CN114301224B

CN114301224B - Drop-shaped balance block, rotor and compressor

Info

Publication number: CN114301224B
Application number: CN202111623039.5A
Authority: CN
Inventors: 罗岳华
Original assignee: Hunan Tpys Compressor Technology Co ltd
Current assignee: Hunan Tpys Compressor Technology Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2024-02-27
Anticipated expiration: 2041-12-28
Also published as: CN114301224A

Abstract

The invention discloses a drop-shaped balance block, a rotor and a compressor, comprising a windward part, wherein the windward part is connected with a leeward part; the upper surface of the windward part is spherical, and the lower surface is a plane; the leeward part is an arc shape with gradually reduced width and height from the adjacent windward part to the windward part; the bottom surface of the leeward part is a plane. The invention reduces vibration and noise in the running process of the compressor and improves the reliability and energy efficiency of the compressor.

Description

Drop-shaped balance block, rotor and compressor

Technical Field

The invention relates to the field of machinery, in particular to a drop-shaped balance weight, a rotor and a compressor.

Background

1. Because of the structural characteristics of the compressor, the rotating body of the compressor has unbalanced eccentric mass, and vibration, noise and alternating stress can be generated in the rotating process.

2. In the conventional balancing structure, as shown in fig. 1, in order to balance eccentric mass, upper end face balancing weights 2 and lower end face balancing weights 3 are respectively installed on upper and lower end faces of a motor rotor 1, and the windward section of the balancing weights is rectangular or triangular. In the process of rotor rotation, the windward side and the leeward side of the balance weight are subjected to air resistance, and the traditional balance weight is subjected to larger air resistance, so that useless power of the compressor is increased.

3. The traditional balance weight can also cause larger air turbulence when the motor rotor rotates and drives, thereby generating noise.

4. The traditional balance weight is riveted with the rotor by using rivets, the balance weight is provided with holes, the end face of the rotor is provided with protrusions, and the holes and the protrusions can increase gas resistance and turbulence to generate noise.

Disclosure of Invention

In order to solve the technical problems, the invention provides a drop-shaped balance block, a rotor and a compressor. The invention reduces vibration and noise in the running process of the compressor and improves the reliability and energy efficiency of the compressor.

The aim of the invention is achieved by the following technical scheme:

a drop-shaped balance block comprises a windward part 4, wherein the windward part 4 is connected with a leeward part 41; the upper surface of the windward part 4 is spherical, and the lower surface is a plane; the leeward part 41 is an arc shape with gradually reduced width and height from the adjacent windward part 4 to the far windward part 4; the bottom surface of the lee portion 41 is a flat surface.

Further improved, the upper surface of the leeward part 41 is a smooth arc surface.

Further, the windward portion 4 and the leeward portion 41 are connected to form a drop shape which is cut evenly in the longitudinal direction.

Further improved, the shape of the balance block is obtained through the following steps:

step one, obtaining a water drop-shaped curve through a Cartesian coordinate system formula:

x(t)=20*(2*Sin(t)+Sin(2*t))/(5+4*Cos(t))

y(t)=-20*(4*Cos(t)+Cos(2*t))/(5+4*Cos(t))；

step two, obtaining the central axis of the water drop-shaped curve, and then bending the water drop-shaped curve to enable the central axis of the water drop-shaped curve to be bent into an arc shape; and the tail end of the balance block forms a round chamfer with the radius of 2 mm.

Further improvement, the bottom of the drop-shaped balance weight is provided with a plurality of pin holes or threaded holes.

The rotor is characterized by comprising a rotor body 7, wherein the water drop-shaped balance weight is arranged on the rotor body 7, and a central axis which is bent to form an arc shape is coaxially arranged with the rotor body 7.

In a further improvement, a plurality of through holes 9 are formed in the rotor along the circumferential direction, and connecting structures for fixing the drop-shaped balance blocks and the rotor body 7 are penetrated in the through holes 9.

Further improvement, the connection structure is a rivet 6 or a bolt.

Further improved, the drop-shaped balance block comprises an upper balance block 5 arranged at the upper end of the rotor body 7 and a lower balance block 8 arranged at the lower end of the rotor body 7.

