CN2685788Y

CN2685788Y - External heat type rotary furnace sealing structure

Info

Publication number: CN2685788Y
Application number: CN 200320109656
Authority: CN
Inventors: 李彩霞; 高鸿海; 王玉春
Original assignee: Lanzhou Refinery & Chemical Design Institute
Current assignee: Lanzhou Refinery & Chemical Design Institute
Priority date: 2003-10-09
Filing date: 2003-10-09
Publication date: 2005-03-16
Anticipated expiration: 2013-10-09

Abstract

An external heat type rotary furnace sealing structure of the utility model belongs to a sealing structure of chemical equipment. The utility model is provided with a sealing seat on a furnace end feed box or a furnace cauda discharge box. A sealing gasket is provided between the sealing seat and a revolving drum backing ring. The bulging end face of the press cap tightly presses the end face of the sealing gasket. The press cap is connected with the sealing seat by a bolt. The utility model has the advantages of stable sealing property, safety and reliability. The utility model can change the filler with convenience, adjust the hold-down bolt of the press cap of the filler at any time and improve the sealing condition.

Description

External-heating revolving stove hermetically-sealed construction

Technical field

The utility model relates to a kind of hermetically-sealed construction of chemical industry equipment, particularly external-heating revolving stove hermetically-sealed construction.

Background technology

In general Catalyst Production device, the swinging roaster is arranged all, rotating cylinder in the middle of the swinging roaster partly rotates, and the burner of roaster and stove tail are fixed, like this at rotating cylinder and burner, the binding site of rotating part and standing part has just appearred in stove tail connecting portion, these two binding sites are exactly two leakage points, under positive pressure, if these 2 have leakage, can cause the loss and the environmental pollution of material, and under condition of negative pressure,, can make air enter the reaction that participates in material in the rotating cylinder at these 2 if having leakage, and produce underproof product, so just seem very important in this two-part design that is sealed in roaster.

Because the diameter of rotary furnace is generally all bigger, at least more than 1 meter, so rotary furnace burner, the sealing at stove tail place can not as the sealing of rotating shaft with the mechanical seal and the packing seal of standard, be used at present on the kiln be sealed with a variety of: labyrinth type, axial contact, contact radially, formula is blocked in soft packing, a kind of end face seal with bellows grows up recent years, it is equivalent to the bellows mechanical seal of rotating shaft, but because the size of stove is generally bigger, so in use its effect is also not fully up to expectations for it, leakage happens occasionally, and the cost eighteenth of the twenty is expensive, must blowing out during replacing.

The end face seal of band bellows is to be connected a corrugated expansion joint at the burner material feeding box with stove tail feed box place, on compensator, fix a stationary ring again, contact with the rotating ring on being fixed on rotating cylinder, come the compensating axial play and rotating ring and stationary ring are in contact with one another and reach the purpose of sealing by the axial rigidity of bellows, the advantage of this sealing is: seal with the formula of blocking and compare, because the parts of mechanical seal all are metal materials, so it is many to look service life; Because mechanical seal has compensation mechanism, after correct the installation, do not resemble the formula of blocking and seal and often to adjust; Because the end face contact area of mechanical seal is little, the friction power attenuation is little, only for blocking 20%～30% of formula sealing; Because the contact site of mechanical seal and cylindrical shell does not have relative motion, therefore cylindrical shell is not damaged.But also exist some shortcomings, mainly be: because it is mechanical seal, its structure is than other seal structure complex, and all is that the processing request of machined piece, especially rotating ring and stationary ring is high especially; Assembling is difficulty, changes inconvenience, particularly turn round when undesired, the difficulty of taking emergency measures and since its structures shape necessary blowing out could overhaul, brought great inconvenience so cover with excellent operation to stove stable.Because furnace diameter is generally bigger, so the sealing ring size is also bigger, easy deformation after being heated, cause rotating ring can not well contact and cause seal failure with stationary ring, and because the rotating cylinder axial dimension is bigger, the back flexural deformation of being heated is bigger, so rotating ring is tilted, rotating ring can not well be contacted with stationary ring and causes seal failure.Sylphon seal operational circumstances under the bigger condition of negative pressure is better, but under positive pressure and under little condition of negative pressure, the axial rigidity in back diminishes owing to be heated, thrust between sealing surface is less because rotating cylinder length is generally all more than 10 meters, and in temperature when higher, its axial elongation amount is very big, though so when bellows be heated rigidity diminish after its elongation can compensate the axial elongation amount of rotating cylinder, its thrust is very little, can not satisfy the desired pressure of sealing and causes material to leak.

