JP4688767B2 - Telescopic exhaust pipe - Google Patents

Description

  The present invention relates to a telescopic exhaust pipe connected to combustion equipment such as a gas hot air heater.

  Since high-temperature exhaust gas flows through an exhaust pipe connected to a combustion device such as a gas hot-air heater, an outer surface is provided by providing a heat insulating layer (a) by flocking on the outer peripheral surface of the exhaust pipe as shown in FIG. There is one that prevents it from becoming hot (Patent Document 1).

  FIG. 5 shows that an exhaust pipe having a required length can be configured by sequentially connecting a male male pipe (1) and a female pipe (2) in series. The connection part of the pipe (2) is fixed in a secured state by a metal retaining bracket (3).

  The inner circumferential groove (20) formed near the end of the female pipe (2) on the connection side is loaded with an O-ring (4) that is interposed between the male pipe (1) and ensures airtightness. In addition, grease is applied to the loading portion of the O-ring (4).

The outer periphery of the male pipe (1) and the female pipe (2) is provided with a heat insulating layer (a) by flocking except for the conductive area (11) (21) at the connection end, and the retaining bracket (3) Is mounted in such a manner as to straddle the conductive regions (11) and (21). Specifically, these pipes (1) and (2) are held in a retaining state on both outer sides of the outer peripheral ribs (12) and (22) provided around the male pipe (1) and the female pipe (2). The inner flanges (31) and (32) of the retaining fitting (3) are in contact.
In this case, since the metal retaining bracket (3) is mounted so as to straddle the conductive areas (11) and (21) at the connection end of the male pipe (1) and the female pipe (2), the male pipe (1 ) And the female tube (2) are electrically connected. Therefore, by checking whether current flows between the male tube (1) and the female tube (2), it is possible to detect the detachment of the male tube (1) and the female tube (2). There is.

  However, in the exhaust pipe shown in FIG. 5, the total length can be set only in steps by connecting the male pipe (1) and the female pipe (2) in sequence, so when fine-tuning to the final finished dimensions. Must cut the tip of the male tube (1) and female tube (2) in the connected state. Therefore, it takes time for the cutting work, and in the case of excessive cutting by mistake, it is necessary to discard the excessively cut male pipe (1) and female pipe (2), resulting in wasted material.

Therefore, it is also conceivable to form a heat insulating layer by the flocking described above on the outer peripheral surface of the telescopic exhaust pipe shown in FIG.
That is, as shown in FIG. 6, the slide terminal (13) connected to the tip of the male pipe (1) is slidably pressed against the inner surface of the female pipe (2) and the tip of the male pipe (1). The O-ring (4) is loaded into the adjacent annular groove (14). And the heat insulation layer by the flocking similar to the thing of FIG. 5 is formed in the outer periphery whole region of the male pipe (1) and the female rod (2) slidably connected in this way.

  In this way, the insertion depth of the male pipe (1) with respect to the female pipe (2) can be continuously changed to continuously adjust the overall length of the exhaust pipe, and the male pipe (1) and female pipe (2) can slide. Since the electrical connection is established via the terminal (13), the male pipe (1) and the female pipe are checked by checking whether or not current flows between the male pipe (1) and the female pipe (2). The departure from (2) can be detected.

However, in this case, the grease applied to the O-ring (4) on the outer periphery of the male tube (1) adheres to the sliding portion of the inner surface of the female tube (2), so that the slide terminal (13) and the female tube (2 ) May be insulated by the grease.In such a case, even if it is confirmed whether or not current flows between the male pipe (1) and the female pipe (2), the male pipe (1 ) And the female tube (2) cannot be detected.
Japanese Utility Model Publication No. 64-31342

  The present invention has been made in view of such points, and the male pipe (1) and the female pipe can be configured to be able to continuously adjust the length of the telescopic exhaust pipe having a heat insulating layer formed on the outer peripheral surface. It is an object to ensure that (2) can be maintained in an electrically connected state.

