TRT front shaft seal capable of preventing coal gas leakage

Abstract

The utility model belongs to the technical field of shaft seals, and particularly discloses a TRT front shaft seal capable of preventing coal gas leakage, which comprises a casing, a shaft seal and a rotor, a sealing ring groove is arranged at the joint of the shaft seal and the casing, a sealing ring is arranged in the sealing ring groove, sealing strip grooves are arranged on the upper portion and the lower portion of the shaft seal, and sealing strips are arranged in the sealing strip grooves. Air seal teeth are arranged in the upper shaft seal part and the lower shaft seal part, sealing assemblies used for sealing are arranged on the upper shaft seal part and the lower shaft seal part, air seal pieces are arranged on the rotor, and the air seal teeth and the air seal pieces are connected in a clamped mode; the sealing ring is arranged at the joint of the machine shell and the shaft seal, the sealing strip is arranged on the contact face of the upper portion of the shaft seal and the lower portion of the shaft seal, coal gas is prevented from leaking out of a connecting gap of the shaft seal, safety is improved, and the problem that after the gas seal teeth are abraded in a sealing mode, gas leakage is caused is solved. And gas leaks from a connecting gap of the shaft seal, so that the probability of gas poisoning or nitrogen suffocation of operators is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shaft seal, concretely relates to a TRT front shaft seal preventing gas leakage. BACKGROUND

[0002] TRT refers to blast furnace gas excess pressure turbine power generation device, and the role of the TRT front shaft seal is to ensure that blast furnace gas does not leak during the turbine expansion work process critical component, usually adopts labyrinth seal or carbon ring seal, wherein carbon ring seal usually consists of one or more carbon rings, and these carbon rings form a sealing gap between the shaft and the sealing seat, and the carbon ring seal combines the advantages of labyrinth seal and floating ring seal, and the labyrinth seal refers to a plurality of annular gas seal teeth arranged in sequence around the rotating shaft, and a series of interception gaps and expansion cavities are formed between the teeth, which have better sealing performance and wear resistance.

[0003] The sealing form of the existing TRT front shaft seal is carbon ring seal + nitrogen seal, carbon ring seal is installed at the front end of the front shaft seal, nitrogen is introduced into the holes drilled on the gas seal teeth, nitrogen fills between each gas seal tooth, forms a nitrogen channel, thereby isolates the mixing of air and gas in the pipeline, and the gas is blocked by the gas seal and the nitrogen seal to prevent the gas from leaking between the TRT rotor and the front shaft seal, and the material of the gas seal teeth is graphite, but when the gas seal teeth are worn, the nitrogen cannot seal the gas, and the gas leaks from the connecting gap of the shaft seal, which causes the concentration of gas in the workshop to exceed the standard, and once the concentration of gas exceeds the standard, the probability of gas poisoning or nitrogen suffocation of the operating personnel increases, and there is a safety hazard. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a TRT front shaft seal preventing gas leakage to solve the problem that when the gas seal is worn, the gas leaks from the connecting gap of the shaft seal, and the probability of gas poisoning or nitrogen suffocation of the operating personnel increases.

[0005] To achieve the above-mentioned purpose, the basic scheme provided by the utility model is as follows: a TRT front shaft seal preventing gas leakage, which comprises a shell, a shaft seal and a rotor, the front end diameter of the shaft seal is smaller than the rear end diameter, the shell and the rear end of the shaft seal are bolted, a sealing ring groove is formed at the connection between the rear end of the shaft seal and the shell, a sealing ring is arranged in the sealing ring groove, the shaft seal is composed of an upper shaft seal and a lower shaft seal, a sealing strip groove is formed in the upper shaft seal and the lower shaft seal, a sealing strip is arranged in the sealing strip groove, a plurality of gas seal teeth are detachably connected in the upper shaft seal and the lower shaft seal, a sealing assembly for sealing is arranged on the upper shaft seal and the lower shaft seal, the shaft seal and the rotor are rotationally connected, a plurality of gas seal pieces are detachably connected to the rotor, and each gas seal tooth and gas seal piece are clamped.

