CN205560096U - Expansion joint - Google Patents

Abstract

The utility model discloses an expansion joint, which comprises a bellows. A guide cylinder is arranged inside the bellows. One end of the bellows is provided with an inlet flange, and the other end is provided with an outlet flange. The inner diameter of the inlet end is larger than the inner diameter of the outlet end of the guide tube, and it is characterized in that one end of the expansion joint is provided with a flanging structure. The expansion joint of the utility model is provided with a flanging at one end of the expansion joint, so that the two ends of the expansion joint are differentiated, thereby preventing installation errors of the expansion joint, improving the air tightness of the expansion joint, reducing the number of parts, and improving the Reliability of expansion joints.

Description

expansion joint

technical field

The utility model relates to an expansion joint.

Background technique

Expansion joints are flexible components used to absorb assembly errors and thermal expansion displacements of the system during installation, start-up, and work. When used, the structure is required to be simple and reliable, and suitable for mass assembly.

Expansion joints are often used in the intake and exhaust systems of diesel engines. When in use, a guide tube is welded in the bellows. The size of the inlet end of the guide tube is larger than the size of the outlet end. The airflow is guided from the inlet end of the guide tube to the outlet end of the guide tube. , If the expansion joint is installed incorrectly and the airflow flows in reverse, it will cause the expansion joint to resonate and generate a lot of noise.

In order to prevent installation errors at both ends of the expansion joint, it is necessary to differentiate the flanges at both ends of the expansion joint during assembly. For example, the flange at one end is fixedly connected to the other flanges with a clamp, and the flange at the other end is connected to the other flanges through bolts. Fixed connection, or one end of the expansion joint adopts a round flange and the other end adopts a square flange. The problems of the above structure are: increasing the number of components of the expansion joint, increasing the complexity of the expansion joint, increasing the difficulty of the design of the expansion joint, reducing the reliability of the expansion joint, and making the design cost and maintenance cost of the expansion joint large increase in magnitude.

When the expansion joint is used, it is also necessary to ensure the airtightness of the expansion joint connection. At present, sealing is mostly carried out by adding gaskets between the connected flange faces, or directly by controlling the flatness of the end faces of the two connected flanges, and some flanges are fastened by clamps. The inner surface is sealed by means of Chinese patent 201310087029.3. The inner surface of the flange is deformed by the clamp, so that the inner surface of the flange is closely attached to the outer surface of the pipe fitting, thereby realizing the sealing between the flange and the pipe fitting.

The problem with the above structure is that due to the uneven texture of the machined plane, there is a gap between the two contacting sealing surfaces (the end surfaces of the two flanges connected to each other or the inner surface of the flange and the outer surface of the pipe fitting). There must be a gap, and the tightening torque provided by the clamp or the bolt cannot ensure sufficient surface pressure and cannot sufficiently reduce the gap between the sealing surfaces, so there is a large amount of air leakage. In addition, the welding connection between the flange and the bellows will cause thermal deformation of the end face of the flange, which will further increase the gap between the sealing surfaces and increase the leakage. The sealing method of adding gaskets between the flange surfaces will also lead to an increase in the number of parts of the intake and exhaust system. In actual use, the intake and exhaust system will face both expansion joint failure and gasket failure, thereby reducing the expansion joint reliability.

Contents of the invention

The technical problem to be solved by the utility model is to provide an expansion joint to solve the technical problems of wrong installation of the expansion joint and poor air tightness.

In order to solve the above technical problems, the technical solution of the present invention is: an expansion joint, including: a bellows, a guide tube is arranged inside the bellows, an inlet flange is arranged at one end of the bellows, and an inlet flange is arranged at the other end. The outlet flange, the inner diameter of the inlet end of the guide tube is larger than the inner diameter of the outlet end of the guide tube, and it is characterized in that one end of the expansion joint is provided with a flanging structure.

Preferably, one end of the guide tube close to the inlet flange protrudes from the inlet flange, and is turned outward to form the turned-up structure.

Preferably, both the inlet flange and the outlet flange are fixedly connected to the bellows, and the guide tube is slidably connected to the inner side wall of the bellows.

Preferably, one end of the bellows protrudes from the end of the expansion joint, and is flanged outward to form the flanging structure.

Preferably, the inlet flange or the outlet flange is slidably connected to the bellows, and the bellows is fixedly connected to the draft tube.

Preferably, at least one ring wave is provided on each of the flanges, one side of the ring wave protrudes, and the other side is recessed, and the protrusion is arranged opposite to the recess.

After adopting above-mentioned technical scheme, the beneficial effect of the utility model is:

Since one end of the expansion joint is provided with a flanging structure, the shape and structure of the two ends of the expansion joint are obviously different, resulting in the following advantages:

1. The difference between the two ends of the expansion joint is obvious, which can be distinguished with the naked eye. When the expansion joint is assembled to the diesel engine, it can avoid installation errors of the expansion joint, play a role in preventing wrong installation, improve the assembly efficiency of the expansion joint and reduce the cost of the expansion joint. error rate.

2. The design difficulty of the expansion joint is reduced, and the two ends of the expansion joint can be designed as identical flanges.

