited part, such as providing an engagement means in a part such as a mating part on one inner fitting connection side, the duct parts corresponding to both connection port parts are connected. Thus, it is possible to form a combination state in which the split joint members are not disassembled arbitrarily.

  Therefore, it is easy to handle, and the engagement means is provided in a limited joint body part such as the mating part on one inner fitting connection side. In addition, it is possible to combine the split joint members with the engagement means as a mark, so that it is easy to handle and use.

The characteristic structure of the first duct joint of the present invention is arranged along one of two crossable mounting surfaces with the outer surface on the long side facing the mounting surface in a cross-sectional shape. A first duct portion having a substantially rectangular cross-sectional shape, and a cross-sectional shape disposed along the other attached surface with the outer surface on the long side of the cross-sectional shape facing the attached surface Is a duct joint that communicates and connects the substantially rectangular second duct portion,
A substantially rectangular first connection port that can be fitted and connected to the first duct portion at both ends of the joint body, and a substantially rectangular second connection port that can be fitted and connected to the second duct portion And are integrally formed with a phase difference corresponding to the angle of intersection of both mounting surfaces,
Of the outer peripheral surface of the joint body, both outer surfaces facing the respective mounting surfaces are formed as flat surfaces along the mounting surface, and the remaining outer surfaces are positioned between the first connection port portion and the second connection port portion. It is in the point formed in the curved surface of the twist state which absorbs a phase difference.
The characteristic configuration of the second duct joint of the present invention is that the first duct portion having a substantially rectangular cross-sectional shape disposed along one of the two crossable mounting surfaces and the other mounting surface A duct joint that connects the second duct portion having a substantially rectangular cross-sectional shape disposed along
At both ends of the joint body, a first connection port portion that can be fitted and connected to the first duct portion, and a second connection port portion that can be fitted and connected to the second duct portion are provided on both mounting surfaces. It is formed with a phase difference corresponding to the crossing angle, and of the outer peripheral surface of the joint body, both outer surfaces facing each mounted surface are formed as flat surfaces along the mounting surface, and the remaining The outer surface is formed in a curved surface in a twisted state that absorbs the phase difference between the first connection port and the second connection port,
The joint body is constituted by a pair of split joint members that are detachable from the vertical direction of one mounted surface and that form a cylindrical body in the mounted state;
Either one of the two connection ports of the joint body is configured so that the corresponding duct portion can be internally fitted and connected, and the other is configured so that the corresponding duct portion can be externally fitted and connected. The fitting portion on the inner fitting connection side of the joint member is provided with an engaging means that is detachable from the vertical direction of one of the attached surfaces.
The characteristic configuration of the third duct joint according to the present invention includes a first duct portion disposed along one of two crossable mounting surfaces and a first duct portion disposed along the other mounting surface. A duct joint for connecting and connecting two duct parts in an opposing direction,
At both ends of the joint body, a first connection port portion that can be fitted and connected to the first duct portion, and a second connection port portion that can be fitted and connected to the second duct portion are provided on both mounting surfaces. It is formed with a phase difference corresponding to the crossing angle, and of the outer peripheral surface of the joint body, both outer surfaces facing each mounted surface are formed as flat surfaces along the mounting surface, and the remaining The outer surface is formed in a curved surface in a twisted state that absorbs the phase difference between the first connection port and the second connection port,
The joint body is constituted by a pair of split joint members that are detachable from the vertical direction of one mounted surface and that form a cylindrical body in the mounted state;
Either one of the two connection ports of the joint body is configured so that the corresponding duct portion can be internally fitted and connected, and the other is configured so that the corresponding duct portion can be externally fitted and connected. The fitting portion on the inner fitting connection side of the joint member is provided with an engaging means that is detachable from the vertical direction of one of the attached surfaces.
The characteristic configuration of the fourth duct joint of the present invention is that the split joint member on the mounted side of the joint body is marked with a reference line for centering with the duct portion fitted therein. .

  According to the above-mentioned characteristic configuration, the split joint member on the mounting side is accurately attached to the mounting surface on the piping path, and the duct portion to be internally fitted is aligned with reference to the reference line of the split joint member. By disposing the duct portion to be performed, the duct portion can be quickly placed in an accurately disposed state.

  Therefore, it is possible to arrange duct piping with high piping quality.

  Hereinafter, a duct joint to which the present invention is applied will be described with reference to the drawings.

