CN211116219U - Expansion joint for exhaust pipe of diesel engine - Google Patents

Abstract

The utility model discloses an expansion joint for a diesel engine exhaust pipe, which comprises a first exhaust pipe, an expansion joint and a second exhaust pipe which are connected in sequence, wherein the expansion joint comprises an end pipe with taper pipe threads, a corrugated pipe, a loop flange and a locking nut; the lateral wall processing of end pipe has tapered external screw thread, the inside wall processing of first exhaust pipe has the internal thread with tapered external screw thread looks adaptation. This expansion joint for diesel engine blast pipe, first blast pipe and expansion joint connected mode adopt the taper pipe threaded connection who has self sealss function, make it connect and form taper pipe threaded connection, realize high-speed joint and sealed.

Description

Expansion joint for exhaust pipe of diesel engine

Technical Field

The utility model relates to an expansion joint technical field specifically is an expansion joint for diesel engine blast pipe.

Background

For a multi-cylinder V-shaped engine, in order to reduce machining and installation errors of the exhaust pipes, the exhaust pipes are usually of a sectional type structure, and the front exhaust pipe and the rear exhaust pipe are connected through a pipeline connecting piece. The corrugated pipe has the advantages of absorbing axial and transverse displacement, isolating vibration, sealing and the like, and is widely applied to connection of engine exhaust pipes. With the development of engine technology, the exhaust pipe is required to have the characteristics of compactness, rapid installation and disassembly, good sealing performance and the like. The conventional expansion joint and the exhaust pipe are mainly connected by welding, clamping connection, insertion pipe connection and the like.

Although the connection mode is many, the connection mode adopts welding and can not be disassembled; the clamp connection can not be completely sealed, and gas leaks; the pipe inserting connection is adopted, the axial adjusting capacity is achieved due to the pipe inserting connection, the axial adjusting capacity of the corrugated pipe is reduced, meanwhile, the sealing formed by the pipe inserting connection belongs to dynamic sealing, the precision of a sealing surface is required to be extremely high, and the problems that a welding line is cracked and a flow guide pipe is prone to falling off rapidly under the high-temperature condition can be solved due to the fact that no connection mode is available.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an expansion joint for diesel engine blast pipe to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: an expansion joint for a diesel engine exhaust pipe comprises a first exhaust pipe, an expansion joint and a second exhaust pipe which are sequentially connected, wherein the expansion joint comprises an end pipe and a corrugated pipe which are mutually connected, a flanging is arranged at the outer end of the corrugated pipe, and a loose flange is sleeved on the outer side of the corrugated pipe close to the flanging;

a locking nut in threaded connection with the second exhaust pipe is arranged on the outer side of the loop flange;

the outer side wall of the end pipe is provided with a tapered external thread, and the inner side wall of the first exhaust pipe is provided with an internal thread matched with the tapered external thread;

a conical surface is processed on the bottom diameter of the internal thread of the locking nut;

the terminal surface processing of second blast pipe has the seal groove, it has the sealing washer to inlay in the seal groove.

Preferably, the thread degree of the external thread of the end pipe is 60 degrees, and the thread taper angle degree is 1 degree 47'.

Preferably, the degree of the conical surface is 30 °.

Preferably, the inner end of the end tube extends into the bellows.

Compared with the prior art, the beneficial effects of the utility model are that:

this expansion joint for diesel engine blast pipe, first blast pipe and expansion joint connected mode adopt the taper pipe threaded connection who has self sealss function, make it connect and form taper pipe threaded connection, realize high-speed joint and sealed.

According to the expansion joint for the exhaust pipe of the diesel engine, the second exhaust pipe is connected with the expansion joint through the locking nut, when the locking nut is screwed on the second exhaust pipe, the crest of the external thread is tightly attached to the 30-degree conical surface of the root of the internal thread, so that a large radial locking force is generated, the nut has a strong capability of resisting radial vibration, and the effect of vibration resistance and looseness prevention is achieved.

This expansion joint for diesel engine blast pipe, it has inside the seal groove to open at the second blast pipe fracture department, and inside is equipped with the sealing ring, and when lock nut screwed up, the loop flange of expansion joint closely laminated with the left end of second blast pipe, tightly pressed the sealing washer on sealed face, formed static seal, reached sealed effect.

