Crankshaft balancing structure of piston compressor
By connecting a regular balancing flywheel to the upper end of the crankshaft stub of the piston compressor, the problem of insufficient dynamic balance of the traditional piston compressor at different speeds is solved, more stable crankshaft rotation is achieved, and vibration is reduced.
Patent Information
- Application Number
- CN202423306201.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Traditional piston compressors cannot achieve optimal dynamic balance at different speeds, resulting in vibration problems.
A balance flywheel with a regular structure is connected to the upper end of the crankshaft short axis to utilize its fixed axis and inertia to ensure that the crankshaft rotates more smoothly. By aligning the central axis of the balance flywheel with the central axis of the crankshaft long axis, the impact of speed changes is reduced.
It effectively reduces the vibration of the compressor at different speeds and improves the rotation stability of the crankshaft.
Smart Images
Figure CN223447453U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a compressor technical field, concretely is a crankshaft balance structure of piston compressor. BACKGROUND
[0002] In the piston refrigeration compressor, the refrigerant gas is compressed by the reciprocating motion of the piston in the cylinder, so that the refrigerant continuously circulates in the system, thereby realizing the refrigeration effect. When the piston refrigeration compressor is working, the crankshaft long shaft is rotated along the central axis of the crankshaft long shaft driven by the motor rotor, at this time the connecting rod connected with the crankshaft short shaft converts the rotary motion of the crankshaft into the reciprocating motion of the piston, thereby realizing the compression of the refrigerant. Among them, the balance disc of the crankshaft is arranged between the crankshaft long shaft and the crankshaft short shaft to balance the rotation of the crankshaft short shaft, so that the center of mass of the rotary motion is infinitely close to the rotation center line of the crankshaft long shaft, and the dynamic balance of the whole crankshaft is ensured.
[0003] But because the pressure in the cylinder is not always consistent when the compressor is running, that is, the load is changing all the time, the speed of the crankshaft rotation is also changing all the time, and the change of the speed is too fast, which will cause the vibration of the compressor. The traditional way of balancing the crankshaft motion by using the balance disc cannot meet the requirements of high speed and low speed of the compressor at the same time, so the dynamic balance of the whole crankshaft cannot reach the best point, thereby causing the vibration of the compressor at different speeds. UTILITY MODEL CONTENTS
[0004] The utility model discloses a kind of crankshaft balance structure of piston compressor, by connecting balance flywheel on the upper end of crankshaft short shaft, utilize the fixed shaft and inertia of balance flywheel in the process of rotation, reduce the influence brought by the change of crankshaft speed too fast, make the rotation of crankshaft more stable, thereby reduce the vibration of compressor.
[0005] To achieve the above object, the technical scheme adopted by the utility model is as follows:
[0006] A kind of crankshaft balance structure of piston compressor, including crankshaft, the crankshaft includes crankshaft long shaft, balance disc and crankshaft short shaft connected in turn from bottom to top, the upper end of the crankshaft short shaft is connected with the balance flywheel of regular structure, the central axis of the balance flywheel is coaxially arranged with the central axis of the crankshaft long shaft.
[0007] In the above technical scheme, by connecting the balance flywheel on the upper end of the crankshaft short shaft, since the balance flywheel is of regular structure, it has fixed shaft when rotating, and when the compressor vibrates due to the change of crankshaft speed being too large, by coaxially arranging the central axis of the balance flywheel with the central axis of the crankshaft long shaft, the fixed shaft and inertia of the balance flywheel are utilized to reduce the influence brought by the change of crankshaft speed being too fast, so that the rotation of the crankshaft is more stable, thereby reducing the vibration of the compressor.
[0008] Further, the balance flywheel is a disc, a square disc, a regular polygon disc or a gear disc with teeth uniformly distributed on the circumference. The balance flywheel is arranged in a regular symmetrical structure, so that the rotation center of the balance flywheel is on the same straight line as the central axis, the balance flywheel is guaranteed to be fixed on the shaft, the rotation of the crankshaft is more stable, and the vibration of the compressor is reduced.
[0009] Further, the upper end of the short shaft of the crankshaft is provided with a convex part, the balance flywheel is provided with a mounting hole, and the convex part is connected with the mounting hole in interference fit. The convex part and the mounting hole are connected in interference fit, so that the balance flywheel and the short shaft of the crankshaft are connected.
[0010] Further, a notch is arranged on the convex part, and the notch is matched with the mounting hole. The notch avoids rotation of the balance flywheel during rotation.
[0011] Further, the thickness of the thinnest part of the balance flywheel is 0.5mm-10mm. By controlling the distance between the mounting hole and the edge, the strength of the connection structure of the balance flywheel and the short shaft of the crankshaft is guaranteed, and damage of the balance flywheel during high-speed rotation is avoided.
