Double balance block crankshaft of air compressor

Abstract

The utility model discloses a double balance block crankshaft of air compressor, including crank body, the crank is sequentially provided with main journal, crank arm, connecting rod journal, crank and rear end shaft. The bottom of crank arm is boss structure, and the below detachably installed with left balance block, the below detachably installed with right balance block in the crank, wherein the contact surface of right balance block and crank is the camber surface, and the outer circle radius of right balance block is less than left balance block. A plurality of needle bearings are arranged on connecting rod journal, and interval copper sheets are arranged between the needle bearings, and connecting rods are installed on the needle bearings, and piston heads are connected to the top of connecting rods, and oil extraction needles are arranged at the bottom. The utility model discloses detachable double balance block structure, makes the big head of connecting rod can install needle bearing, compared with the traditional fixed double balance block, only open type bearing bush can be used, and the processing is more simple and convenient, right balance block is fixed on the crank through two inner hexagonal bolts, and after dismounting, the big head bearing inner ring of connecting rod can be directly installed on the crank, which is convenient for assembling and maintaining.

Description

Technical Field

[0001] This utility model relates to the field of crankshaft technology, and more specifically, to a dual-balanced-block crankshaft for an air compressor. Background Technology

[0002] Vibration control of reciprocating air compressors is crucial for improving their operational stability and reliability, and the design of the crankshaft balance block is of paramount importance. Traditional single balance block solutions require the addition of weights to the main rotor wheel, which has inherent drawbacks such as complex vibration calculations and difficulty in finely adjusting the balance. While detachable dual balance block designs can improve the balancing effect, they require the crankshaft to be machined with mounting bosses and necessitate a split structure for the connecting rod big end (i.e., cut and connected to the bearing shell by bolts), leading to complex processing technology, difficulty in precision control, high manufacturing costs, and challenges to connection reliability. Utility Model Content

[0003] The main objective of this invention is to provide a dual-balanced crankshaft for an air compressor, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A dual-balance-block crankshaft for an air compressor includes a crankshaft, wherein the crankshaft is sequentially provided with a main journal, a crank arm, a connecting rod journal, a crank crank, and a rear end shaft;

[0006] The bottom of the crank arm has a boss structure, and a detachable left balance weight is located below the boss structure. A detachable right balance weight is located below the crank.

[0007] Furthermore, the left and right balance blocks are fixed to the crankshaft by bolts. The mating surface of the right balance block in contact with the crank is a curved surface, and the outer radius of the right balance block is smaller than that of the left balance block.

[0008] Furthermore, multiple needle roller bearings are provided on the connecting rod journal, with spacer copper sheets between the needle roller bearings, and the connecting rod is provided on the needle roller bearings.

[0009] Furthermore, a piston head is provided at the top of the connecting rod, and an oil-pulling needle is provided at the bottom of the connecting rod.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] In this invention, a detachable double balance block design (left and right balance blocks) is adopted, which allows the connecting rod big end to be fitted with needle roller bearings. Compared with the traditional fixed double balance block, which can only use open bearing shells, this simplifies the processing technology and reduces the manufacturing difficulty. The right balance block is fixed to the crankshaft with bolts. After disassembly, space is made for the installation of the inner ring of the connecting rod big end bearing, allowing it to pass smoothly through the crank and be assembled onto the connecting rod journal, thereby greatly improving the convenience of assembly and maintenance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a double-balanced crankshaft and connecting rod of an air compressor according to an embodiment of the present invention;

[0013] Figure 2 This is a schematic diagram of the structure of a double-balance block crankshaft of an air compressor according to an embodiment of the present invention;

[0014] Figure 3 This is an exploded view of a dual-balance-block crankshaft of an air compressor according to an embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of a needle roller bearing structure for a dual-balance block crankshaft of an air compressor according to an embodiment of the present invention;

[0016] Figure 5 This is a schematic diagram of the spacer copper sheet structure of a double balance block crankshaft of an air compressor according to an embodiment of the present invention.

[0017] Figure 6 This is a schematic diagram of the connecting rod structure of a double-balance-block crankshaft in an air compressor according to an embodiment of this utility model. Explanation of the reference numerals in the diagram:

[0018] 1. Crankshaft; 2. Main journal; 3. Connecting rod journal; 31. Spacer plate; 4. Insert block; 5. Crank arm; 6. Left balance block; 7. Right balance block; 9. Connecting rod; 91. Needle roller bearing; 92. Oil puller needle; 93. Piston head. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0020] Example

[0021] like Figures 1-6As shown, a dual-balance-block crankshaft for an air compressor includes: a crankshaft 1, wherein the crankshaft 1 is sequentially provided with a main journal 2, a crank arm 5, a connecting rod journal 3, a crank 4, and a rear end shaft 8;

[0022] The bottom of the crank arm 5 is a boss structure, and a detachable left balance block 6 is provided below the boss structure. A detachable right balance block 7 is provided below the crank 4.

[0023] The left balance block 6 and the right balance block 7 are fixed to the crankshaft 1 by bolts. The mating surface of the right balance block 7 and the crank 4 is a curved surface. The outer radius of the right balance block 7 is smaller than the outer radius of the left balance block 6.

[0024] Multiple needle roller bearings 91 are provided on the connecting rod journal 3, and spacer copper plates 31 are provided between the needle roller bearings 91. The connecting rod 9 is provided on the needle roller bearings 91.

[0025] A piston head 93 is provided at the top of the connecting rod 9, and an oil-pulling needle 92 is provided at the bottom of the connecting rod 9.

[0026] Working principle:

[0027] When the crankshaft rotates, it drives the connecting rod and piston head, which are equipped with needle roller bearings, to reciprocate through the connecting rod journal. Simultaneously, the left balance weight, bolted to the bottom of the crank arm boss, and the right balance weight, located below the crank crank, work together to balance the unbalanced inertial forces and torques generated during crankshaft operation, effectively reducing vibration. The key improvement lies in the adoption of a detachable balance weight structure. In particular, the right balance weight is fixed with hexagonal socket head cap screws, allowing space to be made for the installation of the connecting rod big end bearing inner ring after disassembly. This enables convenient assembly and replacement of the needle roller bearing, solving the problems of traditional fixed balance weights that can only use open bearing shells and have complex machining requirements, and greatly improving the convenience of assembly and maintenance.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A dual-balance-weight crankshaft for an air compressor, comprising a crankshaft (1), characterized in that: The crankshaft (1) is provided with a main journal (2), a crank arm (5), a connecting rod journal (3), a crank (4) and a rear end shaft (8) in sequence; The bottom of the crank arm (5) is a boss structure, and a detachable left balance block (6) is provided below the boss structure. A detachable right balance block (7) is provided below the crank (4).

2. The dual-balance-block crankshaft of an air compressor according to claim 1, characterized in that: The left balance block (6) and the right balance block (7) are fixed to the crankshaft (1) by bolts. The mating surface of the right balance block (7) in contact with the crank (4) is a curved surface. The outer radius of the right balance block (7) is smaller than the outer radius of the left balance block (6).

3. The dual-balance-block crankshaft of an air compressor according to claim 1, characterized in that: The connecting rod journal (3) is provided with a plurality of needle roller bearings (91), and spacer copper plates (31) are provided between the needle roller bearings (91). The connecting rod (9) is provided on the needle roller bearings (91).

4. The dual-balance-block crankshaft of an air compressor according to claim 3, characterized in that: A piston head (93) is provided at the top of the connecting rod (9), and an oil-pulling needle (92) is provided at the bottom of the connecting rod (9).

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