CN209976713U

CN209976713U - Linear air compressor and crankshaft structure thereof

Info

Publication number: CN209976713U
Application number: CN201920237860.5U
Authority: CN
Inventors: 李沂航; 冯佳
Original assignee: Taizhou Hongyi Mechanical And Electrical Co Ltd
Current assignee: Zhejiang pengyou electromechanical Co.,Ltd.
Priority date: 2019-02-25
Filing date: 2019-02-25
Publication date: 2020-01-21
Anticipated expiration: 2029-02-25

Abstract

The utility model discloses a orthoscopic air compressor machine and crankshaft structure thereof relates to air compressor machine technical field, and its technical scheme main points are: the crankshaft structure comprises a main shaft and a crank pin eccentric to the main shaft, the main shaft comprises a driving shaft and a main journal which are respectively positioned at two ends of the crank pin, the axes of the driving shaft and the main journal are overlapped, and the driving shaft is used for being connected with a driving source; the crank pin is integrally fixed with a first connecting block, the main journal penetrates through a first mounting hole for a bolt to pass through in the axial direction, a first threaded hole coaxial with the first mounting hole is formed in the first connecting block, the first threaded hole is used for connecting the bolt in the first mounting hole in a threaded mode, and the first connecting block can be separated from the main journal. The crankshaft structure can be disassembled and assembled in multiple sections, so that the crankshaft, the box body, the connecting rod and each bearing can be conveniently disassembled and assembled; the structural strength after the crankshaft is assembled is high.

Description

Linear air compressor and crankshaft structure thereof

Technical Field

The utility model relates to an air compressor machine technical field, in particular to orthoscopic air compressor machine and crankshaft structure thereof.

Background

Air compressors are common equipment for producing compressed air, and are the most common in the past with reciprocating piston type air compressors. The air compressor is driven by the motor to operate, and when the motor drives the crankshaft to rotate, the crankshaft drives the piston to reciprocate in the cylinder through the transmission of the connecting rod, so that the air is compressed.

The Chinese patent application with the prior application publication number of CN107401498A discloses an air compressor for a vehicle, which comprises a crank case, a crank shaft, a connecting rod, a piston, a pin shaft, a cylinder cover, a cylinder body and a valve plate, wherein a cavity with an opening at one end is arranged in the piston; the piston comprises a piston body, a gas seal ring for sealing gas and an oil seal ring for sealing lubricating oil.

The above prior art solutions have the following drawbacks: the crankshaft of the existing air compressor comprises a main journal and a crank pin eccentric to the main journal, wherein the crank pin is used for connecting a connecting rod; the main journals are located at the two ends of the crankpin, respectively, and the crankshaft is generally integrally formed. Referring to fig. 1 of the specification of the patent, the crankshaft has at least two bending sections, and in a crankcase with a narrow space, the crankshaft, the connecting rod and the bearings are difficult to be assembled and disassembled.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model discloses a first aim at provides a crankshaft structure, and the bent axle can carry out the dismouting, has made things convenient for the dismouting of bent axle and connecting rod, each bearing.

The above technical purpose of the present invention can be achieved by the following technical solutions: a crankshaft structure comprises a main shaft and a crank pin eccentric to the main shaft, wherein the main shaft comprises a driving shaft and a main journal which are respectively positioned at two ends of the crank pin, the axes of the driving shaft and the main journal are overlapped, and the driving shaft is used for being connected with a driving source; the crank pin is integrally fixed with a first connecting block, the main journal penetrates through a first mounting hole for a bolt to pass through in the axial direction, a first threaded hole coaxial with the first mounting hole is formed in the first connecting block, the first threaded hole is used for connecting the bolt in the first mounting hole in a threaded mode, and the first connecting block can be separated from the main journal.

Through above-mentioned technical scheme, the drive shaft is used for connecting the output of motor, and the main journal is used for being connected with the box rotation for the rotation of bent axle provides the support. The first connecting block can be separated from the main journal, and after the first connecting block is threaded into the first mounting hole and screwed down, the first connecting block and the main journal are fixed through the bolt, so that the fixing of the crank pin and the main journal is completed. The crank pin and the main journal of the crankshaft structure can be disassembled and assembled, so that the crankshaft can be conveniently installed with the box body, the connecting rod or each bearing; even the space in the box is less, the installation of bent axle can be accomplished through the mode of assembling the bent axle one by one in the box to personnel, and is comparatively convenient.

