Motor for reciprocating compressor

Abstract

The utility model discloses a motor for a reciprocating compressor, which comprises a motor base, a stator fixed in the motor base, a rotor arranged in the stator in a penetrating manner and a fan arranged at one axial end of the rotor, and the other axial end of the rotor extends out of the motor base to form a shaft extension end. The stator comprises a stator body and a plurality of stator ribs arranged on the periphery of the stator body, a plurality of connecting plates partially extending into the base are arranged in the circumferential direction of the base, and the stator ribs are fixed on the corresponding connecting plates. The motor for the reciprocating compressor provided by the utility model can improve the structural strength, thereby prolonging the service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors, and particularly relates to a motor for a reciprocating compressor. Background Art

[0002] A reciprocating compressor belongs to a positive displacement compressor, which relies on the periodic change of the working volume of the cylinder to compress gas so as to achieve the purpose of increasing the working pressure.

[0003] In the prior art, after the stator of the motor of the reciprocating compressor is installed in the machine base, there is no auxiliary fixing measure through interference fit.

[0004] However, the periodic impact on the motor of the reciprocating compressor easily causes loosening of parts such as the stator and rotor, and finally leads to motor failure. Content of the Utility Model

[0005] The purpose of the utility model is to provide a motor for a reciprocating compressor, which can improve the stability and strength of the stator fixing structure of the motor.

[0006] Based on the above problems, the technical solution provided by the utility model is as follows:

[0007] A motor for a reciprocating compressor includes a machine base, a stator fixed in the machine base, a rotor passing through the stator, and a fan installed at one axial end of the rotor. The other axial end of the rotor extends outside the machine base to form a shaft extension end. The stator includes a stator body and a plurality of stator ribs arranged on the outer periphery of the stator body. A plurality of connecting plates partially extending into the machine base are provided on the circumference of the machine base, and the stator ribs are fixed on the corresponding connecting plates.

[0008] In some embodiments, both ends of the stator rib in the length direction are fixedly connected to the connecting plate through dowel pins, and a support ring is provided between the connecting plate and the stator rib where the dowel pins are located.

[0009] In some embodiments, an end cover is provided at one end of the machine base close to the fan. A net window is detachably arranged on the end cover. An inspection hole corresponding to the fan is provided on the end cover. A plurality of fixing blocks are provided on the inner circumference of the end cover at the inspection hole. The net window is fastened to the plurality of fixing blocks through a plurality of screws.

[0010] In some embodiments, both ends of the rotor are rotatably supported on the machine base through bearing mechanisms. The bearing mechanisms include an inner cover, an outer cover, a bearing and an oil slinger arranged between the inner cover and the outer cover. The inner cover and the outer cover are fixed on the end covers at both ends of the machine base. The oil slinger is fixed on the rotor and has a clearance fit with the outer cover and is sealed by a labyrinth seal. The outer cover is connected with an oil injection pipe and an oil drain pipe.

[0011] In some of these embodiments, the oil injection pipe and the oil discharge pipe extend along the horizontal direction on the same side of the outer cover.

[0012] In some of these embodiments, the fan includes a fan sleeve and a fan blade assembly disposed on the outer periphery of the fan sleeve. The fan blade assembly includes a first ring plate, a second ring plate, and a third ring plate that are arranged in parallel and at intervals. A plurality of first fan blades are connected between the first ring plate and the second ring plate, and a plurality of second fan blades are connected between the second ring plate and the third ring plate.

[0013] In some of these embodiments, the plurality of first fan blades and the plurality of second fan blades are evenly spaced along the circumferential direction of the fan sleeve, and the first fan blades and the second fan blades are arranged in an alternating manner.

[0014] In some of these embodiments, the radial length of the second fan blade is less than that of the first fan blade.

[0015] In some of these embodiments, the fan is in interference fit with the rotor, and a fixing plate is fixed to the end of the rotor. The fixing plate is fixedly connected to the fan.

[0016] In some of these embodiments, the fixing plate is fixedly connected to the rotor through a bolt assembly, and the fixing plate is fixedly welded to the fan.

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] 1. A plurality of stator ribs are circumferentially arranged on the stator. The stator ribs are fixed to the connecting plate of the machine base through dowel pins, which can improve the fixing strength of the stator and prevent the stator from loosening due to the impact on the machine base.

