CN201916006U - Ferrite vapor lock - Google Patents

Abstract

The utility model discloses a ferrite vapor lock which comprises a ferrite vapor lock ring, wherein the middle of the ferrite vapor lock ring is provided with at least one groove along the circle direction, each groove is internally provided with a movable tooth, and a spring is arranged at the back of the movable tooth; and the spring is fixed on the movable tooth by a bolt. The middle of the ferrite vapor lock ring is additionally provided with the movable tooth, and the back of the movable tooth is provided with a small-elastic force spring, so that the backward movement of the movable tooth is realized, the micro-clearance or zero-clearance seal is realized, and the vacuum leakproofness of a set is improved.

Description

The ferrite packing

Technical field

The utility model relates to a kind of packing, relates in particular to a kind of ferrite packing, belongs to the turbomachinery field of sealing technology.

Background technique

Steam turbine has stator and rotor two large divisions.Rotor high-speed rotation when work, stator is fixed, so must keep certain clearance between rotor and the stator, does not make the phase mutual friction.When vapor stream was crossed each level work of steam turbine, pressure, temperature descended step by step, existed pressure reduction in the dividing plate both sides.When moving vane has degree of reaction, also exist pressure reduction before and after the moving vane.Steam flows through the acting from the passage of stator, movable vane except the overwhelming majority, and sub-fraction can flow through from various gaps and not do work, and becomes a kind of loss, has reduced the efficient of unit.

Rotor also must pass cylinder, is supported on the bearing, also must leave the gap herein.For the front end of high pressure cylinder two ends and intermediate cylinder, the vapor pressure in the cylinder will have steam to spill herein greater than external atmospheric pressure, reduce unit efficiency, and cause the loss of part water of condensation., pass in the gap of cylinder because of the vapor pressure in the cylinder is lower than extraneous atmospheric pressure at the two ends of the exhaust end of intermediate pressure cylinder and low pressure (LP) cylinder, will have air to bleed in the cylinder at main shaft.Because air can not condense, thereby has reduced degree of vacuum, reduced steam acting ability in vapour condenser.

In order to reduce the gas leakage in the above-mentioned gap everywhere, guarantee the normal safe operation of steam turbine again, the spy is provided with various packings.These packings can be divided into flow passage component packing, diaphragm gland and shaft end gland seal three major types.With regard to working principle, this three classes packing all belongs to labyrinth gland.

Shaft end gland seal mostly is the stage teeth packing, all is designed to multi-segment structure, is made up of several labyrinth rings 1 for every section, between adjacent two sections steam chest is set, as shown in Figure 1.Gland sealing gear is processing or is embedded on the packing segmental arc that the packing segmental arc is divided formation labyrinth ring in the annular channel that can be inlaid in the labyrinth casing inwall again, and whole labyrinth ring is made up of 6 ~ 8 sections packing segmental arcs.The packing segmental arc adopts yielding support, promptly connects a spring sheet with pin on the periphery of each segmental arc, embeds conduit rear spring rear spring sheet the supporting surface of segmental arc and conduit is fitted.Because the labyrinth seal structure of existing vapour (gas) sealing, there is big gap between itself and the rotor.Must increase air leakage like this, thereby unit efficiency is reduced.The material of labyrinth seal is harder simultaneously, and easy and rotor rubs, the damage rotor.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of ferrite packing, can avoid and friction rotor, can not damage rotor, and has improved the vacuum tightness of unit.

The utility model is to solve the problems of the technologies described above the technological scheme that adopts to provide a kind of ferrite packing, comprise the ferrite labyrinth ring, wherein, along the circumferential direction be provided with one groove in the middle of the described ferrite labyrinth ring at least, be provided with movable tooth in the described groove, spring is equipped with at described movable tooth rear portion.

Above-mentioned ferrite packing, wherein, described spring by screw on movable tooth.

The utility model contrast prior art has following beneficial effect: the ferrite packing that the utility model provides, by in the middle of the ferrite packing, installing a movable tooth additional, little elastic spring is equipped with at movable tooth rear portion, to realize the yielding of movable tooth, realize the sealing of microgap or zero clearance, thereby improved the vacuum tightness of unit.

Description of drawings

Fig. 1 is existing gland seal structure schematic representation;

Fig. 2 is the utility model ferrite labyrinth ring cutaway view Amplified image.

Among the figure:

1 ferrite labyrinth ring, 2 movable tooth 3 springs

4 screws, 5 rotors

Embodiment

The utility model will be further described below in conjunction with drawings and Examples.

Fig. 2 is the utility model ferrite labyrinth ring cutaway view Amplified image.

See also Fig. 2, Fig. 2 is the cutaway view Amplified image along A-A line among Fig. 1, and the ferrite packing that the utility model provides comprises ferrite labyrinth ring 1, in the middle of ferrite packing 1, along the circumferential direction processes one or multi-channel groove; In groove, install movable tooth 2 additional; Little elastic spring 3 is equipped with at movable tooth 2 rear portions, realizing the automatic yielding of movable tooth, and then makes and realizes microgap or zero clearance sealing between packing and the main shaft.Therefore, the ferrite packing that the utility model provides can be avoided and rotor 5 frictions, can not damage rotor, and improve the vacuum tightness of unit.

In order to prevent that spring 3 from coming off, little elastic spring 3 is fixed on the movable tooth 2 by screw 4.

The movable tooth packing of ferrite adaptive temperature height, amplitude has splendid Security and sealing than large part in or start-up course big such as rotor bows such as gap bridge, equalizing pistons.

Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims (2)

1. ferrite packing, comprise ferrite labyrinth ring (1), it is characterized in that, along the circumferential direction be provided with one groove in the middle of the described ferrite labyrinth ring (1) at least, be provided with movable tooth (2) in the described groove, spring (3) is equipped with at described movable tooth (2) rear portion.

2. ferrite packing as claimed in claim 1 is characterized in that, described spring (3) is fixed on the movable tooth (2) by screw (4).

Images