Front cylinder casting of steam turbine of coal-fired generating set

Abstract

The utility model discloses a front cylinder casting of a steam turbine of a coal-fired power generation unit, which comprises a cylinder body casting, the cylinder body casting comprises a lower cylinder body casting and an upper cylinder body casting, the lower cylinder body casting is of a rectangular structure, and the upper cylinder body casting is of an arc-shaped structure; a first positioning groove and a first positioning raised line are arranged on the upper end face of the lower cylinder body casting at the edge position of the first arc-shaped groove, a second positioning raised line is integrally arranged on the lower end face of the upper cylinder body casting at the position aligned with the first positioning groove, and a second positioning groove is formed in the lower end face of the upper cylinder body casting; the outer surface of the upper cylinder body casting is sleeved with a heat preservation quilt, the outer surface of the heat preservation quilt is sleeved with a heat preservation cover, an air bag is arranged between the inner wall face of the heat preservation cover and the outer surface of the heat preservation quilt, an air inlet of an air inlet pipe of the air bag is fixedly provided with a one-way valve, and an inlet of the one-way valve is provided with an electric air pump. According to the technical scheme, the structural design is reasonable, assembling and disassembling operation is convenient, the heat preservation effect is good, stability during operation is good, overhaul or maintenance efficiency is high, and practicability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a front cylinder casting of a steam turbine of a coal-fired generator set. Background Art

[0002] A steam turbine is a rotary power machine that converts steam into mechanical work, also known as a steam turbine. It is mainly used as a prime mover for power generation, and can also be used as a direct drive source. The cylinder is the outer shell of the steam turbine, which is used to separate the co-flow part of the steam turbine from the large steam, forming a closed steam chamber to ensure that the steam completes the energy conversion process inside the steam turbine. During use, due to failure or replacement, the cylinder needs to be disassembled and the internal parts need to be repaired or replaced.

[0003] After searching, the Chinese patent publication number CN217029042U discloses a steam turbine cylinder, including a cylinder body, an annular limiting groove is provided at the front and rear ends of the cylinder body, and a plurality of positioning holes are provided on the annular limiting groove, and end covers are provided at both ends of the cylinder body, and the end covers are sleeved on the cylinder body, and the end covers are provided with mounting grooves at the positions corresponding to the positioning holes, and a limiting block is slidably connected in the mounting groove, and a positioning column is fixed at one end of the limiting block, and the other end of the adjustment rod passes through the end cover, and the cylinder body includes a left cylinder body and a right cylinder body, and the upper and lower ends of the left cylinder body are respectively provided with a left stepped notch, and a groove is provided in the left stepped notch, and the upper and lower ends of the right cylinder body are respectively provided with a right stepped notch, and a convex strip is provided in the right stepped notch. The design of the end cover and the positioning column can realize the connection between the end cover and the cylinder body through the positioning column, and the end cover is convenient to disassemble, so as to inspect the internal parts of the cylinder body; the design of the left cylinder body and the right cylinder body can realize the detachability of the cylinder body, and after the cylinder body is opened, a larger operating space is provided for inspection, which is convenient for inspection.

[0004] However, the cylinder structure has certain defects in actual use: the structural design is unreasonable. Due to the relatively heavy weight of the cylinder, left stepped notches are respectively provided at the upper and lower ends of the left cylinder body, and a groove is provided in the left stepped notch. Right stepped notches are respectively provided at the upper and lower ends of the right cylinder body, and a convex strip is provided in the right stepped notch. The left stepped notch and the right stepped notch are matched with each other, and the groove and the convex strip are matched with each other. It is troublesome to operate during assembly and disassembly, resulting in low efficiency of inspection or maintenance. In addition, both the left and right cylinder bodies are arc structures, and the positioning is unreliable. The cylinder is prone to vibration and has poor stability during operation. The outer ring insulation layer of the cylinder body is mostly bolted or directly adhered to the cylinder surface. This structure has limited insulation effect and is inconvenient for staff to replace the insulation layer. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a coal-fired generator set steam turbine front cylinder casting which has reasonable structural design, convenient assembly and disassembly, good thermal insulation effect, good stability during operation, high overhaul or maintenance efficiency and good practicality.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a front cylinder casting of a steam turbine of a coal-fired power generation unit, comprising a cylinder casting, wherein the cylinder casting comprises a lower cylinder casting and an upper cylinder casting, wherein the lower cylinder casting is in a rectangular structure, and the upper cylinder casting is in an arc-shaped structure, wherein a first arc-shaped groove with an opening facing upward is provided at the middle position of the upper end surface of the lower cylinder casting, and a second arc-shaped groove with an opening facing downward is provided at the lower end surface of the upper cylinder casting aligned with the first arc-shaped groove, wherein the lower cylinder casting and the upper cylinder casting are detachably connected, and the first arc-shaped groove and the second arc-shaped groove together constitute the inner cavity of the cylinder body;

