Connecting device for low-pressure cylinder in turboset
By installing an inner bushing inside the expansion joint and an outer sheath and baffle rod structure on the outside, the problem of reduced lifespan of the expansion joint caused by steam erosion and mechanical damage is solved, thus improving the protection and safety of the expansion joint.
Patent Information
- Application Number
- CN202520895527.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-08
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-05-08
AI Technical Summary
Expansion joints in steam turbine units have a reduced service life due to steam erosion and mechanical damage, making them prone to breakage and posing safety hazards.
An inner bushing is installed inside the expansion joint, and its range of motion is limited by a stop. An outer protective sleeve and a baffle rod structure are installed on the outside to protect the expansion joint, limit its range of motion, and prevent mechanical damage.
It effectively protects the inner and outer sides of the expansion joint, reduces steam erosion and mechanical damage, extends the service life of the expansion joint, and improves safety.
Smart Images
Figure CN223952676U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a steam turbine unit technical field, specifically a steam turbine unit middle low pressure cylinder connecting device. BACKGROUND
[0002] The middle low pressure cylinder of steam turbine unit adopts the connection of communicating pipe, and the expansion joint is arranged on the communicating pipe, and the strength of the expansion joint is low; the inside of the expansion joint is easily eroded by steam, and the outside of the expansion joint is easily damaged by machinery, and both of them can reduce the service life of the expansion joint, and cause the breakage of the expansion joint and other safety accidents. SUMMARY
[0003] The utility model discloses a steam turbine unit middle low pressure cylinder connecting device to solve the problem of the reduction of the service life and breakage of the expansion joint due to steam erosion and mechanical damage in the prior art.
[0004] In order to realize the above-mentioned purpose, the utility model provides a steam turbine unit middle low pressure cylinder connecting device, including middle pressure cylinder, the middle pressure cylinder is connected with low pressure cylinder through communicating pipe, the expansion joint is equipped on the communicating pipe, the inside of the expansion joint is movably connected with the inner bushing, the length of the inner bushing is greater than the length when the expansion joint is fully unfolded, the position of the expansion joint on the communicating pipe is fixedly connected with the stopper for limiting the activity range of the inner bushing on both sides, and the inner bushing is located between the stoppers on both sides.
[0005] Further, the outside of the expansion joint is sleeved with the outer sleeve, the length of the outer sleeve is greater than the length when the expansion joint is fully unfolded, the position of the outer sleeve on the communicating pipe is fixedly connected with the baffle on both sides, the baffle on one side is fixedly connected with the connecting rod, the baffle on the other side is movably connected with the connecting rod, and the outer sleeve is located in the range surrounded by the baffle and the connecting rod.
[0006] Further, three expansion joints are arranged on the communicating pipe.
[0007] Further, the flange is arranged on the communicating pipe, the pull rod for limiting the expansion and contraction length of the expansion joint is arranged on the flange, the movable hole for the pull rod to pass through is arranged on the flange, and the both ends of the pull rod are connected with the nut.
[0008] The utility model discloses the inner bushing can be protected to the inside of expansion joint, reduces the steam erosion that the inside of expansion joint received, the movable range of the inner bushing can be limited through the stopper, the outer sleeve can be protected to the outside of expansion joint through the setting, avoids the outside of expansion joint to receive the mechanical damage, the movable range of the outer sleeve can be limited through the setting baffle and connecting rod. BRIEF DESCRIPTION OF DRAWINGS
[0009] The drawings accompanying the specification illustrate further aspects of the present application. The preferred embodiments of the present application will be best understood by reference to the drawings, wherein:
[0010] Figure 1 A structure schematic view of the connecting device of the middle and low pressure cylinder in the steam turbine unit in the embodiments;
[0011] In the figure: 1, middle pressure cylinder; 2, communication pipe; 201, flange; 3, low pressure cylinder; 4, inner bushing; 5, stop block; 6, outer sleeve; 7, baffle; 8, connecting rod; 9, pull rod; 10, nut; 11, expansion joint. DETAILED DESCRIPTION
[0012] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.
