Main machine of air supercharger for PET bottle blowing machine
By adopting a double-supported crankshaft structure and centripetal roller bearing in the air booster for PET bottle blowing machine, combined with the balance block and connecting rod design, the problems of high vibration and high noise under high pressure are solved, and the high-pressure air boosting effect with low vibration, low noise and long life are achieved.
Patent Information
- Application Number
- CN202422381719.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The crankshaft of the air booster used in PET bottle blowing machine is subjected to a large bending moment under high pressure, resulting in large vibration, short bearing life and high noise, which will cause damage to the crankshaft and crankcase in severe cases.
It adopts a dual-supported crankshaft structure and centripetal roller bearing, through the design of balanced blocks and connecting rods, it increases dynamic load capacity, reduces vibration and noise, and improves the overall structural compactness and exhaust volume through specific cylinder layout and angle design.
It realizes a low vibration, low noise, low energy consumption and long life air booster, which can operate stably under high pressure and has an exhaust pressure of 4MPa.
Smart Images
Figure CN222910203U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of air boosters, in particular to a mainframe of a high-pressure air compressor for a PET bottle blowing machine. Background Art
[0002] The exhaust pressure (gauge pressure) of a small air compressor is generally not higher than 1MPa, and the crankshaft in its main engine generally adopts a single support structure, that is, one end of the crank is supported on the crankcase by a common bearing. However, for the air booster used in the PET bottle blowing machine, the exhaust pressure must reach 4MPa, and the bending moment of the crankshaft is very large. If the traditional single support structure is used, the crankshaft and the whole machine will vibrate greatly, the bearing life will be short, and the whole machine will be very noisy, which will seriously damage the crankshaft and crankcase. Summary of the invention
[0003] The utility model provides a mainframe of an air booster for a PET bottle blowing machine, which has a reasonable structural design, small vibration, low energy consumption, low noise, long working life and high exhaust pressure.
[0004] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:
[0005] A main engine of an air booster for a PET bottle blowing machine comprises a crankshaft, a crankcase, at least one connecting rod, at least one cylinder and at least one air valve. The crankshaft is rotatably supported on the crankcase, the lower end of each connecting rod is sleeved on a crank of the crankshaft, the upper end of each connecting rod extends into a cylinder fixed on the crankcase, an air valve is arranged on the top of each cylinder, the crankshaft has only one crank, and both ends of the crankshaft are rotatably supported on the two side walls of the crankcase through spherical roller bearings.
[0006] The main engine of the air booster for the above-mentioned PET bottle blowing machine has two balancing blocks integrated with the crankshaft on both sides of the crank. The side of the balancing block facing away from the crank extends away from the distal axis of the crankshaft rotation axis toward both ends of the crankshaft, so that the side of the balancing block facing away from the crank forms a step shape.
[0007] The main engine of the air booster for the PET bottle blowing machine mentioned above has two relatively fitted half rings at the lower end of the connecting rod, and the fitting surfaces of the two half rings are provided with matching serrations; the two half rings are provided with bolt holes perpendicular to the fitting surfaces, and the bolts passing through the bolt holes connect the two half rings.
[0008] The main engine of the air booster for the PET bottle blowing machine has two cylinders, the angle between the two cylinders in the circumferential direction around the crankshaft rotation axis is 80-100 degrees, and the two cylinders are arranged at intervals in the direction of the crankshaft rotation axis.
[0009] The main engine of the air booster for the PET bottle blowing machine has three cylinders, the angle between two adjacent cylinders in the circumferential direction around the crankshaft rotation axis is 50-70 degrees, and the three cylinders are arranged at intervals in the direction of the crankshaft rotation axis.
[0010] The main engine of the air booster for the PET bottle blowing machine has four cylinders, the angle between two adjacent cylinders in the circumferential direction around the crankshaft rotation axis is 40-50 degrees, and the four cylinders are arranged at intervals in the direction of the crankshaft rotation axis.
[0011] The beneficial effects of the utility model are:
[0012] The utility model adopts a double-support crankshaft structure and a spherical roller bearing, which doubles the dynamic load, reduces vibration to 7-12mm / s, has low friction power consumption, long life, vibration reduction and noise reduction, and the exhaust pressure can reach 4MPa. A single-crank crankshaft is used for easy processing. The spherical roller bearing has double-row rollers, a common spherical raceway on the outer ring, and two raceways on the inner ring that are inclined at an angle relative to the bearing axis. This ingenious structure gives it an automatic self-aligning performance, and is therefore not easily affected by the angle error between the crankshaft and the crankcase or the bending of the crankshaft. In addition to being able to withstand radial loads, the bearing can also withstand bidirectional axial loads.
[0013] The side of the balancing block facing away from the crank forms a step shape, and the distal axis portion of the balancing block facing away from the crank extends toward both ends of the crankshaft. Under the premise of ensuring the weight of the balancing block, the size of the crankcase in the radial direction of the crankshaft is reduced. At the same time, the distal axis portion protrudes from the side and will not interfere with the bearing seat where the bearing is set on the crankcase.
[0014] Two fitted half rings with serrations form the lower end (big end) of the connecting rod. When the two half rings are connected by bolts, the half rings will basically not deform radially or the radial deformation of the half rings is reduced under the action of the meshing serrations, thereby ensuring the matching accuracy of the connecting rod big end and the crank, and also reducing the processing accuracy of the bolt hole.
[0015] When the number of cylinders is 1, 2, 3, or 4, adjacent cylinders adopt a specific angle in the circumferential direction, with a compact structure and beautiful appearance. The displacement is generally 2-3, 3-5, 6-8, or 10-12m 3 / min (670rpm), achieving serialization and modularization. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a front view of the air booster of Example 1.
