JP3537647B2 - Pipe body connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure such as a connecting portion between a discharge port pipe of a fan case of a backpack power spreader and a flexible pipe, and more particularly, to a pipe connecting two pipe bodies to each other. The present invention relates to a pipeline connection device that is rotatably connected while holding a seal.

[0002]

2. Description of the Related Art In a backpack power spraying machine, an operator holds a spraying agent tank and a fan case on a back while holding a spray tube and sprays a spraying agent or the like from a spray head at a tip portion of the spray tube. The spraying agent is conveyed by the compressed air, and is sent to the jet head from the discharge port of the fan case through the curved pipe, the serpentine pipe, and the jet pipe. The outlet pipe of the fan case is usually provided downward on the side of the fan case, while the jet head is moved in various directions in front of the operator, so that a bent pipe (usually a serpentine pipe) is used. Is separate from.)
The fan case is rotatably connected to a discharge port pipeline of the fan case while holding a seal.

[0003] In a conventional backpack power spreader, a bent case is attached to a discharge port of a fan case by dividing the fan case into front and rear halves, and an O-ring is fitted to an upper end portion. This is performed by sandwiching a curved tube between the front and rear halves of the fan case after the assembly of the other components is completed, and joining the two halves to each other.

[0004]

In a conventional backpack power spreader, a curved pipe is connected to a discharge port pipe of a fan case.
The assembling operation is complicated because the fan case after the assembly of the predetermined parts is completed, that is, each half of the fan case having an increased size and weight is moved. Separation of the bent pipe from the outlet pipe of the fan case
It is necessary to disassemble the fan case into front and rear halves, which is complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a conduit connection device which can efficiently connect and re-separate two conduits rotatably connected to each other while holding a seal therebetween.

[0006]

SUMMARY OF THE INVENTION A conduit connecting apparatus according to the present invention has the following (a) to (f). (A) Inner conduit body (14) (b) Outer conduit having a connection end (22) that fits radially outward from the connection end of inner conduit body (14) and is contractible in the radial direction Body (18) (c) relative rotation applying means (3) for relatively rotating the connection end of the inner pipe body (14) and the connection end (22) of the outer pipe body (18);
(D) a sealing member (36, which seals between the inner pipe body (14) and the outer pipe body (18) while permitting relative rotation between them;
60) (e) A stopper (24) for limiting the axial relative displacement of the inner pipe body (14) and the outer pipe body (18). (F) The connection end (22) of the outer pipe body (18). A radial tightening member (44) for radially inwardly connecting the connection end (22) of the outer pipe body (18) from the outer peripheral side.

The connecting end (22) of the outer pipe body (18) is formed, for example, by increasing or decreasing the width of a slit (32) formed in a part in the circumferential direction.
In addition, by employing an elastic body as a material, the radial direction can be reduced.

The inner conduit (14) and the outer conduit (18) are prevented from being separated by a radial clamping force by a radial clamping member (44) and / or a stopper (24). The seal members (36, 60) interconnect the inner pipe body (14) and the outer pipe body (18) without hindering the relative rotation of the inner pipe body (14) and the outer pipe body (18). Seal. Thus, the inner conduit body (1
4) and the outer pipe body (18), relative rotation imparting means (34, 48, 62)
Are connected while holding the relative rotation by the seal member and the seal by the seal members (36, 60). The connection and disconnection of the inner pipe body (14) and the outer pipe body (18) by this pipe body connection device are as follows:
Move the outer conduit body (18) in the axial direction to
(14), then radially tightening the outer pipe body (18) by the radially tightening member (44), and releasing the radially tightening force of the radially tightening member (44). Pipe body
(18) can be implemented by moving the inner pipe body (14) away from the inner pipe body (14) in the axial direction.Therefore, there is no need to split the outer pipe body (18) into two parts. Connection and disconnection are also efficient.