[0012] Further, the thickness of the balance flywheel is not greater than 30mm. By controlling the thickness of the balance flywheel, the influence of the mass of the balance flywheel on the rotation of the crankshaft is avoided.
[0013] Further, the farthest distance from the edge of the center of the balance flywheel is not greater than 50mm. By controlling the distance, the size of the balance flywheel is controlled, and the influence of the balance flywheel on the installation of the crankshaft is avoided.
[0014] Further, the distance between the lower surface of the balance flywheel and the upper surface of the balance disc is 5mm-80mm. The short sleeve of the crankshaft needs to be connected to a connecting rod, so as to control the movement of the piston through the connecting rod. The distance provides installation space for the connecting rod.
[0015] Compared with the prior art, the utility model has the advantages that:
[0016] 1. By arranging the central axis of the balance flywheel to coincide with the central axis of the long shaft of the crankshaft, the rotation of the crankshaft is more stable by using the fixed shaft property and inertia of the balance flywheel, the influence of too fast change of the rotation speed of the crankshaft is reduced, and the vibration of the compressor is reduced.
[0017] 2. The convex part and the mounting hole are connected in interference fit, so that the balance flywheel and the short shaft of the crankshaft are connected.
[0018] 3. By controlling the distance between the mounting hole and the edge, the strength of the balance flywheel and the short shaft connecting structure of the crankshaft is ensured, and damage of the balance flywheel in high-speed rotation is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a structural schematic view of the crankshaft balance structure of the piston compressor of the utility model;
[0020] Figure 2 It is a crankshaft structural schematic view of the crankshaft balance structure of the piston compressor of the utility model;
[0021] Figure 3 It is a working schematic view of the crankshaft balance structure of the piston compressor of the utility model.
[0022] In the drawing: 1, crankshaft long shaft; 2, balance disc; 3, crankshaft short shaft; 301, convex part; 4, balance flywheel; 401, mounting hole; 5, connecting rod; 6, piston. DETAILED DESCRIPTION
[0023] The technical scheme of the utility model will be described clearly and completely in combination with the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.
[0024] In the description of the utility model, it should be explained that the directions or position relations indicated by the terms "middle", "upper", "lower", "left", "right", "inner", "outer" and the like are the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the devices or elements indicated must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.
[0025] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0026] The specific embodiments of the utility model will be described below in combination with Figures 1 to 3The crankshaft balance structure of the piston compressor is described in detail through specific embodiments and application scenarios.
[0027] A crankshaft balance structure 4 of a piston compressor, comprising a crankshaft, the crankshaft comprising a crankshaft long shaft 1, an upper end of the crankshaft long shaft 1 being connected with a balance disc 2, an upper end of the balance disc 2 being connected with a crankshaft short shaft 3 arranged in a deviated manner with a central shaft of the crankshaft long shaft 1, and an upper end of the crankshaft short shaft 3 being connected with a regular balance flywheel 4, and a central axis of the balance flywheel 4 being coaxially arranged with a central axis of the crankshaft long shaft 1.
[0028] Specifically, the balance flywheel 4 is connected to the upper end of the crankshaft short shaft 3, and the balance flywheel 4 has a fixed shaft property due to a regular structure, and when the compressor vibrates due to a too large change in the rotation speed of the crankshaft, the axis of the balance flywheel 4 is arranged coaxially with the central axis of the crankshaft long shaft 1, and the fixed shaft property and inertia of the balance flywheel 4 are utilized to reduce the influence of the too fast change in the rotation speed of the crankshaft, so that the rotation of the crankshaft is more stable, thereby reducing the vibration of the compressor.
[0029] Further, as shown in Figure 1 , the balance flywheel 4 can be a disc, a square disc, a regular polygon disc or a gear disc uniformly distributed in a circle, and in the embodiment, the balance flywheel 4 is a disc, the balance flywheel 4 is arranged in a regular symmetrical structure, the rotation center of the balance flywheel 4 is arranged on the same straight line as the central axis, the fixed shaft property of the balance flywheel 4 is ensured, the rotation of the crankshaft is more stable, and the vibration of the compressor is further reduced.
[0030] Further, as shown in Figure 1 and Figure 2 , the upper end of the crankshaft short shaft 3 is provided with a convex part 301, the balance flywheel 4 is provided with a mounting hole 401 matched with the convex part 301, the balance flywheel 4 is connected with the crankshaft short shaft 3 through interference fit connection of the convex part 301 and the mounting hole 401, and after the balance flywheel 4 is connected with the crankshaft short shaft 3, the central axis of the balance flywheel 4 is arranged on the same straight line as the central axis of the crankshaft long shaft 1.