Preferably, the driving shaft and the crank pin are connected through a second connecting block arranged between the driving shaft and the crank pin, and the second connecting block can be separated from the crank pin; the connecting block I is provided with a second mounting hole for a bolt to pass through, the second mounting hole penetrates through the crank pin along the length direction of the crank pin, the second connecting block is provided with a second threaded hole coaxial with the second mounting hole, and the second threaded hole is used for connecting the bolt in the second mounting hole in a threaded mode.

Through above-mentioned technical scheme, penetrate the bolt and screw up the back in mounting hole two, the bolt is fixed with crank pin and round pin axle. Through setting up connecting block two, the drive shaft forms dismantled and assembled structure with the crank pin, has further made things convenient for the installation of bent axle in the air compressor machine.

Preferably, a pin shaft coaxial with the crank pin is fixed on the second connecting block, a positioning column is arranged at the end part of the crank pin, facing the pin shaft, the end part of the pin shaft, facing the crank pin, is provided with a positioning hole for the positioning column to be inserted, and the threaded hole is located at the bottom of the positioning hole.

Through above-mentioned technical scheme, the crank pin passes through reference column and locating hole grafting formation location with round pin axle, and the steadiness that crank pin and two fixed of connecting block is high.

Preferably, the end part of the pin shaft facing the crank pin is provided with a positioning cylindrical section for sleeving the bearing, and the outer diameter of the positioning cylindrical section is smaller than the outer diameters of the pin shaft and the crank pin on two axial sides of the positioning cylindrical section.

Through the technical scheme, the positioning cylindrical section is externally sleeved with the bearing, and the bearing is rotatably connected between the crank pin and the connecting rod of the piston; the pin rod, the crank pin can play the spacing effect of terminal surface towards the echelonment edge of location cylinder section to the bearing, and the axial displacement of crank pin can not be followed to the bearing, improves the installation degree of stability of bearing.

Preferably, the connecting block two includes the balancing weight, the focus of balancing weight deviates from with the crankpin along the radial of drive shaft mutually, the balancing weight is used for balancing the eccentric force that the crankpin produced when the bent axle rotated.

Through above-mentioned technical scheme, the balancing weight is used for the eccentric weight of balanced bent axle upper crankpin, and the balancing weight has balanced the eccentric power that the crankpin produced when the bent axle rotates, and the atress of each bearing is stable when making the bent axle rotate to reduce the vibration of air compressor machine during operation.

Preferably, the second connecting block is separable from the driving shaft; the connecting block II is provided with a fixing hole for inserting the driving shaft, the connecting block II is provided with a threaded hole III for connecting the bolt in a threaded manner, the threaded hole III is communicated with the fixing hole along the radial direction of the fixing hole, the side wall of the driving shaft is provided with a key groove, and the key groove is used for embedding the bolt in the threaded hole III so as to limit the driving shaft to rotate relative to the connecting block II.

Through above-mentioned technical scheme, the drive shaft can conveniently carry out the dismouting with connecting block two, twists the bolt back in screw hole three, and the bolt can imbed in the keyway in order to restrict the drive shaft and rotate for connecting block two to reach the purpose of transmission torque.

A second object of the present invention is to provide a linear air compressor, the dismounting of the crankshaft and the air compressor is convenient.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a linear air compressor, includes foretell bent axle structure, still includes the box, sets up two cylinders in the box, two it is provided with the piston to slide respectively in the cylinder, two the piston is fixed through setting up the connecting rod between the two, the skew middle part of connecting rod position articulates there is the rocker, the rocker rotates with the crank pin to be connected.

Through the technical scheme, the air compressor is a linear reciprocating air compressor, and the two air cylinders can complete air compression operation when the crankshaft rotates for a circle. Because this air compressor's bent axle can carry out the dismouting, then the dismouting of bent axle and box, rocker, each bearing is comparatively convenient.

Preferably, the number of the connecting rods is two, a space is reserved between the two connecting rods, and the rocker is located between the two connecting rods.

Through the technical scheme, when the rocker drives the connecting rods to move, the two connecting rods which are symmetrical relative to the rocker are stressed stably, and the sliding stability of the piston is improved.

Preferably, the driving shaft is rotatably connected with the box body through a first bearing arranged between the driving shaft and the box body, and the first connecting block is rotatably connected with the box body through a second bearing arranged between the connecting block and the box body.

Through the technical scheme, the bearing is used as a standard part, and compared with a mode of direct rotating contact of the hole shaft, the bearing has lower rotating resistance and longer service life, and can reduce the rotating resistance between the crankshaft and the box body; and the crankshaft and the box body are not easy to wear, and the bearing can be replaced when damaged, so that the service lives of the crankshaft and the box body can be prolonged.

