Air suction pipe assembly and parallel compressor system
By setting a raised structure in the flow-balancing section of the suction pipe assembly, the problem of uneven oil return in the parallel compressors is solved, the oil flow is evenly distributed, the compressors are prevented from lacking oil and wearing, the normal operation of the system is ensured, and costs are reduced.
Patent Information
- Application Number
- CN202422541885.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-21
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-21
AI Technical Summary
There is an oil return imbalance problem in the parallel compressor system, which leads to a difference in the compressor's oil discharge and oil return volume. Long-term operation may cause the compressor to lack oil, wear and burn.
A raised structure is provided in the flow-equalizing section of the intake pipe assembly. The raised structure is located on the pipe wall side facing the refrigerant flow. The oil flow is adjusted by the raised structure in the flow-equalizing section so that the oil flow is evenly distributed in the parallel intake pipes and returns to the compressor, thereby achieving oil return balance.
Through uniform oil flow distribution, the compressor is prevented from oil shortage and wear, the oil return of each compressor is ensured to be balanced, the normal operation of the parallel compressor system is guaranteed, and the production cost is reduced.
Smart Images
Figure CN223307117U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of compressor systems, and in particular to an air intake pipe assembly and a parallel compressor system. Background Art
[0002] Compressor parallel connection refers to a connection method in which two or more compressors are connected in parallel on the same rack, and the suction pipe, exhaust pipe and other system components are shared during operation. Figure 1 The piping connection diagram of compressors in parallel is shown.
[0003] However, the oil return imbalance of parallel compressors is an important factor restricting the development of parallel technology. Figure 2 The structure of the suction pipe of the parallel compressor system shown is a simple parallel connection relationship.
[0004] When operating in parallel, some of the lubricating oil discharged from the compressors cannot be smoothly returned to the compressors, resulting in a discrepancy between the oil discharge and oil return volumes. Over long periods of operation, this discrepancy can lead to oil starvation, wear, and even burnout of the compressors. Research has found that in cooling mode, oil return in the low-temperature, low-pressure area is the most detrimental area.
[0005] In summary, the oil return of the parallel compressors in the prior art is unbalanced. Utility Model Content
[0006] The embodiment of the present invention provides an air intake pipe assembly and a parallel compressor system to solve the problem of unbalanced oil return of parallel compressors in the prior art.
[0007] To achieve the above-mentioned purpose, the present invention provides an intake pipe assembly, including: a parallel intake pipe, wherein the multiple parallel intake pipes correspond to the intake ports of multiple compressors respectively; a main intake pipe, wherein the first end of the main intake pipe is connected to the multiple parallel intake pipes, and the main intake pipe has a turning point corresponding to the first end, and a flow balancing section is formed between the first end of the main intake pipe and the turning point; the pipe wall inside the flow balancing section has a first pipe wall side that flows in the direction of the refrigerant flowing out of the turning point, and a protruding structure is provided on the pipe wall inside the flow balancing section, and the protruding structure is located on the first pipe wall side.
[0008] Furthermore, there is one protruding structure, and the distance between the protruding structure and the first end is greater than or equal to the distance between the protruding structure and the turning point.
[0009] Furthermore, the bending angle of the bend is 80° to 100°.
[0010] Furthermore, the protrusion height of the protrusion structure does not exceed 1 / 3 of the inner diameter of the flow averaging section.
[0011] Furthermore, there are multiple protrusion structures, and the multiple protrusion structures are arranged at intervals along the flow direction of the refrigerant.
[0012] Furthermore, the flow-balancing section is a straight pipe section structure.
[0013] Furthermore, there are two parallel intake pipes, and the two parallel intake pipes are connected to the first end of the main intake pipe to form a three-way structure.
[0014] Furthermore, the protruding structure and the tube wall inside the flow-balancing section are an integrally formed structure.
[0015] Furthermore, the surface of the protruding structure is an arc-shaped surface, and a smooth transition is formed between the edge of the protruding structure and the surface of the first tube wall side.
[0016] According to another aspect of the present invention, a parallel compressor system is provided, comprising the above-mentioned suction pipe assembly.
[0017] The intake pipe assembly of the present invention adds a protruding structure in the flow balancing section, and the protruding structure is located on the side of the first tube wall. After the oil flows through the protruding structure on the side of the first tube wall facing the refrigerant direction, the oil adhered to the side of the first tube wall flows back to the middle of the flow balancing section. In this way, the flow balancing section and the protruding structure have a flow balancing effect.
[0018] After the parallel compressor system is started, when the refrigerant and lubricating oil pass through the main suction pipe, after passing through the equalizing section, the oil flow can return to the middle of the pipe section, forming a uniform oil flow, so that the oil flow can evenly enter the parallel suction pipe and return to the parallel compressors, so that the compressors will not be short of oil, thus preventing the compressors from wearing out due to lack of oil, and ensuring that each compressor in the parallel compressors can ensure oil return balance, so that the entire system can operate normally. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a pipe connection diagram of compressors in parallel in the prior art;
[0020] Figure 2 It is a structural diagram of the suction pipe in the prior art;
[0021] Figure 3 It is the oil flow density distribution diagram of the suction pipe in the prior art;
[0022] Figure 4 This is a schematic structural diagram of an air intake pipe assembly according to an embodiment of the present invention;
[0023] Figure 5 3. It is the oil flow density distribution diagram of the intake pipe assembly according to the embodiment of the present utility model.