Embodiment
In this embodiment, as shown in FIGS. 1 to 3, for example, a pipe 1 </ b> A is set up vertically from an outdoor unit (not shown) of an air conditioner along the outer wall B of the building, and eaves C Is used to store and protect the middle part of the piping route of the air-conditioning piping 1 leading to the indoor unit (not shown) of the adjacent building, and in particular, two intersections such as the outer wall B and the eaves C (90 degree angle) possible first duct part D arranged along the attachment surface B1 of one wall B and second duct arranged along the attachment surface C1 of the other eave C The duct joint A used for the connection part of the duct parts D and E arrange | positioned ranging over two to-be-attached to-be-attached surfaces B1 and C1 called the part E is demonstrated.

  That is, as shown in FIGS. 1 to 7, the duct joint A is provided at both ends of the joint body A <b> 1 with respect to the first duct portion D disposed along the mounted surface B <b> 1 that is the wall surface of the outer wall B. 10A of 1st connection port parts which can be fitted and connected, and the 2nd connection port part which can be fitted and connected with respect to the 2nd duct part E arrange | positioned along the to-be-attached surface C1 which is the eaves lower surface of the eaves C 10B is formed in a mouth state having a phase difference of approximately 90 degrees corresponding to the crossing angle of both mounting surfaces B1, C1, and among the outer peripheral surfaces of the joint body A1, each mounted surface B1, Both outer surfaces 10C, 10D facing C1 are formed as flat surfaces along the mounting surface, and the remaining outer surfaces 10E, 10F absorb the phase difference between the first connection port portion 10A and the second connection port portion 10B. It is formed on a curved surface in a twisted state.

  As shown in FIGS. 1 to 3, the first duct portion D forms connection ports 2 </ b> A and 2 </ b> B having a substantially rectangular shape at a 90-degree angle position, and is perpendicular to one mounting surface (outer wall) B <b> 1. A pair of split duct members 2C and 2D that can be detached from each other, and a pair of ends that are fitted and connected to one connecting port 2A, and are also detachable from one mounting surface B1 in the vertical direction. The straight duct 3 having a substantially rectangular cross section is formed of the divided duct members 3A and 3B. The two ducts 2 and 3 are fixed to the divided duct members 2C and 3A on the mounting surface B1 side, such as tap screws. It can be attached via means 4.

  The second duct portion E is a straight section having a substantially rectangular cross section formed by a pair of substantially U-shaped divided duct members 5A and 5B that can be attached to and detached from the other attachment surface (eave) C1 in the vertical direction. This duct 5 is configured such that one divided duct member 5A can be attached to the other attachment surface C1 via fixing means 4 such as a tap screw.

The elbow-shaped duct 2 of the first duct portion D is formed with an outward facing stepped portion 2E at one of the facing butted ends of the divided duct members 2C and 2D, which are assembly components, and the other. An inwardly facing locking step 2F is formed so that both 2E and 2F can be engaged, and both divided duct members 2C and 2D are detachable.
Further, a female screw 2E is formed in one divided duct member 2C corresponding to the mounted surface B1, and a screw receiving hole 2F is formed in the other divided duct member 2D, and both divided ducts are connected via a set screw 2G. The members 2C and 2D are configured to be connectable.

  The straight pipe ducts 3 and 5 of both the duct portions D and E are formed with outwardly engaging claws 3C and 5C at one of the facing butted ends of the divided duct members 3A, 3B, 5A and 5B, On the other hand, inwardly engaging claw receivers 3D and 5D are formed, and both divided duct members 3A, 3B, 5A and 5B are attached and detached using the elastic deformation of both divided duct members 3A, 3B, 5A and 5B. It is possible.

  The joint body A1 of the duct joint A is detachable from the vertical direction of one of the attachment surfaces B1, and in a mounted state, a pair of split joint members A2, A3 molded from a synthetic resin that forms a cylindrical body. The split joint member A2 on the one mounted surface B1 side is configured to be attachable to the mounted surface B1 through fixing means 4 such as a tap screw.

  In addition, as shown in FIGS. 4 to 7, in the duct joint A of this embodiment, the first connection port portion 10 </ b> A of the joint main body A <b> 1 is the other connection port of the elbow-shaped duct 2 constituting the first duct portion D. 2B is configured so that it can be internally fitted, and the second connection port portion 10B is configured so that the pipe end of the straight pipe duct 5 that constitutes the second duct portion E can be externally fitted, and both split joint members A2 , A3 is provided with an engagement means A4 that is detachable from the vertical direction of one of the attachment surfaces B1 at the mating portion on the inner fitting connection side.

