CN212615549U

CN212615549U - Centrifugal compressor balance disc sealing device

Info

Publication number: CN212615549U
Application number: CN202021273165.3U
Authority: CN
Inventors: 刘云龙; 鲁悦; 李重阳
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-02-26
Anticipated expiration: 2030-07-03

Abstract

The utility model discloses a centrifugal compressor balance disc sealing device, including the main shaft, the cover is equipped with the impeller on the main shaft, and the main shaft is located the fixed balance disc that is provided with in impeller right side position, and the outside of balance disc is provided with the shell, and the position that the inboard of shell is located between balance disc and the impeller is provided with balanced cover. The spring on the piston that sets up realizes baffle jack-up that the balance disc is located the position that the movable rod passed and realizes quick pressure release and avoids appearing that the left pressure of balance disc is too high to cause the anti axial force too big impeller that leads to and balance disc to the skew of anti axial force direction leads to frictional force increase to lead to the great life-span that influences centrifugal compressor of internal part wearing and tearing, and when the impeller rotated at a high speed, make baffle and packing ring carry out the shutoff to the through-hole on the balance disc under the pressure of constantly increasing and make high-pressure gas pass through the clearance between balance disc and the balance sleeve and discharge and make the balance disc anti axial force increase realize with the equilibrium of axial force.

Description

Centrifugal compressor balance disc sealing device

Technical Field

The utility model relates to a centrifugal compressor balance disc technical field specifically is a centrifugal compressor balance disc sealing device.

Background

The balance disc is a disc of centrifugal compressor placed behind last stage impeller (high pressure end), and utilizes the axial thrust produced by pressure difference of gas on its two sides to partially offset the axial force of rotor, and its one side is used for pressing balance disc force, and is not more gas pressure (high pressure) in the gap of last stage impeller wheel disc, and its another side is usually communicated with suction chamber of machine, and its pressure is atmospheric pressure or intake pressure (low pressure), and the above-mentioned pressure difference can make the rotor receive a force opposite to axial force, and its magnitude is determined by the force-bearing area of balance disc, and the excircle of balance disc is equipped with sealing device to make the disc retain pressure difference, so that it only can balance a portion of axial force to prevent rotor from moving back and forth when it is worked, and the residual axial force is received by thrust bearing.

The applicant finds that the existing balance disc has a smaller axial force at the initial stage of rotation of the impeller, so that the counter axial force of the gas-driven balance disc flowing is larger, the impeller and the balance disc deviate to the counter axial force direction to lead to the increase of friction force, and the abrasion of the internal parts is larger, so that the service life of the centrifugal compressor is greatly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a centrifugal compressor balancing disk sealing device aims at improving the problem that current balancing disk rotates the less gas drive balancing disk that makes flow of initial stage axial force at the impeller and leads to impeller and balancing disk to the skew of anti axial force direction greatly and lead to frictional force to increase to lead to the great life-span that influences centrifugal compressor of the inside part wearing and tearing.

The utility model discloses a realize like this:

a centrifugal compressor balance disc sealing device comprises a main shaft, wherein an impeller is sleeved on the main shaft, a balance disc is fixedly arranged at the position of the main shaft, which is positioned at the right side of the impeller, a shell is arranged at the outer side of the balance disc, a balance sleeve is arranged at the position, which is positioned between the balance disc and the impeller, of the inner side of the shell, a plurality of pistons which are uniformly distributed in a circumferential shape are arranged on the balance disc, each piston comprises a movable rod, a baffle is arranged at the left end of each movable rod, a gasket is arranged on the right end face of each baffle, a spring for jacking the corresponding baffle is sleeved on each movable rod, the right end of each movable rod penetrates through the balance disc and is fixedly screwed with a nut, the baffle is jacked up by the spring on the arranged piston to realize that the balance disc is positioned at the position where the corresponding movable rod penetrates through the movable rod to realize rapid pressure relief, and the phenomenon that the service life of the centrifugal compressor is, and when the impeller rotates at a high speed, the baffle and the gasket block the through hole on the balance disc under the continuously increased pressure, so that high-pressure gas is discharged through a gap between the balance disc and the balance sleeve, the counter axial force of the balance disc is increased, and the balance with the axial force is realized.

Further, the balance disc is provided with the spring hole of installation spring, and the right-hand member in spring hole is provided with the guiding hole that leads to the movable rod, and the left end in spring hole is provided with the groove of stepping down and realizes placing the spring through the spring hole that sets up to realize leading the activity of movable rod through the guiding hole.

Furthermore, the right side of the balance disc is provided with a pressure relief cavity at the inner side of the shell, and the balance disc is provided with a pressure relief hole for communicating the spring hole with the pressure relief cavity.

