CN110821735A

CN110821735A - Novel hydraulic turbine mechanical sealing device

Info

Publication number: CN110821735A
Application number: CN201911064119.4A
Authority: CN
Inventors: 赵立盛; 赵日鑫; 李长林; 李冰
Original assignee: DALIAN SONGLONE PUMP Manufacturing Co Ltd
Current assignee: DALIAN SONGLONE PUMP Manufacturing Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-02-21

Abstract

The invention provides a novel hydraulic turbine mechanical sealing device, wherein one end of a sealing assembly is clamped on a shaft sleeve, and the other end of the sealing assembly is connected in a gland through an elastic component. The invention only uses a pair of sealing rings to form the liquid sealing cavity, thereby greatly shortening the axial installation size, having good rigidity, higher elastic modulus and smaller deformation under high temperature and high pressure, and meeting the working condition requirements of high temperature and high pressure. Meanwhile, under the condition of higher structural rigidity, the rotating ring is flexibly installed, and better fitting of the sealing surface is guaranteed. Meanwhile, the structure has good corrosion resistance, high sealing reliability and simple structure.

Description

Novel hydraulic turbine mechanical sealing device

Technical Field

The invention belongs to the field of hydraulic turbomachinery, and particularly relates to a novel sealing device for a hydraulic turbomachinery.

Background

A hydraulic turbine is a mechanical device that converts pressure energy in a liquid fluid working medium into mechanical energy, and is also called a turbine. The hydraulic turbine can be used for recycling the residual pressure of liquid in the process flow and converting the residual pressure of the liquid into mechanical energy to drive mechanical equipment, so that the aim of saving energy is fulfilled. In practical application, a reverse rotation centrifugal pump is often used as a hydraulic turbine, so that the method is more economical. In petrochemical enterprises such as oil refineries, hydraulic turbines can be used for recovering energy as long as a process with high pressure difference and certain flow exists, such as: the high-pressure pipeline returns to the side line of the low-pressure storage tank, and a hydraulic turbine can be arranged to recover energy. The inlet pressure of the turbine can reach 10MPa, the outlet pressure is 2-5 MPa, the differential pressure is 5-8 MPa, and the temperature is generally 200-300 ℃. At present, the mechanical seal for the turbine generally has the phenomena of deformation, coking, poor lubrication state of a seal end face and the like of a seal ring under high temperature and high pressure, so that the service life of the mechanical seal is short.

The prior art as patent application No. 201420004588.3 discloses a common form of axial double seal but the mechanical seal is axially long.

Disclosure of Invention

The invention aims to provide a novel hydraulic turbine mechanical sealing device which is resistant to high temperature and high pressure, simple in structure and short in mechanical sealing axial distance.

The technical scheme adopted by the invention is as follows: a novel hydraulic turbine mechanical sealing device is characterized in that one end of a sealing assembly is clamped on a shaft sleeve, and the other end of the sealing assembly is connected into a gland through an elastic component.

Further optimize, seal assembly is for adorning the rotatory ring of card on the axle sleeve and the compensating ring that contacts with rotatory ring.

Further optimized, the compensation ring is formed by inlaying a hard alloy ring on the metal piece.

Further optimize, install elastomeric element between the inner that rotatory ring leaned on the axle sleeve and the axle sleeve, the outer end is installed the card through the snap ring and is put on the axle sleeve.

Further optimize, rotatory ring is carborundum material, rotatory ring is seted up the opening and is faced the tangential groove of axle sleeve one side.

Further optimize, the contact position of the inner and outer sides of the metal piece and the gland is provided with an elastic component, and the inner end of the metal piece close to the gland is provided with a spring.

Further optimizing, one side of the contact surface of the hard alloy ring and the rotating ring is provided with a groove, the hard alloy ring is in contact with the rotating ring through the inner ring surface and the outer ring surface, and a liquid sealing cavity is formed in the middle groove.

