JP5476009B2 - Tubular universal joint - Google Patents

Description

  The present invention relates to a cylindrical universal joint that can be freely oriented in an arbitrary piping direction such as a substantially straight pipe shape or a curved pipe shape, and in particular, is connected to a connection exhaust port of a ventilator and a wall portion of a building. The present invention relates to a cylindrical universal joint effective for connection to an exhaust port.

Ventilators for indoor ventilation are known to have an opening on the wall of the building, and a wall-mounted type that can be directly attached to the opening, or an installation type that is installed inside the ceiling or wall. . In recent years, installation types have become mainstream. In this installation type ventilator, connection to an external exhaust port attached to a wall of a building is performed using an elbow pipe or a bellows pipe formed integrally.
In other words, depending on the opening direction of the connection exhaust port on the installation type ventilator side, due to the relationship with the mounting position of the external exhaust port on the wall, misalignment occurs in the connection direction between the connection exhaust port and the external exhaust port, It may not match. In this case, either the elbow pipe or the bellows pipe, or a combination of the elbow pipe and the bellows pipe is used to connect the connection exhaust port and the external exhaust port.

By the way, the elbow pipe is effective as a pipe joint for indoor ventilation because there is no unevenness on the inner surface that obstructs the flow of air, but because it is a pipe joint having a fixed bending angle such as 90 °, Depending on the misalignment of the direction (center misalignment angle) and the like, not only the work becomes very difficult, but the elbow pipe alone may not be able to cope with it. In this case, it is often performed by using a combination with a bellows tube having flexibility in a direction or a single bellows tube.
In this way, the bellows pipe can be adjusted smoothly and smoothly with respect to misalignment in the connection direction between the connection exhaust port and the external exhaust port. I can say that. However, the bellows pipe has a problem that a smooth circulation of room air cannot be expected, such as a high ventilation resistance, because fine irregularities exist on the inner surface of the pipe.
In particular, when bellows pipes are used for the external piping of range hoods that exhaust contaminated air generated during cooking to the outdoors, the fat and oil contained in the contaminated air is projected to uneven projections. Repeating this collision makes it easier for oil and fat to accumulate in the pipe, which is undesirable in terms of fire safety.

Therefore, in order to solve such a problem, the inner peripheral surface does not have irregularities existing in the pipe direction at a fine pitch like a bellows pipe, and the flexibility to adjust the misalignment with respect to the connection direction is provided. Proposed joints for ventilation (see, for example, Patent Document 1)
The vent joint includes a connection port portion connected to a pipe end portion of a connection pipe by band fastening or the like, end members on both sides having semicircular ridges connected to the connection port portion, and end members on both sides The intermediate member is formed by connecting two-way semicircular ridges in the respective connecting directions that are fitted and connected to the semicircular ridges of the both end members.
As a result, the semicircular ridges of the end members on both sides and the semicircular ridges of the intermediate member are pivotally connected so that the connection ports of the end members on both sides are coaxial with the connection direction to the connection pipe. It has flexibility to adjust the alignment on the core, and the entire length can be changed depending on the number of intermediate members connected between the end members on both sides.

Japanese Utility Model Publication No. 8-525

By the way, as shown in FIG. 1 and FIG. 2 after correction, for example, the conventional technology described in Patent Document 1 is an end formed so as to overlap in the same flange part (end face) form in relation to inside and outside. This is a connecting structure in which the female semicircular ridges of the members are fitted and connected so as to cover the male semicircular ridges of the intermediate member.
For this reason, it is necessary to load a sealing material such as an O-ring for sealing between the male and female collars between the mating overlapping portions of both male and female semicircular baskets. It was time consuming.
For example, at the installation site of a range hood, a fitting connection using a plurality of intermediate members performed according to the connection length of the connection exhaust port of the hood part attached to the indoor wall surface and the external exhaust port attached to the wall part There were problems in handling such as troublesome and time-consuming work.

  In the prior art, in addition to the end members on both sides, two different types of female intermediate members and male intermediate members must be manufactured on the manufacturing surface. Further, since a sealing material such as an O-ring that fills the space between the mating overlapped parts is required as an essential part, the cost is increased due to an increase in material costs and processing costs.

  Therefore, the present invention has been developed to solve the above-mentioned problems, and it is possible to adjust the direction with respect to the misalignment in the connecting direction and to change the length, and to connect the plurality of members having the same shape in the cylinder direction. To provide a cylindrical universal joint having flexibility, which is made possible by an operation of turning each member in the circumferential direction at the time of butt connection, and which further smoothes the inner surface of the pipe and reduces flow resistance. is there.

In order to solve the above-described problems, the present invention provides a tubular universal joint formed by connecting a plurality of tubular members each having a connection port to be butt-connected at both ends, the tubular member including the both ends. The connection ports are each formed into a substantially V shape in a side view in the cylindrical direction, which is cut into an oblique ring shape, and each of the connection ports is provided with a butt connection portion, and the butt connection portion is a regular polygon. The formed portion excluding the butt connection portion is formed in a circular tubular shape, and the tubular member is formed in a curved tubular shape in which a tube wall is bent in a desired arc shape, and the butt connection portion is A butt contact portion formed on the one connection port side, a butt fitting portion formed on the other connection port side and fitted and connected to the butt contact portion, and the butt contact portion is An outward ring shape from the opening periphery of the one connection port An abutting surface portion and a polygonal inner shield surface portion provided from the outer peripheral edge of the abutting surface portion are formed in a substantially L shape in a sectional view, and the butt fitting portion is formed on the other connecting port. A substantially L-shaped section in cross-section from a seat surface portion that is provided in an outward ring shape from the periphery of the opening and the abutment surface portion abuts against and a polygonal outer shield surface portion provided from the outer periphery of the seat surface portion. The inner shield surface portion and the outer shield surface portion are regular polygons having the same number of corners, and the number of corners is 15 or more .

