CN215830934U

CN215830934U - Combined crankshaft for oil-free piston type gas compressor

Info

Publication number: CN215830934U
Application number: CN202122286059.XU
Authority: CN
Inventors: 李文斌; 翟美辰; 石继宏; 张绍明
Original assignee: Anshan Libang Compressors Co ltd
Current assignee: Anshan Libang Compressors Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-02-15
Anticipated expiration: 2031-09-22

Abstract

The utility model belongs to the technical field of gas compressor manufacturing, and particularly relates to a combined crankshaft for an oil-free piston type gas compressor, which is characterized by comprising a transmission shaft, an inner eccentric balance disc, a crank pin bearing, a central shaft block, an adjusting baffle, an outer eccentric balance disc and a fastening bolt, wherein the end part of the transmission shaft is sequentially connected with the inner eccentric balance disc, the central shaft block, the adjusting baffle and the outer eccentric balance disc through the fastening bolt; and the fastening bolt connecting holes on the inner eccentric balance disc and the outer eccentric balance disc are eccentric holes. Compared with the prior art, the utility model has the beneficial effects that: 1) the parts are easy to process; 2) the double-balance disc structure reduces the vibration of the compressor; 3) the volume of the crankcase is reduced; 4) the universality and the interchangeability are obviously improved. 5) The dismouting is convenient, is favorable to promoting the maintenance efficiency.

Description

Combined crankshaft for oil-free piston type gas compressor

Technical Field

The utility model belongs to the technical field of gas compressor manufacturing, and particularly relates to a combined crankshaft for an oil-free piston type gas compressor.

Background

The piston compressor works by the constant change of the working volume formed by the cylinder, the air valve and the piston reciprocating in the cylinder. If the volume loss and energy loss in the actual operation of the piston compressor (i.e. the ideal operation process) are not considered, the operation performed per one rotation of the crankshaft of the piston compressor can be divided into suction, compression and discharge processes. The existing piston type gas compressor crankshaft is composed of a main journal, a crank and a crank pin (connecting rod journal), wherein the main journal inputs torque, and the crank pin transmits the torque to a connecting rod so as to drive a piston to reciprocate. The crank and crank pin make up a curved portion called a bell crank. The crankshaft of the compressor is divided into a crankshaft and a crank shaft according to different crank compositions.

Piston gas compressors undergo reciprocating piston motion when compressing gas, and generate reciprocating and rotational inertial forces that are difficult to balance, thereby causing vibrations of the machine and the foundation. The conventional crankshaft is generally of an integral casting structure, is limited to the reason that a bearing and a connecting rod are sleeved on one side of the integral crankshaft structure, and only a flywheel can be additionally arranged on one side of the crankshaft, so that only limited reciprocating inertia force and rotating inertia force can be balanced, the problem of large vibration is caused, the service life of the bearing is shortened, and the service life of the whole machine is shortened. The gyration radius of the integrally cast crankshaft is influenced by the piston stroke, the larger the piston stroke is, the larger the gyration radius of the crankshaft is, and further the required assembly space is larger.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a combined crankshaft for an oil-free piston type gas compressor, which overcomes the defects of the prior art, adopts a combined crankshaft structure, can be further split into smaller structures, is convenient to assemble, and saves the installation space; two ends of the crankshaft are respectively connected with a balance disc to form a double-balance disc structure, so that the rotational inertia is improved, the reciprocating inertia force is balanced, the vibration of equipment is reduced, and the service life of a moving part is prolonged.

In order to achieve the purpose, the utility model is realized by the following technical scheme:

a combined crankshaft for an oil-free piston type gas compressor is characterized by comprising a transmission shaft, an inner eccentric balance disc, a crank pin bearing, a central shaft block, an adjusting catch, an outer eccentric balance disc and a fastening bolt, wherein the end part of the transmission shaft is sequentially connected with the inner eccentric balance disc, the central shaft block, the adjusting catch and the outer eccentric balance disc through the fastening bolt; the fastening bolt connecting holes on the inner eccentric balance disc and the outer eccentric balance disc are eccentric holes; the transmission shaft end is provided with a first supporting bearing mounting position, and the outer eccentric balance disc is provided with a second supporting bearing mounting position.