[0007] The upper end surface of the lower cylinder casting is provided with a first positioning groove and a first positioning convex strip at the edge of the first arc-shaped groove, and a first sealing groove is provided on the inner bottom surface of the first positioning groove; the lower end surface of the upper cylinder casting is provided with a second positioning convex strip in line with the position of the first positioning groove, and the lower end surface of the upper cylinder casting is provided with a second positioning groove in line with the position of the first positioning convex strip, and a second sealing groove is provided in the second positioning groove;

[0008] An insulation blanket is provided on the outer surface of the upper cylinder casting, and an insulation cover is provided on the outer surface of the insulation blanket. An airbag is provided between the inner wall surface of the insulation cover and the outer surface of the insulation blanket. The airbag has an arc-shaped structure, and an air intake pipe is integrally provided at the lower left end of the airbag. A one-way valve is fixedly provided at the air inlet of the air intake pipe, and an electric air pump is provided at the inlet of the one-way valve. The airbag is inflated by the electric air pump. After the airbag is inflated, the outer surface of the insulation blanket is pressed against the inner wall surface of the insulation blanket, so that the outer surface of the upper cylinder casting is pressed against the inner wall surface of the insulation blanket.

[0009] The utility model is further configured as follows: an exhaust pipe is arranged at the lower right end of the airbag, and a sealing screw cover is arranged at the air outlet of the exhaust pipe.

[0010] The utility model is further configured as follows: a first elastic sealing strip is arranged in the first sealing groove, a second elastic sealing strip is arranged in the second sealing groove, a plurality of positioning protrusions are integrally arranged at the lower end of the upper cylinder casting, each positioning protrusion is provided with a fixing bolt, and the upper cylinder casting is locked on the upper end surface of the lower cylinder casting by the fixing bolt.

[0011] The utility model is further configured as follows: the heat-insulating cover is made of stainless steel, and the lower end of the heat-insulating cover is fixed to the upper end surface of the lower cylinder casting by bolts.

[0012] The utility model is further configured as follows: the outer surface of the airbag is connected to the heat preservation cover by Velcro, and an air pressure sensor is arranged in the airbag, and the air pressure sensor is connected to the electric air pump by a wire.

[0013] The utility model is further configured as follows: a plurality of height adjustment devices are arranged at the bottom of the lower cylinder casting, and the height adjustment devices include a screw rod, a bottom plate and a rubber shock-absorbing pad; a plurality of adjustment screw holes with openings facing downward are arranged at the bottom of the lower cylinder casting, and a bottom plate embedding groove is arranged at the lower end of each adjustment screw hole; the upper end of the screw rod is threadedly connected with the aligned adjustment screw hole, the lower end of the screw rod is integrally arranged with the bottom plate, and the lower end surface of the bottom plate is bonded and fixed to the upper end surface of the rubber shock-absorbing pad.