[0031] Further, as shown in Figure 1 , the convex part 301 is provided with a notch, and the notch is matched with the mounting hole, and in the embodiment, the notch makes the convex part 301 in a D shape, and the notch avoids rotation of the balance flywheel during rotation.
[0032] Further, as shown in Figure 1 , the thickness of the thinnest part of the mounting hole 401 is 0.5mm-10mm, and preferably, the distance is 5mm. By controlling the distance between the mounting hole 401 and the outer edge of the balance flywheel, the strength of the connection structure of the balance flywheel 4 and the crankshaft short shaft 3 is ensured, and damage of the balance flywheel 4 during high-speed rotation is avoided.
[0033] Further, as shown in Figure 1 the thickness of the balance flywheel 4 is not more than 30mm, preferably, the thickness is 5mm. By controlling the thickness of the balance flywheel 4, the mass of the balance flywheel 4 is avoided to be too heavy to affect the rotation of the crankshaft.
[0034] Further, as shown in Figure 1 the farthest distance from the outer edge of the center of the balance flywheel 4 is not more than 50mm, preferably, the distance is 20mm. In the embodiment, the balance flywheel 4 is a disc, the radius of the disc is 20mm, by controlling the distance to control the size of the balance flywheel 4, the balance flywheel 4 is avoided to be too large to affect the installation of the crankshaft.
[0035] Further, as shown in Figure 3 the distance from the lower surface of the balance flywheel 4 to the upper surface of the balance disc 2 is 5mm-80mm, preferably, is 16mm, since the crankshaft short shaft 3 needs to be connected to the connecting rod 5 to control the movement of the piston 6 through the connecting rod 5, the distance is controlled to leave installation space for the connecting rod 5.
[0036] It should be noted that the working principle of the utility model, since the regular balance flywheel 4 rotates stably around the central axis, the direction and position of the central axis as the rotation axis do not change in rotation, that is, the balance flywheel has a fixed axis.
[0037] When the balance flywheel 4 is connected to the upper end of the crankshaft short shaft 3, it is at the highest position of the compressor pump body, and the deflection angle is the largest. When the compressor is running, the balance flywheel 4 rotates at high speed. Due to the fixed axis of the balance flywheel 4, the original movement axis is maintained as much as possible during rotation. However, the rotation axis of the crankshaft may be deflected due to vibration during the operation of the compressor. At this time, the fixed axis of the balance flywheel 4 can inhibit the deflection of the rotation axis of the crankshaft, so that the crankshaft rotates more stably, thereby reducing the vibration of the compressor.
[0038] In addition, the load of the compressor changes at any time during operation, so that the rotation speed of the crankshaft also changes at any time. Since the balance flywheel 4 has inertia during rotation, the change in the rotation speed of the crankshaft is relatively stable, which further reduces the vibration of the compressor caused by the excessive change in the rotation speed of the crankshaft.
[0039] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A crankshaft balancing structure for a piston compressor, characterized in that: The crankshaft comprises a crankshaft long axis (1), the upper end of the crankshaft long axis (1) is connected to a balancing plate (2), the upper end of the balancing plate (2) is connected to a crankshaft short axis (3) arranged eccentrically with respect to the central axis of the crankshaft long axis (1), the upper end of the crankshaft short axis (3) is connected to a balancing flywheel (4) with a regular structure, and the central axis of the balancing flywheel (4) is coaxially arranged with the central axis of the crankshaft long axis (1).
2. The crankshaft balancing structure of a piston compressor according to claim 1, characterized in that: The balancing flywheel (4) is a circular disk, a square disk, a regular polygonal disk, or a gear disk evenly distributed on the circumference.
3. The crankshaft balancing structure of a piston compressor according to claim 1, characterized in that: A convex portion (301) is provided at the upper end of the crankshaft stub (3), a mounting hole (401) is provided on the balancing flywheel (4), and the convex portion (301) is connected to the mounting hole (401) by interference fit.
4. The crankshaft balancing structure of a piston compressor according to claim 3, characterized in that: The convex portion (301) is provided with a notch, and the notch is adapted to fit the mounting hole (401).
5. The crankshaft balancing structure of a piston compressor according to claim 1, characterized in that: The thickness of the thinnest part of the balancing flywheel (4) is 0.5 mm to 10 mm.
6. The crankshaft balancing structure of a piston compressor according to claim 1, characterized in that: The thickness of the balancing flywheel (4) is no more than 30 mm.
7. The crankshaft balancing structure of a piston compressor according to claim 1, characterized in that: The maximum distance between the center of the balancing flywheel (4) and the edge is no more than 50 mm.
8. The crankshaft balancing structure of a piston compressor according to claim 1, characterized in that: The distance between the lower surface of the balancing flywheel (4) and the upper surface of the balancing disc (2) is 5 mm to 80 mm.