  In the engaging means A4, an inwardly-facing locking step portion 10G is formed on one split joint member A2 at the facing end portions of the split joint members A2 and A3 that are assembly components, and the other split portion is formed. The joint member A3 is formed with an outward-facing locking step 10H so that the two A2 and A3 can be engaged with each other, the both split joint members A2 and A3 are detachable, and the split joint member A2 , A3 is formed with an outward facing locking claw 10I in one split joint member A3 of the facing butting portion, and the other split joint member A2 is a locking hole that can be elastically engaged with the locking claw 10I. 10J is formed so that both split joint members A2 and A3 can be engaged and disengaged, and both split duct members A2 and A3 are detachable.

  In addition, a reference line used for centering for a straight pipe duct fitted and connected to the inner peripheral surface of the outer surface 10D of the split joint member A2 corresponding to the other mounted side C1 of the joint body A1. 10K is marked by a concave groove 10M formed in a state perpendicular to the convex duct 10L of the rear duct stop along the bisecting center position in the longitudinal direction of the mouth in the second connection mouth 10B. The straight pipe duct 5 corresponding to the second connection port portion 10B is aligned so that the position of the straight pipe duct 5 is equally divided in the longitudinal direction of the cross section, so that the end of the straight pipe duct 5 is projected as shown in FIG. By connecting the end portion of the straight pipe duct 5 to the second connection port 10A in a state of being in contact with or close to 10L, the straight pipe duct 5 is connected to the duct joint A in a centered state. It is possible.

  By adopting such a configuration, as shown in FIG. 2, from the pipe path 1 of the air conditioning piping from the outdoor unit of the air conditioner to the indoor unit in this embodiment, that is, from one attached surface B1 which is the outer wall B A split duct member 2C in the elbow-shaped duct 2 and the straight pipe duct 3 constituting the corresponding first duct portion D on one of the mounted surfaces B1 along a path extending over the other mounted surface C1 which is the eaves C, 3C and the split joint member A2 of the duct joint A are attached via the fixing means 4, and the split duct member 5A of the straight pipe duct 5 constituting the corresponding second duct portion E is attached to the other attached surface C1. The fixing means 4 is attached.

  Next, the air conditioning pipe 1 from the outdoor unit is piped along the divided duct members 2C and 3A attached to one of the attached surfaces, the divided joint member A2, and the divided duct member 5A attached to the other attached surface. The split duct members 2D and 2B, the split joint member A3, and the split duct member 5A on the attachment / detachment side, which correspond in the course of going, are fitted together, and as shown in FIG. A duct pipe is formed in which the first duct part D arranged along one side and the second duct part E arranged along the other side are connected via a duct joint A. Storage is protected.

[Another embodiment]
1) In each of the above-described embodiments, the first duct portion D, which is the connection target of the first connection port portion 10A of the duct joint A, includes the elbow-shaped duct 2 and the straight pipe duct 3, and the second connection port portion 10B. The second duct part E, which is the connection target of the above, has been described with respect to the straight pipe duct 5, but as shown in FIG. An angle-changeable duct configured such that the movable duct portion 8B can be connected to the fixed duct portion 8A configured to be connectable to the first connection port portion 10A of the duct joint A so that the angle can be changed around the axis X. 8, and the second duct portion E may be configured from the straight pipe duct 5. In this case, as shown in the figure, for example, the first duct portion D is disposed on the mounting surface B1 which is the outer wall B of the building, and is formed to project outward with an inclination angle from the upper end of the outer wall. In the piping path 1 etc. used across two mounting surfaces B1 and C1 that can be crossed, such that the second duct portion E is arranged in an angle adjusted state on the mounting surface C1 on the lower surface of the roof gutter C. Can be used.
In addition, the same code | symbol is attached | subjected to a component like the said embodiment, and the detail is abbreviate | omitted.

2) In the above embodiment, the connection port 2A of the elbow-shaped duct 2 of the first duct portion D is externally connected by the first connection port portion 10A, and the straight pipe of the second duct portion E is connected by the second connection port 10B. The duct joint A having a configuration in which the duct 5 is fitted and connected has been described. As shown in FIG. 11, the pipe end portion of the straight duct 9 that is the first duct portion D is fitted in the first connection port portion 10A. It may be a duct joint A that is connected and internally connected to the pipe end of the straight pipe duct 5 at the second connection port E. In this case, as shown in the figure, for example, the straight duct 9 that is the first duct portion D is horizontally disposed on the mounting surface B1 that is the outer wall B of the building, and the first duct portion D is disposed. Although the straight pipe duct 5 as the second duct portion E is disposed on the mounting surface C1 that can intersect with the mounting surface B1 at an angle of 90 degrees, It can be used for the piping path 1 used across the attachment surfaces B1 and C1.
In addition, the same code | symbol is attached | subjected to a component like the said embodiment, and the detail is abbreviate | omitted.

