CN101907171A

CN101907171A - Labyrinth seal

Info

Publication number: CN101907171A
Application number: CN2009100118055A
Authority: CN
Inventors: 刘美琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-02
Filing date: 2009-06-02
Publication date: 2010-12-08

Abstract

The invention discloses a labyrinth seal which comprises a seal ring (2). A cavity of the seal ring (2) is axially provided with annular support discs (1) at intervals, an inner ring of each support disc (1) is connected with a support cylinder (3) with larger axial width than the support disc (1), and both ends of the support cylinder (3) are respectively and axially provided with a high folded tooth and a low folded tooth. The traditional independent high-low tooth form is changed into the structure formed by connecting one group of support disc and support cylinder, so that the space inside the seal is enlarged, and the complexity of the space is increased. The end parts of the folded teeth form a zigzag shape naturally, so that airflow inside the space is dispersed, the directional flow is reduced, and the labyrinth effect is magnified. Meanwhile, the bottom of a tooth cavity comprises numerous saw teeth, so that the roughness of the inner part is increased, and the energy conversion is enhanced. Thus, the invention has the advantages of simple structure, good sealing effect and the like.

Description

A kind of labyrinth gland

Technical field

The present invention relates to a kind of packing, more particularly, relate to the structural design of packing labyrinth chamber.

Background technique

Packing is suitable for being installed in usually on the rotatingshaft on the equipment such as steam turbine, is used for rotating shaft end packing or blade tip seal.Disclose a kind of labyrinth gland as Chinese patent " labyrinth gland of node type side tooth " (patent No. 03211345.5), comprised between casing and rotatingshaft and by the seal ring of spring positioning, the straight-tooth side outstanding at seal ring is provided with the side tooth.At present, the resistance that the labyrinth seal structure of prior art produces when utilizing fluid to pass through the labyrinth makes the fluid self kinetic energy consume gradually, and flow reduces thereupon, finally realizes sealing state.But in actual applications because the restriction of many conditions for example, situations such as vibrations occur in the rotatingshaft operation process, cause that the gap becomes greatly between labyrinth teeth and the axis body, influence sealing effect; Perhaps because of structural limitations, labyrinth effect deficiency influences packing effect etc.

Summary of the invention

The present invention is directed to the problems referred to above, provide a kind of labyrinth effect strong, can effectively realize the packing that gas is airtight.

In order to address the above problem, the present invention has designed a kind of labyrinth gland, comprises seal ring, and the seal ring inner chamber is provided with the ring-type supporting disk vertically at interval.Ring is connected with at the supporting drum of axial width greater than supporting disk in each supporting disk, and the supporting drum two ends are disposed radially one high and one low folded tooth respectively.High-order folded tooth is corresponding to the step place on the rotor outer cylinder, and the folded tooth of low level is corresponding to the groove on the rotor outer cylinder.Under the optimal way, the step place and the groove of same supporting drum two ends folded tooth correspondence are neighbouring relations.

In addition, under the optimum way, it is step-like that the end of each folded tooth becomes.

Packing for convenience of the present invention is installed, and the seal ring external cylindrical surface is provided with collar flange, and the outer central spacer of flange is connected with the circular arc sleeve of axial width greater than flange.And in order to increase the labyrinth effect, under the optimal way, the inner chamber cylinder of seal ring becomes irregular flexuose.

The present invention becomes the high and low tooth absolute version of tradition into the structure that is connected with supporting drum by a supporting disk, supporting disk and supporting drum are merged into a supporting component with the root of adjacent folded tooth, reach and close the root purpose, rely on coarse, baroque sawtooth chamber simultaneously, increase the labyrinth effect, thereby strengthened the packing volume inside, and the complexity in space.And the folded tooth end forms tortuous shape naturally, upsets the internal gas flow direction, has reduced directional flow, further amplifies the labyrinth effect.Tooth cavity simultaneously of the present invention bottom is made of countless sawtooth, strengthens inner roughness, thereby strengthens transformation of energy.Specifically, compared with prior art, the present invention has following beneficial effect:

1, adjacent high and low folded tooth is connected as a single entity by supporting disk at root, has strengthened the inner space, and the complexity in space, thereby makes the Conversion of energy space become big.

2, the folded tooth of seal ring formation labyrinth shape makes the random string of internal gas flow moving.

3, seal ring inwall engrail has increased inner roughness, thereby helps to add large space, and therefore upsets stream condition.

4, adopt the adjustment of more advanced arc end, hommization more is installed, be convenient to accurate location.

5, the present invention keeps the good characteristic of traditional packing, and particularly outstanding is, its profile is compared with the like product of prior art, does not do too many variation, even size also remains unchanged, thereby packing of the present invention possesses the basis of extensive use.

6, arc end adjustment, back of the body arc adjustable structure make the present invention more humane, can adjust to be in the gland blocks two ends, reach the most Utopian state of adjusting, and therefore guarantee that practical operation is more accurate, more practical.