In the conduit connecting device of the present invention, the relative rotation applying means (34, 62) is provided with a collar (26, 6) which can be reduced in the radial direction.
0), and the collar (26, 60) is in contact with at least one of the inner pipe body (14) and the outer pipe body (18) at the tip of the projection (34, 62).

The contact between the distal end of the convex portion (34, 62) of the collar (26, 60) and at least one of the inner pipe body (14) and the outer pipe body (18) is made by the collar (26, 60). Relative rotation of the inner pipe body (14) and the outer pipe body (18) through relative rotation of at least one of the inner pipe body (14) and the outer pipe body (18), The collars (26, 60) function as relative rotation applying means (34, 62).

In the conduit connecting device of the present invention, the collar (26) that can be contracted in the radial direction is connected to the connecting end (22) of the inner conduit (14) and the connecting end (22) of the outer conduit (18). ), The relative rotation imparting means (48) is provided between the inner pipe body (14) and the outer pipe body (1).
8) formed on at least one of the collars at the tip
The projection (48) is in contact with the inner or outer periphery of (26).

The contact between the tip of at least one of the projections (48) of the inner pipe body (14) and the outer pipe body (18) and the inner circumference or outer circumference of the collar (26) is caused by the inner pipe body ( 14) and through relative rotation of at least one of the outer pipe body (18) and the collar (26), allowing the relative rotation of the inner pipe body (14) and the outer pipe body (18),
Thereby, the convex portion (48) functions as a relative rotation applying means (48).

According to the conduit connecting device of the present invention, the seal member (36, 60) is formed such that the convex portion (36) is formed on the outer peripheral side of the inner conduit (14) or on the inner peripheral side of the outer conduit (18). (42, 74).

The seal member (36, 60) has a convex portion (42, 60) for contact with the outer peripheral side of the inner conduit body (14) or the inner peripheral side of the outer conduit body (18).
74), the inner conduit (1
4) or relative rotation with the inner pipe body (14) or the outer pipe body (18) is maintained while maintaining a seal between the pipe pipe and the outer pipe body (18).

According to the conduit connecting device of the present invention, the stopper (24) is provided at the outer periphery of the inner conduit (14) or the outer conduit (18).
An annular groove formed in the inner circumference of the
(24).

The annular groove (24) serving as the stopper (24) abuts against the collar (26, 60) in the axial direction at the side wall thereof, whereby the inner pipe body (14) and the outer pipe body (18) are formed. ) Restricts the relative displacement in the axial direction to prevent separation in the axial direction, and also serves as a space for disposing the collar (26, 60). As a result, the structure is simplified.

According to the conduit connecting device of the present invention, the connecting end (22) of the outer conduit (18) can be reduced in the radial direction by the slit (32) extending in the axial direction.

According to the conduit connecting device of the present invention, the inner conduit (14) and the outer conduit (18) are each provided with a power disperser.
The outlet pipe (14) and the serpentine pipe (1) of the fan case (12) of (10)
8).

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a connection portion between a discharge port pipe 14 of a fan case 12 and a flexible pipe 18 of a backpack power spreader 10. The backpack power spreader 10 includes a fan case 12 and
A backpack frame (not shown) is provided with a spray agent tank (not shown) that is disposed above the fan case 12 and stores a spray agent such as a powdery or granular drug. The fan case 12 accommodates an impeller (not shown) therein, and has a discharge port pipeline 14 facing downward on a side portion. The discharge port 16 is a pipe 14 for the discharge port.
At the lower end of the fan case 12 and serves as an outlet of a scroll passage (not shown) for the pressurized air in the fan case 12, and the spraying agent metered and discharged from the spraying agent tank can be guided. It has become. The outer periphery of the lower end of the discharge port pipe 14 is
There is a tapered portion 17 whose diameter gradually decreases downward.
The bellows tube 18 includes a bellows portion 20, a bent portion 21, and a connection end portion 22 in order from the distal end toward the discharge port conduit 14, and is made of an elastic material. The bellows portion 20 is connected at its distal end to a jet tube gripped by an operator, and is elastic.

