Air exhaust assembly of steam turbine

Abstract

The utility model relates to the technical field of turbine structures, in particular to an air exhaust assembly of a turbine. According to the technical scheme, the device comprises an air inlet pipe, a cavity, a gradual change cavity, connecting pipes and a nozzle, the air inlet pipe is installed at an opening in one end of the cavity, the gradual change cavity is installed at an opening in the other end of the cavity, and the connecting pipes are arranged on the annular face of the cavity at equal intervals. Through cooperation of the structures, no extra power device needs to be additionally arranged, air in the working space of the turbine wheel disc can be exhausted through steam flow of the turbine set, the occupied area of the turbine set is reduced, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine structures, in particular to a steam turbine exhaust component. Background Art

[0002] A steam turbine is an external combustion rotary machine that can convert steam thermal energy into mechanical work. After the steam from the boiler enters the steam turbine, it passes through a series of annular nozzles and moving blades in sequence, converting the steam thermal energy into mechanical energy for the rotation of the turbine rotor. Steam undergoes energy conversion in different ways in the steam turbine, forming steam turbines with different working principles.

[0003] The steam turbine vacuum pump is a part of the steam turbine assembly. Its main function is to extract the air in the middle of the wheel during the rotation of the steam turbine, thereby reducing the resistance of the air to the wheel and improving the efficiency of the steam turbine. In addition, the steam turbine vacuum pump can also extend the service life of the steam turbine and reduce maintenance costs.

[0004] The existing steam turbine vacuum pump is usually driven by a pump structure, and a centrifugal pump needs to be installed on the steam turbine to pump the inside of the steam turbine. The installed pump suction structure will not only make the steam turbine unit bulky and occupy more space, but also consume more energy.

[0005] For this reason, we propose a steam turbine exhaust assembly to solve the existing problems. Utility Model Content

[0006] The utility model aims to provide a steam turbine exhaust assembly in view of the problems existing in the background technology.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a steam turbine exhaust assembly, comprising an air intake pipe, a chamber, a gradient cavity, a connecting pipe and a nozzle, wherein the air intake pipe is installed at the opening of one end of the chamber, and the gradient cavity is installed at the opening of the other end of the chamber, and each of the connecting pipes is equidistantly arranged on the annular surface of the chamber, and a nozzle is embedded and installed inside one end of the chamber, and a base is installed on the outer wall of the same end of the chamber, and the air intake pipe is fixed on the base, and the air intake pipe, the nozzle and the chamber are in a state of interconnection.

[0008] Preferably, a gradient cavity is installed at the other end of the chamber;

[0009] The inner diameter of the gradient cavity is in a trumpet shape, and the gradient cavity and the chamber are interconnected;

[0010] A mounting head is installed at one end of the gradient cavity away from the chamber.

[0011] Preferably, there are four connecting pipes in total, and the positions of the four connecting pipes are distributed in a circular array on the annular surface of the chamber;

[0012] A fixing seat is fixed at the bottom end of the connecting pipe, and the fixing seat is installed in the chamber;

[0013] The connecting pipe passes through the fixing seat and is interconnected inside the chamber.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. During use, the steam turbine exhaust assembly of the utility model can be fixed at a designated position of the steam turbine, connected to the working space of the steam turbine wheel through various connecting pipes, connected to the boiler exhaust pipe of the steam turbine through an air inlet pipe, and the high-pressure steam airflow enters the nozzle to form a jet. Under the action of the jet, a negative pressure is formed in the connecting pipe. Under the action of the negative pressure, the air in the working space of the steam turbine wheel can be extracted, and the mixed airflow is discharged through the gradient cavity under reduced pressure. The utility model does not need to add an additional power device, and the air in the working space of the steam turbine wheel can be discharged by using the steam airflow of the steam turbine unit itself, thereby reducing the footprint of the steam turbine unit and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the utility model when viewed from above;

[0018] Figure 3 It is a schematic diagram of the longitudinal structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model.