In the present invention, a tubular universal joint is formed by connecting a plurality of tubular members each having a connection port to be butt-connected at both ends. Jo is formed in a substantially V-shape in a side view of the cut cylinder direction, and wherein each comprise two connecting opening to the butt coupling portion, further, the butt connection portion is formed in a regular polygon, the butt The portion excluding the connecting portion is formed in a circular tubular shape, the tubular member is formed in a curved tubular shape in which a tube wall is bent in a desired arc shape, and the butt connecting portion is butt connected in a cylindrical shape. Among the tubular members adjacent to each other in the cylindrical direction, the butt contact portions formed at both connection ports on the one tubular member side and the one tubular members respectively formed on both connection ports on the other tubular member side The butt contact part of the member is fitted A butt fitting portion to be connected, the butt contact portion being a polygonal shape provided from a contact surface portion provided in an outward ring shape from the opening peripheral edge of the one connection port, and an outer peripheral edge of the contact surface portion And the abutting fitting portion is provided in an outward ring shape from the peripheral edge of the opening of the other connecting port, and the abutting surface portion abuts against and abuts. And a polygonal outer shield surface portion provided from the outer peripheral edge of the seat surface portion, and is formed in a substantially L shape in a sectional view, and the inner shield surface portion and the outer shield surface portion have the same number of corners. It is a regular polygon, and the number of corners is 15 or more .

Also, the inner shield surface, the formed outer peripheral edge of the contact face portion outwardly inclined, the outer shield surface portion is substantially so as to wrap the inner shield surface from the outside of the outer periphery of the seat surface portion the same It is preferable to form an outward slope at an inclination angle.
Furthermore, it is preferable that the outer shield surface portion further includes a fixing means for fixing the butt contact portion at least unmovably at the circumferential end of the outer shield surface portion, and the fixing means includes the outer shield surface portion. Inward locking piece portions and inward bending caulking piece portions respectively provided at essential points of the circumferential end portion of the outer shield surface, or inward locking provided at essential points of the circumferential end portion of the outer shield surface portion It is preferable that the one part and a separately formed clip member are used.

According to such a configuration, when connecting a plurality of tubular members formed in a substantially V shape in a side view in the cylindrical direction by cutting both connection ports to be butt-connected into a diagonal ring shape in a cylindrical shape. Next, the tubular members are sequentially butt-connected by turning in the circumferential direction. Thereby, the pipe inner surface is smooth, and it is possible to arbitrarily connect and configure a cylindrical universal joint such as a straight pipe form, an elbow form, a twisted form, or a substantially U-shaped form or a substantially C-shaped form.
For example, in the case of constituting an elbow-shaped cylindrical universal joint, when a plurality of tubular members are butt-connected, one tubular member adjacent in the tubular direction is shortest in the tubular direction (longest tubular portion). The tubular member of the elbow shape is formed by sequentially butting and connecting the tubular members so that the tubular direction shortest part side (cylindrical longest part side) of the other tubular member is positioned in the tubular direction at one place in the circumferential direction. It can be a universal joint. In this case, the number of connections of the tubular members is determined in relation to the substantially V-shaped angle θ between the two connection ports that are cut in the shape of a diagonal ring of the tubular members. For example, when the substantially V-shaped angle θ of each tubular member is 30 °, the 90 ° elbow-shaped cylindrical universal joint is connected by butt-connecting the three annular members as described above. Can be configured.

In addition, the butt connection between the two connection ports of the plurality of tubular members is formed so that the butt contact portion on one connection port side formed in a substantially L shape in a sectional view is also formed in a substantially L shape in a sectional view. This can be easily performed by fitting to the butt fitting portion on the other connecting port side.
Moreover, the tubular members adjacent in the cylindrical direction by the butt fitting between the inner shield surface portion formed in the regular polygon of the butt contact portion and the outer shield surface portion formed in the regular polygon of the butt fitting portion. The butt connection state is kept non-rotatable.
That is, it is possible to smoothly perform the adjustment work for the misalignment in the piping direction in a state where the plurality of tubular members are butt-connected in a tubular shape. For example, an elbow or direct connection from a connection exhaust port of a ventilation device such as a range hood that sucks and captures contaminated air generated during cooking to an external exhaust port that is installed on the wall of the building and exhausts the contaminated air to the outside. When the tubular universal joints are connected and configured using a number of tubular members corresponding to the dimensions (distance) achieved by the tube form, the twisted form, or a combination of these forms, the elbow form by butt connection of each tubular member, The straight tube form and the twisted form are held by the butt fitting of the inner shield surface part and the outer shield surface part formed in a regular polygon.

Further, the two connection ports to be butt-connected can be brought into close contact with each other with high sealing properties by the inner shield surface portion on the butt contact portion side and the outer shield surface portion on the butt fitting portion side.
Furthermore, the bent caulking piece portion provided on the outer shield surface portion side is bent and caulked to the inner shield surface portion side, so that the inner shield surface portion is sandwiched. Alternatively, by fastening the inner shield surface portion and the outer shield surface portion so as to be sandwiched between the clip members, both the connection ports are formed by this fastening portion and the inwardly engaging piece portion provided on the outer shield surface portion side. It can be connected so that it cannot be pulled out.

  In the present invention, in the state where a plurality of the tubular members are butt-joined in a cylindrical shape, a connection port member connected to one or both of the tubular members located at both ends in the cylindrical direction is provided. To do. Here, the connection port member may be of the same diameter as that of the annular member, or may be different in diameter such as larger or smaller than the diameter of the tubular member. Moreover, the said connection port member can be set as the structure provided with the tubular member integrally.

According to such a configuration, for example, because the piping distance between the connection exhaust port of a ventilator such as a range hood and the external exhaust port attached to the wall of the building is long, the cylinder connected to the connection exhaust port side When using a straight pipe having a desired length and diameter between the cylindrical universal joint and the cylindrical universal joint connected to the external exhaust port side, the diameter of the straight pipe is larger than the diameter of the annular member If the diameter is different, such as small, select a connection port member that has a diameter that can be connected to a straight pipe, and connect the connection port member to the cylindrical direction of both cylindrical universal joints to which the straight pipe is connected. By connecting each end to the tubular member side at one end, piping connection between the connection exhaust port and the external exhaust port is made possible by a combination with the straight tube using the straight tube therebetween.
Also, when installing a new ventilator by reforming, etc., when the diameter of the existing external exhaust port is different, one end of the cylindrical universal joint on the side connected to the external exhaust port in the cylinder direction It becomes possible to cope by connecting the connecting port member to the tubular member side.

