CN215486592U

CN215486592U - Pump body structure and rotary fluid machine

Info

Publication number: CN215486592U
Application number: CN202121734427.6U
Authority: CN
Inventors: 闫鹏举; 王珺; 张心爱; 张大鹏; 黄纯浚
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2022-01-11
Anticipated expiration: 2031-07-28

Abstract

The application provides a pump body structure and a rotary fluid machine. This pump body structure includes upper flange (7), cylinder (6), lower flange (5) and bent axle (1), bent axle (1) is including eccentric portion (13), major axis (15) and minor axis (12), the downside of eccentric portion (13) is provided with first thrust portion (14), first thrust portion (14) have with lower flange (5) complex first thrust surface, upper flange (7) have first shaft hole (10) and second shaft hole (11), second shaft hole (11) are located the top in first shaft hole (10), be provided with second thrust portion (8) on major axis (15), second thrust portion (8) are located second shaft hole (11), second thrust portion (8) have with the second thrust surface of the bottom surface complex of second shaft hole (11). According to the pump body structure of the application, the thrust area of the crankshaft can be increased, the stability and the reliability of the operation of the crankshaft are improved, and the vibration and the noise of the whole machine of the miniaturized rotary fluid machine are reduced.

Description

Pump body structure and rotary fluid machine

Technical Field

The application relates to the technical field of rotary mechanical equipment, in particular to a pump body structure and a rotary fluid machine.

Background

The pump body structure of the rolling rotor compressor mainly comprises an air cylinder, a rolling piston, a crankshaft, a slip sheet, a spring and flanges assembled at two ends of the air cylinder. For the development of a single-cylinder rolling rotor compressor in the direction of miniaturization and high efficiency, the following two bottleneck problems mainly exist, namely the energy efficiency caused by the complete machine miniaturization of the compressor is low; secondly, the problem of noise and vibration caused by the miniaturization of the whole compressor is large. In addition, the compressor may have a cold pressing height out of tolerance in a rotor cold pressing process, and then the height difference of the stator and the rotor cannot be guaranteed to be within a designed value range, which may cause the energy efficiency of the compressor to be reduced and the operational reliability of the compressor to be deteriorated.

In the prior art, in order to reduce the influence of gas leakage and clearance volume on the volumetric efficiency of the pump body of the small-displacement compressor, the whole pump body can adopt a flat design, the inner diameter of a cylinder is increased, and meanwhile, the eccentric amount of an eccentric part can be correspondingly increased, so that the circumferential leakage amount of a gas refrigerant from a compression cavity to an air suction cavity is reduced, and the low-frequency refrigerating capacity of the compressor is improved. Generally, in order to reduce friction power consumption at an eccentric bearing and reduce radial leakage of a gas refrigerant along an end surface of a roller, the outer diameter of an eccentric circle of a crankshaft is reduced while the thickness of the roller is increased, however, the area of a lower thrust surface of the crankshaft is correspondingly reduced, and therefore energy efficiency, vibration noise and operation reliability of a compressor are affected.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the application is to provide a pump body structure and a rotary fluid machine, which can increase the thrust area of a crankshaft, improve the running stability and reliability of the crankshaft, and reduce the overall vibration and noise of the miniaturized rotary fluid machine.

In order to solve the problem, the application provides a pump body structure, including the upper flange, the cylinder, lower flange and bent axle, the bent axle includes eccentric portion, major axis and minor axis are located the axial both sides of eccentric portion, major axis and upper flange normal running fit, minor axis and lower flange normal running fit, the minor axis place side of eccentric portion is provided with first thrust portion, first thrust portion has the first thrust surface with lower flange complex, the upper flange has first shaft hole and second shaft hole, the second shaft hole is located the top in first shaft hole, be provided with second thrust portion on the major axis, second thrust portion is located the second shaft hole, second thrust portion has the second thrust surface with the bottom surface complex of second shaft hole.

Preferably, the crankshaft is further provided with a main balance part, and the main balance part is arranged on the upper side of the second thrust part.

Preferably, the upper end of the main balancing part is provided with a limiting surface, and the limiting surface is configured to limit the cold pressing height of the rotor assembly.

Preferably, the main balance is made of ductile iron.

Preferably, the main balance part and the crankshaft are of an integrated structure.

Preferably, the eccentric part and the crankshaft are in a split structure and are fixedly connected together.

