JP2023156585A - Duct device and duct connector - Google Patents

Abstract

To reduce a burden of a worker relating to connecting work of duct such as air-conditioning/ventilation ducts disposed above a head such as a ceiling.SOLUTION: A duct device 1 is equipped with a first duct 10 formed in a cylindrical shape, and a connector 30 that is attached to a tip end portion of the first duct 10, and is compressed between an inner surface of the first duct 10 and an outer surface of a second duct when the second duct formed in a cylindrical shape is inserted in the first duct 10. The connector 30 includes a rod-shaped body part 31, and a groove part 33 that is formed on the body portion 31, extends in a longitudinal direction, and is fitted with a tip end portion of the first duct 10. The groove part 33 is fitted with the tip end portion of the first duct 10 while bending the body part 31.SELECTED DRAWING: Figure 4

Description

The present invention relates to a duct device and a duct connector.

Ducts are widely used in air conditioning systems, ventilation systems, etc. As a conventional technique of this type, there is a technique described in Patent Document 1. According to Patent Document 1, it is a connection structure of a square duct A having a joint part at the end, the joint part is composed of a connection part provided at the end of each wall board, and the connection part is formed by a connection part provided at the end of each wall board. The end portion is folded in three approximately parallel to the surface of the wallboard, and a lower connection part, a middle connection part, and an upper connection part are provided in order from the wallboard side, and the free end of the upper connection part is connected to the lower connection part and the middle connection part. It protrudes beyond the bent part with the connecting part. For example, the square duct A and the square duct B can be connected by simply inserting the upper connecting part of the connecting part of the square duct A between the upper connecting part and the intermediate connecting part of the connecting part of the square duct B. Therefore, it is possible to connect square duct A and square duct B easily and in a short time, and even in narrow or high places, it can be done properly (no leakage at the connection point) without putting a big burden on the worker. It is now possible to connect (without any connection failures).

Japanese Patent Application Publication No. 2018-155289

By the way, air conditioning/ventilation ducts are usually used as air passages by connecting a plurality of ducts. Here, air conditioning and ventilation ducts are often placed overhead, such as in the ceiling. For this reason, the work of connecting air conditioning and ventilation ducts becomes a heavy burden on workers. Additionally, some air conditioning and ventilation ducts are secured with screws to prevent the connected ducts from coming off. The work related to this screw fastening also involves aligning the screw holes and fastening the screws at a high position, which is a heavy burden on the worker.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a duct and a connecting tool that can reduce the burden on workers involved in connecting ducts for air conditioning and ventilation. shall be.

In order to achieve the above object, the present invention includes the configuration described below.

(1) A first duct (for example, first duct 10) formed in a cylindrical shape,
When a second duct (for example, second duct 20) formed in a cylindrical shape is attached to the open end of the first duct and inserted into the first duct, the inner surface of the first duct and the second duct are inserted into the first duct. a flexible member (e.g., connector 30) compressed between the outer surface of the second duct;
The flexible member includes a rod-shaped main body (e.g., main body part 31) and a groove part (e.g., groove part 33) formed in the main body, which extends along the longitudinal direction and fits into the open end of the first duct. ), wherein the groove is fitted into the open end of the first duct while the main body is curved.

According to the duct device (1), when the second duct is inserted into the first duct, the flexible member is compressed between the inner surface of the first duct and the outer surface of the second duct, and the second duct is compressed between the inner surface of the first duct and the outer surface of the second duct. Since the elastic force from the flexible member acts in a direction that pushes the outer surface, the second duct is supported by the first duct via the flexible member. Moreover, since the space between the inner surface of the first duct and the outer surface of the second duct is sealed by the flexible member, the first duct and the second duct are connected so that the internal air does not leak to the outside. Further, the groove at one end of the flexible member is fitted into the open end of the first duct, and while the flexible member is curved, the groove at the end of the flexible member is fitted into the open end of the first duct. By fitting the flexible member into the first duct, it becomes possible to easily attach the flexible member to the tip of the first duct. In this way, it is possible to provide a duct device that can reduce the burden on workers involved in duct connection work.

(2) In (1), the flexible member is such that when the second duct is inserted into the first duct, the open end of the second duct comes into contact with the flexible member and the size of the opening of the first duct is A duct device comprising an inclined surface (for example, an inclined surface 32a) that reduces the distance in the insertion direction of the second duct.