According to the expansion joint for the exhaust pipe of the diesel engine, one end of the corrugated pipe is welded with the end pipe, the other end of the corrugated pipe is connected with the loop flange through the flanging process, the loop welding seam of the corrugated pipe and the flange is reduced through the flanging of the corrugated pipe, the phenomena that the loop welding seam is cracked and the like caused by instantaneous high temperature in the exhaust pipe are reduced, the service life of the corrugated pipe is prolonged, and meanwhile, the loop flange can well compensate circumferential force generated when the locking nut and the second exhaust pipe are screwed up around circumferential motion.

Drawings

FIG. 1 is a schematic view of the assembled structure of the present invention;

FIG. 2 is a schematic structural view of the expansion joint of the present invention;

fig. 3 is a schematic view of the thread engagement structure between the lock nut and the second exhaust pipe of the present invention.

In the figure: 1. the exhaust pipe comprises a first exhaust pipe body, a second exhaust pipe body, an end pipe body, a corrugated pipe body, a locking nut body, a movable sleeve flange, a sealing ring, a second exhaust pipe body and a flange, wherein the first exhaust pipe body 2, the end pipe body 3, the corrugated pipe body 4, the locking nut.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: an expansion joint for a diesel engine exhaust pipe comprises a first exhaust pipe 1, an expansion joint and a second exhaust pipe 7 which are sequentially connected, wherein the expansion joint comprises an end pipe 2 and a corrugated pipe 3 which are mutually connected, the inner side end of the end pipe 2 extends into the corrugated pipe 3, a flanging 8 is arranged at the outer end of the corrugated pipe 3, and a loop flange 5 is sleeved at the position, close to the flanging 8, of the outer side of the corrugated pipe 3;

referring to fig. 3, a lock nut 4 in threaded connection with a second exhaust pipe 7 is pressed on the outer side of a loose flange 5, a conical surface is processed on the bottom diameter of an internal thread of the lock nut 4, the degree of the conical surface is 30 degrees, the second exhaust pipe 7 is connected with an expansion joint by the lock nut 4, an external thread on the second exhaust pipe 7 is a standard thread matched with the external thread, when the lock nut 4 is screwed on the second exhaust pipe 7, the crest of the external thread tightly clings to the conical surface of the root of the internal thread by 30 degrees, a large radial locking force is generated, the nut has a strong capability of resisting radial vibration, and the effects of vibration resistance and looseness prevention are achieved;

referring to fig. 1-2, the outer side wall of the end pipe 2 is provided with tapered external threads, the degree of the external threads is 30 degrees, the inner side wall of the first exhaust pipe 1 is provided with internal threads matched with the tapered external threads, and the first exhaust pipe 1 is connected with the expansion joint in a self-sealing conical pipe threaded connection mode to form a conical pipe threaded connection so as to realize connection and sealing;

referring to fig. 1, a sealing groove is formed in an end face of the second exhaust pipe 7, a sealing ring 6 is embedded in the sealing groove, and when the locking nut is tightened, a loop flange 5 of the expansion joint is tightly attached to the left end of the second exhaust pipe, so that the sealing ring is tightly pressed on a sealing surface to form static sealing, and a sealing effect is achieved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides an expansion joint for diesel engine blast pipe, is including first blast pipe (1), expansion joint and the second blast pipe (7) that connect gradually, the expansion joint is including end pipe (2) and bellows (3) that interconnect, the outer end of bellows (3) is equipped with turn-ups (8), turn-ups (8) department cover is pressed close to in the bellows (3) outside is equipped with lap-joint flange (5), its characterized in that:

a locking nut (4) in threaded connection with the second exhaust pipe (7) is pressed on the outer side of the loop flange (5);

the outer side wall of the end pipe (2) is provided with a tapered external thread, and the inner side wall of the first exhaust pipe (1) is provided with an internal thread matched with the tapered external thread;

a conical surface is processed on the bottom diameter of the internal thread of the locking nut (4);

the end face of the second exhaust pipe (7) is processed with a sealing groove, and a sealing ring (6) is embedded in the sealing groove.

2. The expansion joint for the exhaust pipe of the diesel engine as set forth in claim 1, wherein: the thread degree of the external thread of the end pipe (2) is 60 degrees, and the thread taper angle degree is 1 degree 47'.

3. The expansion joint for the exhaust pipe of the diesel engine as set forth in claim 1, wherein: the degree of the conical surface is 30 degrees.

4. The expansion joint for the exhaust pipe of the diesel engine as set forth in claim 1, wherein: the inner side end of the end pipe (2) extends into the corrugated pipe (3).

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