[0019] 2. A plurality of fixing blocks are provided on the end cover of the machine base. The mesh window is fastened to the plurality of fixing blocks through a plurality of screws, which facilitates the disassembly of the mesh window and the maintenance of the fan, and improves work efficiency.

[0020] 3. The structure of the bearing mechanism is simple. An oil slinger and a labyrinth seal of the outer cover are adopted. Compared with the structure of arranging an oil slinger between the bearing outer cover and the bearing in the prior art, an end shaft oil seal does not need to be arranged, reducing the wear of parts.

[0021] 4. The oil injection pipe and the oil discharge pipe of the bearing mechanism extend along the horizontal direction on the same side of the outer cover, which can prevent water and dust, and can achieve oil injection without stopping the machine.

[0022] 5. The fan blade assembly includes three ring plates arranged in parallel and at intervals. A plurality of fan blades are arranged between adjacent ring plates, which can increase the air volume of the fan and improve the mechanical strength of the fan at the same time.

[0023] 6. By fixing a fixing plate at the end of the rotating shaft, and fixedly connecting the fixing plate with the fan sleeve, the frictional force between the fixing plate and the end of the rotating shaft firmly fixes the fan, improving the reliability of the fan and thus extending the service life of the motor.

[0024] 7. The fixing plate and the fan sleeve are fixed by welding, which can reduce the shear force borne by the bolt assembly and improve the strength of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. The drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of an embodiment of the motor for a reciprocating compressor of the present invention;

[0027] Figure 2 It is a schematic installation structure diagram of the stator in the embodiment of the present invention;

[0028] Figure 3 It is a schematic installation structure diagram of the fan in the embodiment of the present invention;

[0029] Figure 4 It is one of the schematic structural diagrams of the fan in the embodiment of the present invention;

[0030] Figure 5 It is the second schematic structural diagram of the fan in the embodiment of the present invention;

[0031] Figure 6 It is one of the schematic installation structure diagrams of the wire mesh window in the embodiment of the present invention;

[0032] Figure 7 It is the second schematic installation structure diagram of the wire mesh window in the embodiment of the present invention;

[0033] Figure 8 It is a schematic structural diagram of the bearing mechanism in the embodiment of the present invention;

[0034] Figure 9 For Figure 8 the sectional view taken along line A - A;

[0035] Wherein:

[0036] 1. Frame; 1 - 1. Connecting plate; 1 - 2. Reinforcing rib;

[0037] 2. Stator; 2 - 1. Stator body; 2 - 2. Stator rib;

[0038] 3. Rotor;

[0039] 4. Fan; 4-1. Fan sleeve; 4-2. First ring plate; 4-3. Second ring plate; 4-4. Third ring plate; 4-5. First fan blade; 4-6. Second fan blade;

[0040] 5. Pin;

[0041] 6. Support ring;

[0042] 7. Bearing mechanism; 7-1. Inner cover; 7-2. Outer cover; 7-3. Bearing; 7-4. Oil slinger; 7-5. Oil injection pipe; 7-6. Oil drain pipe; 7-7. Shaft retaining ring;

[0043] 8. End cover;

[0044] 9. Mesh window;

[0045] 10. Fixed block;

[0046] 11. Screw;

[0047] 12. Fixed plate;

[0048] 13. Bolt;

[0049] 14. Lock washer. Detailed implementation manners

[0050] The above solution will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are for illustrating the present invention and not for limiting the scope of the present invention. The implementation conditions adopted in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually those in conventional experiments.

[0051] As Figure 1 shown, it is a schematic structural diagram of an embodiment of the present invention. A motor for a reciprocating compressor is provided, which includes a machine base 1, a stator 2 fixed in the machine base 1, a rotor 3 penetrating through the stator 2, and a fan 4 installed at one axial end of the rotor 3. The other axial end of the rotor 3 extends outside the machine base 1 to form a shaft extension end.

[0052] As Figure 2 shown, the stator 2 includes a stator body 2-1 and a plurality of stator ribs 2-2 provided on the outer periphery of the stator body 2-1. A plurality of connecting plates 1-1 partially extending into the machine base 1 are fixedly provided in the circumferential direction of the machine base 1. Each stator rib 2-2 is fixed on the corresponding connecting plate 1-1. By the fixed connection between the stator rib 2-2 and the connecting plate 1-1, the stability of the installation structure of the stator 2 on the machine base 1 can be improved, the loosening of the stator 2 caused by the periodic impact of the compressor can be avoided, and the service life of the motor can be extended.

