Pump structure and rotary fluid machinery

Abstract

The present application provides a pump body structure and a rotary fluid machine. The pump body structure comprises an upper flange (7), a cylinder (6), a lower flange (5) and a crankshaft (1), wherein the crankshaft (1) comprises an eccentric portion (13), a long shaft (15) and a short shaft (12), wherein a first thrust portion (14) is arranged at the lower side of the eccentric portion (13), wherein the first thrust portion (14) has a first thrust surface matched with the lower flange (5), wherein the upper flange (7) has a first shaft hole (10) and a second shaft hole (11), wherein the second shaft hole (11) is located at the top of the first shaft hole (10), wherein a second thrust portion (8) is arranged on the long shaft (15), wherein the second thrust portion (8) is located in the second shaft hole (11), wherein the second thrust portion (8) has a second thrust surface matched with the bottom surface of the second shaft hole (11). According to the pump body structure of the present application, the crankshaft thrust area can be increased, the stability and reliability of the crankshaft operation can be improved, and the vibration and noise of the whole machine of the miniaturized rotary fluid machine can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of rotary mechanical equipment, and in particular to a pump body structure and a rotary fluid machinery. Background Art

[0002] The pump body structure of the rolling rotor compressor is mainly composed of a cylinder, a rolling piston, a crankshaft, a vane, a spring, and flanges assembled at both ends of the cylinder. For the development of single-cylinder rolling rotor compressors in the direction of miniaturization and high efficiency, there are mainly two bottleneck problems: one is the low energy efficiency caused by the miniaturization of the compressor; the other is the high noise and vibration caused by the miniaturization of the compressor. In addition, the compressor may have a problem of excessive cold pressing height during the rotor cold pressing process, and thus cannot ensure that the height difference between the stator and the rotor is within the design value range, which may lead to reduced compressor energy efficiency and deterioration of compressor operation reliability.

[0003] In the prior art, in order to reduce the impact of gas leakage and clearance volume on the volumetric efficiency of the small-displacement compressor pump body, the pump body as a whole will adopt a flattened design. When the inner diameter of the cylinder is increased, the eccentricity of the eccentric part will also be increased accordingly, thereby reducing the circumferential leakage of the gas refrigerant from the compression chamber to the suction chamber and improving the low-frequency refrigeration capacity of the compressor. In general, in order to reduce the friction power consumption at the eccentric bearing and reduce the radial leakage of the gas refrigerant along the roller end face, the outer diameter of the crankshaft eccentric circle will be reduced and the roller thickness will be increased. However, the area of ​​the lower thrust surface of the crankshaft will also be reduced accordingly, thereby affecting the energy efficiency, vibration noise and compressor operation reliability of the compressor. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to provide a pump body structure and a rotary fluid machinery that can increase the crankshaft thrust area, improve the stability and reliability of the crankshaft operation, and reduce the overall vibration and noise of the miniaturized rotary fluid machinery.

[0005] In order to solve the above problems, the present application provides a pump body structure, including an upper flange, a cylinder, a lower flange and a crankshaft, the crankshaft including an eccentric part, a long shaft and a short shaft, the long shaft and the short shaft are located on both axial sides of the eccentric part, the long shaft is rotatably matched with the upper flange, the short shaft is rotatably matched with the lower flange, a first thrust portion is provided on the side where the short shaft of the eccentric part is located, the first thrust portion has a first thrust surface that cooperates with the lower flange, the upper flange has a first axial hole and a second axial hole, the second axial hole is located at the top of the first axial hole, a second thrust portion is provided on the long shaft, the second thrust portion is located in the second axial hole, and the second thrust portion has a second thrust surface that cooperates with the bottom surface of the second axial hole.

[0006] Preferably, a main balance portion is also provided on the crankshaft, and the main balance portion is provided on the upper side of the second thrust portion.

[0007] Preferably, a limiting surface is provided at the upper end of the main balancing portion, and the limiting surface is configured to limit the cold pressing height of the rotor assembly.

[0008] Preferably, the main balancing part is made of ductile iron.

[0009] Preferably, the main balancer and the crankshaft are an integrated structure.

[0010] Preferably, the eccentric portion and the crankshaft adopt a split structure and are fixedly connected together.

