JP2954851B2 - Connection structure of supply and exhaust cylinders - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure of a supply / exhaust tube for a combustion apparatus.

[0002]

2. Description of the Related Art In general, a supply / exhaust passage for a combustion apparatus is extended outside by connecting various supply / exhaust cylinders of a standard product having an appropriate length and shape in order. It is required to be able to connect to and not to get out after connecting.

[0003] As a structure of a connecting portion of a supply / exhaust tube that meets such a demand, for example, in Japanese Patent Application Laid-Open No. 1-255790, a cutout is formed in a part of a receiving port, and a tip portion is formed inside the cutout on the inner peripheral side. A claw made of an elastic body that can protrude is attached by protruding partly outward, a circumferential groove is formed on the outer periphery of the insertion port so that the tip of the claw can engage, and a relief part of the claw is partially formed on the outer periphery of the receiving port. The one in which the formed stop ring is rotatably fitted is disclosed.

[0004] According to the above construction, the stop ring is inserted into the socket while the claw of the socket is fitted into the escape portion of the stop ring and the tip of the claw does not protrude into the inner periphery of the socket. When rotated, the pawl is pressed radially inward at a part other than the escape part of the stop ring, and the tip of the pawl protrudes inside the receiving port, and engages with the circumferential groove of the receiving port, thereby causing The escape is prevented.

It is also known that a cutout formed in the receiving port is provided with a locking tongue protruding from the inner periphery of the receiving port, and a circumferential groove is provided on the outer periphery of the insertion port for engaging the locking tongue.

[0006]

However, in the structure disclosed in the above publication, a stop ring is required separately from the receptacle and the insertion port, and there is a problem that the number of parts increases and the cost increases.

Further, in the case where the locking tongue is provided at the cut end of the receiving port, the locking tongue is exposed on the outer surface of the receiving port, so that the locking tongue may be caught and injured or the locking tongue may be deformed. There is a problem that the engagement with the circumferential groove becomes incomplete, or that when the strong withdrawal force acts, the locking tongue may be displaced and come off.

The present invention has been made in view of the above-mentioned conventional problems, and has only a small number of parts and can be inexpensively constructed only with a socket and a socket.
An object of the present invention is to propose a connection structure of a supply / exhaust tube which can be easily connected and does not come off after connection.

[0009]

In order to achieve the above-mentioned object, the present invention will be described with reference numerals in the drawings. In a connection structure of a supply / exhaust cylinder in which a plurality of supply / exhaust cylinders 4 each having a receiving port 2 and the other end serving as an inlet 3 are sequentially inserted into and connected to each other, a portion near an opening end of the receiving port 2 is provided. A seal member 5 is provided on the circumferential side, and a plurality of inwardly engaging projections 6 are formed in the receiving port 2 at intervals in the circumferential direction so as to bulge out. 2 can engage with the inward engaging projection 6 when the receptacle 2 and the insertion port 3 are relatively rotated in an insertion-fitted state while being able to pass between the inward engaging projections 6 and 6 on the inner circumference. A plurality of possible outward locking projections 7 bulge out of the outlet 3 and the inward engagement projections 6
From the opening end side of the mouth 2 to the back side, it is gradually inclined inward.
By the bulging wall 8 where the next bulging amount becomes large,
The locking projection 7 extends outward from the front end of the insertion opening 3 to the back.
The swelling wall 9 whose swelling amount gradually increases in the direction of inclination
The structure formed by each is adopted.

In the invention according to claim 2 , the receiving port 2 has a first large-diameter portion 10 having a diameter larger than the inner diameter of the cylindrical main body 1 from the back side to the opening end portion, and a diameter larger than that. A second large-diameter portion 11, and the inward engaging projection 6
Is formed on the second large-diameter portion 11 and adopts the configuration according to claim 1 .

Further, in the invention according to claim 3 , by forming the first large-diameter portion 10 in the receiving port 2, an engaging step 12 is formed on the inner peripheral surface of the cylinder body 1, and when fitted inserts spigot 3, claim 1 or tip 13 of the spigot 3 is adapted to abut against the engaging Godan 12
Or 2 is adopted.

Further, in the invention according to claim 4 , the sealing material 5 housed on the inner peripheral side of the receptacle 2 when the receptacle 3 is inserted and fitted into the receptacle 2 on the outer periphery of the receptacle 3. It has the configuration according to any one of claims 1 to 3 formed with an annular projecting portion 14 in contact therewith.