In the present invention, in the state where the connection port having the butt contact portion and the connection port having the butt fitting portion are butted together, at least the outer shield surface portion of the butt fitting portion is brought into contact with the butt. A tightening band that presses against the inner shield surface portion of the contact portion is provided.
Here, the fastening band is formed in a substantially trapezoidal shape in a cross-sectional view spreading toward the both open ends, and is formed in a polygonal shape adapted to the regular polygon of the outer shield surface part, and the butt contact part It is preferable that the polygonal end portion of the inner shield surface portion protrudes outward from the polygonal end portion of the outer shield surface portion in a state where the connection port having butt and the connection port having the butt fitting portion are butted. It will be something.

According to such a configuration, the tightening band is wound from the outer circumference of the outer shield surface portion in a state where the one connection port having the butt contact portion and the other connection port having the butt fitting portion are butted. And the outer shield surface portion can be pressed against the inner shield surface portion by tightening the outer shield surface portion with the tightening band.
Thereby, an outer side shield surface part and an inner side shield surface part can be closely_contact | adhered with much higher sealing performance. In addition, both the connection ports of the tubular members to be butt-connected can be connected so as not to be pulled out in a stronger state.

In addition, when the tightening band is formed in a substantially trapezoidal shape in a cross-sectional view spreading toward the both open ends, it is set so as to wrap the butt fitting part and the butt contact part from the outside of the outer shield surface part. By the tightening band, the butt contact portion can be integrally connected to the butt fitting portion. In other words, since the polygon end of the inner shield surface protrudes from the polygon end of the outer shield surface, the butt contact portion is gradually moved in the butt direction with respect to the butt fitting portion by tightening the tightening band. The pressure contact force of the contact surface portion of the butt contact portion against the seat surface portion of the butt fitting portion can be increased.
Thereby, both the connection ports of the tubular member butt-connected by fitting the butt contact portion to the butt fitting portion can be connected so as not to be retractable. The fitting pressure contact force of the butt contact portion to the butt fitting portion can be increased by the tightening force of the tightening band. That is, the contact between the butt contact portion and the seat surface portion of the butt fitting portion is obtained by applying the tight sealing performance between the butt contact portion and the butt fitting portion to the pressure contact between the outer shield surface portion and the inner shield surface portion. The height can be further increased by pressing the surface portion.

According to the present invention, a plurality of tubular members having the same shape, which are substantially V-shaped in a side view in the cylindrical direction and whose butt connection portions or the entire pipes of both connection ports are formed in a regular polygon, are butt-connected in a cylindrical shape. In this case, the pipe inner surface is smooth and substantially straight (straight pipe) form, substantially elbow form, and tubular form such as substantially U-shaped form and substantially C-shaped form. A type universal joint can be connected and configured. Moreover, the cylindrical universal joint of arbitrary length can be connected and comprised by the connection number of the tubular member of the same shape.
That is, as in the prior art, the direction adjustment and the length with respect to the misalignment of the piping direction at the installation site can be made variable without using end members on both sides having different shapes and without using two kinds of intermediate members. It can be set as a cylindrical type universal joint.
This makes it possible, for example, for external piping of a range hood that exhausts contaminated air generated during cooking to the outside, for connection between the connection exhaust port of the hood part and the external exhaust port attached to the wall part, or to the external exhaust port. It is possible to provide a cylindrical universal joint that is effective for connection between the other end of the exhaust duct to which one end is connected and the connection exhaust port of the hood, and that is also effective in handling and fire safety. .

  In addition, since the connection of the plurality of tubular members can be performed by the butt fitting with the butt fitting portion provided on the one connection port side, the butt fitting portion provided on the other connection port side, The connection ports are securely connected to each other on the coaxial core and in close contact with each other with a high sealing performance by the regular polygonal inner shield surface portion on the butt contact portion side and the regular polygon outer shield surface portion on the butt fitting portion side. This eliminates the need for O-rings as in the prior art, improving pipe workability at the installation site of ventilators such as range hoods and reducing costs. A shaped universal joint can be provided.

  In addition, according to the present invention, for example, piping between a straight pipe having a diameter different from that of the annular member and a connection exhaust port of a ventilator such as a range hood and an external exhaust port attached to the wall of the building through the middle When a connection is made, a connection port member having a diameter capable of fitting and connecting the straight pipe is selected, and the connection port member is provided in the tubular member on the straight pipe connection side of the cylindrical universal joint. It is possible to connect the connection exhaust port and the external exhaust port in combination with the above.

  Further, according to the present invention, the tightening band closely contacts the outer shield surface portion and the inner shield surface portion of the both connection ports of the tubular members to be butt-connected and the seat surface portion and the contact surface portion with a higher sealing performance. In addition, it is possible to connect both the connection ports so that they cannot be pulled out in a strong state.

It is a longitudinal cross-sectional view when the straight pipe | tube form of the cylindrical type universal joint which concerns on this embodiment is seen from the side surface of a cylinder direction. 1 shows a tubular member alone, (a) is a longitudinal sectional view, (b) is a perspective view when viewed from one connecting port side, and (c) is viewed from the other connecting port side. FIG. It is a longitudinal cross-sectional view which shows a state when the connection port which has the butt | matching contact part of the other tubular member is butt-connected to the connection port which has the butt fitting part of one tubular member. It is a vertical side view when the elbow form of the cylindrical universal joint is viewed from the side surface in the cylinder direction. It is a side view when each cylindrical form when rotating each tubular member of the cylindrical type universal joint in FIG. 4 in the circumferential direction is viewed from the side in the cylindrical direction, and (a) is the cylindrical type universal joint. 1b shows a cylindrical configuration in which the extension line crossing angle between the one end opening and the other end opening is 60 °, and (b) shows that the extension line crossing angle between the one end opening and the other end opening of the cylindrical universal joint is 30 °. (C) shows a twisted cylindrical form. The example of use of a cylindrical type universal joint is shown, (a) is a perspective view when the ventilator is seen from the front side obliquely upward, and (b) is the same front view. The cylindrical type universal joint which concerns on other embodiment is shown, (a) is a longitudinal cross-sectional view when an elbow form is seen from a cylinder direction side surface, (b) is a perspective view which shows a connection port A member. (C) is a perspective view showing a connection port B member. The example of use of the said cylindrical type universal joint is shown, (a) is a perspective view when a ventilator is seen from front side diagonally upward, (b) is the side view. The other embodiment of the latching means which concerns on this embodiment is shown, (a) is a perspective view which shows a clip member, (b) is a butt | matching contact part and butt fitting part of an annular member by a clip member It is an expanded sectional view of the principal part which shows the state which fixedly connected so that rotation was impossible and was impossible to rotate. It is a longitudinal cross-sectional view when the elbow form of the cylindrical type universal joint which concerns on other embodiment is seen from the side surface of a cylinder direction. It is the XI-XI sectional view taken on the line of FIG. It is a perspective view which shows the fastening band which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a longitudinal sectional view showing a tubular universal joint according to the present embodiment in a straight pipe form, and FIG. 2 is a longitudinal sectional view and a perspective view showing a tubular member alone.