A compressor is provided with the rotor.

The invention has the beneficial effects that:

vibration and noise in the running process of the compressor are reduced, and reliability and energy efficiency of the compressor are improved.

Drawings

The invention is further illustrated by the accompanying drawings, the content of which does not constitute any limitation of the invention.

FIG. 1 is a schematic diagram of a conventional counterweight and rotor connection structure;

FIG. 2 is a schematic view of the mounting structure of the balance weight and rotor connection of the present invention;

FIG. 3 is a schematic top view of a weight;

FIG. 4 is a schematic side view of a weight;

fig. 5 is a schematic diagram of the formation of the weight.

Detailed Description

The invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the invention more apparent.

Example 1

The main characteristics of the drop-shaped balance block are as shown in fig. 1:

1. the balancing weight is in a drop shape along the rotating direction, the projection curve is a drop curve (figure 3), the upper half part of the longitudinal section is a drop curve, the lower half part of the longitudinal section is a straight line (figure 3), the windage coefficient is far lower than that of the balancing weight with the cross section in the shape of a traditional rectangle, a triangle and the like, the vibration and the noise of the compressor in the rotating process are reduced, and the reliability and the energy efficiency of the compressor are improved.

As shown in fig. 5, the weight profile is obtained by:

x(t)=20*(2*Sin(t)+Sin(2*t))/(5+4*Cos(t))

y(t)=-20*(4*Cos(t)+Cos(2*t))/(5+4*Cos(t))；

step two, obtaining the central axis of the water drop-shaped curve, and then bending the water drop-shaped curve to enable the central axis of the water drop-shaped curve to be bent into an arc shape; for the convenience of processing, the tail end of the cutter is processed to form a round chamfer with the radius of 2 mm.

2. Compared with the prior balancing block with holes on the surface, the balancing block has no holes on the surface, reduces turbulence caused in the rotating process, reduces vibration and noise of the compressor in the rotating process, and improves the reliability and energy efficiency of the compressor.

3. The rotor and the balance weight connecting bolt or rivet 6 has no protrusion on the surface of the rotor, so that wind resistance caused by the protrusion of the bolt or rivet on the traditional rotor is eliminated.

Through calculation and analysis, the wind resistance coefficient value Cd of the traditional balance weight=0.5, and the wind resistance coefficient Cd of the balance weight=0.09 of the patent is compared with the traditional balance weight, so that the wind resistance coefficient is reduced by 82%.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. The drop-shaped balance block is characterized by comprising a windward part (4), wherein the windward part (4) is connected with a leeward part (41); the upper surface of the windward part (4) is spherical, and the lower surface is a plane; the leeward part (41) is an arc shape with gradually reduced width and height from the adjacent windward part (4) to the windward part (4); the bottom surface of the leeward part (41) is a plane; the shape of the balance weight is obtained through the following steps:

x(t)=20*(2*Sin(t)+Sin(2*t))/(5+4*Cos(t))

y(t)=-20*(4*Cos(t)+Cos(2*t))/(5+4*Cos(t))；

2. A drop-shaped counterweight as claimed in claim 1, wherein the upper surface of the leeward portion (41) is a smooth arcuate surface.

3. The drop-shaped counterweight according to claim 1, characterized in that the windward portion (4) and the leeward portion (41) are connected to form a drop-shape cut evenly along the length direction.

4. The drop-shaped weight of claim 1, wherein the bottom of the drop-shaped weight is formed with a plurality of pin or threaded holes.

5. A rotor, characterized by comprising a rotor body (7), on which rotor body (7) a drop-shaped counterweight according to any one of claims 1-4 is mounted.

6. A rotor according to claim 5, characterized in that the rotor is formed with a plurality of through holes (9) in the circumferential direction, and connecting structures for fixing the drop-shaped weights and the rotor body (7) are penetrated in the through holes (9).

7. A rotor according to claim 6, characterized in that the connection structure is a rivet (6) or a bolt.

8. A rotor according to claim 6, characterized in that the drop-shaped weight comprises an upper weight (5) mounted at the upper end of the rotor body (7) and a lower weight (8) mounted at the lower end of the rotor body (7).

9. A compressor mounting the rotor of claim 5.