[0013]

According to the first aspect of the present invention, the circumferential positions of the receiving port 2 and the insertion port 3 are positioned so that the locking projections 7 can pass between the engagement projections 6 and 6 and are positioned in the reception port 2. The receptacle 3 is inserted, and then the receptacle 2 and the receptacle 3 are rotated relative to each other to engage the engagement projection 6 with the locking projection 7 from the back side of the receptacle 2 so that the receptacle 2 is The socket 3 is engaged with each other, and both are securely connected.

Further, since the sealing material 5 is provided on the inner peripheral side near the opening end of the receiving port 2, the sealing material 5 is
Both are kept airtight in close contact with the outer peripheral surface of the insertion port 3 to be inserted.

Each of the inward engaging projection 6 and the outward locking projection 7 is formed by swelling walls 8 and 9 which swell in an inclined manner. 7 is formed to have a substantially triangular cross section, and the two bulging walls 8 and 9 perform a tensioning action, and the force of disengagement of the receiving port 2 and the insertion port 3 causes the engaging step between the engaging projection 6 and the locking projection 7. When acting on 6a, 7a, the force is transmitted to the peripheral walls of the receptacle 2 and the outlet 3, that is, the cylinder main body 1 via the bulging walls 8, 9 forming the hypotenuse of the triangle, so that a large exit force is generated. Even when it acts, the engaging projection 6 and the locking projection 7 are not easily deformed, and even if the removal force is large, the removal can be reliably prevented.

According to the invention of claim 2 , the receiving port 2
A first large-diameter portion 10 having a diameter larger than the inner diameter of the cylinder body 1 and a second larger-diameter second portion 10 extending from the inner side to the open end portion.
Since the inward engaging projection 6 is formed on the second large-diameter section 11, the projection of the engaging projection 6 can be made as large as possible. It is possible to increase the area of engagement with the outwardly facing locking projection 7 opposed thereto, thereby stably exerting the engagement force.

According to the third aspect of the present invention, by forming the first large-diameter portion 10 in the receiving port 2, the cylindrical main body 1 is formed.
An engagement step 12 is formed on the inner peripheral surface, and
When the connector 3 is inserted and fitted, the distal end portion 13 of the outlet 3 comes into contact with the engaging step portion 12, so that the amount of insertion of the outlet 3 into the receptacle 2 is regulated, and the receptacle 2 and the Even if an external load is applied in the direction of insertion relative to 3, the mutual insertion position can be maintained, and the connection portion of the supply / exhaust tube can be stably held from this surface without rattling.

According to the fourth aspect of the present invention, when the outlet 3 is inserted and fitted to the outer periphery of the outlet 3 when the outlet 3 is fitted, the seal member 5 housed on the inner peripheral side of the receiver 2 is brought into contact with the seal member 5. Since the annular projection 14 is formed, the outlet 3
Is inserted, the annular projection 14 comes into contact with the sealing material 5,
As a result, the insertion amount of the outlet 3 into the receptacle 2 is regulated, and even if an external load is applied to the receptacle 2 and the outlet 3 in the relative insertion direction, the insertion positions of the receptacle 3 and the receptacle 3 can be maintained. In combination with the structure of the fourth aspect, the connection portion of the supply / exhaust cylinder can be stably held without rattling.

Further, the annular projection 14 allows the receiving port 2
Even if the inner circumference of the hole is formed to a diameter through which the locking projection 7 can pass, relative displacement between the receiving port 2 and the insertion port 3 in the radial direction can be prevented, stable sealing performance can be secured, and the opening of the receiving port 2 can be further secured. Since there is no gap at the end, there is no danger of the operator's finger tip being caught, and an excellent appearance is exhibited.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the connection structure of a supply / exhaust cylinder according to the present invention will be described below with reference to FIGS.