[0011] Preferably, the area of ​​the first thrust surface is S1, the area of ​​the second thrust surface is S2, and 0.6≤(S2 / S1)≤2.

[0012] Preferably, the axial depth of the first axial hole is h3, the axial depth of the second axial hole is h1, and the axial length of the second thrust portion is h2, wherein h1, h2 and h3 satisfy 0≤h2-h1≤0.05mm, 0.05≤h1 / h3≤0.2.

[0013] According to another aspect of the present application, a rotary fluid machinery is provided, comprising a pump body structure, which is the above-mentioned pump body structure.

[0014] Preferably, the rotary fluid machinery is one of a rotary compressor, a rotary expander, a vane compressor and a vane expander.

[0015] The pump body structure provided by the present application includes an upper flange, a cylinder, a lower flange and a crankshaft. The crankshaft includes an eccentric part, a long shaft and a short shaft. The long shaft and the short shaft are located on both axial sides of the eccentric part. The long shaft is rotatably matched with the upper flange, and the short shaft is rotatably matched with the lower flange. A first thrust portion is arranged on the side where the short shaft of the eccentric part is located. The first thrust portion has a first thrust surface that cooperates with the lower flange. The upper flange has a first axial hole and a second axial hole. The second axial hole is located at the top of the first axial hole. A second thrust portion is arranged on the long shaft. The second thrust portion is located in the second axial hole. The second thrust portion has a second thrust surface that cooperates with the bottom surface of the second axial hole. The pump body structure has undergone structural transformation on the upper flange and the crankshaft, a second shaft hole has been added to the upper flange, and a second thrust portion has been added to the crankshaft, and the second thrust surface of the second thrust portion is matched with the second shaft hole to form a second thrust structure, which is matched with the first thrust structure formed by the first thrust surface of the first thrust portion and the lower flange, thereby increasing the axial support area of ​​the crankshaft without increasing the eccentric mass, thereby effectively improving the stability and reliability of the crankshaft operation and reducing the overall vibration and noise of the miniaturized rotary fluid machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional structural diagram of a pump body structure according to an embodiment of the present application;

[0017] Figure 2 A cross-sectional structural diagram of an upper flange of a pump body structure according to an embodiment of the present application;

[0018] Figure 3 A schematic structural diagram of a crankshaft of a pump body structure according to an embodiment of the present application;

[0019] Figure 4 A comparison diagram of vibration acceleration between a compressor in the related art and a compressor in an embodiment of the present application;

[0020] Figure 5 The figure is a comparison chart of energy efficiency between the compressor of the related art and the compressor of the embodiment of the present application.

[0021] The reference numerals are:

[0022] 1. Crankshaft; 2. Rotor assembly; 3. Slide; 4. Roller; 5. Lower flange; 6. Cylinder; 7. Upper flange; 8. Second thrust portion; 9. Main balancing portion; 10. First shaft hole; 11. Second shaft hole; 12. Short shaft; 13. Eccentric portion; 14. First thrust portion; 15. Long shaft. DETAILED DESCRIPTION

[0023] See also Figures 1 to 5 As shown, 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, the crankshaft 1 includes an eccentric portion 13, a long shaft 15 and a short shaft 12, the long shaft 15 and the short shaft 12 are located on both axial sides of the eccentric portion 13, the long shaft 15 is rotatably matched with the upper flange 7, the short shaft 12 is rotatably matched with the lower flange 5, a first thrust portion 14 is provided on the side where the short shaft 12 of the eccentric portion 13 is located, the first thrust portion 14 has a first thrust surface that cooperates with the lower flange 5, the upper flange 7 has a first axial hole 10 and a second axial hole 11, the second axial hole 11 is located at the top of the first axial hole 10, a second thrust portion 8 is provided on the long shaft 15, the second thrust portion 8 is located in the second axial hole 11, and the second thrust portion 8 has a second thrust surface that cooperates with the bottom surface of the second axial hole 11.

