CN203585692U - Expansion joint device used in vacuum state - Google Patents

Abstract

The utility model discloses an expansion joint device used in a vacuum state. The expansion joint device comprises a casing and a lining, wherein the lining is arranged in the casing, one end of the casing is connected with a process pipeline through a flange plate, the other end of the casing is fixed on production equipment through a flange plate, a connector is arranged in the middle of the outer surface of the casing, the outer part of the connector is connected with a vacuum pipeline, and the connector is also communicated with a space between the inner surface of the casing and the outer surface of the lining. As the outer part of the connector is connected with the vacuum pipeline, and the connector is also communicated with the space between the inner surface of the casing and the outer surface of the lining, the expansion joint device can ensure that pressures on the two sides of the teflon lining are basically consistent at any time, the teflon lining only bears static pressure produced by medium, the lining cannot deform due to a pressure difference between the two sides during work, a condition that the lining cannot easily fall off in the work process is ensured, and the service life of the lining is prolonged. The expansion joint device has the advantages of simple structure, convenience in installation and repair, and stable and reliable work.

Description

A kind of expansion joint device using under vacuum state

Technical field

The utility model relates to a kind of expansion joint device that prevents tetrafluoro inner lining damage under vacuum state.

Technical background

In chemical process, need Vacuum Concentration or distillation system, wanting to require employing tetrafluoro material according to medium in vacuum concentration system, it is liner, tetrafluoro liner and steel shell do not have cementability, for preventing that tetrafluoro liner is inhaled flat breakage under vacuum state, the existing tetrafluoro liner using under vacuum state is at the interior vacuum ring of having installed, and vacuum ring is made with stainless steel or carbon steel outsourcing four fluorine tube.In use, due to liner collapses, vacuum ring easily comes off, or vacuum ring distortion, causes vacuum ring joint to puncture tetrafluoro liner, thereby causes damage of internal lining.

Summary of the invention

For the deficiencies in the prior art part, the utility model aims to provide a kind of expansion joint device using under vacuum state, guarantees liner difficult drop-off in the course of the work, and not fragile.

For solving the problems of the technologies described above, the technical solution adopted in the utility model: a kind of expansion joint device using under vacuum state, comprise housing and liner, within liner is installed on housing, housing one end connects by flange plate and process pipe, and the housing the other end is fixed on manufacturing mechanism by flange plate, and at the middle part of housing, outer surface arranges interface, the outside vacuum pipe that connects of this interface, this interface is also connected the space between shell inner surface and liner outer surface.

Adopt technique scheme, because interface is outside, connect vacuum pipe, interface is also connected the space between shell inner surface and liner outer surface, expansion joint device all can guarantee that the pressure of tetrafluoro liner both sides is basically identical at any time like this, be that tetrafluoro liner only bears the static pressure that medium produces, liner is at work because of the pressure reduction on two sides, and produces deformation, guarantee liner difficult drop-off in the course of the work, extended the working life of liner.

The utility model is simple in structure, and installation and maintenance are convenient, and working stability is reliable.

Accompanying drawing explanation

Fig. 1 is the utility model structural representation;

In accompanying drawing: 1 housing 2 liner 3 vacuum pipe 4 flange plate 5 process pipe 6 manufacturing mechanisms.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As shown in Figure 1, a kind of expansion joint device using under vacuum state, comprise housing 1 and liner 2, within liner 2 is installed on housing 1, liner 2 is made by PTFE sintering, housing 1 adopts stainless steel material to make, housing 1 one end connects by flange plate 4 and process pipe 5, what process pipe 5 was carried is to need concentrated medium, housing 1 the other end is fixed on manufacturing mechanism 6 by flange plate 4, at the middle part of housing 1 outer surface, be provided with two interfaces, two outside vacuum pipes 3 that connect of interface, this interface is also connected the space between housing 1 internal surface and liner 2 outer surfaces, the degree of vacuum in space between housing 1 internal surface and liner 2 outer surfaces is the same with the degree of vacuum of vacuum pipe 3 like this, when working, only bears tetrafluoro liner 2 the static pressure effect of medium, stop often to produce telescopic shape change phenomenon.

Claims (1)

1. the expansion joint device using under vacuum state, comprise housing (1) and liner (2), within liner (2) is installed on housing (1), housing (1) one end connects by flange plate (4) and process pipe (5), housing (1) the other end is fixed on manufacturing mechanism (6) by flange plate (4), it is characterized in that: the middle part outer surface at housing (1) arranges interface, the outside vacuum pipe (3) that connects of this interface, this interface is also connected the space between housing (1) internal surface and liner (2) outer surface.

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