≪Configuration of cylindrical universal joint≫
As shown in FIG. 1, the tubular universal joint A is configured by connecting a plurality of tubular members 1 in a cylindrical manner.
This tubular universal joint A can be freely lengthened by turning each tubular member 1 in a circumferential direction at an appropriate angle to make a butt connection, the number of connected tubular members 1, etc. It can be configured to be connected to an arbitrary tubular form such as a straight pipe form shown in FIG. 4, an elbow form shown in FIGS.

≪Configuration of tubular member≫
The tubular member 1 is formed of a nonflammable material. For example, it is formed using a steel plate made of stainless steel or zinc having a thickness of 0.6 mm or more.
This tubular member 1 is, for example, as shown in FIGS. 6 and 8 to be described later, such as a connection exhaust port 4 provided in a ventilator B such as a range hood that sucks and captures contaminated air generated during cooking and a building It is formed in the diameter of the external exhaust port 5 etc. which are installed in the wall part K and exhausts polluted air outdoors.
And the tubular member 1 is substantially V-shaped in a side view in the cylindrical direction in which the connection ports 1a and 1b at both ends that are butt-coupled in a cylindrical shape are cut into a ring shape at an oblique angle with respect to the tube axis. (Substantially fan-shaped).

Further, as shown in FIGS. 1 and 2, the tubular member 1 is formed in a curved tubular shape in which the tube wall is curved at a desired arc angle. Thereby, as shown to (a) of FIG. 2, the tubular member 1 has the longest curved portion L1 in the cylindrical direction, and is opposite to the longest curved portion L1 in the cylindrical direction on the diagonal line passing through the opening axis of the connection port 1b. It has a substantially V shape in a side view in the cylindrical direction having the cylindrical curved shortest portion L2 at the peripheral surface portion located on the side.
In this embodiment, as shown in FIG. 2A, the connecting ports 1a and 1b at both ends are connected to the tubular member 1 so that the substantially V-shaped angle θ between the connecting ports 1a and 1b at both ends is 30 °. It is open. That is, the tube wall of the tubular member 1 is formed in a curved shape at an arc angle drawn around the intersection P shown in FIG.
Thereby, for example, as shown in FIG. 4 to be described later, the cylindrical longest curve portion L1 side and the shortest cylindrical curve portion L2 side of the three tubular members 1 are positioned in the cylindrical direction at one circumferential direction. By connecting the two connection ports 1a and 1b of each tubular member 1 to each other, the 90 ° elbow tubular universal joint A can be connected.

  Of the two connection ports 1a and 1b of the tubular member 1 formed in a substantially V shape in a side view in the cylindrical direction, one of them (on the left side in FIG. 2A) on the connection edge 1a side of the opening peripheral edge. A butt contact portion 2 that is a butt connection portion is provided, and a butt fitting portion 3 that is a butt connection portion is provided on the opening periphery on the other connection port 1b side (the right side in FIG. 2A).

Thus, the substantially V-shaped angle θ is formed to be 30 ° in a side view in the cylindrical direction, and the butt contact portion 2 is provided on the one connection port 1a side, and the butt contact is provided on the other connection port 1b side. In the tubular member 1 provided with the butt fitting portion 3 that butt-couples the portions 2, the inner shield surface portion 2b that follows the butt contact portion 2 and the outer shield surface portion 3b that follows the butt fitting portion 3 are regular polygons. Are formed respectively.
As a result, when the butt contact portion 2 of the other tubular member 1 is butt-connected to the butt fitting portion 3 of one tubular member 1 that is butt-connected in a cylindrical shape and is adjacent, the other tubular member A state in which the tubular member 1 on the other side is rotated in the circumferential direction at a shift angle corresponding to one frame of the polygon by rotating 1 to shift in the circumferential direction by one side of the polygon (hereinafter referred to as “polygon one frame”) So that they can be butt-connected. Further, the butt fitting portion 3 is held in a stationary state in a state where the butt contact portion 2 is abutted.

≪Configuration of butt contact part≫
As shown in the enlarged view of FIG. 1 and (a) of FIG. 2, the butt contact portion 2 includes a contact surface portion 2a provided in an outward ring shape from the opening periphery of the connection port 1a, and a contact surface portion 2a. It is formed in a substantially L shape in cross-sectional view from the inner shield surface portion 2b provided in an outwardly inclined shape from the outer peripheral edge and in an outwardly inclined shape toward the peripheral wall direction of the tubular member 1. And the inner side shield surface part 2b of the butt | matching contact part 2 is formed in the regular polygon, as shown to (b) and (c) of FIG.

≪Configuration of butt fitting part≫
As shown in the enlarged view of FIG. 1 and FIG. 2, the butt fitting portion 3 is provided in an outward ring shape from the opening periphery of the connection port 1b, and the abutting surface portion 2a on the butt abutting portion 2 side is abutted against. The seating surface 3a to be contacted and the outer shield provided in an outwardly inclined shape toward the opening direction of the connection port 1b at substantially the same inclination angle so as to wrap the inner shielding surface 2b from the outer periphery of the seating surface 3a. From the surface part 3b, it is formed in the substantially L shape by the cross sectional view. And the outer shield surface part 3b of the butt fitting part 3 is formed in the regular polygon of the same number of angles as the inner shield surface part 2b, as shown to (b) and (c) of FIG.

Although the number of regular polygons between the inner shield surface 2b of the butt contact portion 2 and the outer shield surface 3b of the butt fitting portion 3 is not particularly limited, for example, a regular 15 polygon (polygon one frame 24). In the present embodiment, as shown in FIG. 2, the inner shield surface portion 2b and the outer shield surface portion 3b have a regular 36-gon shape.
Thus, when the butt contact portion 2 of the other tubular member 1 is butt-connected to the butt fitting portion 3 of one tubular member 1 adjacent in the cylindrical direction by turning one polygon at a time, the other By rotating the tubular member 1 frame by frame, the other tubular member 1 can be butt-connected while being shifted (rotated) at a rotation angle of 10 ° in the circumferential direction. That is, the misalignment adjustment is possible for a slight misalignment in the piping direction.

