CN212131060U

CN212131060U - Single screw compressor star wheel axle flexible bearing seat

Info

Publication number: CN212131060U
Application number: CN202020766305.4U
Authority: CN
Inventors: 原和平; 乔猛; 周中华; 陈贞毅
Original assignee: Haomi Power Equipment Co ltd
Current assignee: Haomi Power Equipment Co ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-12-11
Anticipated expiration: 2030-05-11

Abstract

The utility model discloses a single screw compressor star wheel shaft flexible bearing seat, which comprises a star wheel shaft, wherein a star wheel frame is arranged at the middle position of the star wheel shaft, and a fixed end and a sliding end are respectively arranged at the two ends of the star wheel shaft; the fixed end comprises a fixed end bearing connected with the star wheel shaft in a key mode, a fixed end flexible ring is sleeved outside the fixed end bearing, and a fixed end bearing seat is sleeved on the outer side of the fixed end flexible ring; the sliding end comprises a sliding end bearing connected with the star wheel shaft in a key mode, a sliding end flexible ring is sleeved outside the sliding end bearing, and a sliding end bearing seat is sleeved on the outer side of the sliding end flexible ring. The utility model discloses a design flexible ring between bearing and bearing frame, cut off the transmission of vibrating force, alleviateed the vibration that gaseous power causes greatly, improved bearing live time, and then prolonged the compressor life-span.

Description

Single screw compressor star wheel axle flexible bearing seat

Technical Field

The utility model relates to a compressor star wheel axle technical field especially relates to a single screw compressor star wheel axle flexible bearing seat.

Background

The single screw compressor is internally provided with a screw, the screw is provided with a tooth groove, a star wheel frame is provided with a star wheel sheet, the star wheel sheet is positioned in the tooth groove, the shell, the star wheel sheet and the screw groove form a closed space, the screw drives the star wheel component to rotate in the rotating process, the star wheel sheet on the star wheel frame can extrude gas, and the gas can be discharged out of the shell exhaust cavity after reaching the exhaust pressure. The gas force acts on the star wheel and is transmitted to the star wheel shaft, the star wheel of the single-screw compressor is subjected to the alternating action of the gas force to cause the star wheel shaft to vibrate, the service life of the bearing is shortened if the star wheel is light, and the shaft breakage accident of the star wheel shaft is caused if the star wheel is heavy. The traditional installation mode is that a star wheel shaft, a bearing and a bearing seat are rigidly assembled, and the vibration caused by gas force is directly transmitted to a shell of the compressor to cause the vibration of the whole compressor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a single screw compressor star wheel axle flexible bearing seat solves the big problem that influences the life-span of compressor star wheel axle vibration.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model relates to a single screw compressor star wheel axle flexible bearing seat, including the star wheel axle, be provided with the star wheel frame on the intermediate position of star wheel axle, the both ends of star wheel axle are provided with stiff end and sliding end respectively; the fixed end comprises a fixed end bearing connected with the star wheel shaft in a key mode, a fixed end flexible ring is sleeved outside the fixed end bearing, and a fixed end bearing seat is sleeved on the outer side of the fixed end flexible ring; the sliding end comprises a sliding end bearing connected with the star wheel shaft in a key mode, a sliding end flexible ring is sleeved outside the sliding end bearing, and a sliding end bearing seat is sleeved on the outer side of the sliding end flexible ring.

Further, the fixed end flexible ring and the fixed end bearing are in interference fit.

Further, the lower extreme of stiff end flexible ring is provided with the stiff end cover, the stiff end cover is installed on the stiff end bearing frame.

Furthermore, the lower end of the sliding end flexible ring is provided with a sliding end cover, and the sliding end cover is installed on the sliding end bearing seat.

Further, the sliding end flexible ring is in interference fit with the sliding end bearing.

Furthermore, the fixed end flexible ring and the sliding end flexible ring are made of polyurethane rubber with oil resistance, long service life and nonlinear rigidity coefficient.

