Piston compressor cylinder block with ball bearing arrangement
Patent Information
- Application Number
- CN202522401599.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-12
AI Technical Summary
Existing flange-structured cylinder seats with thrust ball bearing assemblies suffer from high frictional power consumption at high speeds, hindering improvements in compressor energy efficiency.
The design employs a ball bearing structure, including an annular scraper surface and ball bearings on the cylinder block, which replaces sliding friction with rolling friction to optimize the contact between the crankshaft and the cylinder block.
It reduces the frictional power consumption of the moving parts of the whole machine, improves the working efficiency and COP value of the compressor, and has a particularly significant effect in high speed and high efficiency scenarios.
Smart Images
Figure CN224931805U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of compressor cylinder seats, and more specifically, to a piston compressor cylinder seat with a ball bearing structure. Background Technology
[0002] In the core transmission system of a piston compressor, the cylinder block is a key component supporting the crankshaft and ensuring the stability of the moving parts. Its structural design directly determines the frictional power consumption between the crankshaft and the cylinder block, thus significantly affecting the overall energy efficiency of the compressor. Currently, the mainstream compressor cylinder blocks in the industry are mainly divided into two types: the first type is a flange structure cylinder block with a thrust ball bearing assembly (…). Figure 5 This structure, designed to optimize friction performance, typically integrates a thrust ball bearing assembly. Its core components include: an upper shim that mates with the crankshaft shoulder, a lower shim that mates with the cylinder block boss, and a steel ball cage assembly to reduce rolling friction. In actual operation, this type of structure effectively reduces crankshaft friction loss through the rolling action of the thrust ball bearing assembly. Therefore, its friction power consumption performance is significantly better than the other type of structure, and it is widely used in compressors with certain energy efficiency requirements. The second type is a scraper-type cylinder block without a thrust ball bearing assembly. Figure 6 This structure eliminates the thrust ball bearing assembly and achieves support directly through the cooperation between the scraper and the crankshaft. Although it has certain advantages in terms of cost and structural simplification, since the friction between the crankshaft and the scraper is mainly sliding friction, its friction power consumption is much higher than that of the flange structure with thrust ball bearing assembly. It is only suitable for scenarios with low energy efficiency requirements.
[0003] Although the flange structure with thrust ball bearing assembly has become the preferred solution in the existing technology, its inherent defects have gradually become prominent as compressors develop towards higher speed and higher efficiency: when the compressor crankshaft rotates at high speed, it will generate an axial load parallel to the shaft. At this time, there is still an insurmountable sliding friction between the upper and lower shims of the thrust ball bearing assembly and the steel ball cage. This frictional power consumption has become the core obstacle to further improving the energy efficiency of the compressor. Utility Model Content
[0004] To address the aforementioned technical problems in related technologies, this utility model provides a piston compressor cylinder seat with a ball bearing structure, which can solve the above problems.
[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A piston compressor cylinder seat with a ball bearing structure includes a cylinder seat body. An exhaust chamber is provided on one side of the upper end face of the cylinder seat body. A cylinder head is provided on one side of the cylinder seat body. Connecting posts are provided at the four corners of the lower end of the cylinder seat body. An installation groove is provided in the middle of the upper end face of the cylinder seat body. From top to bottom, the middle of the bottom of the installation groove is provided with an annular first scraping surface, an annular second scraping surface, and an annular third scraping surface. A circular first scraping hole is provided at the center of the first scraping surface. A ball bearing is installed in the first scraping hole. The lower bottom surface of the outer ring of the ball bearing contacts the second scraping surface. The lower bottom surface of the inner ring of the ball bearing is away from the second scraping surface and suspended directly above the third scraping surface. A crankshaft hole is provided at the center of the third scraping surface.
[0006] Furthermore, a root cleaning ring groove is provided at the bottom end of the first scraping table hole, and the root cleaning ring groove is located on the outer circle side of the second scraping table surface.
[0007] Furthermore, the second scraping surface has a circular second scraping hole at its center. The first scraping hole, the second scraping hole, and the crankshaft hole are concentrically arranged, and the diameter of the first scraping hole is larger than the diameter of the second scraping hole, and the diameter of the second scraping hole is larger than the diameter of the crankshaft hole.
[0008] Furthermore, a crankshaft is connected in the crankshaft hole, the upper end of the crankshaft is interference-fitted with the inner hole of the ball bearing, the middle end of the crankshaft is clearance-fitted with the crankshaft hole, and the lower end of the crankshaft is clearance-fitted with the crankshaft hole. The size range of the clearance-fitted first is 0 to 50 μm, and the size of the clearance-fitted second is not less than 0.2 mm.
[0009] Furthermore, the third scraping platform is connected to a flow guide hole.
[0010] The beneficial effects of this utility model are as follows: The cylinder seat of this application, through the design of a ball bearing structure, can reduce the frictional power consumption between moving parts of the whole machine, thereby improving the working efficiency of the whole machine. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0012] The present invention will now be described in further detail with reference to the accompanying drawings.
[0013] Figure 1This is a schematic diagram of the structure of a piston compressor cylinder seat with a ball bearing structure according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of the cylinder seat body according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the connection between the cylinder seat and crankshaft of a piston compressor with a ball bearing structure, as described in an embodiment of this utility model. Figure 4 This is a cross-sectional view of the connection between the cylinder seat body and the ball bearing as described in this embodiment of the utility model; Figure 5 This is a schematic diagram of the flange structure cylinder seat with thrust ball bearing assembly described in the background art; Figure 6 This is a schematic diagram of the structure of the scraper cylinder seat without thrust ball bearing assembly as described in the background art.