[0013] As Figure 1 shown, according to the embodiments of the present application, a connecting device of middle and low pressure cylinder in a steam turbine unit is provided, which comprises a middle pressure cylinder 1, the middle pressure cylinder 1 is connected with a low pressure cylinder 3 through a communication pipe 2; an expansion joint 11 is arranged on the communication pipe 2; a cylindrical inner bushing 4 is movably connected inside the expansion joint 11, the length of the inner bushing 4 is greater than the length of the expansion joint 11 when it is fully expanded; stop blocks 5 for limiting the movement range of the inner bushing 4 are fixedly connected on the communication pipe 2 at positions on both sides of the expansion joint 11, the inner bushing 4 is located between the stop blocks 5 on both sides, and the distance between the stop blocks 5 on both sides is greater than the length of the inner bushing 4.
[0014] An outer sleeve 6 is sleeved outside the expansion joint 11, the length of the outer sleeve 6 is greater than the length of the expansion joint 11 when it is fully expanded; baffles 7 are fixedly connected on the communication pipe 2 at positions on both sides of the outer sleeve 6, one side baffle 7 is fixedly connected with a connecting rod 8, and the other side baffle is movably connected with the connecting rod 8; the outer sleeve 6 is located within the range surrounded by the baffles 7 and the connecting rod 8.
[0015] Three expansion joints 11 are arranged on the communication pipe 2.
[0016] In some embodiments, a flange 201 is arranged on the communication pipe 2, a pull rod 9 for limiting the expansion length of the expansion joint 11 is arranged on the flange 201, a movable hole for the pull rod 9 to pass through is arranged on the flange 201, and nuts 10 are connected to both ends of the pull rod 9.
[0017] The utility model discloses a set up inner bush 4, can to the inside of expansion joint 11 carry out the protection, reduce the steam scouring that expansion joint 11 inside received, through setting the block 5, can limit the movable range of inner bush 4, through setting the outer sheath 6, can to the outside of expansion joint 11 carry out the protection, avoid the outside of expansion joint 11 to receive the mechanical damage, through setting the baffle 7 and connecting rod 8, can limit the movable range of outer sheath 6.
[0018] The above only is the preferred embodiment of the utility model and does not use for limiting the utility model, for the technical personnel of the field, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A connecting device for a low-pressure cylinder in a steam turbine unit, comprising a medium-pressure cylinder (1) connected with a low-pressure cylinder (3) through a communicating pipe (2); an expansion joint (11) is arranged on the communicating pipe (2); characterized in that, The inside of the expansion joint (11) is movably connected with an inner sleeve (4), the length of the inner sleeve (4) is greater than the length of the expansion joint (11) when it is fully expanded; the communication pipe (2) is fixedly connected with a stop block (5) for limiting the moving range of the inner sleeve (4) at the positions on both sides of the expansion joint (11), and the inner sleeve (4) is located between the stop blocks (5) on both sides.
2. The connecting device for a low-pressure cylinder of a steam turbine unit according to claim 1, characterized in that, The outside of the expansion joint (11) is sleeved with an outer sleeve (6), the length of the outer sleeve (6) is greater than the length of the expansion joint (11) when it is fully expanded; the communication pipe (2) is fixedly connected with a baffle (7) at the positions on both sides of the outer sleeve (6), the baffle (7) on one side is fixedly connected with a connecting rod (8), and the baffle (7) on the other side is movably connected with the connecting rod (8); the outer sleeve (6) is located within the range surrounded by the baffle (7) and the connecting rod (8).
3. The connecting device for a low-pressure cylinder of a steam turbine unit according to claim 1, characterized in that, Three expansion joints (11) are arranged on the communication pipe (2).
4. The connecting device for a low-pressure cylinder of a steam turbine unit according to claim 1, wherein A flange (201) is arranged on the communication pipe (2), a pull rod (9) for limiting the expansion length of the expansion joint (11) is arranged on the flange (201), a movable hole is arranged on the flange (201) for the pull rod (9) to pass through, and nuts (10) are connected to both ends of the pull rod (9).