1 and 2, reference numeral 1 denotes a cylinder main body of a supply / exhaust cylinder. One end of the cylinder main body is provided with a receiving port 2, the other end is provided with a port 3, and the receiving port 2 is provided with a port 3 The plurality of supply / exhaust pipes are connected to each other by inserting and fitting. The receiving port 2 and the outlet 3 are provided at both ends of the straight tubular supply / exhaust cylinder 4A shown in FIG. Also, a curved tubular supply / exhaust cylinder 4 shown in FIG.
Also in FIG. 6B, the receiving port 2 and the receiving port 3 are provided at both ends, and in the distal end tube 4C shown in FIG. 6, the receiving port 2 is provided at the base end. A lath net 16 is provided to prevent this.
The intermediate portion of the sheet stack 1 4 A and the leading end cylinder 1 4 C songs tubular has a bellows tube portion 17 is formed to be bent.

The receiving port 2 has a diameter larger than the inner diameter of the cylinder main body 1.
A first large-diameter portion 10 having an inner diameter to which the front end portion 13 of the insertion opening 3 just fits, and a second large-diameter portion 11 larger in diameter than the first large-diameter portion 10 and formed on the opening end side. Consists of Then, the vicinity of the opening end of the second large-diameter portion 11 of the receiving port 2 is annularly swelled toward the outer periphery to form a swelled portion 15, and an annular groove 18 is formed on the inner periphery thereof. O-ring 5 as
The second large-diameter portion 11 is formed with a pair of inward engaging projections 6 bulging at a position at an appropriate distance from the end of the second large-diameter portion.

This inwardly engaging projection 6 is shown in FIG.
As shown in FIG. 4 , the central angle is formed in a circumferential length slightly smaller than 90 °, and the height of the protrusion 6 is such that the tip does not protrude beyond the inner diameter of the first large diameter portion 10. Is set to As shown in FIG. 3, the amount of inward swelling gradually increases from the opening end side of the receiving port 2 to the engaging step surface 6a of the engaging protrusion 6, that is, the engaging protrusion 6 Socket 2
Is formed by a bulging wall 8 whose bulging amount gradually increases inward from the opening end side toward the back side and has a substantially triangular cross-sectional shape.

The insertion opening 3 has a radially inward curl portion 19 for facilitating smooth insertion at the distal end portion 13 thereof, and a reinforcing annular rib 20 on the outer periphery near the distal end portion.
Is formed in the socket 3, and the inward engaging projection 6 provided in the socket 2 when the socket 3 is inserted into the socket 2.
A pair of outward locking projections 7 that can be engaged from the back side of the receiving port 2 are formed to bulge. The locking projection 7 has a circumferential length with a center angle slightly smaller than 90 ° so that it can pass between the engagement projections 6 and 6 on the inner periphery of the receiving port 2 when the insertion port 3 is inserted into the receiving port 2. And the height thereof is set to a height that can be inserted into the second large-diameter portion 11 of the receptacle 2.
The engaging projection 7 is, like the engaging projection 6, provided with an engaging step surface 7 of the engaging projection 7 from the opening end side of the insertion opening 3.
The amount of outward swelling gradually increases toward a, that is, the amount of swelling of the locking projection 7 gradually increases outward from the opening end side of the insertion opening 3 toward the back side. Bulging wall 9
And the cross-sectional shape thereof is substantially triangular.

[0025] As described above, the engaging step portion 12 is formed on the inner peripheral surface of the cylindrical body 1 by forming a first large-diameter portion 1 0 socket 2 at one end portion of the cylindrical body 1, receptacle When the outlet 3 is inserted into the socket 2, the distal end 13 of the outlet 3 comes into contact with the engaging step 12 of the receptacle 2 to regulate the insertion amount of the outlet 3.

Further, an annular projection 14 swelling outward is formed on the inner side of the outlet 3 and is accommodated in the annular groove 18 of the receptacle 2 when the receptacle 3 is inserted into the receptacle 2. The sealing material 5 comes into contact with the annular projection 14 to regulate the insertion amount of the outlet 3. Therefore, the insertion amount of the insertion opening 3 into the receiving opening 2 depends on the engagement step 12 and the annular projection 14.
However, there is no need to be limited to this, and the insertion amount may be limited to only one of them.

As shown in FIGS. 4 (a) and 4 (b), the opening end of the receptacle 2, the tip 13 of the receptacle 3, and the receptacle 2 when the receptacle 3 is inserted and fitted into the receptacle 2. Marks 21, 22, and 23 are formed at positions facing the opening end of the socket 2 to indicate circumferential positions at which the engaging projections 6 can pass between the locking projections 7, respectively. An arrow 24 indicating the direction of rotation of the outlet 3 is formed in FIG.