[0024] Description of reference numerals:
[0025] 10. Parallel suction pipe;
[0026] 20. Main intake pipe;
[0027] 21. First end;
[0028] 22. Turning point;
[0029] 23. Current sharing section;
[0030] 23a, first tube wall side;
[0031] 30. Raised structure. DETAILED DESCRIPTION
[0032] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the present invention.
[0033] After research and analysis, the applicant found that the oil flow in the suction pipe of the prior art is uneven. Figure 3 When the refrigerant and lubricating oil return to the compressor from the suction pipe, most of the lubricating oil in the vertical section of the suction elbow adheres to the pipe wall, forming an annular flow rather than a mist flow. At the bend in the main suction pipe, the streamlines of the two-phase flow (refrigerant flow and oil flow) are biased toward the far wall. This indicates that the lubricating oil is subjected to centrifugal force and adheres to the far wall, resulting in uneven oil return in the compressor suction pipe. Therefore, solving the oil return problem in this pipe section is the key to ensuring the normal operation of the parallel system.
[0034] Based on the above research and analysis, according to the embodiment of the present invention, an air intake pipe assembly is provided, see Figure 4 and Figure 5 As shown, the suction pipe assembly is used in a parallel compressor system. The suction pipe assembly includes multiple parallel suction pipes 10 and a main suction pipe 20. Refrigerant and oil flow back from the main suction pipe to the suction port of the compressor. The multiple parallel suction pipes 10 correspond to the suction ports of multiple compressors respectively; the first end 21 of the main suction pipe 20 is connected to the multiple parallel suction pipes 10, and the main suction pipe 20 has a bend 22 corresponding to the first end 21. A flow-equalizing section 23 is formed between the first end 21 of the main suction pipe 20 and the bend 22; the pipe wall inside the flow-equalizing section 23 has a first pipe wall side 23a that flows in the direction of the refrigerant flowing out of the bend 22, and a protruding structure 30 is provided on the pipe wall inside the flow-equalizing section 23. The protruding structure 30 is located on the first pipe wall side 23a.
[0035] The suction pipe assembly of the present invention adds a raised structure 30 in the flow balancing section 23. The raised structure is located on the first tube wall side 23a. After the oil flows through the raised structure 30 on the first tube wall side 23a facing the refrigerant direction, the oil adhered to the first tube wall side 23a flows back to the middle of the flow balancing section 23. In this way, the flow balancing section 23 and the raised structure 30 have a flow balancing effect. After the parallel compressor system is started, when the refrigerant and lubricating oil pass through the main suction pipe, after passing through the flow balancing section, the oil flow can return to the middle of the pipe section, forming a uniform oil flow, so that the oil flow can be evenly distributed into the parallel suction pipes 10 and returned to the parallel compressors, so that the compressors will not be worn due to lack of oil, and the oil return balance of each compressor in the parallel compressors can be guaranteed, so that the entire system can operate normally.
[0036] See also Figure 5 As shown, it can be clearly seen that the oil flow after passing through the convex structure returns to the middle of the pipe section and can also evenly enter the parallel intake pipe 10 at the first end of the main intake pipe 10. It can be seen that the intake pipe assembly provided by the present invention can fully achieve the technical effect of equal flow.
[0037] It should be noted that the first tube wall side 23a is the far wall side of the main intake duct bend, with the streamlines of the two-phase flow (refrigerant flow and oil flow) deviating toward it. The second tube wall side (not shown) opposite the first tube wall side is connected to the inner curved wall of the bend, while the first tube wall side is connected to the outer curved wall of the bend.
[0038] In this embodiment, there is one protruding structure 30 , and the distance between the protruding structure 30 and the first end 21 is greater than or equal to the distance between the protruding structure 30 and the turning point 22 .
[0039] The above arrangement of the protruding structure 30 ensures that the protruding structure 30 is at a certain distance from the first end 21, ensuring that the oil flow passing through the protruding structure 30 enters the parallel intake pipe after sufficient adjustment and equalization, thereby ensuring the oil equalization effect.
[0040] To ensure that the protrusion structure 30 is well aligned with the direction of the refrigerant flowing out of the bend, in this embodiment, the bend angle of the bend 22 is 80° to 100°, preferably 90°. This allows the refrigerant and lubricating oil flowing out of the bend 22 to adhere to the first tube wall in advance and then be adjusted by the protrusion structure 30, thereby improving the flow balance.
[0041] Preferably, see Figure 4 The protrusion height of the protrusion structure 30 does not exceed 1 / 3 of the inner diameter of the flow balancing section 23.
[0042] The protrusion height of the protrusion structure 30 cannot be too high to avoid the flow channel formed between the protrusion structure 30 and the inner wall of the flow balancing section 23 being too narrow, to avoid new flow influences caused by the narrow flow channel, and to ensure the stability of the flow balancing effect.