According to the duct device (2), the flexible member is attached to the end of the first duct, so that the opening of the first duct is directed toward the insertion direction of the second duct by the inclined surface of the flexible member. Since the second duct is small, when the second duct is inserted into the first duct, the tip of the second duct first comes into contact with the inclined surface of the flexible member. If the second duct is pushed in and inserted into the back of the first duct, the part of the flexible member that contacts the second duct will be elastically deformed, causing contact between the second duct and the flexible member. The area gradually increases. This makes it possible to reduce the repulsive force that the second duct receives from the flexible member at the beginning of pushing the second duct in, making it easier to insert the second duct into the first duct. In this way, it is possible to provide a duct device that can reduce the burden on workers involved in connecting air conditioning and ventilation ducts.

(3) In (1) or (2), the second duct has an annular protrusion (for example, protrusion 22) that protrudes outward from the side surface, and the protrusion is inserted into the first duct. The duct device is formed at a portion that can come into contact with the open end of the first duct when the second duct is inserted, and is capable of restricting insertion of the second duct.

According to the duct device (3), since the second duct has the annular protrusion projecting outward from the side surface, the second duct has improved rigidity and is less likely to deform. In addition, the protrusion is formed at a portion that can come into contact with the open end of the first duct when inserted into the first duct, and in order to restrict the insertion of the second duct, the second duct is inserted into the first duct more than necessary. It is possible to prevent it from entering the inside of the duct.

(4) In the duct device according to any one of (1) to (3), the second duct further includes a protrusion (for example, the protrusion 24 and the bent part 25), and the protrusion includes: The flexible member is formed at the open end of the second duct on the side that is inserted into the first duct, and when the second duct is inserted into the first duct, the flexible member crosses over the flexible member. A duct device located further back than the

According to the duct device of (4), when the second duct is inserted into the first duct, the protrusion formed at the open end of the second duct passes over the flexible member and the flexible member This makes it possible to position it further back. Therefore, when the second duct moves in the direction of being pulled out from the first duct, the protrusion engages with the flexible member, and further movement of the second duct is restricted. This makes it difficult for the second duct to separate from the first duct.

(5) It is attached to a cylindrical duct (for example, the first duct 10), and when another duct (for example, the second duct 20) is inserted into the duct, the inner surface of the duct A connecting tool (for example, connecting tool 30) made of a flexible member related to any one of the duct devices (1) to (4) that is compressed with the outer surface of the other duct,
A rod-shaped main body (for example, main body part 31),
a groove (for example, groove 33) formed in the main body, extending along the longitudinal direction and fitting into the open end of the duct;
a bulging portion (e.g., bulging portion 32) bulging from a side surface extending along the longitudinal direction and located on a side of the surface on which the groove portion is formed in the main body;

The bulging portion is arranged annularly inside the duct when the main body is attached to the duct by fitting the groove into the open end of the duct,
In the connecting device, the outer surface (for example, the inclined surface 32a) of the bulging portion is inclined so that the opening of the duct becomes smaller toward the back from the open end of the duct.

According to the connector (5), the connector is attached to the open end of the duct, so that the opening of the duct becomes smaller toward the back side due to the inclination of the bulge of the connector. Therefore, when inserting another duct into the duct, the tip of the other duct first comes into contact with the slope of the bulge of the connector. If another duct is pushed in and inserted into the back of the duct, the part of the bulge that contacts the other duct will be elastically deformed, and the contact area between the other duct and the bulge will gradually increase. Become. This makes it possible to reduce the repulsive force that other ducts receive from the flexible member at the beginning of pushing in the duct, making it easier to insert other ducts into the duct. When another duct is inserted into the duct, it is compressed between the inner surface of the duct and the outer surface of the other duct, so that the other duct is supported by the duct via the connector. Furthermore, since the inner surface of the duct and the outer surface of the other duct are sealed by the connector, the duct and the other duct are connected so that the air inside the duct does not leak to the outside. In this way, it is possible to provide a connecting tool that can reduce the burden on workers involved in duct connection work.

(6) The connecting tool according to (5), wherein the bulging portion is hollow.

According to the connector (6), since the bulging portion is hollow, it is easily deformed, and it is easy to insert one duct into another duct.

According to the present invention, it is possible to provide a duct device and a duct connector that can reduce the burden on workers involved in duct connection work.

