A kind of detachable bundled tube fixed tube-sheet exchangerTechnical field
The invention belongs to technical field of heat exchangers, be specifically related to a kind of detachable bundled tube fixed tube-sheet exchanger.
Background technology
Heat exchanger conventional in current industry has fixed tube-sheet exchanger (Fig. 1), U-shaped pipe heat exchanger and movable tube sheets heat exchanger three kinds of forms; Fixed tube-sheet exchanger is relative to U-shaped pipe heat exchanger, and tube bank, without U-bend pipeline section, reduces the possibility that heat exchanger tube stress corrosion causes revealing; It is relative to movable tube sheets heat exchanger, and tube bank holds complicated structure without raising the nose above water to breathe; Thus fixed tube-sheet exchanger is because its dependable performance, structure are simple, be convenient to the features such as manufacture, becomes a kind of heat exchanger be most widely used.But also there is certain deficiency relative to U-shaped pipe heat exchanger, movable tube sheets heat exchanger in fixed tube-sheet exchanger, namely restraining two ends is fixed on front tube sheet, back tube sheet, tube bundle sections cannot be extracted out from external shell, as in the special occasion of some medium, need even to change tube bank periodic cleaning and maintenance, fixed tube-sheet exchanger just can not meet these type of technique needs; Now only have and tube bank and housing are all changed, so just greatly reduce the economy of fixed tube-sheet exchanger.
Summary of the invention
For solving the problems of the technologies described above, the object of the invention is to propose a kind of detachable bundled tube fixed tube-sheet exchanger.
The present invention adopts following technical scheme for completing above-mentioned purpose:
A kind of detachable bundled tube fixed tube-sheet exchanger, described fixed tube-sheet exchanger includes front-end pipe box, front tube sheet, housing, heat exchanger tube, deflection plate, back tube sheet and rear end header; Described housing is the structure that rear and front end has shell flange respectively; The outer face being positioned at the shell flange I of housing forward end has positive stop lug boss I, and described positive stop lug boss I is annular, and the external diameter kissing of the internal diameter of described positive stop lug boss I and front tube sheet is joined; Described front-end pipe box is the structure that rear end has channel flange I; The rear end face of described channel flange I has positive stop lug boss II, and the structure of described positive stop lug boss II is identical with the structure of positive stop lug boss I; Described front tube sheet is the circular slab that diameter is greater than housing inner diameter, between shell flange I and channel flange I, and by positive stop lug boss I, that positive stop lug boss II carries out radial direction to it is spacing;
The shell flange II being positioned at housing rear end is connected with described barrel soldering; The rear portion of described shell flange II aperture surface is the conical surface in flaring footpath from left to right; Described rear end header is the structure that front end has channel flange II; The front end face of described channel flange II has positive stop lug boss III; Described positive stop lug boss III is annular, and the external diameter kissing of the internal diameter of described positive stop lug boss III and back tube sheet is joined; Described back tube sheet is the circular slab that diameter is less than housing inner diameter, the periphery of described back tube sheet has the annular short slot installing snap ring; Described back tube sheet is between shell flange II and channel flange II, and it is spacing to carry out radial direction by positive stop lug boss III to it; Described shell flange II is connected as one by bolt with channel flange II; By resilient sealing ring sealing between described back tube sheet and described shell flange II; Described elastic sealing ring is the cone-shaped ring of joining with the conical surface kissing of shell flange II; Sealed by seal washer II between described back tube sheet and channel flange II; The circulus of described snap ring to be cross sectional shape be " L " type, is arranged in the annular short slot of back tube sheet periphery, in order to hold out against described elastic sealing ring.
Described housing is provided with the expansion joint in order to carry out axial displacement compensation to housing; The two ends of described expansion joint are connected with housing respectively.
The detachable bundled tube fixed tube-sheet exchanger of one that the present invention proposes, front tube sheet, back tube sheet all adopt the structure clamped by tube sheet flange and shell flange, fixed tube-sheet exchanger is made to have the function of restraining and can take out, the process requirements to tube-bundle cleaning, maintenance and replacing can be met, housing parts can not be scrapped because tube bank changes, can reuse and reuse, there is good economic benefit; Described housing is arranged little rigidity, Large travel range thin-walled expansion joint to guarantee that whole cylindrical shell has less axial rigidity and axial displacement compensation ability, enough axial displacement can be produced and compensate manufacture deviation, ensure that cylindrical shell front and back ends flange sealing surface effectively can coordinate with forward and backward tube plate sealing face.
Accompanying drawing explanation
Fig. 1 is the structural representation of conventional fixed tube-sheet exchanger in prior art.