Further optimizing, the carbide ring with seted up the round hole on the metalwork, thereby the drainage tube inserts from sealing the liquid entry and leads the root of sealing liquid drainage to metalwork and make sealing liquid get into the sealing liquid intracavity on the carbide ring, then flows out through sealing the liquid export, the circulation heat dissipation.

Further preferably, the elastic part is an O-shaped ring.

The invention has the advantages that the liquid sealing cavity is formed by only one pair of sealing rings, the axial installation size is greatly shortened, the sealing rings have good rigidity, higher elastic modulus and smaller deformation under high temperature and high pressure, and the working condition requirements of high temperature and high pressure are met. Meanwhile, under the condition of higher structural rigidity, the rotating ring is flexibly installed, and better fitting of the sealing surface is guaranteed. Meanwhile, the structure has good corrosion resistance, high sealing reliability and simple structure.

Drawings

FIG. 1 is a schematic view of a novel hydraulic turbomachinery seal assembly.

FIG. 2 is a schematic view of the rotating ring of the new hydraulic turbomachinery seal.

Reference numerals: 1-shaft sleeve; 2-O-rings; 3-O-shaped rings; 4-a sealing assembly; 41-a rotating ring; 411-tangential slots; 42-a compensation ring; 421-cemented carbide ring; 422-metal parts; 5-a snap ring; 6-sealing the liquid cavity; 7-O-shaped rings; 8-O-shaped rings; 9-pressing a cover; 10-a spring; 11-a drainage tube; 12-O-ring; 13-a circular hole; 14-inner ring surface; 15-outer annular surface; 16-sealing liquid inlet; 17-sealing liquid outlet.

Detailed Description

The invention is further explained below with reference to the drawings.

Referring to fig. 1, one end of the sealing assembly 4 is clamped on the shaft sleeve 1, and the other end of the sealing assembly 4 is connected in the gland 9 through an O-ring 7 and an O-ring 8. The sealing assembly 4 is a rotating ring 41 clamped on the shaft sleeve 1 and a compensating ring 42 butted with the rotating ring 41.

O-

shaped rings

2 and 3 are arranged between the inner end of the rotating ring 41 close to the shaft sleeve 1 and the shaft sleeve, the outer end of the rotating ring is clamped on the shaft sleeve 1 through a clamping ring 5, and the rotating ring 41 can obtain axial, radial and angle degrees of freedom in the flexible installation mode. As shown in fig. 2, the rotating ring 41 is opened with a tangential slot 411 opened toward the side of the shaft sleeve 1, so as to provide a cooling medium to the back of the rotating ring 41. If there is not the drainage of tangential groove 411, rotatory ring 41 back is the air, and its convection heat transfer coefficient is less, is equivalent to the adiabatic condition, is unfavorable for rotatory ring 41 heat dissipation, and behind the processing tangential groove 411, rotatory ring 41 back has coolant, can increase the convection heat transfer coefficient, is favorable to the sealing ring heat dissipation.

The compensating ring 42 is formed by inlaying the hard alloy ring 421 on the metal piece 422, the contact positions of the inner side and the outer side of the metal piece 422 and the gland 9 are provided with the O-

shaped rings

7 and 8, because the pressure and the temperature of the turbine device are higher, and the existing mechanical seal generally has the deformation condition of the sealing ring under high temperature and high pressure, therefore, the elastic modulus of the sealing ring is increased, the deformation of the sealing ring is reduced, the rotating ring 41 adopts a silicon carbide material, and the compensating ring 42 adopts a metal inlaying hard alloy structure. Because cemented carbide and silicon carbide materials are relatively hard, hard-to-hard rigid contact may result in a failure to provide a better fit of the seal end faces (i.e., the contact surfaces of the cemented carbide ring 421 and the rotating ring 41, i.e., the inner annular surface 14 and the outer annular surface 15 in fig. 1) due to tolerance stack-up, etc. Therefore, the O-

rings

2 and 3 are adopted on the back of the rotating ring 41, and the rubber ring is used as an elastic body, so that the rotating ring 41 can obtain axial, radial and angular degrees of freedom, better joint of sealing end surfaces is ensured, and sealing performance is improved. Meanwhile, the hard alloy ring 421 and the metal piece 422 are embedded and assembled to form the compensation ring 42 by adopting a whole-ring manufacturing process, the hard alloy ring 421 and the metal piece 422 can be integrally ground, the machining error of the compensation ring 42 is reduced, and the sealing performance is also improved.