[0014] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model has a reasonable structural design. When the upper cylinder casting is installed on the upper end surface of the lower cylinder casting, the first positioning convex strip on the lower end surface of the upper cylinder casting is inserted into the first positioning groove on the upper end surface of the lower cylinder casting, and the first positioning convex strip on the upper end surface of the lower cylinder casting is inserted into the second positioning groove on the lower end surface of the upper cylinder casting. The upper cylinder casting is locked on the upper end surface of the lower cylinder casting by fixing bolts, and the connection between the upper cylinder casting and the lower cylinder casting is sealed by the first elastic sealing strip and the second elastic sealing strip.

[0015] The airbag is inflated by an electric air pump, and the airbag is inflated to press the outer surface of the insulation blanket, so that the inner wall of the insulation blanket is pressed against the outer surface of the upper cylinder casting. When the insulation blanket and the airbag need to be replaced, it can be replaced by simply opening the insulation cover. The assembly and disassembly operation is convenient, the insulation effect is good, the stability during operation is good, the inspection or maintenance efficiency is high, and the practicality is good.

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0018] Figure 2 for Figure 1 The enlarged schematic diagram of the middle part I;

[0019] Figure 3 This is a schematic structural diagram of a lower cylinder casting according to an embodiment of the utility model;

[0020] Figure 4 It is a schematic structural diagram of the cylinder casting of an embodiment of the utility model. DETAILED DESCRIPTION

[0021] In the description of this embodiment, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore, cannot be understood as a limitation on the utility model. In addition, if the terms "first", "second", and "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] See also Figures 1 to 4 The utility model discloses a front cylinder casting of a steam turbine of a coal-fired power generation unit, comprising a cylinder casting, wherein the cylinder casting comprises a lower cylinder casting 1 and an upper cylinder casting 2, wherein the lower cylinder casting 1 is in a rectangular structure, and the upper cylinder casting 2 is in an arc-shaped structure, wherein a first arc-shaped groove 11 with an opening facing upward is arranged at the middle position of the upper end surface of the lower cylinder casting 1, and a second arc-shaped groove 21 with an opening facing downward is arranged at the lower end surface of the upper cylinder casting 2 aligned with the first arc-shaped groove position, wherein the lower cylinder casting 1 and the upper cylinder casting 2 are detachably connected, and the first arc-shaped groove 11 and the second arc-shaped groove 21 together constitute a cylinder inner cavity;

[0023] The upper end surface of the lower cylinder casting 1 is provided with a first positioning groove 12 and a first positioning convex strip 13 at the edge of the first arc-shaped groove 11, and a first sealing groove 121 is provided on the inner bottom surface of the first positioning groove 12; the lower end surface of the upper cylinder casting 2 is provided with a second positioning convex strip 22 in an integrated manner in alignment with the first positioning groove 12, and the lower end surface of the upper cylinder casting 2 is provided with a second positioning groove 23 in alignment with the first positioning convex strip 13, and a second sealing groove 231 is provided in the second positioning groove 23;

[0024] An insulation blanket 3 is sleeved on the outer surface of the upper cylinder casting 2, and an insulation cover 4 is sleeved on the outer surface of the insulation blanket 3. An airbag 5 is arranged between the inner wall surface of the insulation cover 4 and the outer surface of the insulation blanket 3. The airbag 5 is in an arc-shaped structure, and an air intake pipe 51 is integrally arranged at the lower left end of the airbag 5. A one-way valve 6 is fixedly arranged at the air inlet of the air intake pipe 51, and an electric air pump 7 is arranged at the inlet of the one-way valve 6. The airbag 5 is inflated by the electric air pump 7. After the airbag 5 is inflated, it presses the outer surface of the insulation blanket 3, so that the inner wall surface of the insulation blanket 3 presses the outer surface of the upper cylinder casting 2.

[0025] Preferably, the airbag 5 is made of high temperature resistant silicone material, and the vertical distance between the inner wall surface of the heat preservation cover 4 and the outer surface of the heat preservation quilt 3 is 1-15 cm. The air inlet of the one-way valve 6 is arranged toward the inside of the airbag.

[0026] In order to make the structural design of the utility model more reasonable, as a preference, an exhaust pipe 52 is provided at the lower right end of the airbag 5 in this embodiment, and a sealing screw cover 53 is provided at the air outlet of the exhaust pipe 52 .

