CN218093160U

CN218093160U - Spring piece for steam seal and steam seal

Info

Publication number: CN218093160U
Application number: CN202222014459.XU
Authority: CN
Inventors: 李睿; 姚浩; 申秀兰; 李桐
Original assignee: Shandong Qilu Motor Manufacturing Co Ltd
Current assignee: Shandong Qilu Motor Manufacturing Co Ltd
Priority date: 2022-08-01
Filing date: 2022-08-01
Publication date: 2022-12-20
Anticipated expiration: 2032-08-01

Abstract

The utility model provides a spring leaf and vapor seal for vapor seal relates to the spring leaf field for the vapor seal, and the scheme of adoption is: the spring piece for the steam seal comprises a supporting body, the supporting body is in an arch shape, two ends of the supporting body are respectively provided with a fixed supporting leg and a sliding supporting leg, a clamping groove is formed in the fixed supporting leg, and the clamping groove is used for positioning the fixed supporting leg. The utility model discloses can reduce spring leaf and gland casing area of contact, reduce frictional force, strengthen the intensity of spring leaf for the gland simultaneously, difficult fracture prolongs its life.

Description

Spring piece for steam seal and steam seal

Technical Field

The utility model relates to a spring leaf field for the vapor seal especially relates to a spring leaf and vapor seal for vapor seal.

Background

When the steam turbine operates, a proper gap needs to be left between the rotating part and the static part to ensure that the dynamic part and the static part cannot generate friction, and the steam seal is equipment for ensuring that the dynamic part and the static part have proper gaps and simultaneously preventing steam from leaking from the dynamic part and the static part or air from leaking into a vacuum part of a cylinder from a shaft end; the steam seal can be divided into an end steam seal, a clapboard steam seal and a shroud steam seal according to different installation positions, and the basic structure of the steam seal mainly comprises a steam seal body, a spring piece and a steam seal ring; the flange of the steam seal ring is arranged in the corresponding groove of the steam seal body, the spring piece keeps the position of the steam seal ring, once the spring piece collides with the rotor, the steam seal ring can rebound to ensure the safe operation of the unit, the spring piece is used as an important component of the steam seal, and the structure of the spring piece has important influence on the steam seal effect and the safe operation of the whole unit; as shown in fig. 1, in the prior art, the gland sealing spring piece is a diamond spring piece, the diamond spring piece is clamped between the gland sealing ring and the gland sealing body, the diamond spring piece has a large contact area with the gland sealing body and a large friction force, so that the yielding resistance of the gland sealing ring is increased when a moving part and a static part are rubbed and ground, the diamond spring piece is in a variable cross-section shape, so that the stress is not uniform, the weight of the gland sealing ring can be supported between 90 and 125N, when the diamond spring piece is applied to a medium-sized or large-sized steam turbine, the diamond spring piece is easily broken, the yielding of the gland sealing ring is lost, on one hand, the gas leakage of the gland sealing ring is increased due to long-time rubbing and the steam sealing teeth and the rotor enter a front box and a rear box along the axial direction to emulsify oil liquid, so that the lubricating performance is reduced, and on the other hand, under the condition that an oil source is shared by the regulating system, the blockage and the corrosion are caused, so that the unit is abnormally operated.

Therefore, in view of the current situation of the prior art, it is an urgent need to develop a spring plate for a steam seal and a steam seal.

SUMMERY OF THE UTILITY MODEL

In order to overcome not enough among the above-mentioned prior art, the utility model provides a spring leaf and vapor seal for vapor seal can reduce spring leaf and vapor seal body area of contact, reduces frictional force, strengthens the intensity of spring leaf for vapor seal simultaneously, and difficult fracture prolongs its life.

The utility model discloses a solve the technical scheme that above-mentioned technical problem adopted and be: the utility model provides a spring leaf for vapor seal, spring leaf for vapor seal includes the supporter, the supporter is the arch form, the both ends of supporter are provided with fixed stay foot and sliding support foot respectively, the last draw-in groove that is provided with of fixed stay foot, the draw-in groove is used for the location fixed stay foot. The support body and the gland casing body of arch form contact through the arch form and reduce frictional force, have reduced the resistance that the gland casing fell when sound part bumps and grinds, have good performance of retreating, adopt the actual yield strength that the arch form structure still strengthened the support simultaneously, be fit for little, medium and large-scale steam turbine and use, difficult fracture.

Furthermore, the fixed supporting legs are of plate-shaped structures and are in transitional connection with the supporting body through reinforcing arcs. Can strengthen supporter and fixed stay foot joint strength, avoid stress concentration to cause the fracture.