[0053] Specifically, both ends of the stator rib 2-2 in the length direction are fixedly connected to the connecting plate 1-1 through dowel pins 5 respectively, which facilitates the connection between the stator rib 2-2 and the connecting plate 1-1. A support ring 6 is sleeved between the dowel pin 5 and the stator rib 2-2. The support ring 6 is fixed on the machine base 1, which can further improve the structural stability and reduce looseness.

[0054] To improve the structural strength, a plurality of reinforcing ribs 1-2 are provided on the outer wall of the machine base 1. The plurality of reinforcing ribs 1-2 are arranged at intervals along the length direction of the machine base 1 and extend in the vertical direction.

[0055] As Figure 6 and Figure 7 shown, an end cover 8 is provided at one end of the machine base 1 close to the fan 4. A net window 9 is detachably arranged on the end cover 8. An inspection hole corresponding to the fan 4 is provided on the end cover 8. A plurality of fixing blocks 10 are circumferentially arranged on the inner side of the end cover 8 around the inspection hole. The net window 9 is fastened to the plurality of fixing blocks 10 through a plurality of screws 11. The arrangement of the plurality of fixing blocks 10 on the end cover 8 facilitates the installation and disassembly of the net window 9 and improves the installation and maintenance efficiency.

[0056] Both ends of the rotor 3 are rotatably supported on the machine base 1 through bearing mechanisms 7 respectively. As Figure 8 and Figure 9 shown, the bearing mechanism 7 includes an inner cover 7-1, an outer cover 7-2, a bearing 7-3 arranged between the inner cover 7-1 and the outer cover 7-2, and an oil slinger 7-4. The inner cover 7-1 and the outer cover 7-2 are fixed on the end covers at both ends of the machine base 1. The oil slinger 7-4 is fixed on the rotor 3 and has a clearance fit with the outer cover 7-2 and is sealed by a labyrinth seal. During installation, the oil slinger 7-4 is locked on the rotor 3 through a shaft retaining ring 7-7. An oil injection pipe 7-5 and an oil drain pipe 7-6 are provided on the outer cover 7-2. Lubricating grease is injected into the outer cover 7-2 through the oil injection pipe 7-5 to lubricate the bearing 7-3, and the excess grease is discharged through the oil drain pipe 7-6.

[0057] In this example, the oil injection pipe 7-5 and the oil drain pipe 7-6 extend in the horizontal direction on the same side of the outer cover 7-2. On the one hand, it can play a role in waterproofing and dustproofing. On the other hand, it is convenient for the operator to operate and realizes oil injection and drainage without stopping the machine.

[0058] As Figures 3 to 5 shown, the fan 4 includes a fan sleeve 4-1 and a fan blade assembly arranged on the circumference of the fan sleeve 4-1. The rotor 3 is key-connected and interference-fitted with the fan sleeve 4-1.

[0059] To improve the strength of the fan structure, a fixing plate 12 is fixed at the end of the rotor 3. The fixing plate 12 is fixedly connected to the fan sleeve 4-1.

[0060] In this example, the fixing plate 12 is in a disc shape. The outer diameter of the fixing plate 12 is larger than the end of the rotating shaft 1 and smaller than the fan sleeve 4-1.

[0061] Specifically, the fixing plate 12 is fixed to the end of the rotor 3 by a bolt assembly. Preferably, the bolt assembly includes two bolts 13 arranged radially along the fixing plate 12. To facilitate the connection of the bolts 13, through holes for the bolts 13 to pass through are provided on the fixing plate 12. To facilitate hoisting, two threaded holes for fixing the hoisting jig are also provided on the fixing plate 12.

[0062] To improve the structural stability, a stop washer 14 is provided between the bolt 13 and the outer end face of the fixing plate 12.

[0063] In this example, the fixing plate 12 is fixedly welded to the fan sleeve 4-1. During installation, a part of the rotor 3 extends out of the fan sleeve 4-1, and a gap for accommodating solder is reserved between the fan sleeve 4-1 and the fixing plate 12. In this way, the shear force of the bolt assembly can be reduced, and the strength of the structure can be improved.