Preferably, the area of the first thrust surface is S1, the area of the second thrust surface is S2, 0.6 ≦ (S2/S1) ≦ 2.

Preferably, the axial depth of the first shaft hole is h3, the axial depth of the second shaft hole is h1, and the axial length of the second thrust part is h2, wherein h1, h2 and h3 meet the conditions that the distance between 0 and h2 and h1 is equal to or less than 0.05mm, and the distance between 0.05 and h1/h3 is equal to or less than 0.2.

According to another aspect of the present application, there is provided a rotary fluid machine including a pump body structure as described above.

Preferably, the rotary fluid machine is one of a rotary compressor, a rotary expander, a sliding vane compressor and a sliding vane expander.

The application provides a pump body structure, including the upper flange, the cylinder, lower flange and bent axle, the bent axle includes eccentric portion, major axis and minor axis are located the axial both sides of eccentric portion, major axis and upper flange normal running fit, minor axis and lower flange normal running fit, the minor axis place side of eccentric portion is provided with first thrust portion, first thrust portion have with the first thrust face of lower flange complex, the upper flange has first shaft hole and second shaft hole, the second shaft hole is located the top in first shaft hole, be provided with second thrust portion on the major axis, second thrust portion is located the second shaft hole, second thrust portion have with the second thrust face of the bottom surface complex of second shaft hole. This pump body structure has carried out structural transformation to last flange and bent axle, increased the second shaft hole on last flange, and increased second thrust portion on the bent axle, the second thrust face and the second shaft hole that utilize second thrust portion cooperate, form second thrust structure, cooperate with the first thrust face of first thrust portion and the first thrust structure that lower flange cooperation formed, can be under the condition that does not increase eccentric mass, increase the axial supporting area of bent axle, thereby effectively improve bent axle moving stationarity and reliability, reduce miniaturized rotation type fluid machinery's complete machine vibration and noise.

Drawings

FIG. 1 is a cross-sectional block diagram of a pump block structure according to one embodiment of the present application;

FIG. 2 is a cross-sectional structural view of an upper flange of the pump body structure according to one embodiment of the present application;

FIG. 3 is a schematic view of a crankshaft of the pump block configuration according to an embodiment of the present application;

FIG. 4 is a graph comparing vibration acceleration of a compressor of the related art with that of the embodiment of the present application;

fig. 5 is a graph comparing energy efficiency of a compressor of the related art with that of the embodiment of the present application.

The reference numerals are represented as:

1. a crankshaft; 2. a rotor assembly; 3. sliding blades; 4. a roller; 5. a lower flange; 6. a cylinder; 7. an upper flange; 8. a second thrust portion; 9. a main balance section; 10. a first shaft hole; 11. a second shaft hole; 12. a minor axis; 13. an eccentric portion; 14. a first thrust part; 15. a long axis.

Detailed Description

Referring to fig. 1 to 5 in combination, according to an embodiment of the present application, the pump body structure includes an upper flange 7, a cylinder 6, a lower flange 5, and a crankshaft 1, where the crankshaft 1 includes an eccentric portion 13, a long axis 15 and a short axis 12, the long axis 15 and the short axis 12 are located at two axial sides of the eccentric portion 13, the long axis 15 is rotationally matched with the upper flange 7, the short axis 12 is rotationally matched with the lower flange 5, a first thrust portion 14 is located at a side of the short axis 12 of the eccentric portion 13, the first thrust portion 14 has a first thrust surface matched with the lower flange 5, the upper flange 7 has a first axis hole 10 and a second axis hole 11, the second axis hole 11 is located at a top of the first axis hole 10, a second thrust portion 8 is located on the long axis 15, the second thrust portion 8 is located in the second axis hole 11, and the second thrust portion 8 has a second thrust surface matched with a bottom surface of the second axis hole 11.

This pump body structure has carried out the institutional advancement to last flange 7 and bent axle 1, last flange 7 has increased second shaft hole 11, and increased second thrust portion 8 on bent axle 1, the second thrust face that utilizes second thrust portion 8 cooperates with second shaft hole 11, form second thrust structure, cooperate the first thrust structure that forms with the first thrust face of first thrust portion 14 and lower flange 5, can be under the condition that does not increase eccentric mass, increase bent axle 1's axial bearing area, thereby effectively improve bent axle 1 moving stationarity and reliability, reduce miniaturized rotation type fluid machinery's complete machine vibration and noise. The rotary fluid machine is, for example, a compressor.

