Communication pipe expansion joint structure with reinforcing plate

Abstract

The invention relates to a communicating pipe expansion joint structure, in particular to a communicating pipe expansion joint structure with a reinforcing plate, and aims to solve the problems that a turbine communicating pipe is provided with a corrugated joint, but the corrugated joint is used as a thin-wall flexible element, so that the communicating pipe is easy to vibrate, and the corrugated joint is easy to damage and leak when subjected to expansion telescopic displacement of different degrees. The corrugated pipe comprises a corrugated pipe section and a connecting plate, an expansion joint is arranged in the middle of the corrugated pipe section, straight pipes are arranged at the two ends of the expansion joint, connecting plate fixing ends are arranged at the two ends of the connecting plate, the two connecting plate fixing ends are fixedly connected through a connecting plate connecting rod, and the connecting plate fixing ends at the two ends of the connecting plate are welded and fixedly installed on the straight pipes at the two ends of the expansion joint respectively. The invention is used in the field of steam turbine pipeline connection.

Description

Technical Field

[0001] The invention relates to a connecting pipe expansion joint structure, in particular to a connecting pipe expansion joint structure with a reinforcing plate. The invention is used in the field of steam turbine pipeline connection. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle and becomes an accelerated airflow, which is then sprayed onto the blades, causing the rotor with blade rows to rotate and perform work externally. Currently, the connecting pipe of the steam turbine is connected between the steam inlet valve and the high-pressure cylinder or the high- and low-pressure cylinders. Due to temperature and pressure changes, the connecting pipe expands and deforms the pipeline. Now, adding corrugated joints to the connecting pipe can effectively compensate for the displacement of the pipeline in the axial, lateral, and angular directions. When the corrugated joint is subjected to force, it will produce a large deformation at the crest and trough of the wave, thereby protecting the pipeline system from stress damage caused by displacement. However, as a thin-walled flexible component, the corrugated joint is prone to cause vibration of the connecting pipe, and is easily damaged and leaked when subjected to different degrees of expansion and contraction displacement. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that a bellows joint is provided on a steam turbine connecting pipe, but the bellows joint, as a thin-walled flexible element, is prone to cause vibration of the connecting pipe and is easily damaged and leaked when subjected to different degrees of expansion and contraction displacement, and further provide a connecting pipe expansion joint structure with a reinforcement plate.

[0004] The technical solution adopted by the present invention to solve the above problems is:

[0005] A connecting pipe expansion joint structure with a reinforcing plate, comprising a bellows section and a connecting plate;

[0006] The middle of the bellows section is an expansion joint, both ends of the expansion joint are straight pipes, both ends of the connecting plate are connecting plate fixed ends, the two connecting plate fixed ends are fixedly connected by a connecting plate connecting rod, and the connecting plate fixed ends at both ends of the connecting plate are respectively welded and fixedly installed on the straight pipes at both ends of the expansion joint.

[0007] Furthermore, the connecting plate fixed end of the connecting plate is a rectangular plate body, a countersunk hole is processed on the rectangular plate body, and the rectangular plate body and the side walls of the countersunk hole on the rectangular plate body are welded and installed on the inner wall of the straight pipe.

[0008] Furthermore, the outer side surface of the connection plate fixed end welded to the inner wall of the straight tube is an arc surface, and the arc surface of the connection plate fixed end is fitted with the inner wall of the straight tube, and the inner side surface of the connection plate fixed end is a plane.

[0009] Furthermore, the width of the connecting plate fixed end on the connecting plate is greater than the width of the connecting rod of the connecting plate.

[0010] Furthermore, the outer diameter of the bellows of the expansion joint on the bellows section is greater than the outer diameter of the straight pipe on the bellows section.

[0011] Further, the thickness of the connecting plate connecting rod on the connecting plate is two-thirds of the width of the connecting plate connecting rod on the connecting plate.

[0012] Beneficial effects of the present invention:

[0013] 1. The present invention welds a connecting plate 2 between the corrugated pipe section 1 and the straight pipe section to control the thermal expansion and contraction displacement of the corrugated section of the connecting pipe and the vibration of the pipeline system under temperature and pressure changes. The structure is simple and easy to operate.

[0014] 2. The present invention aims at the connecting pipe between the steam inlet valve and the high-pressure cylinder of the steam turbine, controls the damage and pipeline vibration caused by the excessive and rapid displacement load of the bellows joint caused by the thermal expansion and contraction displacement of the bellows joint during the expansion process of the connecting pipe, controls the displacement load range of the bellows caused by the expansion of the connecting pipe due to temperature and pressure changes through the connecting plate, ensures the stability of the pipeline system, and does not cause vibration of the connecting pipe, thereby improving the safety and reliability of the unit and extending the service life of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 for Figure 1 Center AA view.

[0017] Figure 3 for Figure 2 Middle K-axis view.

[0018] Figure 4 A schematic diagram is used for this application.

[0019] Figure 5 This is the front view of connecting plate 2.