Furthermore, the sliding supporting leg is of an arc-shaped structure, and the surface of the trough of the sliding supporting leg is used for being abutted against the steam seal ring. The contact area between the arc-shaped structure and the steam seal ring is reduced, and the yielding resistance is further reduced.

Furthermore, the supporting body, the fixed supporting legs and the sliding supporting legs are of an integrally formed structure. Is beneficial to enhancing the integral strength and preventing the fracture.

Furthermore, the spring leaf for the steam seal is made of GH136 materials. The high-elasticity high-temperature-resistant composite material has high elasticity, fatigue strength and high temperature resistance, and is suitable for a steam turbine.

Furthermore, a self-lubricating antifriction layer is arranged on the surface of the spring piece for the steam seal. The friction force can be reduced, and the yielding resistance is further reduced.

Furthermore, the widths of the fixed supporting legs, the supporting body and the sliding supporting legs are the same, the thicknesses H of the fixed supporting legs, the thickness H of the supporting body and the thickness H of the sliding supporting legs are the same, and H is larger than or equal to 1.8mm and smaller than or equal to 5.7mm. By adopting the uniform cross-section structure, the phenomenon that the stress is uneven and the stress is easy to break can be avoided.

The utility model also provides a vapor seal, including gland sealing ring and gland sealing body, still include foretell spring leaf for the vapor seal, be provided with the flange on gland sealing ring's the periphery, be provided with the recess on gland sealing body's the interior disc, the flange can the joint be in the recess, fixed stay foot with the sliding support foot all sets up on the flange, be provided with the locating part on the flange, the locating part can the joint be in the draw-in groove, the sliding support foot can be followed the flange slides, the top of supporter with gland sealing body butt. This spring leaf is conveniently installed through using locating part and draw-in groove to realize better limiting displacement.

Further, the groove width of the groove is L1, the widths of the fixed supporting feet and the sliding supporting feet are both L2, and 1.5mm and L1-L2 are less than 2mm. Avoid this spring leaf installation clearance undersize to lead to the spring leaf to block puckery problem in the mounting groove through restriction recess size, prevent again that the clearance from too big this spring leaf from removing about in the recess, lead to the gland sealing circle can not realize evenly letting back.

Further, be provided with the mounting groove on the flange, mounting groove one end is provided with the locating part, fixed supporting legs with the sliding support leg all sets up in the mounting groove, the sliding support leg can be followed the tank bottom of mounting groove slides, the groove width of mounting groove is L3, fixed supporting legs with the width of sliding support leg is L2,1.5mm is restricted L3-L2<2mm. The installation and use flexibility of the spring piece is improved by arranging the installation groove, the gap can be ensured to be in a proper range under the condition that the groove is wide, and the phenomenon of jamming or left-right movement is avoided.

According to the technical scheme, the utility model has the advantages of it is following:

the spring piece for the steam seal and the steam seal are provided, the contact between the arched support body and the steam seal body reduces the friction force, the resistance of the steam seal ring in the collision and grinding of a moving part and a static part is reduced, the steam seal has good yielding performance, the actual yield strength of the support is enhanced by adopting the arched structure, and the spring piece for the steam seal is suitable for small, medium and large steam turbines and is not easy to break; the connection strength of the support body and the fixed supporting leg can be enhanced by adopting reinforced arc transition, and the fracture caused by stress concentration is avoided; the friction force with a steam seal ring can be reduced by arranging the self-lubricating antifriction and the movable supporting leg with the arc-shaped structure, so that the yielding resistance is further reduced; the uniform cross-section structure can avoid uneven stress and easy breakage; the spring piece can be conveniently installed and fixed through the matching of the limiting piece and the clamping groove; can avoid the clearance undersize to lead to the spring leaf to block puckery problem in the mounting groove through setting up the relation between L1 and the L2, prevent again that the too big spring leaf in clearance from removing about in the mounting groove, lead to the vapor seal circle can not realize evenly letting back.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the description will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a diamond-shaped spring plate.

Fig. 2 is a first schematic structural view of a spring leaf for a vapor seal according to a first embodiment of the present invention.

Fig. 3 is a schematic structural view of a spring plate for a steam seal according to a first embodiment of the present invention.

Fig. 4 is a first schematic view of a vapor seal structure according to a first embodiment of the present invention.

Fig. 5 is a schematic view of a steam seal structure according to a first embodiment of the present invention.

Fig. 6 is a schematic view of a steam seal structure according to a second embodiment of the present invention.