Preferably, the connecting rod includes a connecting ring at a middle portion, an inner ring hole of the connecting ring is penetrated by the crank pin, and the crank pin does not contact the connecting ring when the crankshaft rotates.

Through the technical scheme, the inner ring opening of the connecting ring is used for avoiding the crankshaft, the connecting ring with the annular closed opening has higher strength, the connecting ring with the symmetrical shape enables the gravity center of the connecting rod to be positioned at the volume center of the connecting rod, and the stability of the connecting rod in reciprocating motion is improved.

To sum up, the utility model discloses the beneficial effect who contrasts in prior art does:

1. the crankshaft can be disassembled and assembled in multiple sections, so that the crankshaft, the box body, the connecting rod and each bearing can be conveniently disassembled and assembled;

2. the structural strength of the assembled crankshaft is high;

3. the air compressor has the advantages of good stress of the crankshaft and the connecting rod during operation and high reliability of operation.

Drawings

FIG. 1 is a perspective view of a crankshaft structure according to a first embodiment;

FIG. 2 is a sectional view of a crankshaft structure according to the first embodiment;

fig. 3 is a sectional view of the linear air compressor of the second embodiment;

fig. 4 is a partial perspective view of the linear air compressor according to the second embodiment.

In the figure, 1, a drive shaft; 2. a crank pin; 3. a main journal; 21. a first connecting block; 31. a first mounting hole; 211. a first threaded hole; 4. a second connecting block; 41. a pin shaft; 22. a positioning column; 411. positioning holes; 212. a second mounting hole; 412. a second threaded hole; 413. positioning the cylindrical section; 42. a balancing weight; 43. a fixing hole; 44. a third threaded hole; 11. a keyway; 5. a box body; 51. a cylinder; 6. a piston; 61. a connecting rod; 62. a rocker; 611. a connecting ring; 71. a first bearing; 72. and a second bearing.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 1 and 2, for the utility model discloses a crankshaft structure, including main shaft, eccentric in crank pin 2 of main shaft, the main shaft is including drive shaft 1 and the main journal 3 that are located 2 both ends of crank pin respectively, the axis coincidence of drive shaft 1 and main journal 3, and the axis of crank pin 2 is parallel with drive shaft 1 and skew in drive shaft 1. The driving shaft 1 is used for connecting the output end of a motor, and the main journal 3 is used for being rotatably connected with the box body 5 to provide support for the rotation of a crankshaft.

The crank pin 2 is integrally fixed with a first connecting block 21, the main journal 3 axially penetrates through a first mounting hole 31 for a bolt to pass through, a first threaded hole 211 coaxial with the first mounting hole 31 is formed in the first connecting block 21, and the first threaded hole 211 is used for threaded connection of the bolt in the first mounting hole 31. The first connecting block 21 can be separated from the main journal 3, and after a bolt is penetrated into the main journal 3 and is screwed, the bolt fixes the first connecting block 21 and the main journal 3, so that the fixing of the crank pin 2 and the main journal 3 is completed.

The drive shaft 1 and the crank pin 2 are connected by a connecting block two 4 disposed therebetween, and the connecting block two 4 is separable from the drive shaft 1 and the crank pin 2. A pin shaft 41 coaxial with the crank pin 2 is integrally fixed on the second connecting block 4, a positioning column 22 is arranged at the end part, facing the pin shaft 41, of the crank pin 2, a positioning hole 411 for inserting the positioning column 22 is formed in the end part, facing the crank pin 2, of the pin shaft 41, and the crank pin 2 and the pin shaft 41 are inserted and connected through the positioning column 22 and the positioning hole 411 to form positioning. The first connecting block 21 is provided with a second mounting hole 212 for a bolt to pass through, and the second mounting hole 212 penetrates through the crank pin 2 along the length direction of the crank pin 2. The end of the pin shaft 41 facing the crank pin 2 is provided with a second threaded hole 412 coaxial with the second mounting hole 212, the second threaded hole 412 is located at the bottom of the positioning hole 411, and the second threaded hole 412 is used for threaded connection of a bolt in the second mounting hole 212. And after the bolts are inserted into the second mounting holes 212 and tightened, the bolts fix the crank pin 2 and the pin shaft 41.