[0020] Figure 6 for Figure 5 Middle BB view.

[0021] Figure 7 It is a top view of the connecting plate 2. DETAILED DESCRIPTION

[0022] Specific implementation method 1: Combination Figure 1-Figure 7 The present embodiment is described as follows. The present embodiment describes a connecting pipe expansion joint structure with a reinforcing plate, which comprises a bellows section 1 and a connecting plate 2;

[0023] The middle of the bellows section 1 is an expansion joint, the two ends of the expansion joint are straight pipes, the two ends of the connecting plate 2 are connecting plate fixed ends, the two connecting plate fixed ends are fixedly connected by a connecting plate connecting rod, and the connecting plate fixed ends at both ends of the connecting plate 2 are respectively welded and fixedly installed on the straight pipes at both ends of the expansion joint.

[0024] Specific implementation method 2: Combination Figure 5-Figure 7 This embodiment is described. This embodiment describes a connecting pipe expansion joint structure with a reinforcing plate. The connecting plate fixed end of the connecting plate 2 is a rectangular plate body, a countersunk hole is processed on the rectangular plate body, and the rectangular plate body and the side walls of the countersunk hole on the rectangular plate body are welded and installed on the inner side wall of the straight pipe. Other methods are the same as the specific embodiment 1.

[0025] Specific implementation method three: Combination Figure 1-Figure 7 This embodiment is described. In this embodiment, a connecting pipe expansion joint structure with a reinforcing plate is described. The outer side surface of the connecting plate fixed end welded to the inner side wall of the straight pipe is an arc surface, and the arc surface of the connecting plate fixed end is fitted with the inner side wall of the straight pipe, and the inner side surface of the connecting plate fixed end is a plane. Other methods are the same as the second embodiment.

[0026] Specific implementation method four: Combination Figure 5-Figure 7 This embodiment is described as a connecting pipe expansion joint structure with a reinforcing plate, in which the width of the connecting plate fixed end on the connecting plate 2 is greater than the width of the connecting plate connecting rod. Other methods are the same as those in the first embodiment.

[0027] Specific implementation method five: Combination Figure 1 This embodiment describes a connecting pipe expansion joint structure with a reinforcing plate, wherein the outer diameter of the bellows of the expansion joint on the bellows section 1 is greater than the outer diameter of the straight pipe on the bellows section 1. Other methods are the same as those in the first embodiment.

[0028] Specific implementation method six: Combination Figure 5-Figure 7 This embodiment describes a connecting pipe expansion joint structure with a reinforcing plate, in which the thickness of the connecting plate connecting rod on the connecting plate 2 is two-thirds of the width of the connecting plate connecting rod on the connecting plate 2. Other methods are the same as those in the fourth embodiment.

[0029] Combination Figure 4 It can be seen that the thermal expansion and contraction a and b on the left and right sides of the connecting pipe are controlled by the connecting plate C, and the thermal expansion and contraction c generated by the axial pipe is controlled by the connecting plates A and B. The damage to the bellows caused by the thermal expansion and contraction displacement of the connecting pipe in the axial and up and down directions is well controlled, thereby improving the service life of the pipeline.

[0030] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A connecting pipe expansion joint structure with a reinforcement plate, characterized in that: It comprises a bellows section (1) and a connecting plate (2); The middle of the bellows section (1) is an expansion joint, the two ends of the expansion joint are straight pipes, the two ends of the connecting plate (2) are connecting plate fixed ends, the two connecting plate fixed ends are fixedly connected by connecting plate connecting rods, and the connecting plate fixed ends at both ends of the connecting plate (2) are respectively welded and fixedly installed on the straight pipes at both ends of the expansion joint.

2. A connecting pipe expansion joint structure with a reinforcing plate according to claim 1, characterized in that: The connecting plate fixing end of the connecting plate (2) is a rectangular plate body, a countersunk hole is processed on the rectangular plate body, and the sides of the rectangular plate body and the side walls of the countersunk hole on the rectangular plate body are welded and installed on the inner side wall of the straight pipe.

3. A connecting pipe expansion joint structure with a reinforcing plate according to claim 2, characterized in that: The outer side surface of the connection plate fixed end welded to the inner wall of the straight pipe is an arc surface, and the arc surface of the connection plate fixed end is fitted with the inner wall of the straight pipe, and the inner side surface of the connection plate fixed end is a plane.

4. A connecting pipe expansion joint structure with a reinforcing plate according to claim 1, characterized in that: The width of the connecting plate fixed end on the connecting plate (2) is greater than the width of the connecting plate connecting rod.

5. A connecting pipe expansion joint structure with a reinforcing plate according to claim 1, characterized in that: The outer diameter of the bellows of the expansion joint on the bellows section (1) is greater than the outer diameter of the straight pipe on the bellows section (1).

6. A connecting pipe expansion joint structure with a reinforcing plate according to claim 4, characterized in that: The thickness of the connecting rod of the connecting plate (2) is two thirds of the width of the connecting rod of the connecting plate (2).

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