  In this way, the polygonal end portion of the outer shield surface portion 3b of the butt fitting portion 3 formed in a regular 36-gon shape is fixed to fix the butt contact portion 2 in a state in which the butt contact portion 2 cannot be removed. Means.

≪Configuration of fastening means≫
The fastening means includes a plurality of tubular members 1 that abut the butting contact portion 2 of one communication port 1a with the butting fitting portion 3 of the other communication port 1b, and connect the cylindrical universal joint A, for example, 4 and FIG. 5 butt contact so that the butt contact portion 2 of each tubular member 1 adjacent in the cylindrical direction does not come off from the butt fitting portion 3 when connected to each tubular form shown in FIGS. The portion 2 is fixed (fixed) to the butt fitting portion 3.
As shown in FIGS. 1 and 2, the fastening means are an inwardly engaging piece 6 and an inwardly crimped piece 7 that are respectively provided at essential points of the polygonal end of the outer shield surface portion 3b.

  As shown in FIGS. 2A and 2C, the inward locking piece portion 6 is formed by bending inwardly in a claw piece shape having a predetermined width from the polygonal end portion of the outer shield surface portion 3b. The outer shield surface portion 3b is provided.

The inner bending caulking piece portion 7 has a predetermined width from the polygon end portion at the polygon end portion of the outer shield surface portion 3b located diagonally from the inward engagement piece portion 6 passing through the opening axis of the communication port 1b. In addition, as shown in the enlarged view of FIG. 1, a sandwiching portion 7a having a length for sandwiching the inner shield surface portion 2b with the outer shield surface portion 3b when the inner bend is crimped, and an inner portion from the sandwiching portion 7a. It is formed from a fixed portion 7b that is continuously bent in a direction.
The fixing portion 7b is formed on the wall surface of the annular member 1 when the inner bending caulking piece portion 7 is bent inward from the state shown in FIGS. 2 (a) and 2 (c) to the state shown in the enlarged view of FIG. Abut to bite.
This prevents the caulking state of the inner bending caulking piece 7 from being inadvertently released. That is, the fixing portion 7b serves as a lock mechanism that locks the inner bending crimping piece portion 7 so that the inner bending crimping piece portion 7 is not cautiously opened from the taut state.

[Description of operation]
Next, a plurality of tubular members in which the inner shield surface portion 2b of the butting contact portion 2 of one connecting port 1a and the outer shield surface portion 3b of the butting fitting portion 3 of the other connecting port 1b are formed in a regular 36-gon shape. The connection of the cylindrical universal joint A using 1 and an example of its use will be briefly described.
FIG. 3 is a longitudinal sectional view showing a state when a connection port having a butt contact portion of the other tubular member is butt-connected to a connection port having a butt fitting portion of one tubular member to be butt-connected. FIG. 4 is a longitudinal side view showing an example of a cylindrical universal joint butt-joined in an elbow shape using three tubular members, and FIG. 5 is based on the elbow shape shown in FIG. It is a side view which shows each cylindrical form when each tubular member adjacent to a cylinder direction from an elbow form turns one polygon and several frames in the circumferential direction, and is butt-connected sequentially. FIG. 6 is a perspective view and a front view showing an example of the use of a cylindrical universal joint. Here, description will be made with reference to FIG. 1 as appropriate.

First, three tubular members 1 are prepared. As shown in FIG. 3, the tubular member 1 is pulled on the inwardly engaging piece 6 of the butt fitting portion 3 of the connection port 1b of one tubular member 1 to be butt-connected in a cylindrical shape. The polygonal end of the butt contact portion 2 of the connecting port 1a of the other tubular member 1 is fitted and inserted into the butt fitting portion 3, and the entire butt contact portion 2 is butt fitted using this insertion portion as a fulcrum. It is inserted into the joint 3 (the state of the two-dot chain line in FIG. 3). At this time, the second tubular member 1 that makes the butt contact portion 2 butt against the butt fitting portion 3 of the first tubular member 1, and the butt fitting portion 3 of the second tubular member 1 On the other hand, the cylindrical tubular butt connection form of each tubular member 1 is obtained by sequentially butting and connecting the third tubular member 1 for abutting the butt contact portion 2 by rotating one polygon and several frames respectively. 4 to 6, the inward caulking piece portion 7 provided on the butt fitting portion 3 side is subjected to inward bending as shown in the enlarged view of FIG. The butt contact portion 2 is fastened and connected to the butt fitting portion 3 so as not to be removed.
Thereby, it has the flexibility which can be freely changed into various cylindrical forms such as the 90 ° elbow form shown in FIG. 4 and the twisted form shown in FIG. 5 respectively, and the outside on the butt fitting part 3 side. A cylindrical universal joint A having a high sealing performance by the contact of the inner shield surface portion 2b on the butt contact portion 2 side with the shield surface portion 3b and having a smooth tube inner surface can be configured.

And the cylindrical type universal joint A comprised by connecting in various cylindrical forms in this way is the number of connected tubular members 1 (in the illustrated example, as shown in FIGS. 6A and 6B). 5), and when the tubular members 1 are butt-connected, the upward adjustment of the ventilator B is achieved by adjusting the direction relative to the misalignment of the connecting direction by rotating each annular member 1 by one polygon and several frames in the circumferential direction. The connection exhaust port 4 and the lateral external exhaust port 5 attached to the wall K of the building can be connected directly by a gentle curve and a twisted form.
Thereby, the contaminated air generated during cooking from the connection exhaust port 4 to the external exhaust port 5 can be smoothly circulated without any distribution resistance and can be exhausted from the external exhaust port 5 to the outside.

≪Configuration of cylindrical universal joint of other embodiment≫
FIG. 7 shows a cylindrical universal joint according to another embodiment in an elbow form, (a) is a longitudinal sectional view of the cylindrical universal joint, and (b) is a cylinder of the cylindrical universal joint. FIG. 8 is a perspective view showing a connection port member butt-coupled to one end side in the direction, (c) is a perspective view showing a connection port member butt-coupled to the other end side in the cylindrical direction of the cylindrical universal joint, FIG. It is the perspective view and side view which show the example of use of the cylindrical type universal joint.
In addition, as shown in FIG. 7, the tubular universal joint A-1 according to the other embodiment is connected to each tubular member 1 located at both ends in the tubular direction of the tubular universal joint A-1. The members (hereinafter referred to as “connection port A member” and “connection port B member”) 9 and 10 are butt-coupled to each other. Since the other components are basically the same as those in the above-described embodiment, the same reference numerals are given to the same components, and redundant description is omitted.