[Invention of Claim 1]
The solution means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
`` Female tube (2) made of conductive material,
A male pipe (1) slidably inserted into the female pipe (2) and made of a conductive material, and an airtight gap between the outer circumference of the male pipe (1) and the inner circumference of the female pipe (2). In a telescopic exhaust pipe having an O-ring interposed in between,
A heat insulating layer is laminated on the outer peripheral surface of the female pipe (2),
On the outer peripheral surface of the male pipe (1), a heat insulating layer is laminated except for a belt-like conductive region extending in the axial direction of the male pipe (1),
The female tube (2) is provided with a conductive slide terminal that is elastically pressed against the band-shaped conductive region in an electrical contact state.
According to the above solution, since the male pipe (1) is slidably inserted into the female pipe (2), the insertion depth of the male pipe (1) and the female pipe (2) is continuously changed. This makes it possible to continuously adjust the overall length of the exhaust pipe.

Further, since the heat insulating layer is laminated on the outer peripheral surfaces of the male tube (1) and the female tube (2), it is possible to prevent the outer surface from becoming hot.
Further, according to the above solution, a heat insulating layer is laminated on the outer peripheral surface of the male pipe (1) except for the band-like conductive area extending in the axial direction of the male pipe (1). A slide terminal that is elastically pressed is attached to the female tube (2) in electrical contact. Therefore, the female pipe (2) and the male pipe (1) are maintained in an electrically connected state through a path extending from the female pipe (2) → the slide terminal → the male pipe (1). In this case, even if the male pipe (1) is reciprocally slid to the female pipe (2) for adjusting the overall length of the exhaust pipe, grease does not adhere to the belt-like conductive area on the outer periphery of the male pipe (1). The grease-coated O-ring is interposed between the outer periphery of the male tube (1) and the inner periphery of the female tube (2), and there is no heat insulating layer on the outer peripheral surface of the male tube (1). The conductive region (portion where the slide terminal comes into contact) falls from the surface of the heat insulating layer by the thickness of the heat insulating layer.

Therefore, since the inner surface of the female tube (2) does not contact the band-shaped conductive region, even if grease is attached to the inner surface of the female tube (2), this adheres to the band-shaped conductive region on the outer peripheral surface of the male tube (1). I do not.
Therefore, there is no inconvenience that the belt-like conductive area on the outer peripheral surface of the male pipe (1) and the contact portion of the slide terminal are insulated with grease.

[Invention of Claim 2]
In the invention according to claim 1,
“The slide terminal may be provided on a fastening band for fastening the outer periphery of the insertion side end of the male tube (1) in the female tube (2)”.
In this case, when the outer periphery of the insertion side end of the male tube (1) in the female tube (2) is tightened with a tightening band, the female tube (2) contracts in diameter due to the tightening and the male tube (1) Thus, the female tube (2) and the male tube (1) are fixed in a sliding-prevented state.

[Invention of Claim 3]
In the invention according to claim 1 or claim 2,
In the case where “the band-shaped conductive area is configured to extend linearly in the axial direction of the male pipe (1)”, the band-shaped conductive area that is likely to become hot because there is no heat insulating layer is set in a direction that is difficult to touch. By piping, it is possible to obtain a highly safe piping state.

The present invention has the following specific effects.
In the invention according to claim 1, even if the length of the telescopic exhaust pipe can be continuously adjusted, the contact area between the belt-like conductive area on the outer peripheral surface of the male pipe (1) and the slide terminal is not insulated by grease. The male tube (1) and the female tube (2) are reliably maintained in an electrically connected state.

According to the second aspect of the present invention, since the slide terminal is provided on the tightening band, the slide terminal can be easily matched to the band-shaped conductive region by rotating the tightening band before tightening in the circumferential direction. it can.
In the invention which concerns on Claim 3, since a heat insulation layer does not exist, it can be set as a highly safe piping state by setting and piping the strip | belt-shaped electroconductive area which tends to become hot in the direction which is hard to touch.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a telescopic exhaust pipe according to an embodiment of the present invention.
The male pipe (1) and the female pipe (2) are formed of a cylindrical metal pipe which is a conductive material. As shown in FIGS. 1 and 2, the connection side end (10 Parallel annular ribs (15), (16) are raised on the outer periphery of). An annular groove (17) between the annular ribs (15) and (16) is loaded with an O-ring (18) coated with grease, and the O-ring (18) is connected to the male pipe (1). It is airtightly interposed between the inner peripheral surfaces of the female pipe (2).

Short fibers are planted between the connection side end (10) of the male pipe (1) and the opposite end (19) except for the strip-like conductive area (1a) extending linearly in the longitudinal direction. Thus, the heat insulating layer (5) is formed.
As shown in FIG. 1, the connection end (23) on the insertion side of the male tube (1) in the female tube (2) is a large diameter portion (24) having an enlarged diameter. (24) is fitted with a fastening band (7) for fixing the male pipe (1) and the female pipe (2).

