CN201159461Y - A steam turbine cylinder connection bolt flame heater - Google Patents

Abstract

The utility model discloses a steam turbine cylinder connecting bolt flame heater, which is connected with a flame spray gun, which includes a diffusion nozzle, a mixing head, a combustion chamber, a heating pipe arranged in sequence from top to bottom, and also includes a compressed air connected with the mixing head joint and the return sleeve arranged on the upper part of the heating pipe, wherein: the diffusion nozzle is connected with the flame spray gun, and the inner cavity of the diffusion nozzle is connected with the inner cavity of the combustion chamber; the compressed air joint is connected with the mixing head The outer cavity is connected, and the compressed air joint is externally connected with compressed air; the mixing head is set outside the diffusion nozzle and connected with the outer cavity of the combustion chamber; the inner cavity of the combustion chamber is connected with the inner hole of the heating pipe; The return sleeve is set on the upper part of the heating pipe. The utility model relates to a steam turbine cylinder connection bolt flame heater, which improves the heat tightening heating efficiency of the steam turbine cylinder connection bolts, reduces heat energy loss to save energy, and prevents overheating damage to the bolts.

Description

A steam turbine cylinder connection bolt flame heater

technical field

The utility model relates to the mechanical field, in particular to a steam turbine cylinder connecting bolt flame heater.

technical background

The large-sized connecting bolts of steam turbine cylinders need to be heated during the manufacturing and installation stages to make the bolts elongate to a certain extent, and then tightened, so that the bolts can produce the pre-tightening force required by the design and achieve the effect of cylinder sealing.

The existing bolt heating technology generally adopts the following two heating methods:

1. Use an electric heater to heat the bolt through the heating hole in the center of the bolt. Due to the slow heating speed and low efficiency of electric heating, the connecting bolts of the cylinder are closely connected with the material of the cylinder body. Therefore, a large amount of heat energy is transferred to the material of the cylinder body through the bolts. Coupled with the defects of the electric heater itself, this will produce the following: Adverse effects: 1. The loss of heat energy is large, resulting in a lot of waste of electric energy; 2. The heating time is too long, the cylinder absorbs a lot of heat, causing the temperature of the cylinder flange surface to rise at the same time, resulting in the thickening of the cylinder flange at the same time, thus making the The relative elongation of the bolts is insufficient to achieve one-time heat tightening, and repeated heating is often required, which prolongs the operation period; 3. Due to insufficient heat at the bottom of the electric heater, when used for heating large-sized short bolts, the efficiency is low, especially Obvious; 4. The service life of electric heater resistance alloy wire is short, and the loss of heater is large; 5. Due to the large specifications of steam turbine cylinder connecting bolts, and the combination of heating hole diameter and depth parameters, the electric heater has poor versatility and is not convenient for production. Administration and Use.

2. The flame is directly heated, and the bolt is directly heated by the flame spray gun, and the heating flame is in direct contact with the heating hole in the center of the bolt. Although the heating efficiency of this heating method is high, because the flame directly contacts the bolt, it will damage the bolt material to some extent, and this heating method requires that the central heating hole of the bolt and the screw hole of the cylinder are all through holes, so the application of this heating method is extremely limited. , cannot be widely used.

Contents of the invention

The purpose of the utility model is to overcome the defects of the prior art, and provide a steam turbine cylinder connection bolt flame heater, which improves the heating efficiency of the steam turbine cylinder connection bolt thermal tightening, reduces heat loss to save energy, and prevents overheating damage to the bolt.

The technical solution to achieve the above object is: a steam turbine cylinder connected bolt flame heater, which is connected to the flame spray gun, wherein it includes a diffusion nozzle, a mixing head, a combustion chamber, a heating pipe arranged in sequence from top to bottom, and also includes a mixing The compressed air joint connected to the head and the return sleeve set on the upper part of the heating tube, wherein:

The diffusion nozzle is connected to the flame spray gun, and after receiving the combustible gas mixture from the flame spray gun, it is sprayed and burned into the combustion chamber, and the inner cavity of the diffusion nozzle is connected with the inner cavity of the combustion chamber;

The compressed air joint is connected to the outer cavity of the mixing head, and the compressed air joint is externally connected with compressed air;

The mixing head is set outside the diffusion nozzle and connected with the outer cavity of the combustion chamber;

The inner cavity of the combustion chamber is connected to the inner hole of the heating pipe so that the high-temperature mixed flame gas generated by injection combustion through the diffusion nozzle is gathered in the combustion chamber and then surrounded by compressed air and driven to flow to the heating pipe;

The return sleeve is set on the upper part of the heating pipe, and there is a gap opening downward between the inner wall of the return sleeve and the heating pipe to guide the heated exhaust gas into the return pipe. The gap is arranged in the return sleeve and The exhaust passage communicated with the outside is connected to discharge exhaust gas.

In the above steam turbine cylinder connected bolt flame heater, wherein, the gap between the inner wall of the return sleeve and the heating pipe is in the shape of a ring cylinder.

In the above-mentioned steam turbine cylinder-connected bolt flame heater, the exhaust channel is arranged obliquely, and the end connected to the gap of the heating pipe is arranged obliquely upward and outwardly to connect with the outside world.