[0014] In the picture: 1. Cylinder seat body; 2. Exhaust chamber; 3. Cylinder head; 4. Connecting column; 5. First scraper surface; 6. Second scraper surface; 7. Third scraper surface; 8. Ball bearing; 9. Cleaning ring groove; 10. Crankshaft bore; 11. Guide hole. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.
[0016] like Figure 1-4 As shown, this utility model discloses a piston compressor cylinder seat with a ball bearing structure, including a cylinder seat body 1. An exhaust chamber 2 is provided on one side of the upper end face of the cylinder seat body 1, and a cylinder head 3 is provided on one side of the cylinder seat body 1. Connecting posts 4 are provided at the four corners of the lower end of the cylinder seat body 1. The cylinder seat body 1 is characterized by having a mounting groove in the middle of its upper end face. From top to bottom, the middle of the bottom of the mounting groove is provided with an annular first scraping surface 5, an annular second scraping surface 6, and an annular third scraping surface 7. The first scraping surface 5 has a circular first scraping hole at its center. A ball bearing 8 is installed in the first scraping hole. The lower bottom surface of the outer ring of the ball bearing 8 contacts the second scraping surface 6, and the lower bottom surface of the inner ring of the ball bearing 8 is away from the second scraping surface 6 and suspended directly above the third scraping surface 7. A crankshaft hole 10 is provided at the center of the third scraping surface 7.
[0017] In a specific embodiment of this application, such as Figure 2As shown, the cylinder seat shaft hole surface at the bottom of the mounting groove is designed with three scraping surfaces, namely the annular first scraping surface 5, the annular second scraping surface 6, and the annular third scraping surface 7, as shown. Figure 4 As shown, the ball bearing 8 is installed in the first scraping hole at the center of the first scraping surface 5 (either a sliding clearance fit or a fastening method can be used). The lower bottom surface of the outer ring of the ball bearing 8 is in surface contact with the second scraping surface 6. At the same time, a root-cleaning design is performed at the bottom end of the first scraping hole to form a root-cleaning ring groove 9, which can prevent stress concentration. The lower bottom surface of the inner ring of the ball bearing 8 is far away from the second scraping surface 6 and is suspended directly above the third scraping surface 7. That is, the lower bottom surface of the inner ring of the ball bearing 8 does not make surface contact with the second scraping surface 6, preventing frictional power loss between the inner ring of the ball bearing 8 and the scraping surface when rotating.
[0018] In a specific embodiment of this application, in order to further reduce the frictional power consumption between the crankshaft and the crankshaft bore 10, the bore diameter of the crankshaft bore 10 is designed such that the upper end of the crankshaft bore is designed as an ultra-large clearance fit (the crankshaft and the bore do not contact each other), and the lower end of the crankshaft bore is designed as a conventional clearance fit. That is, the upper end of the crankshaft is interference-fitted with the inner hole of the ball bearing 8, the middle end of the crankshaft is clearance fit one with the crankshaft bore 10, and the lower end of the crankshaft is clearance fit two with the crankshaft bore 10. The size range of clearance fit one is 0 to 50 μm, and the size of clearance fit two is not less than 0.2 mm.
[0019] In summary, the optimized cylinder block design reduces the overall frictional power consumption of the compressor, thereby improving its working efficiency and achieving a higher COP value. This solution is particularly effective for high-speed, high-efficiency compressors.
[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A piston compressor cylinder seat with a ball bearing structure, comprising a cylinder seat body (1), an exhaust chamber (2) provided on one side of the upper end face of the cylinder seat body (1), a cylinder head (3) provided on one side of the cylinder seat body (1), and connecting posts (4) provided at the four corners of the lower end of the cylinder seat body (1), characterized in that, The upper end face of the cylinder seat body (1) is provided with a mounting groove. The bottom end of the mounting groove is provided with an annular first scraping surface (5), an annular second scraping surface (6) and an annular third scraping surface (7) from top to bottom. The center of the first scraping surface (5) is provided with a circular first scraping hole. A ball bearing (8) is installed in the first scraping hole. The bottom surface of the outer ring of the ball bearing (8) is in contact with the second scraping surface (6). The bottom surface of the inner ring of the ball bearing (8) is far away from the second scraping surface (6) and is suspended directly above the third scraping surface (7). The center of the third scraping surface (7) is provided with a crankshaft hole (10).
2. The piston compressor cylinder seat with ball bearing structure according to claim 1, characterized in that, The bottom end of the first scraping table hole is provided with a root cleaning ring groove (9), which is located on the outer circle side of the second scraping table surface (6).
3. The piston compressor cylinder seat with ball bearing structure according to claim 1, characterized in that, The second scraping surface (6) has a circular second scraping hole at its center. The first scraping hole, the second scraping hole and the crankshaft hole (10) are concentrically arranged, and the diameter of the first scraping hole is greater than the diameter of the second scraping hole, and the diameter of the second scraping hole is greater than the diameter of the crankshaft hole (10).
4. A piston compressor cylinder seat with a ball bearing structure according to claim 1, characterized in that, A crankshaft is connected in the crankshaft hole (10). The upper end of the crankshaft is interference-fitted with the inner hole of the ball bearing (8). The middle end of the crankshaft is clearance-fitted with the crankshaft hole (10) and the lower end of the crankshaft is clearance-fitted with the crankshaft hole (10). The size range of the clearance-fitted first is 0 to 50 μm, and the size of the clearance-fitted second is not less than 0.2 mm.
5. A piston compressor cylinder seat with a ball bearing structure according to claim 1, characterized in that, The third scraping platform (7) is connected to a guide hole (11).