FIG. 1 is a perspective view showing the appearance of a duct device 1 in an embodiment of the present invention. It is a perspective view showing the state where the 2nd duct 20 is inserted into the duct device 1 in one embodiment of the present invention. FIG. 3 is a perspective view showing the appearance of a connector 30 according to an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a state in which a connector 30 is attached to the first duct 10. FIG. FIG. 3 is a plan view showing a state in which the connector 30 is attached to the first duct 10. FIG. FIG. 3 is a cross-sectional view showing a state in which the second duct 20 is inserted into the first duct 10 to which the connector 30 is attached. FIG. 3 is a plan view showing a state in which the second duct 20 is inserted into the first duct 10 to which the connector 30 is attached. 7 is a sectional view showing a modification of the second duct 20. FIG. 7 is a sectional view showing another modification of the second duct 20. FIG.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of a duct device 1 in an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the second duct 20 is inserted into the duct device 1 according to an embodiment of the present invention. Although the use of the duct device 1 is not particularly limited, it is preferably a duct device placed overhead, such as on a ceiling, such as an air/ventilation duct device.

As shown in FIG. 1, the duct device 1 includes a first duct 10 and a connector 30. As shown in FIG. 2, the duct device 1 is capable of inserting the second duct 20 therein and is capable of supporting the second duct 20.

The first duct 10 and the second duct 20 are made of metal cylindrical members, and the diameter of the first duct 10 is set to be slightly larger than the diameter of the second duct 20. Therefore, it is possible to insert the second duct 20 inside the first duct 10.

An annular protrusion 12 is formed on the side surface of the first duct 10 by compression processing. In this embodiment, the protrusion 12 is formed at the center of the side surface of the first duct 10, in other words at a half-height position. This annular protrusion 12 improves the strength of the first duct 10 and makes it difficult to deform.

An annular protrusion 22 is also formed on the side surface of the second duct 20 by compression processing. In this embodiment, it is formed in a range from the open end of the second duct 20 to a portion corresponding to the height of the first duct 10. In the following description, one open end of the first duct 10 and the second duct 20 will be referred to as a tip, and the other open end will be referred to as a rear end. Further, the diameter of the protrusion 22 in the second duct 20 is set larger than the diameter of the first duct 10. Therefore, when the second duct 20 is inserted into the first duct 10, the tip of the first duct 10 comes into contact with the protrusion 22, and further insertion of the second duct 20 is restricted. Ru.

The connector 30 is attached to the tip of the first duct 10. The connector 30 is made of resin and has flexibility and elasticity. For example, the connector 30 is made of a rubber member or a sponge member. More specifically, as the material for the connector 30, a styrene thermoplastic elastomer resin mixture, a polyolefin thermoplastic elastomer resin, a polypropylene resin, a composition containing polypropylene resin as a main component, etc. can be used.

FIG. 3 is a perspective view showing the appearance of a connector 30 according to an embodiment of the present invention.

The connector 30 includes a main body 31 formed in the shape of a long rod, and a bulge 32 that bulges laterally from the main body 31.

The main body portion 31 is formed into a substantially U-shape when viewed from the front, and includes a groove portion 33 . The groove portion 33 is formed by the bottom surface of the U-shaped interior of the main body portion 31 and both side surfaces of the bottom surface that are opposite to each other in the width direction, and extends in the longitudinal direction. A plurality of ribs 34 are provided upright on both side surfaces of the groove portion 33 .

The rib 34 is formed into a plate shape, and as shown in FIG. 3, the rib 34 is obliquely inclined toward the bottom side. Further, when the main body portion 31 is viewed from the front as shown in FIG. 3, the plurality of ribs 34 on one side of the groove portion 33 and the plurality of ribs 34 on the other side are alternately arranged. The main body part 31 has flexibility that allows the side surfaces to be curved into an arc shape by applying pressure so that both ends in the longitudinal direction are brought closer together.

The bulging portion 32 bulges out from the opposite side of one side of the groove portion 33 in the main body portion 31, as shown in FIG. The bulging portion 32 includes an inclined surface 32a that is inclined from near the U-shaped bent portion of the main body portion 31 toward the tip of the U-shaped portion. Further, the bulging portion 32 includes a rib 35 extending along the inclined surface 32a. The bulging portion 32 is hollow and has a thin wall when viewed from the front, as shown in FIG. 3 . Therefore, the bulging portion 32 can be easily elastically deformed.