As shown in FIG. 3, the fastening band (7) has fastening flanges (71), (72) on both sides of the annular main body (70) formed by bending a metal strip into a substantially C shape. It is bent.
On one peripheral edge of the annular main body (70), an engaging claw (73) (73) that engages and engages with a large diameter portion (24) formed at the connection end (23) of the female pipe (2). ) And the engaging claws (73) (73) are arranged at a predetermined pitch in the circumferential direction of the annular main body (70). The engaging claw (73) includes a base end portion (730) protruding outward from the peripheral edge of the annular main body portion (70), a horizontal portion (731) bent from the outer end, and further, the horizontal portion (731) It is formed in the shape of a bowl having an engagement tip portion (732) bent inward from the tip of the tip.

  An arcuate elastic plate (74) that is elastically pressed against the outer periphery of the male pipe (1) is spot welded to the inner periphery of the annular main body (70). The arc-shaped elastic plate (74) is configured as shown in FIG. 4, and an elastic metal plate is bent into an arc shape, and an arc-shaped main portion (77) and a slide terminal (76) bent in the inner circumferential direction from one peripheral edge thereof. And an outer terminal (75) bent in the outer peripheral direction. The outer terminal (75) includes a first horizontal portion (750) extending from the arcuate main portion (77), an upright portion (751) bent outward from its tip, and further from the tip of the upright portion (751). A second horizontal portion (752) bent in the horizontal direction is provided.

  When the arc-shaped elastic plate (74) configured as described above is coupled to the annular main portion (70) of the tightening band (7), the engagement extends from the annular main portion (70) of the tightening band (7). The arcuate elastic plate (74) is placed on the inner surface of the annular main body (70) so that the outer terminals (75), (75) of the arcuate elastic plate (74) are positioned inside the claws (73) (73). Abut along. Then, when spot welding is performed on the annular main portion (70) at two locations in the center of the arc-shaped elastic plate (74) (each location is shifted in the circumferential direction), as shown in FIG. An arc-shaped elastic plate (74) is coupled to the inner periphery of the annular main body (70) of 7). In this coupled state, the end of the arc-shaped elastic plate (74) on the slide terminal (76) side is in a state of elasticity in a direction in which it comes in contact with and separates from the annular main portion (70) of the fastening band (7).

  The fastening flange (71) at one end in the circumferential direction of the fastening band (7) has a through hole (710) through which the fastening screw (8) is inserted, and the other fastening flange ( The burring hole formed in 72) is a female screw (720) into which the tightening screw (8) is screwed.

  When assembling the telescopic exhaust pipe according to the present embodiment using each of the above parts, first, a tightening band (7) is attached to the large diameter part (24) formed at the connection end (23) of the female pipe (2). ) Of the engaging claws (73) and (73). In this state, the outer terminals (75) and (75) of the arc elastic plate (74) coupled to the annular main body (70) of the fastening band (7) are connected to the large-diameter portion (24) of the female tube (2). ). Next, the tip of the fastening screw (8) inserted through the through hole (710) of the fastening flange (71) protruding from the circumferential end of the annular main body (70) is connected to the other fastening flange (72 ) And loosely screw into the female screw (720) to temporarily tighten.

  Next, after applying grease to the O-ring (18) portion of the connection side end (10) of the male pipe (1), the connection side end (10) of the male pipe (1) is connected to the female pipe (2). Insert into the connection end (23) side. Then, the O-ring (18) mounted in the annular groove (17) of the male pipe (1) is slidably pressed against the inner surface of the female pipe (2), whereby the female pipe (2) and the male pipe ( The airtightness of the sliding part of 1) is ensured.

  When inserting the male pipe (1) into the female pipe (2), the slide terminal (76) at one end of the arc elastic plate (74) coupled to the annular main body (70) of the fastening band (7) Is brought into contact with the belt-like conductive region (1a) on the outer periphery of the male pipe (1) (the portion where the heat insulating layer (5) is not formed). Then, the strip-shaped conductive area (1a) of the male pipe (1) → the slide terminal (76) → the outer terminals (75) and (75) of the arc-shaped elastic plate (74) and the engaging claws (73) of the fastening band (7) (73) → An electric circuit connected to the large diameter portion (24) of the connection end (23) of the female tube (2) is formed, and the female tube (2) and the male tube (1) are maintained in an electrically connected state.