3. The flanging can be used as a sealing gasket, which reduces the number of parts of the expansion joint, reduces the failure rate of the expansion joint, and improves the reliability of the expansion joint.

Since there is at least one ring wave on the flange, when the flanges are installed together, the end faces of the two flanges squeeze the ring wave, and the ring wave fills the gap between the end faces of the two flanges, so that the gap between the end faces of the two flanges The sealed connection can reduce the leakage of air flow and improve the airtightness of the expansion joint.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of an expansion joint of the present invention;

Fig. 2 is the enlarged schematic view of A in Fig. 1;

In the figure: 1- bellows; 2- inlet flange; 3- outlet flange; 4- guide tube; 5- flanging structure; 6- ring wave.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Embodiment one

As shown in Figure 1, an expansion joint includes a bellows 1, one end of the bellows 1 is welded with an inlet flange 2, and the other end is welded with an outlet flange 3, and the inner wall of the bellows 1 is slidably provided with a guide tube 4 , the end of the guide tube 4 close to the inlet flange 2 protrudes from the outer end surface of the inlet flange 2, and extends in a direction parallel to the outer end surface of the inlet flange 2 to form a flanging structure 5, the size of the flanging structure 5 Larger than the bore size of the inlet flange 2.

Wherein, the guide tube 4 is composed of one or more layers of thin steel plates laminated together.

Since one end of the inlet flange 2 on the expansion joint is provided with a flanging structure 5, the two ends of the expansion joint are clearly differentiated. When assembling, the staff can find the difference between the two ends of the expansion joint with the naked eye, thereby avoiding the expansion joint. Wrong installation greatly reduces the wrong installation rate of the expansion joint, improves the assembly efficiency of the expansion joint, and also reduces the difficulty of the design of the expansion joint, so that the two ends of the expansion joint can use exactly the same flange; at the same time, the flange structure 5 It can be used as a sealing gasket, so that the guide cylinder 4 has a sealing effect, reducing the usage of the sealing gasket, thereby reducing the number of parts of the expansion joint, reducing the failure rate of the expansion joint, and improving the reliability of the expansion joint.

As shown in FIG. 2 , at least one ring wave 6 is provided on the flanging structure 5 , one side of the ring wave 6 protrudes, and the other side is recessed, and the protrusion and the recess are arranged opposite to each other. When the inlet flange 2 is fixedly connected with other flanges, the ring wave 6 is squeezed by the end faces of the two flanges, and the ring wave 6 fills the gap between the end faces of the two flanges, thereby making the sealing connection between the two flange ends , to reduce the leakage of air flow and improve the airtightness of the expansion joint.

Embodiment two

The second embodiment is basically the same as the first embodiment, except that the inlet flange 2 and the outlet flange 3 are both slidingly connected to the bellows 1, the inner surface of the bellows 1 is fixedly connected to the flow guide tube 4, and the inner surface of the bellows 1 One end protrudes from the inlet flange 2 or the outlet flange 3, and extends in a direction parallel to the outer end surface of the inlet flange 2 or the outlet flange 3 to form a flanging structure 5 whose size is larger than that of the inlet flange 2 or the inner hole size of the outlet flange 3 makes the two ends of the expansion joint differentiated, and the flange structure 5 can also be used as a sealing gasket, which is not shown in detail here.

To sum up, the expansion joint of the utility model is equipped with a flanging at one end of the expansion joint, so that the two ends of the expansion joint are differentiated, thereby preventing installation errors of the expansion joint, improving the airtightness of the expansion joint, and reducing the The number of parts increases the reliability of the expansion joint.

The above descriptions are examples of the best implementation modes of the present utility model, and the parts not mentioned in detail are the common knowledge of those skilled in the art. The protection scope of the present utility model is based on the content of the claims, and any equivalent transformation based on the technical inspiration of the present utility model is also within the protection scope of the present utility model.

Claims (6)

1. expansion joint, including: corrugated tube, it is provided with guide shell, one end of described corrugated tube in described corrugated tube Being provided with inlet flange, the other end is provided with outlet(discharge) flange, and the arrival end internal diameter of described guide shell is more than described water conservancy diversion The port of export internal diameter of cylinder, it is characterised in that the one end of described expansion joint is provided with turnup structure.

2. expansion joint as claimed in claim 1, it is characterised in that described guide shell is near described entrance method Described inlet flange, and outward flanging are stretched out in blue one end, form described turnup structure.

3. expansion joint as claimed in claim 2, it is characterised in that described inlet flange and described outlet method Corrugated tube described in Lan Junyu is fixing to be connected, and described guide shell is slidably connected with the medial wall of described corrugated tube.

4. expansion joint as claimed in claim 1, it is characterised in that one end of described corrugated tube is stretched out described The end of expansion joint, and outward flanging, form described turnup structure.

5. expansion joint as claimed in claim 4, it is characterised in that described inlet flange or described outlet Flange is slidably connected with described corrugated tube, and described corrugated tube is fixing with described guide shell to be connected.

6. the expansion joint as described in any one of claim 1-5, it is characterised in that be equipped with on described flange At least one circumferential wave, the side protrusion of described circumferential wave, opposite side is recessed, and described protrusion is recessed with described Just to setting.