[0017] Figure 2 This is a side view of the air booster of Example 1.
[0018] Figure 3This is the front view of the crankshaft.
[0019] Figure 4 A side view of the crankshaft.
[0020] Figure 5 This is the front view of the connecting rod.
[0021] Figure 6 A top view of the connecting rod.
[0022] Figure 7 middle Figure 5 A partial enlarged view of the .
[0023] Figure 8 This is a front view of the air booster of Example 2.
[0024] Fig. 9 This is a side view of the air booster of Example 2.
[0025] Fig.10 This is a front view of the air booster of Example 3.
[0026] Fig.11 This is a side view of the air booster of Example 3.
[0027] Fig.12 This is a front view of the air booster of Example 4.
[0028] Fig.13 This is a side view of the air booster of Example 4. DETAILED DESCRIPTION
[0029] The specific implementation of the utility model is further described below according to the accompanying drawings:
[0030] Embodiment 1 (w series):
[0031] A main engine of an air booster for a PET bottle blowing machine comprises a crankshaft 1 having only one crank 13, a crankcase 2, three connecting rods 3, three cylinders 4, and three air valves 5. The lower end of each connecting rod is sleeved on the crank of the crankshaft, the upper end of each connecting rod extends into a cylinder fixed on the crankcase and is hinged with a piston 6, an air valve is arranged on the top of each cylinder, and the two ends of the crankshaft 1 are rotatably supported on the two side walls of the crankcase through spherical roller bearings 7.
[0032] There are two balancing blocks 11 integrated with the crankshaft on both sides of the crank. The distal part 12 of the balancing block away from the crankshaft rotation axis extends toward both ends of the crankshaft, so that the balancing block away from the crankshaft side forms a step shape.
[0033] The lower end of the connecting rod 3 includes two relatively fitted half rings 31, and the fitting surfaces of the two half rings are provided with matching serrations 32; the two half rings are provided with bolt holes 33 perpendicular to the fitting surfaces, and the bolts passing through the bolt holes connect the two half rings.
[0034] The angle between the two cylinders in the circumferential direction with the crankshaft rotation axis as the center is 60°, and the cylinders are arranged at intervals in the direction of the crankshaft rotation axis.
[0035] Embodiment 2 (s series):
[0036] The main difference between it and the first embodiment is that there are four cylinders 4, four connecting rods 3, etc., and the angle between two adjacent cylinders in the circumferential direction with the crankshaft rotation axis as the center is 45°.
[0037] Embodiment 3 (v series):
[0038] The main difference between it and the first embodiment is that there are two cylinders 4, two connecting rods 3, etc., and the angle between two adjacent cylinders in the circumferential direction with the crankshaft rotation axis as the center is 90°.
[0039] Embodiment 4 (z series):
[0040] The main difference between it and embodiment 1 is that there is one cylinder 4, one connecting rod 3, etc.
[0041] The utility model has the following advantages:
[0042] The crankshaft uses special bearings with super load capacity, low friction power consumption and long life. Displacement 2-12M 3. min / 4.0Mpa, 670rpm. Simple structure, stable performance, easy maintenance. Compared with traditional air compressors, fuel consumption is reduced by 50%, noise is reduced by 15%, exhaust volume is increased by 5%, energy consumption is reduced by 10%, and working life is increased by 500%.
[0043] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope of the claims.
Claims
1. A main engine of an air booster for a PET bottle blowing machine, comprising a crankshaft, a crankcase, at least one connecting rod, at least one cylinder, and at least one air valve, wherein the crankshaft is rotatably supported on the crankcase, the lower end of each connecting rod is sleeved on the crank of the crankshaft, the upper end of each connecting rod extends into a cylinder fixed on the crankcase, and an air valve is arranged on the top of each cylinder, characterized in that: The crankshaft has only one crank, and both ends of the crankshaft are rotatably supported on the two side walls of the crankcase through spherical roller bearings.
2. The main machine of the air booster for the PET bottle blowing machine according to claim 1, characterized in that: There are two balancing blocks integrated with the crankshaft on both sides of the crank. The balancing blocks extend toward both ends of the crankshaft from the distal axis of the crankshaft's rotation axis on the side away from the crank, so that the balancing blocks form a step shape on the side away from the crank.
3. The main machine of the air booster for the PET bottle blowing machine according to claim 1, characterized in that: The lower end of the connecting rod includes two relatively fitted half rings, the fitting surfaces of the two half rings are provided with matching serrations; the two half rings are provided with bolt holes perpendicular to the fitting surfaces, and the bolts passing through the bolt holes connect the two half rings.
4. The main machine of the air booster for the PET bottle blowing machine according to claim 1, characterized in that: There are two cylinders, and the angle between the two cylinders in the circumferential direction centered on the crankshaft rotation axis is 80-100 degrees, and the two cylinders are arranged at intervals in the direction of the crankshaft rotation axis.
5. The main machine of the air booster for the PET bottle blowing machine according to claim 1, characterized in that: There are three cylinders, and the angle between two adjacent cylinders in the circumferential direction with the crankshaft rotation axis as the center is 50-70 degrees, and the three cylinders are arranged at intervals in the direction of the crankshaft rotation axis.
6. The main machine of the air booster for the PET bottle blowing machine according to claim 1, characterized in that: There are four cylinders, and the angle between two adjacent cylinders in the circumferential direction with the crankshaft rotation axis as the center is 40-50 degrees, and the four cylinders are arranged at intervals in the direction of the crankshaft rotation axis.