In the figure, the steam seal comprises a fixed supporting leg 1, a supporting body 2, a supporting body 3, a sliding supporting leg 4, a clamping groove 5, a steam seal body 6, a diamond-shaped spring piece 7, a flange 8, an installation groove 9, a steam seal ring 10, a limiting piece 11 and a groove.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.

Detailed description of the invention

As shown in fig. 2 to fig. 3, the present embodiment provides a leaf spring for a steam seal, which includes a support body 2, a fixed supporting leg 1 and a sliding supporting leg 3; the support body 2 is arch-shaped, the two ends of the support body 2 are respectively provided with the fixed supporting leg 1 and the sliding supporting leg 3, the support body 2, the fixed supporting leg 1 and the sliding supporting leg 3 are integrally formed, the structural strength is higher, the support body 2 adopts an arch-shaped structure, compared with a diamond-shaped structure, on one hand, the contact area between the support body 2 and the steam seal body 5 is reduced, the friction is reduced, and the deformability is ensured, on the other hand, the yield strength of the support body 2 with the arch-shaped structure is high, the support body can bear higher pressure, the service life is longer, and the deformation and the fracture are avoided; the fixed supporting leg 1 is of a plate-shaped structure, the fixed supporting leg 1 is in transitional connection with the supporting body 2 through a reinforcing arc, the reinforcing arc can avoid stress concentration, and fracture of a joint is prevented, a clamping groove 4 is formed in the fixed supporting leg 1, the clamping groove 4 is used for positioning the fixed supporting leg 1, the clamping groove 4 comprises an inlet end and a clamping end, and the width of the inlet end is smaller than the diameter of the clamping end; the sliding supporting legs 3 are of arc-shaped structures, the surfaces of the wave troughs of the sliding supporting legs 3 are used for being abutted against the steam seal ring 9, so that the friction force generated between the spring piece and the steam seal ring 9 when the spring piece is deformed is further reduced, and better deformability is ensured; the supporting body 2, the fixed supporting leg 1 and the sliding supporting leg 3 are made of GH136 materials, self-lubricating antifriction layers are arranged on the surfaces of the supporting body 2, the fixed supporting leg 1 and the sliding supporting leg 3, and the self-lubricating antifriction layers are made of porous self-lubricating powder metallurgy antifriction materials, so that the self-lubricating antifriction layers have good antifriction performance, the friction force between the spring piece and a contact position is reduced, and better deformability is further ensured; the widths of the fixed supporting leg 1, the supporting body 2 and the sliding supporting leg 3 are the same, the thicknesses H of the fixed supporting leg 1, the supporting body 2 and the sliding supporting leg 3 are the same, H is larger than or equal to 1.8mm and smaller than or equal to 5.7mm, the spring is of a uniform cross-section structure, and the spring can be guaranteed to be stressed uniformly and not prone to deformation and fracture.

As shown in fig. 4 and 5, the present embodiment further provides a steam seal, which includes a steam seal ring 9, a steam seal body 5, and the spring leaf for steam seal, where the steam seal ring 9 is provided with a flange 7, the cross section of the flange 7 is in an inverted convex shape, the inner circular surface of the steam seal body 5 is provided with a groove 11, the cross section of the groove 11 is in an inverted convex shape, the flange 7 can be clamped in the groove 11, the flange 7 is provided with a limiting member 10, in the present embodiment, the limiting member 10 is a screw, the fixed support leg 1 and the sliding support leg 3 are both arranged on the flange 7, the limiting member 10 is clamped in the clamping groove 4 to limit the fixed support leg 1, and the top of the support body 2 is abutted to the steam seal body 5; the groove width of the groove 11 is L1, the widths of the fixed supporting leg 1 and the sliding supporting leg 3 are L2,1.5mm is used for L1-L2<2mm, the problem that the spring piece is jammed in the groove 11 due to too small clearance is avoided, and the phenomenon that the spring piece moves left and right in the groove 11 due to too large clearance is avoided, so that the steam seal ring 9 cannot realize uniform concession.

Detailed description of the invention

As shown in fig. 6, the present embodiment provides a steam seal, which is basically the same as the steam seal in the first embodiment, except that: a mounting groove 8 is formed in the circumferential surface of the flange 7, a limiting piece 10 which is also a screw is arranged at one end of the mounting groove 8, the fixed supporting leg 1 and the sliding supporting leg 3 are both arranged in the mounting groove 8, and the limiting piece 10 can be clamped in the clamping groove 4; the groove width of the installation groove 8 is L3,1.5mm & lt L3-L2 & lt 2mm; when the difference between the width of the groove 11 and the width of the spring piece exceeds 2mm, the mounting groove 8 is formed in the flange 7 through arrangement, so that the difference between the width of the mounting groove 8 and the width of the spring piece meets the requirement, and the application range of the spring piece is enlarged.