[0024] The pump body structure has structurally modified the upper flange 7 and the crankshaft 1, added a second shaft hole 11 on the upper flange 7, and added a second thrust portion 8 on the crankshaft 1, and the second thrust surface of the second thrust portion 8 cooperates with the second shaft hole 11 to form a second thrust structure, which cooperates with the first thrust surface of the first thrust portion 14 and the first thrust structure formed by the lower flange 5, and can increase the axial support area of ​​the crankshaft 1 without increasing the eccentric mass, thereby effectively improving the stability and reliability of the operation of the crankshaft 1, and reducing the vibration and noise of the whole machine of the miniaturized rotary fluid machinery. The rotary fluid machinery is, for example, a compressor.

[0025] The pump body structure, the second thrust portion 8, the second axial hole 11 and the upper flange 7 in this embodiment together constitute a bearing structure for supporting the long axis 15 of the crankshaft 1. Compared with the conventional bearing structure, the effective supporting length of the upper flange for the long axis 15 of the crankshaft 1 is increased, the axial trajectory 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 machinery is improved.

[0026] In this embodiment, the second thrust portion 8 is an annular protrusion, the diameter of the second shaft hole 11 is larger than the diameter of the first shaft hole 10, and the first shaft hole 10 and the second shaft hole 11 form a stop step at the connection position, and the step surface of the stop step forms a thrust ring surface. The first thrust portion 14 is located below the eccentric portion 13, and the lower end surface of the first thrust portion 14 contacts the upper end surface of the lower flange 5. The second thrust portion 8 is located on the long shaft 15, and the lower end surface of the second thrust portion 8 contacts the thrust ring surface of the inner hole of the second shaft hole 11, forming a double thrust structure, thereby effectively increasing the axial thrust area of ​​the crankshaft, improving the energy efficiency of rotary fluid machinery such as compressors, and reducing the working noise of rotary fluid machinery.

[0027] In one embodiment, a roller 4 is provided in the cylinder 6, a vane groove is provided on the cylinder 6, a vane 3 is provided in the vane groove, a spring is provided at one end of the vane 3, and the other end abuts against the roller 4, thereby cooperating with the roller 4 to divide the inner cavity of the cylinder 6 into a compression cavity and an exhaust cavity.

[0028] In one embodiment, a main balancing portion 9 is further provided on the crankshaft 1, and the main balancing portion 9 is provided on the upper side of the second thrust portion 8. By adding the main balancing portion 9 to the crankshaft 1, the unbalanced inertial force of the compressor during rotation can be balanced, the stability of the crankshaft during rotation is improved, and the working performance of the pump body structure is improved.

[0029] In one embodiment, a limiting surface is provided at the upper end of the main balancing part 9, and the limiting surface is configured to limit the cold pressing height of the rotor assembly 2. The limiting surface can be used in conjunction with the rotor assembly 2 to ensure that the cold pressing height of the rotor assembly 2 is within the design value. At the same time, the matching relationship between the limiting surface and the rotor assembly 2 can be used to omit the installation process of the main balancing part 9 and the rotor assembly, saving labor time and process costs.

[0030] In one embodiment, the main balance part 9 is made of ductile iron. Although ductile iron may be magnetic, the motor may have iron loss and the power consumption may increase slightly. However, for small compressors, after comprehensively weighing the cost and energy efficiency, the use of ductile iron will have limited impact on the energy efficiency of the motor, while the cost reduction effect will be more prominent.

[0031] In one embodiment, the main balance part 9 and the crankshaft 1 are an integrated structure. When the main balance part 9 is made of ductile iron, since the main balance part 9 and the crankshaft 1 are an integrated structure, the crankshaft blank can be directly processed and formed. The material of the main balance part 9 is ductile iron, and the conventional balance block is mostly high manganese steel or brass. Therefore, the material cost of the main balance part 9 is only 0.16-0.2 times of the conventional one, which greatly reduces the material cost of the compressor, that is, on the basis of reducing the material cost of parts, the vibration and noise of the whole machine are effectively improved.

[0032] In one embodiment, the eccentric portion 13 and the crankshaft 1 are of a split structure and are fixedly connected together. Compared with a conventional crankshaft, the eccentric portion 13 and the crankshaft 1 of the embodiment of the present application are of a split structure, and the two are fixedly connected by threads, which is convenient for replacement and maintenance of the eccentric portion 13, and can also facilitate the installation operation of the crankshaft 1, reducing the difficulty of installing the crankshaft 1.