In the above configuration, the receptacle 2 and the outlet 3
2, the socket 2 and the socket 3 are opposed to each other, and the mark 21 on the outer periphery of the opening end of the socket 2 and the mark 22 on the outer periphery of the tip of the socket 3 correspond to each other as shown in FIG. By positioning them in the circumferential direction, the locking projection 7 is positioned so as to pass between the engagement projections 6, 6, and as shown by the arrow A, the insertion port 3 extends to the far end of the receptacle 2.
Insert. Next, with reference to the arrow 24 on the outer periphery of the receiving port 2, the receiving port 2 and the insertion port 3 are rotated relative to each other as shown by the arrow B, and the locking projection 7 is moved from the back side of the receiving port 2 with respect to the engaging projection 6. Engage. This completes the connection between the receptacle 2 and the outlet 3. As described above, the simple connection work of inserting the insertion port 3 into the receptacle 2 and turning the receptacle 2 prevents the detachment of the receptacle 2 from the receptacle 3 reliably, and also allows the insertion amount between the receptacle 2 and the receptacle 3 to be accurately determined. The O-ring 5 reliably restricts the sealing, reliably prevents the exhaust gas from leaking, and allows the plurality of supply / exhaust cylinders to be connected firmly without rattling.

Further, in this embodiment, since the engaging projection 6 and the locking projection 7 are formed in a substantially triangular cross section by the bulging walls 8 and 9, the force with which the receiving port 2 and the insertion port 3 come out can be reduced. A step surface 6 of the engaging projection 6 and the locking projection 7 that engages with each other.
a, 7a, the bulging walls 8, 9 corresponding to the hypotenuse of the triangle function as brace, and the force is applied to the receiving port 2.
Is smoothly transmitted to the peripheral wall of the outlet 3, that is, the cylinder body 1, so that even when a large pull-out force is applied, the engaging projection 6 and the locking projection 7 are not likely to be deformed, and the pull-out force is large. Even so, it is possible to reliably prevent slipping out.

Further, the annular projection 14 formed on the outer periphery of the outlet 3 is fitted to the inner periphery of the opening end of the receptacle 2,
Even if the inner diameter of the receiving port 2 is set to a diameter that allows the locking projection 7 to pass through, the relative displacement between the receiving port 2 and the insertion port 3 in the radial direction can be prevented, and the sealing performance by the O-ring 5 can be stably secured. Furthermore, since there is no gap at the opening end of the receptacle 2, there is no risk of the worker being caught by a fingertip or the like and causing injury, and an excellent appearance is provided.

In the above embodiment, the O-ring 5 is arranged in the vicinity of the opening end of the receiving port 2 and the engaging projection 6 is disposed on the inner side. The O-ring 5 may be arranged on the opening side of the receptacle 2 on the back side. Further, although the engagement protrusion 6 and the engagement protrusion 7 are provided in pairs, three or more may be provided.

The supply / exhaust cylinder to which the joint structure of the present invention is applied is exemplified by a straight tube, a curved tube, and a tip tube. Needless to say, it can be applied to an exhaust pipe.

[0033]

According to the first aspect of the invention, the socket is inserted into the socket by positioning the circumferential positions of the socket and the socket so that the locking projection can pass between the engagement projections. After that, the receiving port and the insertion port are relatively rotated to engage the locking projection with the engaging projection from the back side of the receiving port,
Separation of the receptacle from the socket can be reliably prevented, so that the connection can be made easily and airtight simply by inserting and rotating the socket, and since it is composed of the receptacle and the socket, the number of parts is small and the configuration is inexpensive. be able to.

Further, according to the present invention , since the inward engaging projection and the outward locking projection are both formed by the swelling wall which swells in an inclined manner, Even if a pull-out force is applied to the engaging step surfaces of the locking projections, the load is reliably received by the projecting action of the two bulging walls, and the strength of the connection portion can be significantly increased.