[0043] In this embodiment, the flow-balancing section 23 is a straight pipe structure. This structure allows for the rapid introduction of balanced refrigerant and oil flows into the parallel intake pipes, ensuring efficient oil return. The straight pipe structure also offers lower production costs.
[0044] Preferably, there are two parallel air intake pipes 10 , and the two parallel air intake pipes 10 are connected to the first end 21 of the main air intake pipe 20 to form a three-way structure.
[0045] In this embodiment, two parallel suction pipes are provided for the two parallel compressors. Through the distribution of the three-way structure, the best oil equalization effect is achieved for the two parallel compressors, ensuring oil return balance.
[0046] Considering the production cost, the protrusion structure 30 is formed as an integral structure with the tube wall inside the flow balancing section 23. The integrally formed protrusion structure can reduce the cost of raw materials.
[0047] Preferably, the surface of the protruding structure 30 is an arc-shaped surface, and a smooth transition is formed between the edge of the protruding structure 30 and the surface of the first tube wall side 23a. The arc-shaped surface can be a semicircular arc.
[0048] The curved surface and smooth transition of the raised structure can make the flow of refrigerant and lubricating flow smoother, ensure the oil return efficiency and make the system operation more stable.
[0049] Existing intake pipe structures without a flow equalizer can lead to uneven oil return. Adding other electronic oil return equalizers increases both structural and overall machine costs. However, the intake pipe assembly provided by the present invention offers a simpler structure, easier design, and reduced raw material costs. The raised structure provides greater structural stability, significantly reducing production costs.
[0050] In an embodiment not shown in the figures, the present invention further provides another embodiment of an intake pipe assembly, in which there are multiple protrusion structures 30, and the multiple protrusion structures 30 are arranged at intervals along the refrigerant flow direction.
[0051] The multiple raised structures 30 can adjust and correct the oil flow multiple times, ensuring that the oil flow entering the parallel suction pipe is more balanced and ensuring the oil return balance of each parallel compressor.
[0052] The utility model also provides a parallel compressor system, comprising the above-mentioned suction pipe assembly.
[0053] After the parallel compressor system is started, when the refrigerant and lubricating oil pass through the main suction pipe, after passing through the equalizing section, the oil flow can return to the middle of the pipe section, forming a uniform oil flow, so that the oil flow can evenly enter the parallel suction pipe and return to the parallel compressors, so that the compressors will not be short of oil, thus preventing the compressors from wearing out due to lack of oil, and ensuring that each compressor in the parallel compressors can ensure oil return balance, so that the entire system can operate normally.
[0054] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.
[0055] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.
[0056] Of course, the above are preferred embodiments of the present invention. It should be noted that, for those skilled in the art, without departing from the basic principles of the present invention, several improvements and modifications can be made, and these improvements and modifications are also considered to be within the scope of protection of the present invention.
Claims
1. An air intake pipe assembly, characterized in that: include: Parallel suction pipes (10), wherein the plurality of parallel suction pipes (10) correspond to and are connected to the suction ports of the plurality of compressors; A main air intake pipe (20), wherein a first end (21) of the main air intake pipe (20) is in communication with the plurality of parallel air intake pipes (10), the main air intake pipe (20) has a bend (22) corresponding to the first end (21), and a flow balancing section (23) is formed between the first end (21) of the main air intake pipe (20) and the bend (22); The tube wall inside the flow-evening section (23) has a first tube wall side (23a) facing the direction of the refrigerant flowing out of the bend (22), and a protruding structure (30) is provided on the tube wall inside the flow-evening section (23), and the protruding structure (30) is located on the first tube wall side (23a).
2. The air intake duct assembly according to claim 1, wherein: There is one protruding structure (30), and the distance between the protruding structure (30) and the first end (21) is greater than or equal to the distance between the protruding structure (30) and the turning point (22).
3. The air intake duct assembly according to claim 1, wherein: The bending angle of the turning point (22) is 80° to 100°.
4. The air intake duct assembly according to claim 1, wherein The protrusion height of the protrusion structure (30) does not exceed 1 / 3 of the inner diameter of the flow averaging section (23).
5. The air intake duct assembly according to claim 1, wherein: There are multiple protrusion structures (30), and the multiple protrusion structures (30) are arranged at intervals along the flow direction of the refrigerant.
6. The air intake duct assembly according to claim 1, wherein: The flow-averaging section (23) is a straight pipe section structure.
7. The air intake duct assembly according to claim 1, wherein: There are two parallel air intake pipes (10), and the two parallel air intake pipes (10) are connected to the first end (21) of the main air intake pipe (20) to form a three-way structure.
8. The air intake duct assembly according to claim 1, wherein: The protruding structure (30) and the tube wall inside the flow-balancing section (23) are an integrally formed structure.
9. The air intake duct assembly according to claim 1, wherein: The surface of the protruding structure (30) is an arc-shaped surface, and a smooth transition is formed between the edge of the protruding structure (30) and the surface of the first tube wall side (23a).
10. A parallel compressor system, characterized in that: The invention comprises the intake pipe assembly according to any one of claims 1 to 9.