Description of drawings

Fig. 1 is the cross-sectional view under the packing user mode of the present invention, has omitted the symmetric part of Lower Half among the figure;

Fig. 2 is the left view under the packing user mode shown in Figure 1;

Fig. 3 is the local enlarged diagram of packing sixth structure end face under the prior art;

Fig. 4 is the local enlarged diagram of packing sixth structure end face of the present invention;

Fig. 5 is the user mode figure of packing of the present invention, demonstrates the coupled condition of packing and external fixed structure among the figure.

Embodiment

As shown in Figure 1, labyrinth gland of the present invention comprises seal ring 2.The inner chamber of seal ring 2 is provided with ring-type supporting disk 1 vertically at interval; Ring is connected with the supporting drum 3 of axial width greater than supporting disk 1 in each supporting disk 1, and supporting drum 3 axial width two ends are disposed radially one high and one low folded tooth 21 respectively.Thereby sawtooth chamber 5 forms convex structure or step-like structure, has strengthened the inner space, and the complexity in space, has strengthened Conversion of energy.

The position that each group supporting disk 1, supporting drum 3 and high and low folded tooth 21 are provided with is by the step and the groove decision of rotor 6 outer cylinders.High-order folded tooth is corresponding to the step place on the rotor outer cylinder, and the folded tooth of low level is corresponding to the groove on the rotor outer cylinder.Under the optimal way, the step place and the groove of same supporting drum two ends folded tooth correspondence are neighbouring relations.

In addition, be provided with that the group of supporting disk 1, supporting drum 3 and folded tooth 21 is several decides according to seal request.Can be one group, adopt the both sides interval mode; Also can adopt as shown in Figure 1 two groups, even more groups of spacing structures are arranged and also can.

In order further to strengthen the labyrinth effect, the end of each folded tooth 21 is arranged to step-like.And also be arranged to folded tooth shape structure under retaining tooth 31 optimal ways at seal ring 2 axial two ends.And seal ring 2 inner chamber cylinders become irregular laciniation (shown in figure 1 label 4).Fig. 1 also expresses the circulating direction of steam, in the concrete reference drawing shown in the arrow, steam enters in first step-like sawtooth chamber from the left side, and then the slit from high and low folded tooth internal diameter enters " protruding " shape sawtooth chamber that is positioned at the middle part, enters the sawtooth chamber on right side at last.Because the inner space is strengthened, and spatial complex, has strengthened Conversion of energy, makes that the packing effect is more remarkable.

As shown in Figure 2, labyrinth gland of the present invention is spliced into round shell-like packing by six groups of curved portions.As Fig. 1, seal ring 2 external cylindrical surfaces are provided with collar flange 22, and the outer central spacer of flange 22 is connected with the circular arc sleeve 23 of axial width greater than flange 22.In order to strengthen adjustability of structure, the present invention changes conventional construction (as Fig. 3) form, selects structure shown in Figure 4 for use.Be used to the position of adjusting piece is set, i.e. arc end adjustment place 7 is positioned at the both sides (shown in Fig. 2 and 4) of each part-structure, thereby is convenient to integral installation and adjustment.And after combination, radially, adopt locking key to fix each curved portion (position of locking key is set) shown in Fig. 2 label 8 in splicing place.

Packing of the present invention is specifically adjusted mode as shown in Figure 5, because the axial width of circular arc sleeve 23 greater than flange 22, designs the structure of outside gland sleeve 11, becomes the clamping form.Circular arc sleeve 23 is socketed in the draw-in groove of outside gland sleeve 11.In order to guarantee that each curved portion of packing leans together, in the outside of circular arc sleeve 23, and spring or elastomer 10 are set between the inwall of gland sleeve 11, under pressure, therefore each curved portion of packing is stressed to the rotor axis direction, and to recline be a cylindric packing.In addition,, utilize the wedging position of circular arc sleeve 23 and gland sleeve 11, reserve gap adjustment place 12 in order to adjust folded tooth and gap between rotor in the packing.During practical application, cushion block is set, utilizes the thickness of cushion block to adjust inner radius folded tooth and gap between rotor in gap adjustment place 12.

The structure of tradition adjustment place as shown in Figure 3, inwardly adopt adjust, to the mode that moves in the other direction, can not guarantee to adjust accurately.And the present invention adopts the arc end to adjust mode, the adjustable more apparent hommization of back of the body arc; And can adjustment place be positioned at the two ends of packing constituent element, reach the most Utopian adjustable state, guarantee that practical operation is more accurate, more practical.

The above; only be the preferable embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technological scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.

Claims

1. a labyrinth gland comprises seal ring (2), it is characterized in that, described seal ring (2) inner chamber is provided with ring-type supporting disk (1) vertically at interval; Ring is connected with the supporting drum (3) of axial width greater than described supporting disk (1) in each described supporting disk (1), and described supporting drum (3) two ends are disposed radially one high and one low folded tooth (21) respectively.

2. labyrinth gland according to claim 1 is characterized in that, the end of each described folded tooth (21) is arranged to step-like.

3. labyrinth gland according to claim 2 is characterized in that, described seal ring (2) external cylindrical surface is provided with collar flange (22), and the outer central spacer of described flange (22) is connected with the circular arc sleeve (23) of axial width greater than described flange (22).

4. according to the arbitrary described labyrinth gland of claim 1-3, it is characterized in that described seal ring (2) inner chamber cylinder becomes irregular laciniation.