Be equipped with crank pin bearing installation tang on the external diameter of central axle piece, two adjacent central axle piece equipment backs form a crank pin bearing mounting groove, and it is spacing to the both sides of crank pin bearing respectively.

The quantity of central axle piece is 3~7, and the homonymy of a plurality of central axle pieces is equipped with adjusts the separation blade mounting groove, the center of central axle piece is equipped with any one of unthreaded hole through-hole, screw thread through-hole or the through-hole of constituteing by partial unthreaded hole and partial screw hole.

The depth of the adjusting separation blade mounting groove is equal to the thickness of the adjusting separation blade plus 0-1 mm.

The number of the eccentric holes is 2-3, and the eccentric distance is 10-60 mm.

And the outer edges of the inner eccentric balance disc and the outer eccentric balance disc are provided with balance weight adjusting gaps in the same direction.

The inner eccentric balance disc and the outer eccentric balance disc are respectively provided with a central shaft block matching hole, and the central shaft block matching holes are connected with adjacent central shaft blocks in a matching mode.

The end part of the transmission shaft is provided with a threaded hole connected with a fastening bolt.

Compared with the prior art, the utility model has the beneficial effects that: 1) the split parts are simple to process, the processing precision is easy to improve, and the product quality is ensured; 2) the double-balance-disc structure is adopted, so that compared with a single-balance-weight crankshaft, the double-balance-disc crankshaft structure is smaller in size and more uniform in stress, the reciprocating inertia force can be balanced while the rotational inertia is improved, the vibration of the compressor is greatly reduced, and the service life of a moving part is prolonged; 3) the combined crankshaft can realize the sequential assembly of a single row of connecting rods, saves most of installation space, reduces the volume of a crankcase and can obviously reduce material cost and space cost compared with the traditional single-throw multi-connecting-rod structure; 4) the universality and interchangeability of the crankshaft are obviously improved, the compressor is almost not limited in the arrangement of the number of the cylinder rows, the number of the central shaft blocks can be correspondingly adjusted along with the increase and decrease of the number of the cylinder rows, the number of drawings and the number of dies are reduced, and the corresponding management cost and the inventory cost are reduced. 5) The combined structure is simple, a special dismounting device is not needed, the dismounting is convenient, the maintenance efficiency is favorably improved, and the downtime is shortened.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a right side view of FIG. 1;

FIG. 3 is a schematic diagram of a central shaft block structure according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an adjusting baffle in the embodiment of the utility model.

In the figure: the method comprises the following steps of 1-a transmission shaft, 2-an inner eccentric balance disc, 3-a crank pin bearing, 4-a central shaft block, 5-an adjusting baffle, 6-an outer eccentric balance disc, 7-a fastening bolt, 8-a counterweight adjusting gap, 9-a first supporting bearing, 10-a second supporting bearing, 11-a snap spring and 12-a connecting rod.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model.

See fig. 1-4, a combined crankshaft for oil-free piston gas compressor, including transmission shaft 1, interior eccentric balance disc 2, crank pin bearing 3, central shaft piece 4, adjust the separation blade 5, outer eccentric balance disc 6 and fastening bolt 7, the tip of transmission shaft 1 passes through fastening bolt 7 and in proper order with interior eccentric balance disc 2, central shaft piece 4, adjust the separation blade 5, outer eccentric balance disc 6 is connected, two adjacent central shaft piece 4 junction external diameters and crank pin bearing 3 accordant connection, the crank pin bearing 3 outside is connected with connecting rod 12. The fastening bolt connecting holes on the inner eccentric balance disk 2 and the outer eccentric balance disk 6 are eccentric holes, and when the transmission shaft 1 rotates, the inner eccentric balance disk 2 and the outer eccentric balance disk 6 move eccentrically to drive the connecting rod 12 to complete reciprocating motion. The end of the transmission shaft 1 is provided with a first supporting bearing 9 mounting position, the outer eccentric balance disc 6 is provided with a second supporting bearing 10 mounting position, the outer side of the second supporting bearing 10 is fixed through a clamp spring 11, and the transmission shaft 1, the first supporting bearing 9 and the second supporting bearing 10 are coaxially arranged.