FIG. 2 is a detailed cross-sectional view of the area of the discharge port line 14 of the fan case 12. The annular groove 24 is formed on the outer peripheral portion of the discharge port pipeline 14 of the fan case 12 adjacent to the tapered portion 17.

FIG. 3 is a perspective view of the cylindrical collar 26 and the rubber band 36 for sealing. 2 and 3, the cylindrical collar 26 has a large-diameter portion 28 and a small-diameter portion 30 connected in the longitudinal direction, and the slit 32 has a wavy non-linear shape.
The cylindrical collar 26 is longitudinally cut at one point in the circumferential direction of 26 to be separated in the circumferential direction. The cylindrical collar 26 is elastically expandable and contractible in the radial direction by increasing and decreasing the width of the slit 32. When the cylindrical collar 26 is fitted into the annular groove 24, the cylindrical collar
26 is expanded to get over the tapered portion 17. The cylindrical collar 26 that has reached the annular groove 24 over the tapered portion 17 is automatically closed and closed by the elastic force, and is fitted into the annular groove 24. The expansion and contraction of the cylindrical collar 26 in the radial direction may not be elastic. In this case, the cylindrical collar 26 is radially contracted in the annular groove 24 by human power. The plurality of annular projections 34 are formed on the inner peripheral portion of the cylindrical collar 26 at predetermined intervals in the axial direction of the cylindrical collar 26, and protrude radially inward. Cylindrical collar
26 contacts the bottom surface of the annular groove 24 at the tip of the annular protrusion 34. The sealing rubber band 36 has a cylindrical portion 38 fitted on the outer peripheral side of the small diameter portion 30 and a cylindrical collar at an end of the cylindrical portion 38.
A projecting portion 40 that projects radially inward along the end face of the small diameter portion 30 and that comes into contact with the bottom surface of the annular groove 24 at the annular convex portion 42 at the distal end. The thickness of the cylinder 38 is cylindrical
26 is substantially equal to the step between the large diameter portion 28 and the small diameter portion 30.

The operation of connecting and assembling the flexible pipe 18 to the discharge port pipe 14 will be described. The fan case 12 is composed of front and rear halves that can be separated from each other, and the front and rear halves are already joined to each other prior to connection of the flexible tube 18. Next, while expanding the cylindrical collar 26, the fan case 12 is passed through the lower end of the discharge port pipe 14 and fitted into the annular groove 24, and then the sealing rubber band 36 is attached to the small-diameter portion of the cylindrical collar 26. Fit into 30. Rubber band 36 for sealing
The annular convex portion 42 is pressed against the bottom surface of the annular groove 24 by the contraction force inward in the radial direction. The rubber band for sealing 36 also
At least the area of the small diameter portion 30 of the cylindrical collar 26 is tightened radially inward. Next, the connection end 22 of the flexible tube 18 is
In order to cover the inner cylindrical collar 26 and the sealing rubber band 36 from the outside in the radial direction, it is fitted on the outside of the discharge port pipe line 14,
Thereafter, the tightening band 44 (FIG. 1) is fitted to the outside of the connection end 22. The tightening band 44 tightens the connection end 22 radially inward from the outer peripheral side. Since the connection end 22 is made of an elastic material and is expandable and contractible in the radial direction, it is compressed inward in the radial direction by tightening the tightening band 44 from the outer peripheral side, and the cylindrical collar 26 and the sealing rubber Tighten band 36 radially inward. Cylindrical collar 26
Is provided with a slit 32, and is compressed radially inward until the width of the slit 32 becomes zero by tightening radially inward from the sealing rubber band 36 and the tightening band 44. It is pressed against the bottom of the groove 24. Since the slit 32 is non-linear, the two ends separated by the slit 32 of the cylindrical collar 26 do not shift in the width direction and the radial direction when they come into contact with each other. The inner diameter of the portion 34 is kept constant, and in a state where the sealing rubber band 36 is mounted on the large-diameter portion 28, the width of the assembly in the width direction of the annular groove 24 is smaller than the width of the annular groove 24. Is also made a little smaller so that the relative rotation between the assembled body and the annular groove 24 is not hindered.