[0020] Reference numerals:

[0021] 1. Inlet pipe; 2. Base; 3. Chamber; 4. Gradient chamber; 5. Mounting head; 6. Connecting pipe; 7. Fixed seat; 8. Nozzle. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1

[0024] like Figure 1-Figure 4As shown, the utility model proposes a steam turbine exhaust assembly, including an air intake pipe 1, a chamber 3, a gradient chamber 4, a connecting pipe 6 and a nozzle 8. The air intake pipe 1 is installed at the opening of one end of the chamber 3, and the gradient chamber 4 is installed at the opening of the other end of the chamber 3. The connecting pipes 6 are equidistantly arranged on the annular surface of the chamber 3.

[0025] Based on Example 1:

[0026] The device can be fixed at a designated position of the steam turbine, connected to the working space of the steam turbine wheel disc through various connecting pipes 6, connected to the boiler discharge pipeline of the steam turbine through the air inlet pipe 1, and the high-pressure steam flow enters the nozzle 8 to form a jet. Under the action of the jet, a negative pressure is formed in the connecting pipe 6. Under the action of the negative pressure, the air in the working space of the steam turbine wheel disc can be extracted, and the mixed air flow is discharged through the gradient cavity 4 under reduced pressure;

[0027] A nozzle 8 is embedded in one end of the chamber 3, and a base 2 is installed on the outer wall of the same end of the chamber 3. An air intake pipe 1 is fixed on the base 2. The air intake pipe 1, the nozzle 8 and the chamber 3 are in a state of interconnection. Through the cooperation of the above structure, high-pressure steam enters the nozzle 8 through the air intake pipe 1, and then is ejected through the nozzle 8 to form a jet.

[0028] Embodiment 2

[0029] like Figure 1-Figure 4 As shown, the utility model provides a steam turbine exhaust assembly. Compared with the first embodiment, this embodiment also includes:

[0030] A gradient cavity 4 is installed at the other end of the chamber 3;

[0031] The inner diameter of the gradual cavity 4 is in a trumpet shape, and the gradual cavity 4 and the chamber 3 are interconnected;

[0032] Through the design of the gradual change cavity 4, the mixed airflow entering the gradual change cavity 4 can be decompressed.

[0033] An installation head 5 is installed at one end of the gradient cavity 4 away from the chamber 3, and the installation head 5 can be connected to the boiler air intake line to complete the heat energy recovery operation.

[0034] There are four connecting pipes 6 in total, and the positions of the four connecting pipes 6 are distributed in a circular array on the annular surface of the chamber 3;

[0035] A fixing seat 7 is fixed to the bottom end of the connecting pipe 6, and the fixing seat 7 is installed in the chamber 3;

[0036] The connecting pipe 6 passes through the fixing seat 7 and is connected to the inside of the chamber 3.

[0037] Through the design of each connecting pipe 6, each connecting pipe 6 can be installed at different positions of the working space of the turbine wheel, and different areas of the working space of the turbine wheel can be simultaneously sucked through the connecting pipe 6, thereby accelerating the suction efficiency of the air in the working space of the turbine wheel.

[0038] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A steam turbine exhaust assembly, comprising an air inlet pipe (1), a chamber (3), a gradient chamber (4), a connecting pipe (6) and a nozzle (8), characterized in that: An air intake pipe (1) is installed at the opening of one end of the chamber (3), and a gradient chamber (4) is installed at the opening of the other end of the chamber (3). The connecting pipes (6) are equidistantly arranged on the annular surface of the chamber (3). A nozzle (8) is embedded and installed inside one end of the chamber (3). A base (2) is installed on the outer wall of the same end of the chamber (3), and an air intake pipe (1) is fixed on the base (2). The air intake pipe (1), the nozzle (8) and the chamber (3) are in a state of interconnection.

2. A steam turbine exhaust assembly according to claim 1, characterized in that: A gradient cavity (4) is installed at the other end of the cavity (3); The inner diameter of the gradient cavity (4) is in a trumpet shape, and the gradient cavity (4) and the chamber (3) are interconnected; A mounting head (5) is mounted on one end of the gradient cavity (4) which is away from the chamber (3).

3. A steam turbine exhaust assembly according to claim 1, characterized in that: There are four connecting pipes (6) in total, and the positions of the four connecting pipes (6) are distributed in a circular array on the annular surface of the chamber (3); A fixing seat (7) is fixed to the bottom end of the connecting pipe (6), and the fixing seat (7) is installed in the chamber (3); The connecting pipe (6) passes through the fixing seat (7) and is interconnected inside the chamber (3).

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