Compared with the prior art, the utility model discloses a beneficial technological effect:

the utility model discloses a single screw compressor star wheel axle flexible bearing seat interference fit has installed the flexible ring between bearing and bearing frame, and the impact load that the flexible ring can reduce the bearing and bear, always and prolong the life of bearing. Purpose, the utility model discloses a design flexible ring between bearing and bearing frame, cut off the transmission of vibrating force, alleviateed the vibration that the gas power causes greatly, improved the bearing live time, and then prolonged the compressor life-span.

Drawings

The present invention will be further explained with reference to the following description of the drawings.

FIG. 1 is a sectional view of a star wheel shaft flexible bearing seat of the single screw compressor of the present invention;

FIG. 2 is an enlarged view of A;

FIG. 3 is an enlarged view of B;

FIG. 4 is a finite element model diagram of a star wheel assembly;

FIG. 5 shows that the supporting counter force with the flexible ring varies with the excitation frequency;

FIG. 6 shows that the support reaction force without flexible ring varies with the excitation frequency;

FIG. 7 is a graph of the bearing amplitude with a flexible ring as a function of the excitation frequency;

FIG. 8 is a graph of the variation of the vibration amplitude of a non-compliant ring bearing with the excitation frequency;

FIG. 9 is a graph showing the variation of the center amplitude of the spider frame with the flexible ring with the excitation frequency;

FIG. 10 is a graph of the center amplitude of the frame of the unflexed ring with the excitation frequency;

FIG. 11 is a diagram showing the motion trajectory of a flexible ring-star wheel shaft when the excitation frequency is 300 Hz;

FIG. 12 is a motion track of a non-flexible ring-star wheel shaft when the excitation frequency is 300 Hz;

description of reference numerals: 1. a fixed end; 2. a spider frame; 3. a star wheel shaft; 4. a sliding end;

1-1, fixing end bearings; 1-2, fixing end covers; 1-3, fixing a bearing seat; 1-4, fixing end flexible ring;

4-1, sliding end bearing; 4-2, sliding end covers; 4-3, sliding end bearing seats; 4-4, sliding end flexible ring.

Detailed Description

As shown in fig. 1-3, the single screw compressor star wheel shaft flexible bearing seat comprises a star wheel shaft 3, a star wheel frame 2 is installed at the middle position of the star wheel shaft 3, and a fixed end 1 and a sliding end 4 are respectively installed at two ends of the star wheel shaft 3.

The fixed end 1 comprises a fixed end bearing 1-1 in key connection with the star wheel shaft 3, a fixed end flexible ring 1-4 is sleeved outside the fixed end bearing 1-1, and the fixed end flexible ring 1-4 and the fixed end bearing 1-1 are in interference fit. The utility model discloses a flexible ring of stiff end, including stiff end flexible ring 1-4, stiff end cover 1-2 is installed to stiff end flexible ring 1-4 outside cover, stiff end cover 1-2 is installed on stiff end bearing frame 1-3, realizes the fixed of stiff end flexible ring 1-4.

The sliding end 4 comprises a sliding end bearing 4-1 in key connection with the star wheel shaft 3, a sliding end flexible ring 4-4 is sleeved outside the sliding end bearing 4-1, and the sliding end flexible ring 4-4 and the sliding end bearing 4-1 are in interference fit. The outer side of the sliding end flexible ring 4-4 is sleeved with a sliding end bearing seat 4-3, the lower end of the sliding end flexible ring 4-4 is provided with a sliding end cover 4-2, and the sliding end cover 4-2 is arranged on the sliding end bearing seat 4-3 to fix the sliding end flexible ring 4-4.

The fixed end flexible ring 1-4 and the sliding end flexible ring 4-4 are made of polyurethane rubber with oil resistance, long service life and nonlinear rigidity coefficient.

The interference of the flexible ring at the fixed end and the sliding end is 0.2mm (0.1 mm in single-side interference fit), and the calculation process is as follows: firstly, the rigidity of the flexible ring is calculated to achieve the damping effect, the material and the structure size of the flexible ring are further determined, and the interference magnitude of the flexible ring is considered. The material, the structure size and the interference of the flexible ring can influence the rigidity of the flexible ring, and under the condition that the material and the structure size are fixed, the interference is 0.2mm in the example, and the damping requirement can be met through calculation.