[0006] The utility model discloses a principle and beneficial effect at: use, first through the labyrinth seal of gas seal tooth and gas seal piece, then set up the sealing ring at the rear bolt connection of the shell and shaft seal, set up the sealing strip at the contact surface of the upper portion of shaft seal and the lower portion of shaft seal, can further reduce the leakage of coal gas from the connecting gap of shaft seal, increase the probability of operating personnel coal gas poisoning or nitrogen gas asphyxia, and the sealing ring and sealing strip structure are relatively simple, and installation and maintenance are all more convenient.

[0007] Scheme two, this is the preferred basis scheme, and the sealing assembly includes two nitrogen inlets and two nitrogen outlets, nitrogen holes are formed in each gas seal tooth, and the upper portion of the shaft seal, the nitrogen inlet and the nitrogen outlet are fixedly connected, and the lower portion of the shaft seal, the nitrogen inlet and the nitrogen outlet are fixedly connected; nitrogen holes are formed in the sealing teeth, which facilitates the introduction of nitrogen, blocks coal gas and reduces the leakage of coal gas from the TRT rotor and the front shaft seal.

[0008] Scheme three, which is a preferred scheme two, the nitrogen holes are conical; the conical gas holes make it easier for nitrogen to flow into the gas seal tooth gap to fill, thereby increasing the gas flow rate.

[0009] Scheme four, which is a preferred scheme two, the nitrogen holes are arranged in a left-right interval; after the gas fills the entire gas seal tooth gap, it enters the next gas seal tooth gap, thereby increasing the sealing effect of the device.

[0010] Scheme five, which is a preferred basis scheme, the vertical section of the sealing strip groove and the sealing strip is trapezoidal, and the horizontal section of the sealing ring groove and the sealing ring is trapezoidal; when the sealing ring and the sealing strip are used, the lower base of the trapezoid faces each connection, thereby increasing the contact area of the sealing ring and the sealing strip with each connection and reducing the leakage of coal gas from the connecting gap of the shaft seal.

[0011] Scheme six, which is a preferred basis scheme, the material of the sealing ring and the sealing strip is fluororubber; fluororubber has excellent chemical resistance, high temperature resistance, oil resistance, electrical insulation and weather resistance, and in particular, it can maintain elasticity and durability in a temperature range of -20 DEG C to 200 DEG C, thereby increasing the service life of the sealing ring and the sealing strip. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a perspective view of a TRT front shaft seal for preventing coal gas leakage according to the utility model;

[0013] Figure 2 is a front view of a TRT front shaft seal for preventing coal gas leakage according to the utility model;

[0014] Figure 3 is Figure 2 a sectional view at A-A in Fig.

[0015] Figure 4This is an exploded view of the front shaft seal of a TRT (Transmission Timing Unit) for preventing gas leakage, according to this utility model. Detailed Implementation

[0016] The present invention will be further described in detail below through specific embodiments:

[0017] The reference numerals in the accompanying drawings include: 1. Shaft seal, 101. Upper part of shaft seal, 102. Lower part of shaft seal, 2. Nitrogen inlet, 3. Nitrogen outlet, 4. Housing, 5. Sealing ring groove, 6. Sealing strip groove, 7. Nitrogen hole, 8. Gas seal tooth, 9. Gas seal plate, 10. Rotor, 12. Sealing ring, 13. Sealing strip.

[0018] Example

[0019] like Figures 1 to 4 As shown: A TRT front shaft seal for preventing gas leakage includes a housing 4, a shaft seal 1, and a rotor 10. The front diameter of the shaft seal 1 is smaller than the rear diameter. The housing 4 and the rear end of the shaft seal 1 are bolted together. A sealing ring groove 5 is formed at the connection between the rear end of the shaft seal 1 and the housing 4. A sealing ring 12 is provided in the sealing ring groove 5. The shaft seal 1 consists of an upper shaft seal 101 and a lower shaft seal 102. Both the upper shaft seal 101 and the lower shaft seal 102 have sealing strip grooves 6. A sealing strip 13 is provided in the sealing strip grooves 6. The vertical cross-section of the sealing strip groove 6 and the sealing strip 13 is trapezoidal. The horizontal cross-section of the sealing ring groove 5 and the sealing ring 12 is trapezoidal. The sealing ring 12 and the sealing strip 13 are connected together. Material 3 is fluororubber. Several gas sealing teeth 8 are detachably connected inside the upper part 101 and the lower part 102 of the shaft seal. The upper part 101 and the lower part 102 of the shaft seal are provided with sealing components for sealing. The sealing components include two nitrogen inlets 2 and two nitrogen outlets 3. Each gas sealing tooth 8 has a nitrogen hole 7. The nitrogen hole 7 is conical and arranged at left and right intervals. The upper part 101 of the shaft seal, the nitrogen inlet 2 and the nitrogen outlet 3 are fixedly connected. The lower part 102 of the shaft seal, the nitrogen inlet 2 and the nitrogen outlet 3 are fixedly connected. The shaft seal 1 and the rotor 10 are rotatably connected. Several gas sealing plates 9 are detachably connected to the rotor 10. Each gas sealing tooth 8 and the gas sealing plate 9 are snapped together.