Another kind is to block the formula hermetically-sealed construction, and its version is to put a sealing gasket between metal compaction ring and burner material feeding box or stove tail feed box, with bolt metal compaction ring and burner material feeding box or stove tail feed box is fixed together.Because this hermetically-sealed construction is too simple, the thrust of metal compaction ring is not enough, and because the filler in the middle of being pressed in is extremely thin, comes off in equipment easy wearing and tearing in service, thereby cause seal failure.

Summary of the invention

The purpose of this utility model is exactly to overcome above-mentioned deficiency, and a kind of multilayer packing that provides is done filler, can be adjusted the hermetically-sealed construction of gland at any time.

The solution that realizes the utility model purpose is a kind of external-heating revolving stove hermetically-sealed construction, comprise burner material feeding box or stove tail feed box (5), rotating cylinder (6), rotating cylinder grommet (7), particularly burner material feeding box or stove tail feed box (5) are provided with seal box (4), between seal box (4) and rotating cylinder grommet (7), be provided with sealing gasket (3), the protrusion end face of gland (1) withstands the end face of sealing gasket (3), and gland (1) connects together by bolt (2) and seal box (4).

Sealing gasket (3) is made with rubber, asbestos, plastics, filler.

The utility model has the advantages that we have used the multilayer packing to do filler again because sealing gasket is packing seal, sealing property is stable, safe and reliable, do not have very big leakage rate during seal failure yet, and can adjust the hold-down bolt of gland at any time, improve air-proof condition; . it is convenient to change filler, if filler lost efficacy, as long as dismantle gland, just can change filler and does not influence the normal operation of stove, provides reliable assurance for stove stable covers with excellent operation; Low price is because only change filler, so both economical reasonable after the seal failure.Because the distortion of rotating cylinder can influence the gland sealed result of use, so we have improved the machining accuracy of rotating cylinder in this design, the deflection of rotating cylinder is reduced, can improve the gland sealed result of use like this.And comparatively speaking, packing seal is stronger to the self-regulation ability of rotating cylinder distortion, because filler is flexible, has enough elasticity and plasticity, can compensate because rotating cylinder is out of shape the gap of causing, so packing seal has its superiority in this respect.

Description of drawings

Fig. 1 is a structural representation of the present utility model, and burner material feeding box or stove tail feed box 5 have been drawn the part relevant with hermetically-sealed construction with 6 of rotating cylinders, and remainder has omitted.

Fig. 2 is the structural representation that background technology is blocked the formula sealing, and 8 is rotating cylinders among the figure, the 9th, and the metal compaction ring.

Fig. 3 is the structural representation of background technology sylphon seal, and 10 is rotating cylinders among the figure, the 11st, and rotating ring, the 12nd, stationary ring, the 13rd, bellows.

The specific embodiment

Burner material feeding box or stove tail feed box 5 are provided with seal box 4; make the toroidal cavity that forms an opening between burner material feeding box or stove tail feed box 5, seal box 4 and the rotating cylinder grommet 7; sealing gasket 3 is placed in this cavity; the annular of gland 1 is protruded the opening part that end face is arranged on toroidal cavity; compress the end face of sealing gasket 3; gland 1 connects together by bolt 2 and seal box 4, and rotating cylinder grommet 7 is provided in a side of on the rotating cylinder 6, is to damage too early because of friction for the barrel of protecting rotating cylinder 6.Sealing gasket 3 usefulness rubber, asbestos, plastics are made.

Like this when the swinging roaster is worked, driven by motor rotating cylinder 6 rotates, the rotating cylinder grommet 7 that is connected with rotating cylinder 6 also rotates, burner material feeding box or stove tail feed box 5 and do not rotate with working seal box 4, gland 1 and the sealing gasket 3 be connected form friction and sealing at rotating cylinder grommet 7 and sealing gasket 3.Burner material feeding box or stove tail feed box 5 are sealed in the leakage of this point.

Claims

1, a kind of external-heating revolving stove hermetically-sealed construction, comprise burner material feeding box or stove tail feed box (5), rotating cylinder (6), rotating cylinder grommet (7), it is characterized in that burner material feeding box or stove tail feed box (5) are provided with seal receptacle (4), between seal receptacle (4) and rotating cylinder grommet (7), be provided with sealing gasket (3), the protrusion end face of gland (1) withstands the end face of sealing gasket (3), and gland (1) connects together by bolt (2) and seal receptacle (4).

2,, it is characterized in that said sealing gasket (3) makes with rubber, asbestos, plastics, filler according to the said external-heating revolving stove of claim 1 hermetically-sealed construction.