That is, as shown in FIG. 7, the connection port A member 9 and the connection port B member 10 are respectively connected to the tubular member 1 positioned at both ends of the cylindrical universal joint A in the tubular direction.
As shown in FIG. 8, the connection port A member 8 and the connection port B member 9 are formed by connecting the connection exhaust port 4 and the external exhaust port 5 of the exhaust device B to an existing straight pipe C having a desired length and diameter. In the case where the diameter of the straight pipe C is larger or smaller than the diameter of the tubular member 1 and the diameter of the tubular member 1 is different, such as when the diameter is different from the tubular member 1 when connecting via the middle, Each tubular member 1 positioned is butt-connected and used.

  The connection port A member 9 and the connection port B member 10 are formed of a nonflammable material like the tubular member 1. The connection port A member 9 and the connection port B member 10 are formed in a cylindrical shape having a desired width as shown in FIGS. Is formed.

  In addition, although illustration is abbreviate | omitted, the diameter of the connection port A member 9 and the connection port B member 10 is not only with respect to the straight pipe C, but when exchanging the ventilation apparatus B newly in renovation etc. It is optional such as a diameter that can be fitted and connected to an exhaust port or the like.

And the one end opening side of the connection port A member 9 consists of the same form as the butt | matching contact part 2 with which the one connection port 1a side of the tubular member 1 is equipped, as shown in FIG.7 (b). A butt contact portion 2-1 is provided, and is provided on one end opening side of the connection port B member 10 on the other connection port 1b side of the tubular member 1 as shown in FIG. A butt fitting portion 3-1 having the same form as the butt fitting portion 3 is provided.
That is, the inner shield surface portion 2b of the butt contact portion 2-1 and the outer shield surface portion 3b of the butt fitting portion 3-1 are formed in a regular polygon and a regular 36-gon, and the butt fitting portion 3 of the tubular member 1 is formed. The butt contact portion 2 is butt-connected.
Further, an inward locking piece portion 6 that is a fastening means and an inward bending caulking piece portion 7 are provided on the butt fitting portion 3-1 side.

[Description of operation]
Next, the use of the cylindrical universal joint A-1 including any one of the connection port A member 9 and the connection port B member 10 formed as described above will be briefly described. Here, description will be made with reference to FIG. 8 as appropriate.
As shown in FIG. 8, a cylindrical universal joint A-1 connected to the connection exhaust port 4 of the ventilator B and a cylindrical universal joint A-1 connected to the external exhaust port 5 side are prepared. Then, the connection port A member 9 and the connection port B member 10 having a diameter that can be connected to the straight pipe C are butt-coupled to the tubular member 1 at one end in the cylindrical direction of both the cylindrical universal joints A-1.
Next, after connecting the straight pipe C by the connection port A member 9 and the connection port B member 10 of the both cylindrical universal joints A-1, the tubular members 1 of the two cylindrical type universal joints A-1 are wound around. By adjusting the misalignment in the connection direction by turning the polygon one frame and several frames in the direction and sequentially butt-connecting them, the upward connection exhaust port 4 of the ventilation device B and the horizontal direction attached to the wall K of the building An external exhaust port 5 can be connected.
Thereby, when the diameter of the straight pipe C is larger or smaller than the diameter of the annular member 1, the connection port A member 9 and the connection port B member having a diameter that can be connected to the straight pipe C. 10 is prepared, and the connection port A member 9 and the connection port B member 10 are respectively connected to the one end side tubular member 1 of both cylindrical universal joints A-1 to which the straight pipe C is connected. The combination with the pipe C enables pipe connection while adjusting the misalignment between the connection exhaust port 4 of the ventilation device B and the external exhaust port 5 attached to the wall K of the building.
Further, when the new ventilation device B is installed by reforming or the like, the cylindrical universal joint A-1 on the side connected to the external exhaust port is also used when the diameter is different from that of the existing external exhaust port. It is possible to correspond by connecting the connection port A member 9 or the connection port B member 10 to the one end side tubular member 1.

<< Configuration of Fastening Means According to Other Embodiments >>
FIG. 9 is a perspective view showing another embodiment of the fastening means according to this embodiment and an enlarged cross-sectional view of the main part.
In this embodiment, as described above, after connecting one connecting port 1a having the butting contact portion 2 of the tubular member 1 to the other connecting port 1b having the butting fitting portion 3, both connecting ports 1a, An inward locking piece portion 6 provided on the outer shield surface portion 3b of the butt fitting portion 3 of the other connection port 1b, and a clip member formed separately, as a fixing means for fixing 1b so that it cannot be removed 11 and. That is, the outer shield surface portion 3b of the butt fitting portion 3 is provided with only the inward locking piece portion 6 and the inner bending caulking piece portion 7 is not provided.

≪Configuration of clip member≫
As shown in FIG. 9, the clip member 11 includes a pair of sandwiching piece portions 11 a and 11 b. Then, as shown in FIG. 9B, when the inner shield surface portion 2b and the outer shield surface portion 3b are sandwiched between the pair of sandwiching piece portions 11a and 11b, The fixed piece portion 12 that comes into contact with the shield surface portion 2b is cut and raised so as to be inclined.
That is, the fixed piece portion 12 serves as a lock mechanism that locks the clip member 11 so that the clip member 11 is not accidentally detached.

≪Configuration of cylindrical universal joint of other embodiment≫
FIG. 10 and FIG. 11 are longitudinal sectional views showing a cylindrical universal joint according to another embodiment in an elbow form.
The tubular universal joint A-2 according to this other embodiment is tightened as shown in FIGS. 10 and 11 in place of the inward locking piece 6 and the inward bending crimping piece 7. The band 70 is used to improve the sealing performance of both the connection ports 1a and 1b of the tubular member 1 and to connect the both connection ports 1a and 1b so that they cannot be removed. Since the other components are basically the same as those of the above-described embodiment, the same reference numerals are given to the same components, and redundant description is omitted.