In the pump body structure in this embodiment, the second thrust portion 8, the second shaft hole 11, and the upper flange 7 together form a bearing structure for supporting the long shaft 15 of the crankshaft 1, and compared with a conventional bearing structure, the effective supporting length of the upper flange for the long shaft 15 of the crankshaft 1 is increased, the running axis track of the crankshaft 1 is effectively improved, the friction power consumption between the upper and lower flanges and the crankshaft 1 is reduced, and the overall energy efficiency of the rotary fluid machine is improved.

In this embodiment, the second thrust portion 8 is an annular protrusion, the diameter of the second shaft hole 11 is larger than that of the first shaft hole 10, the first shaft hole 10 and the second shaft hole 11 form a stopping step at a connecting position, and a step surface of the stopping step forms a thrust ring surface. The first thrust part 14 is located below the eccentric part 13, the lower end face of the first thrust part 14 is in contact with the upper end face of the lower flange 5, the second thrust part 8 is located on the long shaft 15, and the lower end face of the second thrust part 8 is in contact with the thrust ring face of the inner hole of the second shaft hole 11, so that a double thrust structure is formed, the axial thrust area of the crankshaft is effectively increased, the energy efficiency of the rotary fluid machine such as a compressor is improved, and the working noise of the rotary fluid machine is reduced.

In one embodiment, a roller 4 is arranged in the cylinder 6, a slide sheet groove is arranged on the cylinder 6, a slide sheet 3 is arranged in the slide sheet groove, one end of the slide sheet 3 is provided with a spring, and the other end of the slide sheet abuts against the roller 4 so as to be matched with the roller 4 and divide the inner cavity of the cylinder 6 into a compression cavity and an exhaust cavity.

In one embodiment, the crankshaft 1 is further provided with a main balance portion 9, and the main balance portion 9 is disposed on the upper side of the second thrust portion 8. By adding the main balance part 9 on the crankshaft 1, the unbalanced inertia force of the compressor during rotation can be balanced, the stability of the crankshaft in the rotation process is improved, and the working performance of a pump body structure is improved.

In one embodiment, the upper end of the main balance part 9 is provided with a limiting surface, the limiting surface is configured to limit the cold pressing height of the rotor assembly 2, the limiting surface can be matched with the rotor assembly 2, the cold pressing height of the rotor assembly 2 is ensured to be within a design value, meanwhile, the matching relation between the limiting surface and the rotor assembly 2 is utilized, the installation procedure of the main balance part 9 and the rotor assembly can be omitted, and the working time and the process cost are saved.

In one embodiment, the main balance 9 is made of ductile iron. Although ductile iron may be magnetically conductive, the motor may suffer from iron losses and power consumption may increase by a small amount. But for a small compressor, the cost and the energy efficiency are comprehensively measured, and after the ball-milling cast iron is adopted, the energy efficiency of the motor is limited, and the cost reduction effect is more prominent.

In one embodiment, the main balance 9 and the crankshaft 1 are of a unitary construction. When the main balance part 9 is made of nodular cast iron, the main balance part 9 and the crankshaft 1 are of an integrated structure, a crankshaft blank can be directly machined and formed, the main balance part 9 is made of nodular cast iron, and the conventional balance weight is mostly made of high manganese steel or brass, so that the material cost of the main balance part 9 is only 0.16-0.2 times that of the conventional balance weight, the material cost of the compressor is greatly reduced, and the vibration and noise of the whole compressor are effectively improved on the basis of reducing the material cost of parts.

In one embodiment, the eccentric portion 13 and the crankshaft 1 are formed in a separate structure and are fixedly coupled together. Compare conventional bent axle, the eccentric portion 13 of this application embodiment adopts split type structure with bent axle 1, and the two passes through screw thread fixed connection, both conveniently realizes the change maintenance of eccentric portion 13, also can make things convenient for the installation operation of bent axle 1, reduces bent axle 1's the installation degree of difficulty.

In one embodiment, the area of the first thrust surface is S1, the area of the second thrust surface is S2, and the area of the second thrust surface is more than or equal to 0.6 (S2/S1) and less than or equal to 2, so that the thrust area of the crankshaft can be increased, the running smoothness of the crankshaft can be improved, and the overall vibration and noise of the miniaturized rotary fluid machine can be reduced.