Furthermore, a clamping groove is formed in the center of the left end face of the balance disc, a sealing ring is clamped on the inner side of the clamping groove, a thrust sleeve is fixedly sleeved on the right end portion of the main shaft, which is located on the balance disc, the balance disc is connected with the main shaft in a sealing mode through the arranged sealing ring, and limitation on axial force is achieved through the thrust sleeve.

Furthermore, a plurality of clamping rings which are uniformly arranged are arranged at the position, close to the edge, of the left end face of the balance disc, the cross section of each clamping ring is trapezoidal, and clamping matching between the clamping rings and the balance sleeve is achieved through the arranged clamping rings.

Furthermore, the left end of the balance sleeve is provided with a clamping table clamped on the inner side of the shell, the right end face of the balance sleeve is close to the edge and is provided with an annular groove matched with the clamping ring, and high-pressure airflow flows through the gap between the clamping ring and the annular groove through the matching of the clamping ring and the annular groove so as to avoid abrasion between the balance sleeve and the balance disc.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses in realize through the spring on the piston that sets up that the position that the balance plate was located the movable rod and passes through baffle jack-up that quick pressure release is avoided appearing the left high pressure of balance plate and is caused anti-axial force too big impeller that leads to and balance plate to lead to the frictional force increase to the skew of anti-axial force direction to lead to the great life-span that influences centrifugal compressor of internal part wearing and tearing to the impeller that leads to, and when the impeller rotated at a high speed, make baffle and packing ring carry out the shutoff to the clearance discharge that the balance plate goes up through-hole on the balance plate under the pressure of continuous increase and make high-pressure gas pass through the balance of balance plate and balance sleeve and realize the balance with axial force.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a cross-sectional view of a centrifugal compressor balance disc seal arrangement shown in the present invention;

fig. 2 is a schematic view of a balance plate of a centrifugal compressor balance plate sealing device according to the present invention;

fig. 3 is a schematic view of a balance sleeve of a centrifugal compressor balance disc sealing device according to the present invention;

fig. 4 is a schematic view of a piston structure of a sealing device for a balance disc of a centrifugal compressor according to the present invention.

In the figure: 1. an impeller; 2. a housing; 3. a balance sleeve; 31. an annular groove; 32. clamping a platform; 4. a balance disc; 41. a snap ring; 42. a yielding groove; 43. a spring hole; 44. a pressure relief vent; 45. a guide hole; 5. an exhaust hole; 6. a pressure relief cavity; 7. a main shaft; 8. a seal ring; 9. a piston: 91. a baffle plate; 92. a gasket; 93. a spring; 94. a nut; 95. A movable rod; 10. a thrust sleeve.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Embodiment 1, please refer to fig. 1 and 4 specifically, a centrifugal compressor balance disc sealing device, including a main shaft 7, a impeller 1 is sleeved on the main shaft 7, and a right side portion of the impeller 1 of the main shaft 7 is fixedly provided with a balance disc 4, an outer side of the balance disc 4 is provided with a housing 2, a portion between the balance disc 4 and the impeller 1 of an inner side of the housing 2 is provided with a balance sleeve 3, the balance disc 4 is provided with a plurality of pistons 9 uniformly arranged in a circumferential manner, the pistons 9 include movable rods 95, a baffle 91 is disposed at a left end of each movable rod 95, a gasket 92 is disposed at a right end face of each baffle 91, a spring 93 for jacking the baffle 91 is sleeved on each movable rod 95, and the movable rods 95 penetrate through the balance disc 4 and are fixedly screwed with nuts 94, the baffle 91 is jacked up by the springs 93 on the pistons 9 to achieve rapid pressure relief of the balance disc 4 at a position where the movable rods 95 penetrate, thereby achieving rapid pressure relief and avoiding occurrence of excessive axial force The impeller and the balance disk 4 are greatly deviated towards the direction of the counter axial force, the friction force is increased, the abrasion of internal parts is greatly caused, the service life of the centrifugal compressor is greatly influenced, and when the impeller rotates at high speed, the baffle plate 91 and the gasket 92 are used for plugging the through hole in the balance disk 4 under the continuously increased pressure, so that high-pressure gas is discharged through a gap between the balance disk 4 and the balance sleeve 3, and the counter axial force of the balance disk 4 is increased to realize the balance with the axial force.

Specifically, referring to fig. 2, the balance disc 4 is provided with a spring hole 43 for mounting a spring 93, a guide hole 45 for guiding the movable rod 95 is provided at the right end of the spring hole 43, a relief groove 42 is provided at the left end of the spring hole 43, the spring 93 is placed through the spring hole 43, and movable guiding of the movable rod 95 is achieved through the guide hole 45, a plurality of clamping rings 41 which are uniformly arranged are provided at positions, close to the edge, of the left end face of the balance disc 4, the cross-sectional shape of each clamping ring 41 is trapezoidal, and clamping matching between the clamping ring 41 and the balance sleeve 3 is achieved through the clamping rings 41.