  That is, the inward locking piece 6 and the inward bending crimping piece 7 are eliminated from the outer shield surface portion 3b of the butt fitting portion 3 provided on the other communication port 1b side of the cylindrical member 1, and FIG. 10 and FIG. As shown, the outer shield surface portion 3b is tightened from the outside using a tightening band 70 in a state where both the communication ports 1a and 1b are abutted.

≪Configuration of tightening band≫
FIG. 12 is a perspective view showing an example of the fastening band according to the present embodiment. Here, description will be made with reference to FIGS. 10 and 11 as appropriate.
As shown in FIG. 12, the tightening band 70 includes a band portion 70 a and a tightening bolt 70 b that connects the both ends open side of the band portion 70 a so as to be drawn.

As shown in FIGS. 10 and 11, the band portion 70a is long enough to be wound around the entire circumference of the outer shield surface portion 3a along the outer side of the outer shield surface portion 3b. The butt contact portion 2 can be surrounded from the shield surface portion 3b side, and is formed in a substantially U shape in a sectional view.
In the present embodiment, as shown in FIG. 10, the cross-sectional shape of the band portion 70 a is changed from the continuous portion 70 a-1 having a width substantially equal to the cross-sectional width of the outer shield surface portion 3 b of the butt fitting portion 3. It is made into the substantially trapezoid shape which makes it the shape which spreads toward the open end part 70a-2 side. As shown in FIGS. 11 and 12, the continuous portion 70a-1 of the band portion 70a is formed in a polygonal shape adapted to the regular 36-gon shape of the outer shield surface portion 3b.
Thus, the band portion 70a can be quickly set from the outer shield surface portion 3b side to the butt fitting portion 3 to which the butt contact portion 2 is butt-connected. The entire regular 36-sided outer shield surface portion 3b can be uniformly tightened by the polygonal continuous portion 70a-1.

  Furthermore, in addition to the press contact of the outer shield surface portion 3b to the inner shield surface portion 2b, as shown in the enlarged view of FIG. 10, the circumferential end portion 2b-- of the inner shield surface portion 2b from the circumferential end portion 3b-1 of the outer shield surface portion 3b. By tightening the band portion 70a, the butt contact portion 2 is gradually moved in the butt direction with respect to the butt fitting portion 3, and the butt contact portion 3a of the butt fitting portion 3 with respect to the seat surface portion 3a is tightened. The pressure contact force of the contact surface portion 2 a of the contact portion 2 can be increased, and a higher sealing performance can be provided between the butt contact portion 2 and the butt fitting portion 3.

  As shown in FIG. 12, substantially L-shaped tightening linking members 71, 72 are provided on both ends open side of the band portion 70 a in the band direction, and between the tightening linking members 71, 72, respectively. The fastening bolt 70b is formed so as to be screwed in and attached in a penetrating manner.

  The tightening bolt 70b includes a head 70b-1 and a threaded portion 70b-2 extending between the tightening connecting members 71 and 72. A slipper made of knurl or the like is provided on the peripheral surface of the head 70b-1, and a locking recess for a hexagon wrench (not shown) is provided on the protruding end surface of the head 70b-1.

[Description of operation]
Next, the connection of the cylindrical universal joint A-2 including the fastening band 70 formed in this way will be briefly described.
This tubular universal joint A-2 is butt-contacted by rotating the other tubular member 1 in the circumferential direction for one polygon and several frames with respect to the butt fitting portion 3 of one tubular member 1 to be butt-connected. Set so that the band portion 70a of the tightening band 70 is wound from the outer circumference of the butt fitting portion 3 while adjusting the alignment in the piping direction to butt the portion 2, and tighten the band portion 70 with the tightening bolt 70b. .
As a result, the outer shield part 3b of the butt fitting part 3 is pressed against the inner shield surface part 2b of the butt fitting part 2, and the contact surface part of the butt contact part 2 against the seat surface part 3a of the butt fitting part 3 The butt contact portion 2 can be fixedly connected to the butt fitting portion 3 in a state where the butt contact portion 2 cannot be removed in a state where the pressure contact 2a is brought into contact therewith. In other words, the close sealing performance by the butt contact portion 2 and the butt fitting portion 3 is applied to the seat surface portion 3a on the butt fitting portion 3 side in addition to the pressure contact between the outer shield surface portion 3b and the inner shield surface portion 2b. It can be made even higher by the pressure contact of the contact surface portion 2a on the contact portion 2 side.

The specific configuration of the embodiment of the present invention is not limited to the above-described embodiment, and there are design changes and the like without departing from the gist of the present invention described in claims 1 to 14. Are also included in the present invention.
For example, the entire pipe (the entire cylinder direction) of the substantially V-shaped tubular member 1 in a side view including the butting contact portion 2 and the butting fitting portion 3 of both the connection ports 1a and 1b is a regular polygon. As described in detail in the example, it can be formed in a 15-sided shape or a regular 36-sided shape.
Further, the V-shaped angle θ of the tubular member 1 is not limited to 30 ° as described above, and can be formed at 15 °, 25 °, 40 °, 60 °, or the like, for example.

Moreover, as the butt connection portions provided in the both connection ports 1a and 1b of the substantially V-shaped tubular member 1 in a side view in the cylindrical direction, among the tubular members 1 that are butt-connected in the cylindrical shape and are adjacent in the cylindrical direction, Both the connection ports 1a and 1b on the one tubular member 1 side are respectively provided with the above-described butting contact portions 2, and the both connection ports 1a and 1b on the other tubular member 1 side are respectively provided with the above-mentioned butting fitting portions 3 respectively. It can be set as the tubular member 1 of the structure provided.
That is, the tubular member 1 includes a male side tubular member having a butt contact portion 2 at both connection ports 1a and 1b, and a female side tubular member having a butt fitting portion 3 at both connection ports 1a and 1b. These two types of male side tubular members and female side tubular members are alternately butted and connected in the cylindrical direction, so that the straight pipe form and elbow form tubular mold shown in FIGS. 1 and 4 are used. The universal joint A can be connected and configured.

When a tubular universal joint having a desired length is configured by butt-connecting a plurality of tubular members 1 in the tubular direction, the connection exhaust port 4 of the ventilator B, the external exhaust port 5 and the intermediate pipe The cylindrical connection port member described above can be integrally provided on the tubular member 1 located at one or both ends in the cylindrical direction where the fitting connection with the tube C or the like is performed.
In this case, the tubular member 1 provided with the connection port member is butt-connected to one end side or both end sides in the cylinder direction when connecting and configuring the cylindrical universal joint. It is used as a connecting end member that is fitted and connected to the exhaust port 5 and the straight pipe C in the middle of the pipe.