[0064] As Figure 4 and Figure 5 shown, the fan blade assembly includes a first ring plate 4-2, a second ring plate 4-3, and a third ring plate 4-4 that are arranged in parallel at intervals. The first ring plate 4-2 is fixed to the fan sleeve 4-1, and a plurality of first fan blades 4-5 are connected between the first ring plate 4-2 and the second ring plate 4-3. A plurality of second fan blades 4-6 are connected between the second ring plate 4-3 and the third ring plate 4-4. The plurality of first fan blades 4-5 and the plurality of second fan blades 4-6 are respectively arranged at equal intervals along the circumferential direction of the fan sleeve 4-1. The first fan blades 4-5 and the second fan blades 4-6 are arranged staggeredly and have the same number. Preferably, the second fan blade 4-6 is arranged between two first fan blades 4-5 and has equal angles with the two first fan blades 4-5. The radial length of the second fan blade 4-6 is less than that of the first fan blade 4-5. For example, if the number of the first fan blades and the second fan blades is both n, then the angle between the fan blades of the fan is 360 / 2n. In this way, while increasing the air volume of the fan, the mechanical strength of the fan is increased.

[0065] In summary, the motor can adapt to the working environment of the reciprocating compressor, and improve the structural strength and service life.

[0066] The above examples are only for explaining the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An electric motor for a reciprocating compressor, comprising a frame, a stator fixed within the frame, a rotor disposed through the stator, and a fan mounted at one axial end of the rotor. The other axial end of the rotor extends outside the frame to form a shaft extension end, and is characterized in that: The stator includes a stator body and a plurality of stator ribs disposed on the outer periphery of the stator body. A plurality of connecting plates that partially extend into the interior of the frame are provided in the circumferential direction of the frame, and the stator ribs are fixed to the corresponding connecting plates.

2. The motor for a reciprocating compressor according to claim 1, characterized in that: Both ends of the stator rib in the length direction are fixedly connected to the connecting plate via dowel pins, and a support ring is provided between the connecting plate and the stator rib where the dowel pin is located.

3. The motor for a reciprocating compressor according to claim 1, characterized in that: An end cover is provided at one end of the frame close to the fan. A window screen is detachably provided on the end cover. An inspection hole corresponding to the fan is provided on the end cover. A plurality of fixing blocks are provided on the inner circumferential side of the end cover at the inspection hole. The window screen is fastened to the plurality of fixing blocks by a plurality of screws.

4. The motor for a reciprocating compressor according to claim 1, characterized in that: Both ends of the rotor are rotatably supported on the frame via bearing mechanisms. Each bearing mechanism includes an inner cover, an outer cover, a bearing and an oil slinger disposed between the inner cover and the outer cover. The inner cover and the outer cover are fixed to the end covers at both ends of the frame. The oil slinger is fixed to the rotor and has a clearance fit with the outer cover and a labyrinth seal. The outer cover is connected with an oil injection pipe and an oil discharge pipe.

5. The motor for a reciprocating compressor according to claim 4, characterized in that: The oil injection pipe and the oil discharge pipe extend along the horizontal direction on the same side of the outer cover.

6. The motor for a reciprocating compressor according to claim 1, characterized in that: The fan includes a fan sleeve and a fan blade assembly disposed on the outer periphery of the fan sleeve. The fan blade assembly includes a first ring plate, a second ring plate and a third ring plate arranged in parallel and at intervals. A plurality of first fan blades are connected between the first ring plate and the second ring plate, and a plurality of second fan blades are connected between the second ring plate and the third ring plate.

7. The motor for a reciprocating compressor according to claim 6, characterized in that: The plurality of first fan blades and the plurality of second fan blades are evenly spaced in the circumferential direction of the fan sleeve, and the first fan blades and the second fan blades are arranged in an alternating manner.

8. The motor for a reciprocating compressor according to claim 6, characterized in that: The radial length of the second fan blade is smaller than that of the first fan blade.

9. The motor for a reciprocating compressor according to claim 6, characterized in that: The fan has an interference fit with the rotor, and a fixing plate is fixed to the end of the rotor. The fixing plate is fixedly connected to the fan.

10. The motor for a reciprocating compressor according to claim 9, characterized in that: The fixing plate is fixedly connected to the rotor via a bolt assembly, and the fixing plate is fixedly connected to the fan by welding.

Images