[0020] The embodiment of the present application is that when the shaft seal upper part 101 and the shaft seal lower part 102 are installed, the sealing strip 13 is first placed in the sealing strip groove 6 of the shaft seal lower part 102, then the sealing strip groove 6 of the shaft seal upper part 101 and the sealing strip 13 are aligned, the shaft seal upper part 101 is installed, then the sealing ring 12 is placed in the sealing ring groove 5 of the casing 4, the sealing ring groove 5 of the shaft seal 1 is aligned with the sealing ring 12, the shaft seal 1 is installed, and then nitrogen is introduced into the nitrogen inlets 2 of the shaft seal upper part 101 and the shaft seal lower part 102, the nitrogen passes through the nitrogen holes 7 arranged at intervals left and right, and then passes through the gaps of the gas sealing teeth 8 in sequence, so that the gaps of each gas sealing tooth 8 are filled with nitrogen, and finally the nitrogen flows out from the nitrogen outlets 3 of the shaft seal upper part 101 and the shaft seal lower part 102.

[0021] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme known in the art are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific embodiments and the like in the specification can be used to explain the content of the claims.

Claims

1. A TRT front shaft seal to prevent gas leakage from coal gas, characterized by, The utility model discloses a sealing assembly of a nitrogen gas sealed centrifugal compressor, which comprises a casing (4), a shaft seal (1) and a rotor (10), wherein the front end of the shaft seal (1) has a smaller diameter than the rear end, the rear end of the shaft seal (1) is bolted to the casing (4), a sealing ring groove (5) is formed at the joint between the rear end of the shaft seal (1) and the casing (4), a sealing ring (12) is arranged in the sealing ring groove (5), the shaft seal (1) is composed of an upper shaft seal (101) and a lower shaft seal (102), the upper shaft seal (101) and the lower shaft seal (102) are both provided with a sealing strip groove (6), a sealing strip (13) is arranged in the sealing strip groove (6), the upper shaft seal (101) and the lower shaft seal (102) are both detachably connected with a plurality of gas sealing teeth (8), the upper shaft seal (101) and the lower shaft seal (102) are provided with a sealing assembly for sealing, the shaft seal (1) is rotatably connected to the rotor (10), the rotor (10) is detachably connected with a plurality of gas sealing pieces (9), and each of the gas sealing teeth (8) and the gas sealing pieces (9) is clamped.

2. A TRT front shaft seal to prevent gas leakage as claimed in claim 1 wherein, The sealing assembly comprises two nitrogen inlets (2) and two nitrogen outlets (3), each of the gas sealing teeth (8) is provided with a nitrogen hole (7), the upper shaft seal (101), the nitrogen inlets (2) and the nitrogen outlets (3) are fixedly connected, and the lower shaft seal (102), the nitrogen inlets (2) and the nitrogen outlets (3) are fixedly connected.

3. A TRT front shaft seal to prevent gas leakage as claimed in claim 2, wherein, The nitrogen hole (7) is conical.

4. A TRT front shaft seal to prevent gas leakage as claimed in claim 2, wherein, The nitrogen holes (7) are arranged in a left-right interval.

5. A TRT front shaft seal to prevent gas leakage as claimed in claim 1 wherein, The vertical section of the sealing strip groove (6) and the sealing strip (13) is trapezoidal, and the horizontal section of the sealing ring groove (5) and the sealing ring (12) is trapezoidal.

6. A TRT front shaft seal to prevent gas leakage as claimed in claim 1 wherein, The sealing ring (12) and the sealing strip (13) are made of fluorine rubber.

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