[0027] A first elastic sealing strip 8 is provided in the first sealing groove 121, a second elastic sealing strip 9 is provided in the second sealing groove 231, a plurality of positioning protrusions are integrally provided at the lower end of the upper cylinder casting 2, each positioning protrusion is provided with a fixing bolt, and the upper cylinder casting 2 is locked on the upper end surface of the lower cylinder casting 1 by the fixing bolts. Preferably, the first elastic sealing strip 8 and the second elastic sealing strip 9 are both made of high temperature resistant silicone material or high temperature resistant rubber material.

[0028] The heat-insulating cover 4 is made of stainless steel, and the lower end of the heat-insulating cover 4 is fixed to the upper end surface of the lower cylinder casting 1 by bolts. Preferably, the heat-insulating cover 4 is an arc-shaped structure.

[0029] The outer surface of the airbag 5 is connected to the heat preservation cover 4 by Velcro, and an air pressure sensor is arranged in the airbag 5, and the air pressure sensor is connected to the electric air pump 7 by a wire. The gas in the airbag 5 will be inflated according to the air pressure change to ensure the stability of the air pressure.

[0030] The bottom of the lower cylinder casting 1 is provided with a plurality of height adjustment devices 10, the height adjustment devices 10 include a screw, a bottom plate and a rubber shock-absorbing pad. The bottom of the lower cylinder casting 1 is provided with a plurality of adjustment screw holes 14 with openings facing downwards, and the lower end of each adjustment screw hole 14 is provided with a bottom plate embedding groove; the upper end of the screw is threadedly connected with the aligned adjustment screw hole, the lower end of the screw is integrally provided with the bottom plate, and the lower end surface of the bottom plate is bonded and fixed with the upper end surface of the rubber shock-absorbing pad. Preferably, the number of the height adjustment devices 10 is set to be more than 4, and the height adjustment devices 10 are distributed in a rectangular shape. Under normal conditions, the lower end surface of the rubber shock-absorbing pad of each height adjustment device 10 is flush with the bottom surface of the lower cylinder casting 1. When the ground at the installation location of the lower cylinder casting 1 is uneven, the screw is rotated, and the screw drives the aligned bottom plate and the rubber shock-absorbing pad to extend downward, so that the lower cylinder casting 1 is reliably positioned, not easy to loosen, and works stably.

[0031] In actual application, when the upper cylinder casting 2 is installed on the upper end surface of the lower cylinder casting 1, the first positioning convex strip 22 on the lower end surface of the upper cylinder casting 2 is inserted into the first positioning groove 12 on the upper end surface of the lower cylinder casting 1, and the first positioning convex strip 13 on the upper end surface of the lower cylinder casting 1 is inserted into the second positioning groove 23 on the lower end surface of the upper cylinder casting 2. The upper cylinder casting 2 is locked on the upper end surface of the lower cylinder casting 1 by fixing bolts, and the connection between the upper cylinder casting 2 and the lower cylinder casting 1 is sealed by the first elastic sealing strip 8 and the second elastic sealing strip 9.

[0032] The airbag 5 is inflated by an electric air pump 7, and the airbag 5 is inflated to press the outer surface of the thermal insulation quilt 3, so that the inner wall surface of the thermal insulation quilt 3 presses the outer surface of the upper cylinder casting 2. When the thermal insulation quilt 3 and the airbag 5 need to be replaced, only the thermal insulation cover 4 needs to be opened for replacement.

[0033] The utility model has reasonable structural design, convenient assembly and disassembly operation, good heat preservation effect, good stability during operation, high overhaul or maintenance efficiency and good practicality.

[0034] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above-mentioned utility model, which fall within the scope of protection of the present invention.