According to the second aspect of the present invention, the receiving port is
A first large-diameter portion having a diameter larger than the inner diameter of the cylinder main body and a second large-diameter portion having a diameter larger than the inner diameter of the cylinder main body from the back side to the open end portion, and the inward engaging protrusion is 2, the projection of the engaging projection can be made as large as possible, and the area of engagement with the outward locking projection facing the engaging projection can be increased. As a result, the engagement force can be stably exhibited, and the outer diameter of the outlet corresponding to the receiving port is the same as that of the cylinder main body, so that the supply and exhaust cylinders to be connected to each other can be surely surfaced. Can be connected together.

According to the third aspect of the present invention, the first large-diameter portion is formed in the receiving port, so that the engaging step is formed on the inner peripheral surface of the cylindrical body, and the insertion port is inserted and fitted in the receiving port. When the front end of the socket is brought into contact with the engaging step, the insertion amount of the socket into the receptacle is regulated, and the insertion in the insertion direction relative to the receptacle and the receptacle is restricted. Even if a load is applied, it is possible to maintain the insertion positions of each other,
From this surface, the connection portion of the supply / exhaust tube can be stably held without rattling.

According to the fourth aspect of the present invention, an annular projection is formed on the outer periphery of the socket so as to come into contact with the sealing material housed on the inner peripheral side of the socket when the socket is inserted and fitted into the socket. When the outlet is inserted into the receptacle, the annular projection comes into contact with the sealing material, thereby restricting the amount of insertion of the receptacle into the receptacle, and in the insertion direction relative to the receptacle and the receptacle. Even if an external load is applied, the mutual insertion positions can be held, and eventually, in combination with the configuration of the third aspect , the connection portion of the air supply / exhaust tube can be stably held without rattling.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of one embodiment of a connection part structure of a supply / exhaust cylinder of the present invention.

FIG. 2 is a perspective view showing a state where a receptacle and an outlet are separated in the embodiment.

FIG. 3 is an enlarged sectional view of the main part.

FIGS. 4A and 4B show a straight tubular supply / exhaust cylinder having a receiving port and an outlet of the embodiment, wherein FIG. 4A is a plan view and FIG. 4B is a front view.

FIG. 5 is a front view of a curved tubular air supply / exhaust tube having a receiving port and an outlet of the embodiment.

FIG. 6 is a front view of the distal end cylinder having the receiving port of the embodiment at one end.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder main body 2 Reception port 3 Insertion port 4 Supply / exhaust cylinder 5 Sealing material 6 Engagement protrusion 7 Locking protrusion 8 Expansion wall 9 Expansion wall 10 First large diameter part 11 Second large diameter part 12 Engagement Step 13 Front end of insertion opening 3 14 Ring projection

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 37/00-37/28

Claims (4)

(57) [Claims] 1. A connection structure for a supply / exhaust cylinder in which a plurality of supply / exhaust cylinders each having one end side serving as a receiving end and the other end serving as an opening are sequentially inserted and fitted to each other and connected to each other. A seal material is provided on the inner peripheral side near the opening end, and a plurality of inward engaging projections are formed in the receiving port at intervals in the circumferential direction so as to bulge, and when the insertion port is inserted into the receiving port. A plurality of outwards that can pass between the inward engaging projections on the inner periphery of the receiving port and can engage with the inward engaging projection when the receiving port and the insertion port are relatively rotated in the inserted and fitted state. And the inward engaging protrusion is formed in the receiving port.
Gradually expands inward from the open end to the back.
The bulging wall that increases the amount of
It is inclined outward from the front end to the back.
Formed by bulging walls that gradually increase in bulging amount
The structure of the connection part of the supply and exhaust pipes made. 2. The receiving port comprises a first large-diameter portion having a diameter larger than the inner diameter of the cylinder main body and a second large-diameter portion larger than the inner diameter of the cylinder main body from the back side to the opening end side, 2. A connection structure for a supply / exhaust cylinder according to claim 1, wherein said inward engaging projection is formed on a second large diameter portion. 3. An engaging step is formed on the inner peripheral surface of the cylinder main body by forming the first large-diameter portion in the receptacle, and when the receptacle is inserted and fitted in the receptacle, the tip end of the receptacle is formed. The connection structure for a supply / exhaust cylinder according to claim 1 or 2, wherein the connection structure is configured to come into contact with the engagement step. 4. An annular projection formed on the outer periphery of the socket to engage with the sealing material housed on the inner peripheral side of the socket when the socket is inserted and fitted into the socket.
4. A connection structure of a supply / exhaust cylinder according to any one of the above-mentioned items.