Sectional drawing which shows the use condition of the duct coupling of embodiment which applied this invention Exploded perspective view showing the relationship between the duct joint and the mounting surface and the relationship between the duct joint and the first and second duct parts Sectional drawing which shows the state which connected the 1st, 2nd duct part using the duct coupling to the to-be-crossed attachment surface Perspective view showing duct joint Exploded perspective view of duct joint Explanatory drawing showing the relationship between the duct joint and the mounting surface Explanatory drawing showing the relationship between the duct joint and the mounting surface Reference drawing showing engagement means of split joint member Cross section of duct joint Sectional drawing which shows the use condition of the duct coupling of another embodiment to which this invention is applied. Sectional drawing which shows the use condition of the duct coupling of another embodiment to which this invention is applied.

Explanation of symbols

A Duct joint A1 Joint body A2 Split joint member A3 Split joint member A4 Engagement means C1 Mounted surface D First duct part E Second duct part 4 Adhering means 10A First connection port part 10B Second connection port part 10C 10D outer side surface 10E outer side surface 10F outer side surface 10K reference line

Claims (4)

A first duct portion having a substantially rectangular cross-sectional shape disposed along one of the two cross-attachable mounted surfaces with a cross-sectional shape on the mounted surface and an outer surface on the long side facing each other ; , connecting stub cross-sectional shape the outer surface of the long sides of the cross-sectional shape to that the mounting surface along the other of the mounting surface is disposed in a state facing the a second duct section substantially rectangular A duct joint,
A substantially rectangular first connection port that can be fitted and connected to the first duct portion at both ends of the joint body, and a substantially rectangular second connection port that can be fitted and connected to the second duct portion And are integrally formed with a phase difference corresponding to the angle of intersection of both mounting surfaces,
Of the outer peripheral surface of the joint body, both outer surfaces facing the respective mounting surfaces are formed as flat surfaces along the mounting surface, and the remaining outer surfaces are positioned between the first connection port portion and the second connection port portion. A duct joint formed on a curved surface that twists to absorb the phase difference. A first duct portion having a substantially rectangular cross-sectional shape disposed along one of the two crossable mounting surfaces and a substantially rectangular cross-sectional shape disposed along the other mounting surface A duct joint that communicates with the second duct portion of
At both ends of the joint body, a first connection port portion that can be fitted and connected to the first duct portion, and a second connection port portion that can be fitted and connected to the second duct portion are provided on both mounting surfaces. It is formed with a phase difference corresponding to the crossing angle, and of the outer peripheral surface of the joint body, both outer surfaces facing each mounted surface are formed as flat surfaces along the mounting surface, and the remaining The outer surface is formed in a curved surface in a twisted state that absorbs the phase difference between the first connection port and the second connection port ,
The joint body is constituted by a pair of split joint members that are detachable from the vertical direction of one mounted surface and that form a cylindrical body in the mounted state;
Either one of the two connection ports of the joint body is configured so that the corresponding duct portion can be internally fitted and connected, and the other is configured so that the corresponding duct portion can be externally fitted and connected. A duct joint in which an engagement means that is detachable from a direction perpendicular to one of the attached surfaces is provided at a mating portion on the inner fitting connection side of the joint member . A duct joint that connects the first duct portion disposed along one of the two crossable mounting surfaces and the second duct portion disposed along the other mounting surface in an opposing direction. Because
At both ends of the joint body, a first connection port portion that can be fitted and connected to the first duct portion, and a second connection port portion that can be fitted and connected to the second duct portion are provided on both mounting surfaces. It is formed with a phase difference corresponding to the crossing angle, and of the outer peripheral surface of the joint body, both outer surfaces facing each mounted surface are formed as flat surfaces along the mounting surface, and the remaining The outer surface is formed in a curved surface in a twisted state that absorbs the phase difference between the first connection port and the second connection port,
The joint body is constituted by a pair of split joint members that are detachable from the vertical direction of one mounted surface and that form a cylindrical body in the mounted state;
Either one of the two connection ports of the joint body is configured so that the corresponding duct portion can be internally fitted and connected, and the other is configured so that the corresponding duct portion can be externally fitted and connected. A duct joint in which an engagement means that is detachable from a direction perpendicular to one of the attached surfaces is provided at a mating portion on the inner fitting connection side of the joint member . The duct joint according to claim 2 or 3, wherein the split joint member on the attached side of the joint body is marked with a reference line for centering with a duct portion fitted therein .

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