In the embodiment, be equipped with crank pin bearing installation tang on the external diameter of central axle piece 4, two adjacent 4 back of assembling of central axle pieces form a crank pin bearing installation groove, carry on spacingly and fixed to crank pin bearing 3's both sides respectively. The number of the central shaft blocks 4 is 4, the central shaft blocks correspond to three connecting rods (namely three cylinders) of the gas compressor, the adjusting catch mounting grooves are formed in the same sides of the central shaft blocks 4, and through holes formed by partial unthreaded holes and partial threaded holes are formed in the centers of the central shaft blocks 4. The depth of the adjusting separation blade mounting groove is equal to the thickness of the adjusting separation blade 5 plus 0-1 mm. Through the adjustment to adjusting the thickness of separation blade 5, can make the installation accuracy of crank pin bearing 3 obtain guaranteeing.

The number of the eccentric holes is 2, and the eccentricity h is 20 mm. The value of the eccentricity is determined by the interval value of the reciprocating motion of the connecting rod.

The outer fringe of interior eccentric balance dish 2 and outer eccentric balance dish 6 is equipped with syntropy counter weight and adjusts breach 8, and the disk body quality focus offset that this breach caused and the eccentric quality focus offset phase-match that causes of central spindle piece 4 to the realization both can also balance reciprocal inertia when improving inertia, reduced the vibrations of compressor by a wide margin, and then improve moving part life.

Be equipped with central shaft piece mating holes on interior eccentric balance dish 2 and the outer eccentric balance dish 6 respectively, central shaft piece mating holes is connected with the cooperation of adjacent central shaft piece 4, and 5mm is no less than to the cooperation degree of depth of central shaft piece mating holes to guarantee integrated configuration's joint strength and stability.

Similarly, the end of the transmission shaft 1 is provided with a threaded hole connected with the fastening bolt 7, the depth of the threaded hole is not less than 20mm, and the connection strength and the stability of the combined structure are also ensured.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A combined crankshaft for an oil-free piston type gas compressor is characterized by comprising a transmission shaft, an inner eccentric balance disc, a crank pin bearing, a central shaft block, an adjusting catch, an outer eccentric balance disc and a fastening bolt, wherein the end part of the transmission shaft is sequentially connected with the inner eccentric balance disc, the central shaft block, the adjusting catch and the outer eccentric balance disc through the fastening bolt; the fastening bolt connecting holes on the inner eccentric balance disc and the outer eccentric balance disc are eccentric holes; the transmission shaft end is provided with a first supporting bearing mounting position, and the outer eccentric balance disc is provided with a second supporting bearing mounting position.

2. An assembled crankshaft for an oil-free piston type gas compressor as claimed in claim 1, wherein the outer diameter of the central shaft block is provided with a crank pin bearing mounting spigot, and two adjacent central shaft blocks are assembled to form a crank pin bearing mounting groove for respectively limiting two sides of the crank pin bearing.

3. An oil-free piston type combined crankshaft for a gas compressor as claimed in claim 1, wherein the number of the central shaft blocks is 3-7, the same side of the central shaft blocks is provided with an adjusting baffle mounting groove, and the center of the central shaft block is provided with any one of a unthreaded hole through hole, a threaded through hole or a through hole consisting of a part of unthreaded hole and a part of threaded hole.

4. An assembled crankshaft for an oil-free piston type gas compressor as claimed in claim 1, wherein the depth of the installation groove of the adjusting blade is equal to the thickness of the adjusting blade plus 0-1 mm.

5. A combined crankshaft for an oil-free piston type gas compressor as claimed in claim 1, wherein the number of the eccentric holes is 2-3, and the eccentricity is 10-60 mm.

6. An assembled crankshaft for an oil-free piston type gas compressor as claimed in claim 1, wherein the outer edges of the inner eccentric balance disk and the outer eccentric balance disk are provided with the balance weight adjusting notches in the same direction.

7. An assembled crankshaft for an oil-free piston type gas compressor as claimed in claim 1, wherein the inner eccentric balance disk and the outer eccentric balance disk are respectively provided with a central shaft block fitting hole, and the central shaft block fitting hole is connected with an adjacent central shaft block in a fitting manner.

8. An assembled crankshaft for an oil-free piston type gas compressor as claimed in claim 1, wherein the end of the driving shaft is provided with a threaded hole for connection with a fastening bolt.