The beneficial effects of the utility model are: the utility model has the characteristics of high heating efficiency, no damage to bolts, simple and safe operation, strong versatility, long service life and wide application range. It uses high-temperature flame gas to directly heat, with fast heating speed and very high heating efficiency (8 to 10 times the heating efficiency of electric heaters). Compared with electric heaters, its heat loss is greatly reduced, which is very conducive to energy saving and consumption reduction; Compared with direct flame heating, when the flame heater is heated, the combustion flame does not directly contact the bolt, which effectively protects the bolt material from high temperature damage. Full combustion, no toxic gas emissions, no pollution to the environment, safe and reliable to use. For bolt heating holes with different depths, the length of the heating tube of the heater can be adjusted to meet the requirements of use. The adjustment is simple and convenient, making the heater highly versatile. The main elements of the heater are made of alloy steel, which has a long service life, and even if one of the elements is damaged after long-term use, it can be replaced separately, and the maintenance cost is low. The utility model is not only applicable to the heating of steam turbine cylinder bolts, but also applicable to large-sized bolts of other mechanical products.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Detailed ways

The utility model will be further described below in conjunction with accompanying drawing.

Please refer to Fig. 1, a kind of steam turbine cylinder connecting bolt flame heater of the present utility model is shown in the figure, links to each other with the flame spray gun, and it comprises the diffusion nozzle 1 that is arranged successively from top to bottom, mixing head 2, combustion chamber 3, The heating tube 4 also includes a compressed air joint 5 connected to the mixing head 2 and a return sleeve 6 arranged on the top of the heating tube 4, wherein:

Diffusion nozzle 1 links to each other with flame spray gun (not shown in the figure), receives the combustible mixture gas that flame spray gun comes to spray and combusts and enters combustion chamber 3, and the inner cavity 11 of this diffusion nozzle 1 is connected with the inner cavity 31 of combustion chamber 3;

The compressed air joint 5 is connected to the outer cavity 21 of the mixing head 2, and the compressed air joint 5 is externally connected with compressed air;

The mixing head 2 is set outside the diffusion nozzle 1 and connected with the outer cavity 32 of the combustion chamber 3;

The inner cavity 31 of the combustion chamber 3 is connected with the inner hole 41 of the heating pipe 4 so that the high-temperature mixed flame gas generated by jet combustion through the diffusion nozzle 1 is gathered in the combustion chamber 3 and then surrounded by compressed air and driven to flow to the heating pipe 4;

The return sleeve 6 is set on the upper part of the heating pipe 4. There is a gap 61 opening downward between the inner wall of the return sleeve and the heating pipe 4 to guide the heated exhaust gas into the return pipe 6. The gap 61 is connected with the return sleeve 6. The exhaust channel 62 inside and communicated with the outside is connected to discharge the exhaust gas. The gap 61 is in the shape of a ring column. The exhaust channel 62 is arranged obliquely.

The main components of the utility model are made of alloy steel, which has a long service life, and even if a certain component is damaged after long-term use, it can be replaced separately, and the maintenance cost is low.

The working principle of the utility model is: the heating tube 4 of the heater is placed in the central heating hole of the bolt. The combustible mixed gas from the flame spray gun is sprayed and burned through the diffusion nozzle 1, and the high-temperature mixed flame gas generated by the combustion gathers in the combustion chamber 3, and is surrounded by compressed air and driven to flow to the heating tube 4. After passing through the inner hole 41 of the heating tube 4, It flows out from the bottom of the heating tube 4 and enters the circular heating area between the outer wall of the heating tube 4 and the inner wall of the bolt center hole to heat the bolt, and the heated exhaust gas is guided and discharged through the return sleeve 6 . The temperature of the heater can be realized by adjusting the combustible gas flow. For bolts with different hole diameters and hole depths, the heating effect can be optimized by adjusting the compressed air pressure.

The utility model has been described in detail above in conjunction with the embodiments of the accompanying drawings, and those skilled in the art can make various changes to the utility model according to the above description. Therefore, some details in the embodiments should not constitute a limitation to the utility model, and the utility model shall take the scope defined by the appended claims as the protection scope of the utility model.

Claims (3)

1. steam turbine attachment bolt fired heater, link to each other with flame gun, it is characterized in that, it comprises divergent nozzle, mixing head, combustion chamber, the heating tube that sets gradually from top to bottom, the backflow cover that also comprises the compressed air joint that links to each other with mixing head and be arranged at heating tube top, wherein:

Described divergent nozzle links to each other with flame gun, accept the burning mixture of flame gun after spray combustion enter the combustion chamber, the inner chamber of this divergent nozzle links to each other with the inner chamber of described combustion chamber;

Described compressed air joint links to each other with the exocoel of mixing head, this compressed air joint external compressed air;

Described mixing head is placed in outside the described divergent nozzle, and links to each other with the exocoel of combustion chamber;

The inner chamber of described combustion chamber links to each other with the endoporus of described heating tube and flows to heating tube assembling the back in the combustion chamber via the high temperature mixing flame gas that the divergent nozzle spray combustion produces by compressed air encirclement drive;

Described backflow cover is placed in the top of heating tube, the gap that has downwardly facing opening between the inwall of this backflow cover and the described heating tube is inducted into return duct with the tail gas after will heat, and this gap is overlapped interior and linked to each other so that tail gas is discharged with exhaust passage that the external world communicates with being arranged to reflux.

2. steam turbine attachment bolt fired heater according to claim 1 is characterized in that, the gap between described backflow cover inwall and the heating tube is annulated column shape.

3. steam turbine attachment bolt fired heater according to claim 2 is characterized in that described exhaust passage is obliquely installed, and its end that links to each other with the gap of heating tube is tilted to outwards to be provided with extraneous and is connected.

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