CN2231584Y - Hydraulic tube expander - Google Patents

Abstract

The utility model discloses a hydraulic tube expander which belongs to the expansion connecting tool of a tube heat exchanger. The hydraulic tube expander comprises a shaft 1 with a flange, the shaft center is provided with a central hole 2, and a hole 3 communicated with the central hole 2 is arranged on the side wall; the other end of the shaft 1 is sheathed with a gasket 5 and screw nuts 6 connected with the gasket 5. Sealing rings 4 which are sheathed on the shaft and contact to the inner surfaces of the flange and the gasket are arranged on the inner surfaces of the flange and the gasket. The utility model has the advantages of simple structure and convenient operation; the expansion connecting position is not limited, and the expansion connecting depth and pressure can be adjusted; after the expanding connection, the heat exchanger can bear the proper extreme pressure of a tube, and thus, the hydraulic tube expander is an ideal expansion connecting tool.

Description

The fluid power tube expander

The utility model relates to a kind of tube expander, and specifically a kind of fluid power tube expander belongs to tubular heat exchanger expanded joint technical field.

Existing expanded joint method mainly contains following several: 1, mechanical expanded joint method, its deficiency is, only be applicable to the low-voltage technology field, and tension force is difficult to control, expanded joint position leakage that strength is little, strength is big, it can destroy the mechanical performance of tube sheet, the expanded joint position is leaked, even can cause scrapping of equipment, its expanded joint position and the degree of depth are limited, and the general degree of depth can not surpass 4-5cm.2, explosive expansion joint method, the technical performance extra-heavy of this method is difficult to grasp, and narrow tube is difficult to use this method.3, welding generally uses inside and outside this France, and be mainly used in the tubulation expanded joint of mesohigh heat exchanger, and have the following disadvantages: 1. tubulation and tube sheet welding stress cause tube plate deformation; 2. the stress that the temperature difference causes in tube sheet and tubulation welding stress and the use concentrates on welding bead and heat affected area, often causes fracture; When 3. welding, heat affecting causes phase transformation, easily causes intercrystalline corrosion; 4. especially severe is corroded at the dead angle in gap between tubesheet holes and the tubulation, and reduce equipment life greatly; 5. two kinds of different metals (as tube sheet is steel, and tubulation is a copper) are difficult to welding.And preceding two kinds of methods have also only solved the following mesolow expanded joint technology of 38kg/cm2.Along with the continuous expansion of industry production scales such as chemical industry, oil refining, chemical fertilizer, thermal power generation, more and more higher to the expanded joint specification requirement of little caliber (tubulation) heat exchanger, above-mentioned three kinds of expanded joint technology, especially mechanical expanded joint and solder technology are difficult to meet the demands.

The purpose of this utility model is, provides a kind of simple in structure, easy to operate, the expanded joint degree of depth, expanded joint adjustable in pressure, and the expanded joint position is unrestricted, and the pressure that heat exchanger bears behind the expanded joint can reach the tube expander of the pipe pressure that bears itself.

Technical solution of the present utility model is, it comprises the axle 1 of an end band rib, establish and the centre bore 2 that communicates with the rib end in this axle center, establish the hole 3 that communicates with centre bore 2 on its stage casing sidewall, its other end is with packing ring 5 and connected nut 6, on the opposite face of rib, packing ring, the sealing ring 4 that is in contact with it and is enclosed within on the axle is arranged all.The angle in hole 3 is 0＜α＜90 ° on centre bore 2 and the sidewall.The α angle is big more, and the intensity of axle is more little, and the pressure that is born is more little, and on the contrary, then Zhou intensity is big, and the pressure that bears is big.General α=45 ° is for well.Operation principle is: the official's device that should expand reaches to be treated in the expand tube, oil pressure pump is transported to oil in the centre bore 2 by conduit, oil in the centre bore 2 flows on the outer wall of axle by hole 3, and be limited between two sealing rings 4, oil pressure is applied to by on the inwall of expand tube, is expanded outwardly by the expand tube perisporium, treat that plastic deformation takes place for it, and during tube sheet generation strain, oil pressure pump is removed pressure, and oil returns in the oil pressure pump by hole 3 and centre bore 2 and petroleum pipeline.Expanded joint finishes.In like manner, can use the same method other pipe of expanded joint.By selecting the thickness of packing ring 5, can adjust by the degree of depth of expand tube.If the thickness of packing ring 5 is big, then the distance between two sealing rings 4 shortens, and the expanded joint degree of depth shoals; If the thickness of packing ring 5 is little, then the distance variable between two sealing rings 4 is big, and the expanded joint degree of depth increases.This method is specially adapted to the expand tube of the above specification of expanded joint Ф 25m/m.

Because the utility model adopted above-mentioned solution, therefore compared with prior art, have simple in structurely, easy to operate, the expanded joint position is unrestricted, expanded joint power and expanded joint depth-adjustment, the expanded joint effect can reach the maximum pressure that pipe itself is born, as 400kg/cm ²Compare with welding, working (machining) efficiency can improve more than 3 times, and cost reduces by 60%, can improve 2-5 the service life of the heat exchanger behind the expanded joint doubly, is not subjected to the restriction of expanded joint tubulation and tube sheet metal material.And when changing tubulation, do not damage tube sheet, improved the service life of tube sheet.Also can be used for the steam boiler that vapor (steam) temperature is lower than 400 ℃ with the heat exchanger behind this method expanded joint.

Provide embodiment of the present utility model below in conjunction with accompanying drawing, be used for further specifying the utility model.

Fig. 1-structural representation of the present utility model;

The A-A profile of Fig. 2-Fig. 1.

By shown in Figure 1.Axle 1 two ends are equipped with screw thread, and the screw thread of band rib end is in order to be connected with petroleum pipeline, and the screw thread of the other end is in order to allow nut 6 revolve thereon.The axle 1 of band rib end be step-like, touches mutually with a sealing ring 4 that is socketed on spool 1 on the inner face of second step.Another sealing ring touches with the packing ring 5 that is socketed on the axle 1 mutually with its back separated by a distance, and the outside of packing ring 5 is and its nut that closely touches mutually 6.Operation principle is the same.

Claims (2)

1. A kind of fluid power tube expander, it is characterized in that, it comprises the axle (1) of an end band rib, establish and the centre bore that communicates with the rib end (2) in this axle center, establish its other end of hole (3) that communicates with centre bore (2) on its stage casing sidewall and be with packing ring (5) and connected nut (6), on the opposite face of rib, packing ring, the sealing ring (4) that is in contact with it and is enclosed within on the axle is arranged all.
2. By the described tube expander of claim 1, it is characterized in that 2, the angle α of described hole (3) and centre bore (2) is greater than zero degree, less than 90 °.

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