The round pin axle 41 is equipped with the location cylinder section 413 that is used for the cover to establish the bearing towards the tip of crank pin 2, and the external diameter of location cylinder section 413 is less than round pin axle 41, the crank pin 2 external diameter of its axial both sides, and round pin axle 41, crank pin 2 can play the spacing effect of terminal surface towards the echelonment edge of location cylinder section 413 to the bearing, and the bearing can not follow the axial displacement of crank pin 2, improves the installation degree of stability of bearing. After the pin shaft 41 is separated from the crank pin 2, a person can conveniently disassemble and assemble the bearing on the positioning cylindrical section 413.

The second connecting block 4 comprises a balancing weight 42 fixed integrally, the center of gravity of the balancing weight 42 deviates from the driving shaft 1, and the deviation direction is the side deviating from the crank pin 2 along the radial direction of the driving shaft 1. The balancing weight 42 is used for balancing the eccentric weight of the crank pin 2 on the crankshaft, and the balancing weight 42 balances the eccentric force generated by the crank pin 2 when the crankshaft rotates, so that the stress of each bearing is stable when the crankshaft rotates, and the vibration of the air compressor during working is reduced.

A fixing hole 43 for the driving shaft 1 to be inserted is formed in the second connecting block 4, a threaded hole third 44 for the bolt to be in threaded connection is formed in the second connecting block 4, and the threaded hole third 44 is specifically formed in the balancing weight 42; the third threaded hole 44 communicates with the fixing hole 43 in the radial direction of the fixing hole 43. The side wall of the driving shaft 1 is provided with a key groove 11, the length direction of the key groove 11 is along the axial direction of the driving shaft 1, and the key groove 11 is used for being embedded by a bolt in the threaded hole III 44 so as to limit the driving shaft 1 to rotate relative to the connecting block II 4, so that the purpose of transmitting torque is achieved.

The driving shaft 1, the crank pin 2 and the main journal 3 of the crankshaft structure can be disassembled and assembled, so that the crankshaft and the box body 5 or bearings can be conveniently installed; even the space in the box 5 is less, the installation of bent axle can be accomplished through the mode of assembling the bent axle one by one in box 5 to personnel, and is comparatively convenient.

Example two:

referring to fig. 3 and 4, the linear air compressor comprises the crankshaft structure, and further comprises a box body 5 and two cylinders 51 arranged in the box body 5, wherein pistons 6 are respectively arranged in the two cylinders 51 in a sliding manner, the two pistons 6 are fixed through a connecting rod 61 arranged between the two pistons, a rocker 62 is hinged to a position of the connecting rod 61 deviating from the middle part, and the rocker 62 is rotatably connected with a crank pin 2 through a bearing. When the driving shaft 1 is driven by the motor to rotate, the crank pin 2 makes a circular motion around the axis of the driving shaft 1, and the crank pin 2 drives the connecting rod 61 to make a reciprocating motion along the axial direction of the cylinder 51 through the rocker 62. The air compressor is a linear reciprocating air compressor, two air cylinders 51 can complete air compression operation when the crankshaft rotates for one circle, and one piston 6 is in a compression stroke, and the other piston 6 is in an air suction stroke.

The number of the connecting rods 61 is two, the two connecting rods 61 are spaced and parallel to each other, and the rocker 62 is located between the two connecting rods 61 and simultaneously establishes an articulation with the two connecting rods 61. When the rocker 62 drives the connecting rods 61 to move, the two connecting rods 61 symmetrical relative to the rocker 62 are stressed stably, and the sliding stability of the piston 6 is improved. The connecting rod 61 includes a connecting ring 611 at the middle, and an inner ring hole of the connecting ring 611 passes the crank pin 2, and the crank pin 2 does not contact the connecting ring 611 when the crankshaft rotates. The connecting ring 611 having a circular closed opening has high strength, and the connecting ring 611 having a symmetrical shape allows the center of gravity of the connecting rod 61 to be located at the center of its volume, thereby improving the stability of the connecting rod 61 during the reciprocating motion.

The driving shaft 1 is rotatably connected with the box body 5 through a first bearing 71 arranged between the driving shaft and the box body, and the connecting block 21 is rotatably connected with the box body 5 through a second bearing 72 arranged between the connecting block and the box body. The bearing is used as a standard component, and compared with a mode that a hole shaft is in direct rotational contact, the bearing has lower rotational resistance and longer service life, and can reduce the rotational resistance between the crankshaft and the box body 5; and the crankshaft and the box body 5 are not easy to be abraded, and the bearing can be replaced when damaged, so that the service lives of the crankshaft and the box body 5 can be prolonged.

