CN209671013U - A kind of nozzle of expansion machine executing agency - Google Patents

Abstract

The utility model discloses a kind of nozzle of expansion machine executing agencies, it is connected respectively with the driving mechanism of peripheral hardware and nozzle including the valve rod through expanding machine spiral case shell, the valve rod both ends, the valve rod is located at the intracorporal part of shell and is arranged with bellows, bellows is fixedly connected between one end and valve rod of nozzle, and the other end is welded with flange；The flange forms end face seal between the end face and the spiral case shell of bellows side.The nozzle actuating mechanism can prevent cryogenic gas from freezing valve rod and sealing element, guarantee effective adjusting of the nozzle actuating mechanism to nozzle air current.

Description

A kind of nozzle of expansion machine executing agency

Technical field

The utility model belongs to air separation plant field, and in particular to a kind of nozzle of expansion machine executing agency.

Background technique

Turbo-expander is a kind of for fields institutes such as air separation, natural gas (oil gas) liquefaction separation and low-temperature grindings Required refrigeration equipment, cardinal principle are to carry out adiabatic expansion using the gas for having certain pressure externally to do work and consume gas The interior energy of itself, to keep gas itself consumingly cooling and achieve the purpose that refrigeration.

Turbo-expander is generally made of expanding machine flow passage component, brake and body three parts.Wherein, expanding machine is logical Stream part is to obtain the key component of low temperature, it includes for air inlet and the spiral case for evenly distributing air-flow, is located inside spiral case The nozzle that expands gas tentatively, the active wheel to rotate under the promotion of expanding gas and drop gas further The diffuser of pressure.

During turbo-expander operation, it is often necessary to the gas flow in nozzle of expansion machine is adjusted, it is right The adjusting of nozzle flow is carried out by nozzle actuating mechanism.Existing nozzle actuating mechanism includes a valve rod, and valve rod one end is set There is the pin being connected with nozzle, nozzle is equipped with the sliding slot matched with the pin, the other end and the driving mechanism phase of valve rod Connection.Cryogenic gas along the surface leakage of valve rod needs that a sealing device is arranged in stem surface in order to prevent, existing Sealing device is sealed generally by the mode of dynamic sealing, and seal member is arranged around valve rod, in valve rod and sealing The position of component contact is sealed by graphite.When using this kind of sealing means, if the temperature of sealing position is too low, It will lead to valve rod to freeze with seal member, can not effectively be adjusted.

Utility model content

The utility model provides a kind of nozzle of expansion machine executing agency, which can prevent cryogenic gas Valve rod and sealing element are freezed, enable nozzle actuating mechanism that steadily the flow of nozzle to be adjusted.

A kind of nozzle of expansion machine executing agency, including the valve rod through expanding machine spiral case shell, valve rod both ends difference It is connected with the driving mechanism of peripheral hardware and nozzle；

The valve rod is located at the intracorporal part of shell and is arranged with bellows, and bellows is solid between one end and valve rod of nozzle Fixed connection, the other end are welded with flange；

The flange forms end face seal between the end face and the spiral case shell of bellows side.

Preferably, the bellows is welded on the valve rod close to one end of nozzle by bushing.

In the utility model, bellows one end is welded on valve rod, and the other end is welded on flange, and bellows and flange are all It is set on valve rod；Flange is located at except spiral case shell, and the contact surface of flange and spiral case shell is sealing surface, when valve rod or so moves When dynamic, the length of bellows is variable, and the position of flange remains unchanged, and is at this time static seal between flange and spiral case shell； Meanwhile valve rod is wrapped in the inside by bellows and flange, can effectively be completely cut off heat transfer, be prevented quilt between valve rod and shell Freeze, to guarantee that nozzle executes effective operation of structure.

Detailed description of the invention

Fig. 1 is the expanding machine partial structure diagram comprising the utility model nozzle of expansion machine executing agency.

Fig. 2 is the schematic diagram of the nozzle actuating mechanism in Fig. 1, in figure, 1: nozzle；2: flange；3: bushing；4: bellows； 5: sealing surface；6: valve rod.

Specific embodiment

The utility model is further described with reference to the accompanying drawing.

By the structural schematic diagram of Fig. 1 and nozzle actuating mechanism shown in Fig. 2 it is found that it includes through swollen that the nozzle, which executes structure, The valve rod 6 of swollen casing body, described valve rod one end (in figure be right end) are connected with driving mechanism, the other end (being left end in figure) and Nozzle 1 is connected, and driving mechanism can drive nozzle vane rotation with driving stem, and then adjust the size of nozzle flow.

It is located at the intracorporal one end of shell in valve rod and is arranged with bellows 4, the housing exterior walls is combined with flange 2, flange 2 and shell To form sealing surface 5 between body, flange is fixed on bellows, can be connected on bellows by way of directly welding, It can be welded on bellows by the connector of additional annular.

The other end (left end in figure) of bellows 4 is welded on valve rod, as a kind of specific embodiment, bellows 4 It is welded on valve rod by a bushing 3.

When needing the flow to nozzle to be adjusted, driving mechanism driving stem carries out mobile (being left and right in figure The movement in direction), since bellows 4 has certain elasticity, flange 2 and spiral case shell can keep static seal state, meanwhile, Since valve rod 6 is wrapped in inside by bellows 4, cryogenic gas and valve stem contacts can be prevented, can be effectively prevented valve rod with Spiral case freezes together, and plays the role of completely cutting off heat, guarantees effective operation of executing agency.

The technical solution of the utility model and beneficial effect is described in detail in above-described specific embodiment, It should be understood that be not intended to limit the utility model the foregoing is merely the most preferred embodiment of the utility model, it is all at this Any modification, supplementary, and equivalent replacement etc. done in the spirit of utility model, should be included in the guarantor of the utility model Within the scope of shield.

Claims (2)

1. a kind of nozzle of expansion machine executing agency, including through expanding machine spiral case shell valve rod, the valve rod both ends respectively with The driving mechanism of peripheral hardware is connected with nozzle, which is characterized in that

The valve rod is located at the intracorporal part of shell and is arranged with bellows, and bellows is fixed between one end and valve rod of nozzle to be connected It connects, the other end is welded with flange；

The flange forms end face seal between the end face and the spiral case shell of bellows side.

2. nozzle of expansion machine executing agency according to claim 1, which is characterized in that the bellows is close to one end of nozzle It is welded on the valve rod by bushing.