As shown in fig. 1, two rows of springs 10 are installed at the inner end of the metal piece 422 close to the gland 9, the springs 10 are arranged by staggering a plurality of small springs, and can better provide spring force compensation for the compensation ring 42, so that the contact surface of the hard alloy ring 421 and the rotating ring 41 is always kept in a fit state, the specific pressure of the springs is also conveniently adjusted elastically, and the heat productivity of the inner ring surface 14 and the outer ring surface 15 is reduced on the premise of ensuring the sealing performance.

The contact surface side of the cemented carbide ring 421 and the rotating ring 41 is grooved, and the inner ring surface 14 and the outer ring surface 15 contact the rotating ring 41, and the middle grooved position forms the liquid seal chamber 6. The hard alloy ring 421 and the metal piece 422 are provided with the circular holes 13, the drainage tube 11 is inserted from the liquid sealing inlet 16 to lead the sealing liquid to the root of the metal piece 422, so that the sealing liquid enters the liquid sealing cavity 6 on the hard alloy ring 411 and then flows out through the liquid sealing outlet 17, the heat transmitted from the inner ring surface 14 and the outer ring surface 15 to the compensation ring 41 can be better taken away, the temperature of the sealing assembly 4 is reduced, and the heat is dissipated circularly.

In the case of meeting the temperature requirements, the O-ring for the auxiliary seal may be replaced by an elastic annular member such as a wedge ring, a star ring, or the like.

Claims

1. A novel hydraulic turbine mechanical sealing device is characterized in that: one end of the sealing component (4) is clamped on the shaft sleeve (1), and the other end of the sealing component (4) is connected in the gland (9) through an elastic component.

2. The new hydraulic turbomachinery seal of claim 1, wherein: the sealing assembly (4) is a rotating ring (41) clamped on the shaft sleeve (1) and a compensating ring (42) contacted with the rotating ring (41).

3. The new hydraulic turbomachinery seal of claim 2, wherein: the compensating ring (42) is formed by inlaying a hard alloy ring (421) on a metal piece (422).

4. The new hydraulic turbomachinery seal of claim 2, wherein: an elastic component is arranged between the inner end of the rotating ring (41) close to the shaft sleeve (1) and the shaft sleeve (1), and the outer end of the rotating ring is clamped on the shaft sleeve (1) through a clamping ring (5).

5. The new hydraulic turbomachinery seal of claim 2, wherein: the rotating ring (41) is made of silicon carbide materials, and the rotating ring (41) is provided with a tangential groove (411) with an opening facing one side of the shaft sleeve (1).

6. The new hydraulic turbomachinery seal of claim 3, wherein: elastic components are installed at the contact positions of the inner side and the outer side of the metal piece (422) and the gland (9), and springs (10) are installed at the inner ends, close to the gland (9), of the metal piece (422).

7. The new hydraulic turbomachinery seal of claim 3, wherein: one side of the contact surface of the hard alloy ring (421) and the rotating ring (41) is provided with a groove, the hard alloy ring is in contact with the rotating ring (41) through an inner ring surface (14) and an outer ring surface (15), and a liquid sealing cavity (6) is formed in the middle groove.

8. The new hydraulic turbomachinery seal of claim 7, wherein: the hard alloy ring (421) and the metal piece (422) are provided with round holes (13), the drainage tube (11) is inserted from the sealing liquid inlet (16) to guide the sealing liquid to the root of the metal piece (422), so that the sealing liquid enters the sealing liquid cavity (6) on the hard alloy ring (421), and then flows out through the sealing liquid outlet (17) to realize circulating heat dissipation.

9. The new hydraulic turbomachinery seal device as recited in any one of claims 1 to 8, wherein: the elastic component is an O-shaped ring.