Next, attachment of the connector 30 to the first duct 10 will be explained.

First, the length of the connecting tool 30 is adjusted in advance so as to match the circumference of the first duct 10. Next, the groove 33 at one end of the connector 30 is made to face the tip of the first duct 10 so that the bulge 32 of the connector 30 faces inside the first duct 10, and then one end of the connector 30 Push in the part. As a result, one end of the connector 30 fits into the tip of the first duct 10. Thereafter, by pushing in the vicinity of the portion of the connector 30 that fits into the tip of the first duct 10, the groove 33 fits into the tip of the first duct 10 while the connector 30 curves. Then, by fitting the other end of the connecting tool 30 to the tip of the first duct 10, one end surface and the other end surface of the connecting tool 30 come into contact, and the connecting tool 30 becomes annular. This completes the attachment of the connector 30 to the first duct 10.

Note that after the connection tool 30 is attached, a resin sealant may be injected into the groove portion 33 of the connection tool 30 to seal the gap between the first duct 10 and the connection tool 30. Thereby, the connecting tool 30 is firmly fixed to the first duct 10. Furthermore, when the connecting tool 30 is attached to the first duct 10, if one end surface and the other end surface of the connecting tool 30 are separated from each other, the worker must A sealant may be injected in between.

FIG. 4 is a sectional view showing a state in which the connector 30 is attached to the first duct 10. FIG. 5 is a plan view showing a state in which the connector 30 is attached to the first duct 10.
When the connector 30 is attached to the first duct 10 , the tip of the rib 34 is in contact with the inner surface of the first duct 10 inside the connector 30 . Therefore, when an attempt is made to remove the connecting tool 30 from the first duct 10, a repulsive force by the ribs 34 is applied to the connecting tool 30, making it difficult to remove the connecting tool 30 easily. Further, the slope angle of the inclined surface 32a gradually increases from the tip end of the first duct 10 toward the back side, and the opening of the first duct 10 gradually becomes smaller toward the back side.

Next, the connection work between the first duct 10 and the second duct 20 will be explained.

The operation of connecting the first duct 10 and the second duct 20 is completed by inserting the second duct 20 into the opening of the first duct 10 to which the connecting tool 30 is attached.

When the second duct 20 is inserted into the opening of the first duct 10 to which the connector 30 is attached, the tip of the second duct 20 comes into contact with the inclined surface 32a of the bulge 32. When the second duct 20 is further pushed in in this state, the bulging portion 32 is elastically deformed and enters between the first duct 10 and the second duct 20.

FIG. 6 is a sectional view showing a state in which the second duct 20 is inserted into the first duct 10 to which the connector 30 is attached. FIG. 7 is a plan view showing a state in which the second duct 20 is inserted into the first duct 10 to which the connector 30 is attached.

By elastically deforming the bulging part 32 and entering between the first duct 10 and the second duct 20, the space between the first duct 10 and the second duct 20 is sealed by the bulging part 32, and the first duct 10 and the second duct 20 are connected. At this time, the bulging portion 32 is in a compressed state between the first duct 10 and the second duct 20. Therefore, the elastic force of the connector 30 acts in a direction that pushes the outer surface of the second duct 20, and the second duct 20 is supported by the first duct 10 via the connector 30. This makes it difficult for the second duct 20 to separate from the first duct 10, and the first duct 10 and the second duct 20 can be connected without fixing with screws as in the conventional method. Note that when the first duct 10 and the second duct 20 were connected, smoke was allowed to flow inside the duct, and smoke was visually observed to see if it leaked from the connected portion, no smoke leakage was observed.

Further, when trying to pull out the second duct 20 from the first duct 10, the rib 35 tends to enter between the first duct 10 and the second duct 20. Therefore, the pressure from the outside related to the second duct 20 increases, and the frictional force between the connecting tool 30 and the second duct 20 increases. This makes it even more difficult for the second duct 20 to come off from the first duct 10. At least, the second duct 20 did not come off from the first duct 10 due to the force of a person pulling it.

According to the embodiment of the present invention configured as described above, the groove 33 at the end of the connector 30 is fitted into a part of the tip of the first duct 10, and while the main body 31 is curved, By fitting the groove 33 of the connector 30 into the tip of the first duct 10, the connector 30 can be easily attached to the tip of the first duct 10.