It can be seen from the above detailed description that the present invention has the following advantages:

1. the contact between the arch support body 2 and the gland seal body 5 reduces the friction force, reduces the resistance of the steam seal ring 9 during the collision and grinding of moving and static parts, has good yielding performance, simultaneously enhances the actual yield strength of the support by adopting the arch structure, is suitable for small, medium and large turbines, and is not easy to break;

2. the connection strength of the support body 2 and the fixed supporting leg 1 can be enhanced by adopting reinforced arc transition, and the fracture caused by stress concentration is avoided; the friction force with the steam seal ring 9 can be reduced by arranging the self-lubricating antifriction and the movable supporting leg with the arc-shaped structure, so that the yielding resistance is further reduced;

3. by adopting the uniform-section structure, the problem that the steel pipe is uneven in stress and easy to break can be avoided; the spring piece can be conveniently installed and fixed through the matching of the limiting piece 10 and the clamping groove 4;

4. the problem that the spring piece is jammed in the groove 11 due to the fact that the gap is too small can be avoided by setting the relation between the L1 and the L2, and the phenomenon that the spring piece with too large gap moves left and right in the groove 11 to cause that the steam seal ring 9 cannot realize uniform concession is also prevented;

5. the mounting groove 8 is formed in the flange 7, so that the gap between the spring piece and the two side parts after mounting can be controlled, and the application range of the spring piece is widened.

The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings (if any) are used to distinguish relative relationships in position, and are not necessarily qualitative. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The spring piece for the steam seal is characterized by comprising a supporting body (2), wherein the supporting body (2) is of an arch shape, two ends of the supporting body (2) are respectively provided with a fixed supporting leg (1) and a sliding supporting leg (3), a clamping groove (4) is formed in the fixed supporting leg (1), and the clamping groove (4) is used for positioning the fixed supporting leg (1).

2. The leaf spring for steam seal according to claim 1, characterized in that the fixed supporting foot (1) is a plate-shaped structure, and the fixed supporting foot (1) and the supporting body (2) are transitionally connected through a reinforcing arc.

3. The leaf spring for steam seal according to claim 2, characterized in that the sliding support leg (3) is of an arc-shaped structure, and the surface of the trough of the sliding support leg (3) is used for abutting against the steam seal ring (9).

4. The leaf spring for a gland seal according to claim 1, characterized in that the support body (2), the fixed support leg (1) and the sliding support leg (3) are of an integrally formed structure.

5. The gland leaf spring of claim 4, wherein GH136 material is used.

6. The gland leaf spring according to claim 5, wherein a self-lubricating antifriction layer is provided on a surface of the gland leaf spring.

7. The spring leaf for steam seal according to claim 1, characterized in that the fixed supporting leg (1), the supporting body (2) and the sliding supporting leg (3) have the same width, the thickness H of the fixed supporting leg (1), the supporting body (2) and the sliding supporting leg (3) are the same, H is more than or equal to 1.8mm and less than or equal to 5.7mm.

8. A steam seal, comprising a steam seal ring (9) and a steam seal body (5), and characterized by further comprising the spring piece for steam seal according to any one of claims 1 to 7, wherein a flange (7) is arranged on the circumferential surface of the steam seal ring (9), a groove (11) is arranged on the inner circumferential surface of the steam seal body (5), the flange (7) can be clamped in the groove (11), the fixed supporting leg (1) and the sliding supporting leg (3) are both arranged on the flange (7), the flange (7) is provided with a limiting piece (10), the limiting piece (10) can be clamped in the clamping groove (4), the sliding supporting leg (3) can slide along the flange (7), and the top of the supporting body (2) is abutted against the steam seal body (5).

9. Gland seal according to claim 8, characterized in that the groove (11) has a groove width of L1, and that the fixed support feet (1) and the sliding support feet (3) are each of a width of L2,1.5mm and are woven together with L1-L2<2mm.

10. The gland seal according to claim 8, characterized in that a mounting groove (8) is provided on said flange (7), said limiting member (10) is provided at one end of said mounting groove (8), said fixed support legs (1) and said sliding support legs (3) are both provided in said mounting groove (8), said sliding support legs (3) are slidable along the bottom of said mounting groove (8), the width of said mounting groove (8) is L3, and the widths of said fixed support legs (1) and said sliding support legs (3) are both L2,1.5mm and L3-L2<2mm.