  Then, after connecting one end of the female pipe (2) to the exhaust port of the gas hot air heater (H) (see FIG. 1), the degree of insertion of the male pipe (1) into the female pipe (2) is adjusted, By tightening the tightening screw (8), the outer periphery of the female pipe (2) and male pipe (1) is pressed with the tightening band (7), and thereby the male pipe (1) and female pipe (2) are pressed. Fix it. As a result, the exhaust gas from the gas hot air heater (H) can be discharged to the outside through the telescopic exhaust pipe composed of the female pipe (2) and the male pipe (1). In addition, when connecting the telescopic exhaust pipe according to the present embodiment to the gas hot air heater (H), since there is no heat insulation layer (5), the band-like conductive area (1a) that is likely to become hot is provided to humans. By setting the piping in a direction that is difficult to touch, piping can be made highly safe.

  In this case, as described above, since the male tube (1) and the female tube (2) are maintained in an electrically connected state, whether the male tube (1) and the female tube (2) are electrically connected or not. By confirming whether or not current flows between the male tube (1) and the female tube (2), it is possible to detect the detachment of the male tube (1) and the female tube (2). .

When adjusting the degree of insertion of the male pipe (1) into the female pipe (2), the grease applied to the O-ring (18) adheres to the inner surface of the female pipe (2), but the male pipe (1 ) Does not adhere to the belt-like conductive area (1a) on the outer surface. The band-like conductive region (1a) on the outer peripheral surface of the male pipe (1) where the heat insulating layer (5) does not exist falls from the surface of the heat insulating layer (a) by the thickness of the heat insulating layer (5). Therefore, even if the inner surface of the female tube (2) is not in contact with the belt-like conductive region (1a) and grease (grease applied to the O-ring (18)) is attached to the inner surface of the female tube (2), It does not adhere to the belt-like conductive area (1a) on the outer peripheral surface of the male pipe (1). Therefore, there is no inconvenience that the contact area between the strip-shaped conductive area on the outer peripheral surface of the male pipe (1) and the slide terminal is insulated with grease, so that the male pipe (1) and the female pipe (2) are securely maintained in electrical connection. Is done. Therefore, by confirming whether an electric current flows between the male pipe (1) and the female pipe (2), it is possible to reliably detect the detachment of the male pipe (1) and the female pipe (2). it can.
In the above embodiment, the telescopic exhaust pipe of the present invention is applied to the gas hot air heater (H), but it can also be applied to combustion equipment such as a water heater.

The longitudinal cross-sectional view of the expansion-contraction type exhaust pipe which concerns on embodiment of this invention The perspective view of the male pipe (1) which comprises the expansion-contraction type exhaust pipe which concerns on embodiment of this invention Perspective view of tightening band (7) Perspective view of arc elastic plate (74) Illustration of conventional example Illustration of conventional example

Explanation of symbols

(1) ... Male pipe
(2) ・ ・ ・ Female tube
(5) (6) ・ ・ ・ Heat insulation layer
(76) ・ ・ ・ Slide terminal
(1a) ・ ・ ・ Striped conductive region

Claims (3)

A female tube (2) made of a conductive material;
A male pipe (1) slidably inserted into the female pipe (2) and made of a conductive material, and an airtight gap between the outer circumference of the male pipe (1) and the inner circumference of the female pipe (2). In a telescopic exhaust pipe having an O-ring interposed in between,
A heat insulating layer is laminated on the outer peripheral surface of the female pipe (2),
On the outer peripheral surface of the male pipe (1), a heat insulating layer is laminated except for a belt-like conductive region extending in the axial direction of the male pipe (1),
A telescopic exhaust pipe in which a conductive slide terminal elastically pressed against the strip-shaped conductive area is attached to the female pipe (2) in an electrical contact state. In the telescopic exhaust pipe according to claim 1,
The slide terminal is a telescopic exhaust pipe provided on a fastening band for fastening the outer periphery of the insertion side end of the male pipe (1) in the female pipe (2). In the telescopic exhaust pipe according to claim 1 or 2,
The belt-like conductive area is a telescopic exhaust pipe configured to extend linearly in the axial direction of the male pipe (1).

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