In one embodiment, the axial depth of the first shaft hole 10 is h3, the axial depth of the second shaft hole 11 is h1, and the axial length of the second thrust portion 8 is h2, wherein h1, h2 and h3 meet the requirements that h2-h1 is more than or equal to 0.05mm and h1/h3 is more than or equal to 0.05mm, so that the ratio of the axial lengths of the first shaft hole 10 and the second shaft hole 11 can be reasonably set, compared with a conventional main bearing, the scheme increases the effective supporting length of the upper flange 7 to the long shaft 15 of the crankshaft 1, optimizes the friction state between friction pairs, effectively improves the track of the crankshaft, reduces the friction power consumption of the upper flange 7 and the crankshaft 1, and improves the energy efficiency of the compressor.

Referring to fig. 1 to 5 in combination, according to an embodiment of the present application, a rotary fluid machine includes a pump body structure, which is the pump body structure described above.

In one embodiment, the rotary fluid machine is one of a rotary compressor, a rotary expander, a sliding vane compressor, and a sliding vane expander.

Referring to fig. 4 and 5 in combination, the vibration acceleration and energy efficiency of the compressor of the embodiment of the present application are compared. As can be seen from FIG. 4, the vibration acceleration of the whole compressor adopting the embodiment of the present application is significantly lower than that of the compressor in the related art, and is reduced by 5m/s2 on average. As can be seen from fig. 5, compared with the compressor in the related art, in the compressor of the embodiment of the present application, the pump body friction power consumption is reduced, so that the overall energy efficiency is improved by about 5%, and therefore, the working energy efficiency of the compressor is effectively improved.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. A pump body structure is characterized by comprising an upper flange (7), a cylinder (6), a lower flange (5) and a crankshaft (1), wherein the crankshaft (1) comprises an eccentric part (13), a long shaft (15) and a short shaft (12), the long shaft (15) and the short shaft (12) are positioned on two axial sides of the eccentric part (13), the long shaft (15) is in running fit with the upper flange (7), the short shaft (12) is in running fit with the lower flange (5), a first thrust part (14) is arranged on the lower side of the eccentric part (13), the first thrust part (14) is provided with a first thrust surface matched with the lower flange (5), the upper flange (7) is provided with a first shaft hole (10) and a second shaft hole (11), the second shaft hole (11) is positioned at the top of the first shaft hole (10), and a second thrust part (8) is arranged on the long shaft (15), the second thrust part (8) is located in the second shaft hole (11), and the second thrust part (8) is provided with a second thrust surface matched with the bottom surface of the second shaft hole (11).

2. The pump body structure according to claim 1, characterized in that a main balance portion (9) is further provided on the crankshaft (1), the main balance portion (9) being provided on an upper side of the second thrust portion (8).

3. The pump body structure according to claim 2, characterized in that the upper end of the main balancing portion (9) is provided with a limiting surface configured to limit the cold pressing height of the rotor assembly (2).

4. The pump body structure according to claim 2, characterized in that the main balance portion (9) is made of ductile iron.

5. The pump body structure according to any one of claims 2 to 4, characterized in that the main balance portion (9) and the crankshaft (1) are of a unitary structure.

6. The pump body structure according to any one of claims 1 to 4, characterized in that the eccentric portion (13) and the crankshaft (1) are of a split structure and are fixedly connected together.

7. The pump body structure according to claim 1, wherein the area of the first thrust surface is S1, and the area of the second thrust surface is S2, 0.6 ≦ (S2/S1) ≦ 2.

8. The pump body structure according to claim 1, wherein the axial depth of the first shaft hole (10) is h3, the axial depth of the second shaft hole (11) is h1, and the axial length of the second thrust portion (8) is h2, wherein h1, h2 and h3 satisfy 0. ltoreq. h2-h 1. ltoreq.0.05 mm, and 0.05. ltoreq. h1/h 3. ltoreq.0.2.

9. Rotary fluid machine comprising a pump body structure, characterized in that it is a pump body structure according to any one of claims 1 to 8.

10. The rotary fluid machine of claim 9, wherein the rotary fluid machine is one of a rotary compressor, a rotary expander, a sliding vane compressor, and a sliding vane expander.