Specifically, referring to fig. 1, a pressure relief cavity 6 is disposed on the right side of the balance disk 4 and located inside the housing 2, and a pressure relief hole 44 for communicating the spring hole 43 with the pressure relief cavity 6 is disposed on the balance disk 4.

Specifically, referring to fig. 1 and fig. 2, a clamping groove is formed in the center of the left end face of the balance disc 4, a sealing ring 8 is clamped inside the clamping groove, a thrust sleeve 10 is fixedly sleeved on the right end portion of the main shaft 7, which is located on the balance disc 4, the balance disc 4 is in sealing connection with the main shaft 7 through the arranged sealing ring 8, and the axial force is limited through the thrust sleeve 10.

Specifically, referring to fig. 3, a clamping table 32 clamped inside the housing 2 is disposed at the left end of the balance sleeve 3, an annular groove 31 matched with the clamping ring 41 is disposed near the edge of the right end face of the balance sleeve 3, and the high-pressure air flow flows through the gap between the clamping ring 41 and the annular groove 31 by matching the clamping ring 41 and the annular groove 31, so as to avoid abrasion between the balance sleeve 3 and the balance disk 4.

The working principle is that when the centrifugal compressor works, the axial force generated by low initial rotation speed of the impeller is small, the baffle plate 91 is jacked up by the spring 93 on the piston 9 to realize that the air pressure on the left side of the balance disk 4 is quickly decompressed by the spring hole 43 and the pressure release hole 44 on the balance disk 4, the phenomenon that the service life of the centrifugal compressor is influenced because the friction force is greatly abraded due to the fact that the impeller and the balance disk 4 are deviated in the direction of the reverse axial force because the reverse axial force is too high and the internal components are prevented from being too large due to the fact that the pressure on the left side of the balance disk 4 is too high is avoided, and when the impeller rotates at high speed, the baffle plate 91 and the gasket 92 block the spring hole 43 under continuously increased pressure to enable high-pressure air to be discharged through a gap between the balance disk 4 and the.

The device obtained by the design can basically meet the requirement that the conventional balance disc cannot be used when the axial force is small at the initial rotation stage of the impeller, so that the service life of the centrifugal compressor is greatly influenced due to the fact that the flowing gas drives the balance disc to have large reverse axial force, the impeller and the balance disc deviate in the direction of the reverse axial force, the friction force is increased, the abrasion of internal parts is large, and the service life of the centrifugal compressor is prolonged.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A centrifugal compressor balance disc sealing device, comprising a main shaft (7), characterized in that: the utility model discloses a balance disc, including main shaft (7), balancing disk (4), shell (2), balancing disk (4), movable rod (95), baffle (91) and right-hand member face of baffle (91), the cover is equipped with impeller (1) on main shaft (7), and main shaft (7) are located that impeller (1) right side position is fixed and are provided with balancing disk (4), the outside of balancing disk (4) is provided with shell (2), and the inboard position that is located between balancing disk (4) and impeller (1) of shell (2) is provided with balancing sleeve (3), be provided with piston (9) that a plurality of is the circumference form and evenly arranges on balancing disk (4), piston (9) are including movable rod (95), the left end of movable rod (95) is provided with baffle (91), and the right-hand member face of baffle (91) is provided with packing ring (92), the cover is equipped with spring (93.

2. The centrifugal compressor balance disc sealing device according to claim 1, wherein the balance disc (4) is provided with a spring hole (43) for mounting a spring (93), and a guide hole (45) for guiding the movable rod (95) is provided at a right end of the spring hole (43), and a relief groove (42) is provided at a left end of the spring hole (43).

3. The centrifugal compressor balance disc sealing device according to claim 2, wherein the right side of the balance disc (4) is provided with a pressure relief cavity (6) at the inner side of the casing (2), and the balance disc (4) is provided with a pressure relief hole (44) communicating the spring hole (43) and the pressure relief cavity (6).

4. The centrifugal compressor balance disc sealing device according to claim 3, wherein a clamping groove is arranged at the center of the left end face of the balance disc (4), a sealing ring (8) is clamped inside the clamping groove, and a thrust sleeve (10) is fixedly arranged on the main shaft (7) at the right end part of the balance disc (4).

5. The centrifugal compressor balance disc sealing device according to claim 4, characterized in that a plurality of clamping rings (41) are uniformly arranged on the left end surface of the balance disc (4) near the edge, and the cross-sectional shape of the clamping rings (41) is trapezoidal.

6. The centrifugal compressor balance disc sealing device according to claim 5, characterized in that the left end of the balance sleeve (3) is provided with a clamping table (32) clamped inside the shell (2), and the right end face of the balance sleeve (3) is provided with an annular groove (31) close to the edge for matching with the clamping ring (41).