Claims

1. A front cylinder casting of a steam turbine of a coal-fired generator set, including a cylinder casting, characterized in that: The cylinder casting comprises a lower cylinder casting (1) and an upper cylinder casting (2), wherein the lower cylinder casting (1) is of a rectangular structure, and the upper cylinder casting (2) is of an arc-shaped structure. A first arc-shaped groove (11) with an opening facing upward is provided at the middle position of the upper end surface of the lower cylinder casting (1), and a second arc-shaped groove (21) with an opening facing downward is provided at the lower end surface of the upper cylinder casting (2) aligned with the position of the first arc-shaped groove. The lower cylinder casting (1) and the upper cylinder casting (2) are detachably connected, and the first arc-shaped groove (11) and the second arc-shaped groove (21) together constitute an inner cavity of the cylinder body. The upper end surface of the lower cylinder casting (1) is provided with a first positioning groove (12) and a first positioning convex strip (13) at an edge position of the first arc-shaped groove (11), and a first sealing groove (121) is provided on the inner bottom surface of the first positioning groove (12); the lower end surface of the upper cylinder casting (2) is provided with a second positioning convex strip (22) in an integral manner aligned with the first positioning groove (12), and the lower end surface of the upper cylinder casting (2) is provided with a second positioning groove (23) in an aligned manner with the first positioning convex strip (13), and a second sealing groove (231) is provided in the second positioning groove (23); A heat preservation blanket (3) is sleeved on the outer surface of the upper cylinder casting (2), a heat preservation cover (4) is sleeved on the outer surface of the heat preservation blanket (3), an air bag (5) is arranged between the inner wall surface of the heat preservation cover (4) and the outer surface of the heat preservation blanket (3), the air bag (5) is in an arc-shaped structure, and an air intake pipe (51) is integrally arranged at the lower left end of the air bag (5), a one-way valve (6) is fixedly arranged at the air intake port of the air intake pipe (51), and an electric air pump (7) is arranged at the inlet of the one-way valve (6), and the air bag (5) is inflated by the electric air pump (7). After the air bag (5) is inflated, it presses the outer surface of the heat preservation blanket (3), so that the inner wall surface of the heat preservation blanket (3) presses the outer surface of the upper cylinder casting (2).

2. A coal-fired generator steam turbine front cylinder casting according to claim 1, characterized in that: An exhaust pipe (52) is provided at the lower right end of the air bag (5), and a sealing screw cover (53) is provided at the air outlet of the exhaust pipe (52).

3. A coal-fired generator steam turbine front cylinder casting according to claim 2, characterized in that: A first elastic sealing strip (8) is arranged in the first sealing groove (121), a second elastic sealing strip (9) is arranged in the second sealing groove (231), a plurality of positioning protrusions are integrally arranged at the lower end of the upper cylinder casting (2), each positioning protrusion is provided with a fixing bolt, and the upper cylinder casting (2) is locked on the upper end surface of the lower cylinder casting (1) by the fixing bolt.

4. A coal-fired generator steam turbine front cylinder casting according to claim 3, characterized in that: The heat-insulating cover (4) is made of stainless steel, and the lower end of the heat-insulating cover (4) is connected and fixed to the upper end surface of the lower cylinder casting (1) by bolts.

5. A coal-fired generator steam turbine front cylinder casting according to claim 1 or 4, characterized in that: The outer surface of the airbag (5) is connected to the heat-insulating cover (4) via Velcro, and an air pressure sensor is arranged inside the airbag (5), and the air pressure sensor is connected to the electric air pump (7) via a wire.

6. A coal-fired generator steam turbine front cylinder casting according to claim 1, characterized in that: The bottom of the lower cylinder casting (1) is provided with a plurality of height adjustment devices (10), the height adjustment devices (10) comprising a screw, a bottom plate and a rubber shock-absorbing pad, the bottom of the lower cylinder casting is provided with a plurality of adjustment screw holes with openings facing downward, the lower end of each adjustment screw hole is provided with a bottom plate embedding groove; the upper end of the screw is threadedly connected to the aligned adjustment screw hole, the lower end of the screw is integrally arranged with the bottom plate, and the lower end surface of the bottom plate is bonded and fixed to the upper end surface of the rubber shock-absorbing pad.

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