  Furthermore, the inward locking piece portion 6 and the inward bending crimping piece portion 7 can be provided not only in one place on the circumference of the outer shield surface portion 3b but also in several places. For example, inward bending caulking pieces 7 are provided at one place, inwardly engaging piece parts 6 are provided at two places at equal intervals in the circumference, or inward bending caulking pieces 6 are provided at one place. The pieces 7 can be provided at two equal intervals around the circumference. Furthermore, the inward locking piece portion 6 and the inward bending caulking piece portion 7 can be respectively provided at two equal intervals in the circumference.

A, A-1, A-2 Tubular type universal joint 1 Tubular member 1a, 1b Connection port 2 Butt contact part (butt connection part)
2a Contact surface part 2b Inner shield surface part 2b-1 Polygonal end part 3 Butt fitting part (butt connection part)
3a Seat surface portion 3b Outer shield surface portion 3b-1 Polygonal end portion 4 Connection exhaust port 5 External exhaust port 6 Inward locking piece (fixing means)
7 Inner bending caulking piece (fastening means)
8 Rotation knob 9 Connection port A member (connection port member)
10 Connection Port B Member (Connection Port Member)
11 Clip member (fastening means)
70 Tightening band

Claims (11)

A cylindrical universal joint formed by connecting a plurality of tubular members having connection ports at both ends to be butt-connected,
The tubular member is formed in a substantially V shape in a side view in a cylindrical direction in which both the connection ports are cut into oblique ring shapes, and each of the connection ports is provided with a butt connection portion,
Furthermore, the butt connection portion is formed in a regular polygon, and the portion excluding the butt connection portion is formed in a circular tubular shape,
The tubular member is formed in a curved tubular shape in which a tube wall is curved in a desired arc shape,
The butt connection portion is a butt contact portion formed on the one connection port side, a butt fitting portion formed on the other connection port side and the butt contact portion is fitted and connected,
The abutting contact portion is a sectional view from a contact surface portion provided in an outward ring shape from the opening periphery of the one connection port, and a polygonal inner shield surface portion provided from the outer periphery of the contact surface portion. Formed in a substantially L-shape,
The butt fitting portion is formed in an outward ring shape from the opening periphery of the other connecting port, and a seat surface portion with which the abutting surface portion abuts against and a polygonal shape provided from the outer periphery of the seat surface portion. The outer shield surface portion is formed in a substantially L shape in cross-sectional view ,
The inner shield surface portion and the outer shield surface portion are regular polygons having the same number of corners, and the number of corners is 15 or more . A cylindrical universal joint formed by connecting a plurality of tubular members having connection ports at both ends to be butt-connected,
The tubular member is formed in a substantially V shape in a side view in a cylindrical direction in which both the connection ports are cut into oblique ring shapes, and each of the connection ports is provided with a butt connection portion,
Furthermore, the butt connection portion is formed in a regular polygon, and the portion excluding the butt connection portion is formed in a circular tubular shape,
The tubular member is formed in a curved tubular shape in which a tube wall is curved in a desired arc shape,
Of the tubular members that are butt-coupled in a cylindrical shape and are adjacent to each other in the tubular direction, the butt-connecting portions are formed at both connection ports on the one tubular member side, and on the other tubular member side A butt fitting portion that is formed at both connection ports and the butt contact portion of the one tubular member is fitted and connected;
The abutting contact portion is a sectional view from a contact surface portion provided in an outward ring shape from the opening periphery of the one connection port, and a polygonal inner shield surface portion provided from the outer periphery of the contact surface portion. Formed in a substantially L-shape,
The butt fitting portion is formed in an outward ring shape from the opening periphery of the other connecting port, and a seat surface portion with which the abutting surface portion abuts against and a polygonal shape provided from the outer periphery of the seat surface portion. The outer shield surface portion is formed in a substantially L shape in cross-sectional view ,
The inner shield surface portion and the outer shield surface portion are regular polygons having the same number of corners, and the number of corners is 15 or more .   The inner shield surface portion is formed in a regular polygonal shape that is inclined outwardly from the outer peripheral edge of the abutting surface portion, and the outer shield surface portion is externally surrounded by the outer peripheral edge of the seat surface portion so as to wrap the inner shield surface portion from the outside. The cylindrical universal joint according to claim 1 or 2, wherein the cylindrical universal joint is formed in a regular polygonal shape with an inclined direction.   4. The fixing device according to claim 1, further comprising: a fixing unit configured to fix the butt contact portion so as not to be removable at an end of the outer shield surface portion. 5. Tubular universal joint.   5. The cylindrical mold according to claim 4, wherein the fastening means are an inwardly engaging piece portion and an inwardly crimped piece portion respectively provided at essential points of the polygonal end portion of the outer shield surface portion. Universal joint.   The fastening means is a clip member that sandwiches and fastens an inwardly engaging piece portion provided at an essential point of the polygonal end portion of the outer shield surface portion, and the outer shield surface portion and the inner shield surface portion. The cylindrical universal joint according to claim 4.   In a state where the connection port having the butt contact portion and the connection port having the butt fitting portion are butted, at least the outer shield surface portion of the butt fitting portion is set to the inner shield of the butt contact portion. The cylindrical universal joint according to any one of claims 1 to 6, further comprising a tightening band that is pressed against the surface portion.   The tightening band has a substantially trapezoidal shape in a cross-sectional view that widens toward both open end portions, is formed in a polygonal shape that matches the regular polygon of the outer shield surface portion, and has the butt contact portion. In a state where the connection port and the connection port having the butt fitting portion are butted together, the polygonal end portion of the inner shield surface portion protrudes outward from the polygonal end portion of the outer shield surface portion. The cylindrical universal joint according to claim 7.   The connection port member is provided in one or both of the said tubular member located in the both ends of a cylinder direction in the state which carried out the butt connection of the said tubular member in multiple shapes, The connection port member is provided. The cylindrical universal joint according to any one of claims.   The tubular universal joint according to any one of claims 1 to 9, wherein the tubular member is configured in an elbow shape by connecting three of the tubular members.   The tubular universal joint according to any one of claims 1 to 10, wherein the tubular member is made of a noncombustible material.

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