Because this air compressor's bent axle is formed by a plurality of parts equipment, even then when the space in the box 5 is less, the installation of bent axle can be accomplished through the mode of assembling the bent axle one by one in box 5 to personnel, and is comparatively convenient, and this air compressor is convenient for produce and makes.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a crankshaft structure, includes main shaft, eccentric in crank pin (2) of main shaft, characterized by: the main shaft comprises a driving shaft (1) and a main journal (3) which are respectively positioned at two ends of a crank pin (2), the axes of the driving shaft (1) and the main journal (3) are overlapped, and the driving shaft (1) is used for connecting a driving source; crank pin (2) an organic whole is fixed with connecting block (21), mounting hole (31) that supply the bolt to pass are seted up in axial run-through to main journal (3), set up on connecting block (21) with mounting hole (31) coaxial screw hole (211), screw hole (211) are used for supplying the bolt threaded connection in mounting hole (31), connecting block (21) can separate with main journal (3).

2. The crankshaft structure as claimed in claim 1, wherein: the driving shaft (1) and the crank pin (2) are connected through a second connecting block (4) arranged between the driving shaft and the crank pin, and the second connecting block (4) can be separated from the crank pin (2); the connecting block I (21) is provided with a second mounting hole (212) for a bolt to pass through, the second mounting hole (212) penetrates through the crank pin (2) along the length direction of the crank pin (2), the second connecting block (4) is provided with a second threaded hole (412) coaxial with the second mounting hole (212), and the second threaded hole (412) is used for allowing the bolt in the second mounting hole (212) to be in threaded connection.

3. A crankshaft structure according to claim 2, wherein: a pin shaft (41) coaxial with the crank pin (2) is fixed on the second connecting block (4), a positioning column (22) is arranged at the end part, facing the pin shaft (41), of the crank pin (2), a positioning hole (411) for inserting the positioning column (22) is formed in the end part, facing the crank pin (2), of the pin shaft (41), and the second threaded hole (412) is located at the bottom of the positioning hole (411).

4. A crankshaft structure according to claim 3, wherein: the end part of the pin shaft (41) facing the crank pin (2) is provided with a positioning cylindrical section (413) for sleeving a bearing, and the outer diameter of the positioning cylindrical section (413) is smaller than the outer diameters of the pin shaft (41) and the crank pin (2) on two axial sides of the positioning cylindrical section.

5. A crankshaft structure according to claim 2, wherein: connecting block two (4) include balancing weight (42), the focus of balancing weight (42) deviates from with crank pin (2) along the radial of drive shaft (1), eccentric force that crank pin (2) produced when balancing weight (42) are used for balanced crankshaft rotation.

6. A crankshaft structure according to claim 2, wherein: the second connecting block (4) is separable from the driving shaft (1); offer fixed orifices (43) that supply drive shaft (1) to peg graft on connecting block two (4), offer screw hole three (44) that supply bolt threaded connection on connecting block two (4), radial and fixed orifices (43) intercommunication along fixed orifices (43) are followed in screw hole three (44), the lateral wall of drive shaft (1) is equipped with keyway (11), keyway (11) are used for supplying the bolt embedding in screw hole three (44) to rotate for connecting block two (4) in order to restrict drive shaft (1).

7. The utility model provides a orthoscopic air compressor machine, characterized by: the crankshaft structure comprises the crankshaft structure and further comprises a box body (5) and two cylinders (51) arranged in the box body (5), wherein pistons (6) are arranged in the cylinders (51) in a sliding mode respectively, the pistons (6) are fixed through connecting rods (61) arranged between the pistons, rocking rods (62) are hinged to positions, deviating from the middle, of the connecting rods (61), and the rocking rods (62) are rotatably connected with crank pins (2).

8. The linear air compressor as claimed in claim 7, wherein: the number of the connecting rods (61) is two, a space is reserved between the two connecting rods (61), and the rocker (62) is located between the two connecting rods (61).

9. The linear air compressor as claimed in claim 7, wherein: the driving shaft (1) is rotatably connected with the box body (5) through a first bearing (71) arranged between the driving shaft and the box body, and the connecting block (21) is rotatably connected with the box body (5) through a second bearing (72) arranged between the connecting block and the box body.

10. The linear air compressor as claimed in claim 8, wherein: the connecting rod (61) comprises a connecting ring (611) positioned in the middle, an inner ring hole of the connecting ring (611) is used for the crank pin (2) to pass through, and the crank pin (2) does not contact with the connecting ring (611) when the crankshaft rotates.