Fig. 2 is structural representation of the present invention.
Fig. 3 is the enlarged drawing of I part in Fig. 2.
Fig. 4 is the enlarged drawing of in Fig. 2 II.
In figure: 1, front-end pipe box, 2, front tube sheet, 3, housing, 4, heat exchanger tube, 5, deflection plate, 6, back tube sheet, 7, rear end header, 8, saddle, 9, thin-walled expansion joint, 10, channel flange I, 11, shell flange I, 12, gasket seal I, 13, shell flange II, 14, channel flange II, 15, elastic sealing ring, 16, snap ring, 17, gasket seal II, 18, positive stop lug boss I, 19, positive stop lug boss II, 20, positive stop lug boss III, 21, pull bar.
Detailed description of the invention
With specific embodiment, the present invention is illustrated by reference to the accompanying drawings:
As shown in Figure 2, and composition graphs 3, a kind of detachable bundled tube fixed tube-sheet exchanger, described fixed tube-sheet exchanger includes front-end pipe box 1, front tube sheet 2, housing 3, heat exchanger tube 4, deflection plate 5, back tube sheet 6 and rear end header 7; Described housing 3 is the structure that rear and front end has shell flange respectively; The outer face being positioned at the shell flange I 11 of housing forward end has positive stop lug boss I 18, and described positive stop lug boss I 18 is annular, and the external diameter kissing of the internal diameter of described positive stop lug boss I 18 and front tube sheet is joined; Described front-end pipe box 1 has the structure of channel flange I 10 for rear end; The rear end face of described channel flange I 10 has positive stop lug boss II 19, and the structure of described positive stop lug boss II 19 is identical with the structure of positive stop lug boss I 18; Described front tube sheet 2 is greater than the circular slab of housing 3 internal diameter for diameter, between shell flange I 11 and channel flange I 10, and by positive stop lug boss I 18, that positive stop lug boss II 19 carries out radial direction to it is spacing; Described shell flange I 11 and channel flange I 10 are connected as one by bolt, and at shell flange I 11 and front tube sheet 2, arrange gasket seal I 12 between front tube sheet 2 and channel flange I 10, realize the axial location of sealing and tube bank after tools for bolts ' pretension;
As shown in Figure 2, and composition graphs 4, the shell flange II 13 being positioned at housing rear end is connected with described barrel soldering; The rear portion of described shell flange II 13 aperture surface is the conical surface in flaring footpath from left to right, and conical surface length L determines according to the seal request of reality; Described rear end header is the structure that front end has channel flange II 14; The front end face of described channel flange II 14 has positive stop lug boss III 20, and described positive stop lug boss III 20 is annular, and the external diameter kissing of the internal diameter of described positive stop lug boss III 20 and back tube sheet 6 is joined; Described back tube sheet 6 is less than the circular slab of housing inner diameter for diameter, and the periphery of described back tube sheet 6 has the annular short slot installing snap ring; Described back tube sheet 6 is between shell flange II 13 and channel flange II 14, and it is spacing to carry out radial direction by positive stop lug boss III 20 to it; Described shell flange II 13 is connected as one by bolt with channel flange II 14; Sealed by elastic sealing ring 15 between described back tube sheet 6 and described shell flange II 13; Described elastic sealing ring 15 is the cone-shaped ring of joining with the sealing cone kissing of shell flange II; Sealed by seal washer II 17 between described back tube sheet 6 and channel flange II 14; Described snap ring 16 for cross sectional shape be the circulus of " L " type, its side is for being positioned at back tube sheet periphery annular short slot, opposite side contacts with described elastic sealing ring 15 when described shell flange II connects as one with channel flange II, in order to hold out against described elastic sealing ring; After tools for bolts ' pretension, back tube sheet promotes snap ring, snap ring compresses elastic sealing ring and is installed in the taper draw-in groove that shell flange and tube sheet formed, because elastic sealing ring adopts soft metal to make, under the thrust of snap ring, produce micro-elastic deformation and shell flange, tube plate sealing face fit tightly.
Described housing 3 is provided with the expansion joint 9 in order to carry out axial displacement compensation to housing; The two ends of described expansion joint 9 are connected with housing respectively; When needs change tube bank and gasket seal, first remove the rear header of equipment, because wedge shape sealing ring is installed in the middle of flange and tube sheet, sealing ring may be caused not easily to take out; Then the pull-rod nut of expansion joint is locked, expansion joint is made to produce axial compression displacement, housing axial length reduces, and wedge shape sealing ring can be separated with tube sheet, flange sealing surface, now extracts that namely tube bank realizes restraining, the replacement of front header gasket seal and rear header cone-shaped sealing ring out.