Example (b):

first, design basis

As shown in the table 1, in the actual operation process, the rotation speed of the star wheel part is 1636.4r/min, the maximum bending moment born during the exhaust is 220Nm, and the exhaust frequency is 300 Hz. The flexible ring is made of polyurethane rubber, the Shore hardness is 80A, and the thickness of the flexible ring is 5 mm.

TABLE 1 parameters of a single screw compressor

Intake air quantity (m3/min)	20
		Exhaust pressure (bar)	8
Screw star wheel tooth ratio	6:11
		Star wheel rotating speed (r/min)	1636.4
Star wheel parts bearing maximum bending moment (Nm)	220
		Exhaust frequency (Hz)	300

Second, analysis and calculation

The star wheel shaft is modeled by a beam188 beam unit, the star wheel frame and the bearing are modeled by a mass unit mass21, meanwhile, the rotational inertia of the star wheel frame is considered, the flexible ring is a combi214 bearing unit, a finite element model is shown in figure 4, under the action of a bending moment of 220Nm and an excitation frequency of 300Hz, the supporting counter force of the fixed end and the sliding end is calculated through ANSYS harmonic response analysis, the calculation result of the existence of the flexible ring is compared, the stress is obviously improved, and the result is compared with a table 2 shown in figures 5-12.

TABLE 2 comparison of results

	With flexible rings	Without flexible ring	Reduction ratio (%)
				Fixed end support counter-force (N)	120.75	616.51	80.4
Sliding end support counter force (N)	131.15	721.36	81.8
				Fixed end amplitude (mm)	0.0468	0.225*10^-5
Sliding end amplitude (mm)	0.0662	0.264*10^-5
				Star wheel rack amplitude (mm)	0.0033	0.00144

The above-mentioned embodiments are only intended to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and those skilled in the art should also be able to make various modifications and improvements to the technical solution of the present invention without departing from the spirit of the present invention, and all such modifications and improvements are intended to fall within the scope of the present invention as defined in the appended claims.

Claims

1. The utility model provides a single screw compressor star wheel axle flexible bearing frame which characterized in that: the planet carrier comprises a planet shaft (3), wherein a planet carrier (2) is arranged in the middle of the planet shaft (3), and a fixed end (1) and a sliding end (4) are respectively arranged at two ends of the planet shaft (3); the fixed end (1) comprises a fixed end bearing (1-1) in key connection with the star wheel shaft (3), a fixed end flexible ring (1-4) is sleeved outside the fixed end bearing (1-1), and a fixed end bearing seat (1-3) is sleeved outside the fixed end flexible ring (1-4); the sliding end (4) comprises a sliding end bearing (4-1) in key connection with the star wheel shaft (3), a sliding end flexible ring (4-4) is sleeved outside the sliding end bearing (4-1), and a sliding end bearing seat (4-3) is sleeved outside the sliding end flexible ring (4-4).

2. The single screw compressor star wheel shaft flexible bearing block of claim 1, wherein: the fixed end flexible ring (1-4) is in interference fit with the fixed end bearing (1-1).

3. The single screw compressor star wheel shaft flexible bearing block of claim 1, wherein: the lower extreme of stiff end flexible ring (1-4) is provided with stiff end cover (1-2), stiff end cover (1-2) are installed on stiff end bearing frame (1-3).

4. The single screw compressor star wheel shaft flexible bearing block of claim 1, wherein: the lower end of the sliding end flexible ring (4-4) is provided with a sliding end cover (4-2), and the sliding end cover (4-2) is installed on a sliding end bearing seat (4-3).

5. The single screw compressor star wheel shaft flexible bearing block of claim 1, wherein: the sliding end flexible ring (4-4) is in interference fit with the sliding end bearing (4-1).

6. The single screw compressor star wheel shaft flexible bearing block of claim 1, wherein: the fixed end flexible ring (1-4) and the sliding end flexible ring (4-4) are made of polyurethane rubber with oil resistance, long service life and nonlinear rigidity coefficient.