A serpentine pipe to the discharge port line 14 of the fan case 12
In the connection state of 18, the sealing rubber band 36 connects the cylindrical portion 38 to the connection end by the tightening force of the tightening band 44.
While being kept in close contact with the inner peripheral surface of the ring 22, the tip of the annular convex portion 42 of the projection 40 is brought into close contact with the bottom surface of the annular groove 24 by the elastic force of the sealing rubber band 36 itself.
As a result, the seal between the discharge port pipeline 14 and the connection end 22 is maintained. Annular convex part 42 of rubber band 36 for sealing
Although is pressed against the bottom surface of the annular groove 24, the contact is substantially linear contact, so that relative rotation between the annular groove 24 and the cylindrical portion 38 is allowed. In addition, the cylindrical collar 26 is substantially in line contact with the bottom surface of the annular groove 24 at the inner peripheral annular protrusion 34 in the same manner as the sealing rubber band 36, and despite the radially inward tightening force. Since the inner diameter of the annular projection 34 is kept constant, relative rotation with the annular groove 24 is allowed. Therefore, the discharge port pipeline 14 of the fan case 12 and the connection end 22 of the flexible tube 18 rotate relative to each other according to a relative rotational force from the outside.

FIG. 4 is a sectional view of a structure in which the annular convex portion 48 is provided on the annular groove 24 side. The inner peripheral surface of the cylindrical collar 26 is a smooth surface having no annular convex portion, while the bottom surface of the annular groove 24 has a plurality of annular convex portions 34 spaced apart in the width direction of the annular groove 24.
Is formed. The cylindrical collar 26 is strongly pressed against the annular convex portion 48 on the bottom surface of the annular groove 24 by the radially inward tightening force from the tightening band 44 (FIG. 1). Since the contact is substantially linear, i.e. the contact area is small, the annular groove 24 and the cylindrical collar
A relative rotation with 26 is guaranteed.

FIG. 5 shows a cylindrical collar 60 and a rubber band 68 having another structure. The cylindrical collar 60 has a plurality of annular projections 62 spaced apart in the axial direction at the outer periphery. The cylindrical collar 60 also has an inner diameter expanding portion 64 at an end portion on the inner peripheral side on the taper portion 17 side. A rubber band 68 having an elastic contraction force inward in the radial direction includes a cylindrical portion 70 fitted to the bottom surface of the annular groove 24, and a radially outwardly projecting end from the end of the cylindrical portion 70 and an annular shape at the distal end. Overhanging part that is convex part 74
72. The cylindrical collar 60 has an annular groove so that the cylindrical portion 70 of the rubber band 68 is accommodated in the inner diameter expanding portion 64.
Inserted into 24. The tightening band 44 (FIG. 1)
The radially inward tightening force is applied to the outer peripheral surface of the connection end 22 (FIG. 1) of the connection end 22 in spite of the elasticity of the connection end 22. Only at 62 is tightened radially inward to the cylindrical collar 60 with strong force,
At the outer peripheral portion without the annular convex portion 62, the tightening force on the cylindrical collar 60 is reduced. Thereby, the relative rotation between the connection end 22 and the annular projection 62 is allowed. On the other hand, the rubber band 68 has a seal with the bottom surface of the annular groove 24 on the inner peripheral surface and a seal with the inner peripheral surface of the bellows portion 20 on the annular convex portion 74.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a connecting portion between a discharge pipe and a flexible pipe of a fan case of a backpack power spreader.

FIG. 2 is a detailed sectional view of a range of a discharge port pipeline of a fan case.

FIG. 3 is a perspective view of a cylindrical collar and a sealing rubber band.

FIG. 4 is a sectional view of a structure in which an annular convex portion is provided on an annular groove side.

FIG. 5 is a view showing a cylindrical collar and a rubber band having another structure.