Further, by attaching the connecting tool 30 to the distal end of the first duct 10, the opening of the first duct 10 becomes smaller in the insertion direction of the second duct 20 due to the inclined surface 32a of the connecting tool 30. Therefore, when inserting the second duct 20 into the first duct 10, the tip of the second duct 20 first comes into contact with the inclined surface 32a of the connector 30. After that, when the second duct 20 is pushed in and inserted into the back side of the first duct 10, the contact portion of the connecting tool 30 with the second duct, especially the bulging portion 32, is elastically deformed, and the second duct The contact area between 20 and the bulge 32 gradually increases. This makes it possible to reduce the repulsive force that the second duct 20 receives from the connector 30 at the beginning of pushing the second duct 20 in, making it easier to insert the second duct 20 into the first duct 10. Then, when the second duct 20 is inserted into the first duct 10, the bulging portion 32 is compressed between the inner surface of the first duct 10 and the outer surface of the second duct 20, and pushes the outer surface of the second duct 20. An elastic force from the bulge 32 comes to act in the direction. Therefore, the second duct 20 is supported by the first duct 10 via the connector 30. Moreover, since the space between the inner surface of the first duct 10 and the outer surface of the second duct 20 is sealed by the connector 30, the first duct 10 and the second duct 20 are connected so that the air inside the duct does not leak to the outside. Connected. In this way, it is possible to provide an air conditioning/ventilation duct device 1 that can reduce the burden on workers involved in connecting air conditioning/ventilation ducts.

Furthermore, according to the present embodiment, the second duct 20 has the annular protrusion 22 that protrudes outward from the side surface, so that the second duct 20 has improved rigidity and is less likely to deform. Further, the protrusion 22 is formed at a portion that can come into contact with a connecting tool 30 attached to the tip of the first duct 10 when inserted into the first duct 10, and when the second duct 20 is inserted. to regulate. Therefore, it is possible to prevent the second duct 20 from entering the inside of the first duct 10 more than necessary.

Further, according to the present embodiment, since the bulging portion 32 of the connector 30 is hollow, it is easily deformed, and the second duct can be easily inserted into the first duct 10.

Further, according to the present embodiment, the protrusion formed at the tip of the second duct 20 is positioned deeper than the connecting tool 30 by climbing over the connecting tool 30 when inserted into the first duct. Therefore, when the second duct 20 moves in the direction of being pulled out from the first duct 10, the protrusion 24 engages with the connector 30, and further movement of the second duct 20 is restricted. This makes it difficult for the second duct 20 to separate from the first duct 10.

Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments. For example, as shown in FIG. 8, a protrusion 24 that protrudes outward may be formed at the tip of the second duct 20. A plurality of protrusions 24 are formed by, for example, press working. In the example shown in FIG. 8, protrusions 24 are formed at eight locations, and adjacent protrusions 24, 24 are arranged at positions of 45 degrees with respect to the center of the circle. The protrusion 24 is formed by making a circumferential cut in the tip of the second duct 20 and bulging the vicinity of the tip of the second duct 20 outward with respect to the cut. The second duct 20 has an inclined surface that slopes upward from the side surface toward the cut.

When the second duct 20 configured in this way is inserted into the first duct 10, the inclined surface of the protrusion 24 comes into contact with the outer surface of the bulge 32, and the protrusion 24 climbs over the bulge 32. It is positioned deeper than the bulge 32. Therefore, when the second duct 20 moves in the direction of being pulled out from the first duct 10, the protrusion 24 engages with the bulge 32, and further movement of the second duct 20 is restricted. This makes it difficult for the second duct to separate from the first duct.

Note that instead of the protrusion 24, as shown in FIG. 9, a bent portion 25 that is folded back outward in a J-shape may be formed at the tip of the second duct 20. The bent portion 25 is formed by extending a portion of the tip of the second duct 20 in the direction of the central axis, and folding back the vicinity of the base of this extended portion into a J-shape. In the example shown in FIG. 9, bent portions 25 are formed at four locations, and adjacent bent portions 25, 25 are arranged at 90 degrees with respect to the center of the circle.