[0033] In one embodiment, the area of ​​the first thrust surface is S1, the area of ​​the second thrust surface is S2, 0.6≤(S2 / S1)≤2, thereby increasing the crankshaft thrust area, improving the stability of the crankshaft operation, and reducing the overall vibration and noise of the miniaturized rotary fluid machinery.

[0034] In one embodiment, the axial depth of the first axial hole 10 is h3, the axial depth of the second axial hole 11 is h1, and the axial length of the second thrust portion 8 is h2, wherein h1, h2 and h3 satisfy 0≤h2-h1≤0.05mm, 0.05≤h1 / h3≤0.2, so that the ratio of the axial lengths of the first axial hole 10 and the second axial hole 11 can be reasonably set. Compared with conventional main bearings, this scheme increases the effective supporting length of the upper flange 7 to the long axis 15 of the crankshaft 1, optimizes the friction state between the friction pairs, effectively improves the axial trajectory of the crankshaft operation, reduces the friction power consumption between the upper flange 7 and the crankshaft 1, and improves the overall energy efficiency of the compressor.

[0035] See also Figures 1 to 5 As shown, according to an embodiment of the present application, the rotary fluid machinery includes a pump body structure, which is the above-mentioned pump body structure.

[0036] 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.

[0037] See also Figure 4 and Figure 5 , which is a comparison chart of the vibration acceleration and energy efficiency of the compressor of the embodiment of the present application and the compressor of the related art. Figure 4It can be seen that the vibration acceleration of the compressor using the embodiment of the present application is significantly lower than the vibration acceleration of the compressor in the related art, and is reduced by an average of 5m / s2. Figure 5 It can be seen that, compared with the compressor of the related art, in the compressor of the embodiment of the present application, the friction power consumption of the pump body is reduced, so that the energy efficiency of the whole machine is improved by about 5%, thereby effectively improving the working energy efficiency of the compressor.

[0038] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0039] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A pump body structure, It is characterized in that The crankshaft (1) comprises an upper flange (7), a cylinder (6), a lower flange (5) and a crankshaft (1), wherein the crankshaft (1) comprises an eccentric portion (13), a long shaft (15) and a short shaft (12), wherein the long shaft (15) and the short shaft (12) are located on both sides of the eccentric portion (13) in an axial direction, the long shaft (15) is rotationally matched with the upper flange (7), and the short shaft (12) is rotationally matched with the lower flange (5), and a first thrust portion (14) is provided on the lower side of the eccentric portion (13). The first thrust portion (14) has a first thrust surface that cooperates with the lower flange (5); the upper flange (7) has a first axial hole (10) and a second axial hole (11); the second axial hole (11) is located at the top of the first axial hole (10); the long shaft (15) is provided with a second thrust portion (8); the second thrust portion (8) is located in the second axial hole (11); the second thrust portion (8) has a second thrust surface that cooperates with the bottom surface of the second axial hole (11).

2. The pump body structure according to claim 1, It is characterized in that The crankshaft (1) is also provided with a main balancing portion (9), and the main balancing portion (9) is arranged on the upper side of the second thrust portion (8).

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

4. The pump structure according to claim 2, It is characterized in that The main balancing part (9) is made of ductile iron.

5. The pump structure according to any one of claims 2 to 4, It is characterized in that The main balance part (9) and the crankshaft (1) are an integrated structure.

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

7. The pump structure according to claim 1, It is characterized in that The area of ​​the first thrust surface is S1, the area of ​​the second thrust surface is S2, and 0.6≤(S2 / S1)≤2.

8. The pump structure according to claim 1, It is characterized in that The axial depth of the first axial hole (10) is h3, the axial depth of the second axial hole (11) is h1, and the axial length of the second thrust portion (8) is h2, wherein h1, h2 and h3 satisfy 0≤h2-h1≤0.05mm, 0.05≤h1 / h3≤0.

2.

9. A rotary fluid machine, comprising a pump body structure, It is characterized in that The pump body structure is the pump body structure according to any one of claims 1 to 8.

10. The rotary fluid machine according to claim 9, It is characterized in that The rotary fluid machinery is one of a rotary compressor and a rotary expander.

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