[Explanation of symbols]

10 Backpack power spreader (power spreader) 12 fan case 14 Pipe for outlet (inner pipe) 18 Serpentine tube (outer conduit) 22 Connection end (connection end) 24 annular groove (stopper) 26 Cylindrical color (color) 32 slits 34 annular convex part (relative rotation applying means, convex part) 36 Rubber band for sealing (seal member) 42 annular convex part (convex part) 44 Tightening band (radial tightening member) 48 annular projection 48 annular convex part (relative rotation applying means, convex part) 60 Cylindrical collar (seal member) 62 annular convex part (relative rotation applying means, convex part) 74 annular convex part (convex part)

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16L 27/00-27/12 B05B 7/14 F16L 21/06 A01M 9/00

Claims (5)

(57) [Claims] 1. A connection end (a) which is fitted to a connection end of the inner pipe (14) from the outside in the radial direction and which can be contracted in the radial direction. (C) a relative end that allows the connection end of the inner conduit (14) and the connection end (22) of the outer conduit (18) to be relatively rotatable. Rotation imparting means (34, 48, 62); (d) a sealing member that seals between the inner pipe body (14) and the outer pipe body (18) while permitting relative rotation between them. (36, 68), (e) said inner conduit member (14) and said stopper to limit the axial relative displacement of the outer conduit member (18) (24), and (f) said outer conduit member (18 ) Has a radial fastening member (44) for fastening the connection end (22) of the outer pipe body (18) radially inward from the outer peripheral side of the connection end (22); Means (34, 62) are radially reduced or
A huge amount of colors (26,60) are included, and this color (26,60)
Is in contact with at least one of the inner pipe body (14) and the outer pipe body (18) at the tip of a convex portion (34, 62), and the stopper (24) is (14) or formed on the inner circumference of the outer pipe body (18) to form the collar (26, 6).
0) is an annular groove (24) into which the collar (26, 60) extends, and the slit (32) extends in the axial direction.
A pipe body connection device characterized in that it can be reduced or enlarged in the radial direction by means of a pipe. 2. A connection end (a) fitted to the connection end of the inner pipe body (14) from the outside in the radial direction and capable of being reduced in the radial direction. (C) a relative end that allows the connection end of the inner conduit (14) and the connection end (22) of the outer conduit (18) to be relatively rotatable. Rotation imparting means (34, 48, 62); (d) a sealing member that seals between the inner pipe body (14) and the outer pipe body (18) while permitting relative rotation between them. (36, 68), (e) said inner conduit member (14) and said stopper to limit the axial relative displacement of the outer conduit member (18) (24), and (f) said outer conduit member (18 ) Has a radial fastening member (44) for radially inwardly fastening the connection end (22) of the outer conduit body (18) from the outer peripheral side of the connection end (22), and reduces in the radial direction. or enormous freely collar (26), the connection of the inner conduit member (14) Parts and said outer conduit member said connection end (18) interposed between the (22), the relative rotational imparting means
(48) is formed on at least one of the inner pipe body (14) and the outer pipe body (18), and has a collar at a distal end portion.
The stopper (24) is formed on the outer circumference of the inner pipe body (14) or the inner circumference of the outer pipe body (18). a is the collar (2 6) cyclic is fitted grooves (24), said collar (26), that the reduction in radial direction or large are freely by a slit (32) extending in the axial direction A pipe body connection device characterized by the following. 3. The sealing member (36, 68 ) has a tip portion (42, 74) of a convex portion (42, 74) on the outer peripheral side of the inner conduit (14) or the inner peripheral side of the outer conduit (18). The pipe body connection device according to claim 1 , wherein the pipe body connection device comes into contact with the pipe body. 4. The inner pipe body (14) and the outer pipe body
(18), each according to any one of the preceding claims, characterized in that a discharge port conduit of the fan case (12) of the power spreaders (10) (14) and the corrugated tube (18) Pipe body connection device. 5. The slit (32) Is non-linear
The pipe body connection according to any one of claims 1 to 4, wherein
Connection device.