When the second duct 20 configured in this manner is inserted into the first duct 10, the bent portion 25 crosses over the bulge 32 and is positioned deeper than the bulge 32. At this time, the bent portion 25 which had been elastically deformed returns to its original state, and the tip of the bent portion 25 faces the bulged portion 32 . Therefore, when the second duct 20 moves in the direction of being pulled out from the first duct 10, the tip of the bent portion 25 is caught on the bulging portion 32, and further movement of the second duct 20 is restricted. Ru. This makes it difficult for the second duct to separate from the first duct. Note that the shapes of the protruding portion 24 and the bent portions 25, 25 are not limited to those described above, and the point is that the shapes of the second duct 20 are easy to get over the bulging portion 32 when the second duct 20 is inserted, and after getting over the bulging portion 32. Any shape that can be engaged with the bulge 32 when the second duct 20 is pulled out is applicable.

Moreover, although the first duct 10 and the second duct 20 shown in FIG. 2 are cylindrical, they may be square cylinders. The shapes of the first duct 10 and the second duct 20 may also be an L-shaped elbow or a T-shaped branch pipe. Moreover, the diameter of one end side and the diameter of the other end side may be different, and the duct may have the functions of both the first duct 10 and the second duct 20. In short, if the duct has a cylindrical part into which another duct is inserted, it can be the first duct 10, and if it has a cylindrical part to be inserted into the other duct, it can become the second duct 20. . Further, the lengths of the first duct 10 and the second duct 20 can also be set as appropriate.

Further, a string-like member that serves as a guide for the length to be inserted into the first duct 10 may be wrapped around a predetermined portion of the side surface of the second duct 20. This allows the worker to easily understand how far the second duct 20 should be inserted into the first duct 10. Moreover, it becomes possible to give the function of the protrusion 22 to the string-like member.

Further, according to the air conditioning/ventilation duct device 1 shown in FIG. A fixture 30 may also be attached. Thereby, it becomes possible to connect the first duct 10 and the second duct 20 alternately to form a long duct.

In addition, those in which a person skilled in the art appropriately adds, deletes, or changes the design of the above-mentioned embodiments and each modification, or adds or omits a process, or changes the conditions, As long as it has the gist of the present invention, it is included within the scope of the present invention.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited thereto.

<Construction of duct device 1>
The duct device 1 described in this embodiment, that is, the duct device 1 having the specifications shown in FIGS. 1 to 7 was constructed.

<Evaluation>
[Checking connection strength]
The position of the first duct 10 was fixed, and an adult male pulled the second duct 20. As a result, the second duct 20 did not come off from the first duct 10 even with the pulling force of an adult male.

[Check for smoke leakage]
The first duct 10 and the second duct 20 were connected, smoke was allowed to flow inside the duct, and it was visually observed whether smoke leaked from the connected portion. As a result, no smoke leakage was observed.

1 Air conditioning/ventilation duct device 10 First ducts 12, 22 Projections 20 Second duct 24 Projections 25 Bent portions 30 Connectors 31 Main body 32 Swelling portion 32a Slanted surface 33 Grooves 34, 35 Ribs

(1) A first duct (for example, first duct 10) formed in a cylindrical shape,
When a second duct (for example, second duct 20) formed in a cylindrical shape is attached to the open end of the first duct and inserted into the first duct, the inner surface of the first duct and the second duct are inserted into the first duct. a flexible member (e.g., connector 30) compressed between the outer surface of the second duct;
The flexible member includes a rod-shaped main body (e.g., main body part 31) and a groove part (e.g., groove part 33) formed in the main body, which extends along the longitudinal direction and fits into the open end of the first duct. ), a bulging portion (e.g., bulging portion 32) that bulges out from a side surface that is located on the side of the surface on which the groove portion is formed in the main body and extends along the longitudinal direction; a rib portion (for example, a rib 35), and the groove portion is fitted into the open end of the first duct while curving the main body ,
When the main body is attached to the first duct by fitting the groove into the open end of the first duct, the bulging portion is arranged in an annular shape inside the first duct, and the bulging portion is arranged in an annular shape inside the first duct. The outer surface of the exit part is sloped so that the opening of the duct becomes smaller toward the back from the opening end of the duct (for example, sloped surface 32a),
In the duct device, the rib portion extends along an inclination on an outer surface of the bulged portion .

According to the duct device (1), when the second duct is inserted into the first duct, the flexible member is compressed between the inner surface of the first duct and the outer surface of the second duct, and the second duct is compressed between the inner surface of the first duct and the outer surface of the second duct. Since the elastic force from the flexible member acts in a direction that pushes the outer surface, the second duct is supported by the first duct via the flexible member. Moreover, since the space between the inner surface of the first duct and the outer surface of the second duct is sealed by the flexible member, the first duct and the second duct are connected so that the internal air does not leak to the outside. Further, the groove at one end of the flexible member is fitted into the open end of the first duct, and while the flexible member is curved, the groove at the end of the flexible member is fitted into the open end of the first duct. By fitting the flexible member into the first duct, it becomes possible to easily attach the flexible member to the tip of the first duct. In this way, it is possible to provide a duct device that can reduce the burden on workers involved in duct connection work.
Furthermore, since the flexible member is attached to the end of the first duct, the opening of the first duct becomes smaller toward the insertion direction of the second duct due to the inclined surface of the flexible member. When inserting the duct into the first duct, the tip of the second duct first comes into contact with the inclined surface of the flexible member. If the second duct is pushed in and inserted into the back of the first duct, the part of the flexible member that contacts the second duct will be elastically deformed, causing contact between the second duct and the flexible member. The area gradually increases. This makes it possible to reduce the repulsive force that the second duct receives from the flexible member at the beginning of pushing the second duct in, making it easier to insert the second duct into the first duct. In this way, it is possible to provide a duct device that can reduce the burden on workers involved in connecting air conditioning and ventilation ducts.

(2) The duct device according to (1), wherein the rib portion is located deeper than the main body when the second duct is inserted into the first duct.

(5) It is attached to a cylindrical duct (for example, the first duct 10), and when another duct (for example, the second duct 20) is inserted into the duct, the inner surface of the duct A connecting tool (for example, connecting tool 30) made of a flexible member related to any one of the duct devices (1) to (4) that is compressed with the outer surface of the other duct,
A rod-shaped main body (for example, main body part 31),
a groove (for example, groove 33) formed in the main body, extending along the longitudinal direction and fitting into the open end of the duct;
a bulging portion (for example, a bulging portion 32) bulging from a side surface extending along the longitudinal direction and located on a side of the surface on which the groove portion is formed in the main body;
A rib part (for example, rib 35) extending from the bulge part ,
The bulging portion is arranged annularly inside the duct when the main body is attached to the duct by fitting the groove into the open end of the duct,
The outer surface (for example, the inclined surface 32a) of the bulging portion is inclined such that the opening of the duct becomes smaller toward the back from the opening end of the duct ,
The rib portion extends along the slope of the outer surface of the bulged portion .

Claims (6)

a first duct formed in a cylindrical shape;
between the inner surface of the first duct and the outer surface of the second duct when the second duct, which is attached to the open end of the first duct and has a cylindrical shape, is inserted into the first duct; a flexible member compressed by the
The flexible member includes a rod-shaped main body and a groove formed in the main body, extending along the longitudinal direction and fitting into the open end of the first duct, and bending the main body. A duct device, wherein the groove portion is fitted into an open end portion of the first duct while the groove portion is rotated. The flexible member is configured such that when the second duct is inserted into the first duct, the open end of the second duct comes into contact with the flexible member, and the size of the opening of the first duct is adjusted in the insertion direction of the second duct. The duct device according to claim 1, having an inclined surface that decreases towards the end. The second duct has an annular protrusion projecting outward from the side surface, and the protrusion is located at a portion that can come into contact with the open end of the first duct when inserted into the first duct. The duct device according to claim 1 or 2, wherein the duct device is configured such that insertion of the second duct can be restricted. The second duct further includes a protrusion,
The protrusion is formed at an open end of the second duct on the side that is inserted into the first duct, and when the second duct is inserted into the first duct, the protrusion crosses over the flexible member. The duct device according to claim 1 or 2, wherein the duct device is located deeper than the flexible member. The flexible member is attached to a cylindrical duct and is compressed between the inner surface of the duct and the outer surface of the other duct when another duct is inserted into the duct. A connecting tool,
A rod-shaped body,
a groove formed in the main body, extending along the longitudinal direction and fitting into the open end of the duct;
a bulging portion that bulges out from a side surface that extends along the longitudinal direction and is located on a side of the surface on which the groove portion is formed in the main body;
The bulging portion is arranged annularly inside the duct when the main body is attached to the duct by fitting the groove into the open end of the duct,
The outer surface of the bulging portion is inclined such that the opening of the duct becomes smaller toward the back from the open end of the duct. 6. The connector according to claim 5, wherein the bulge is hollow.

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