A square motor shaft for a vacuum pump

Abstract

The present invention belongs to the technical field of motor shafts, and specifically is a square motor shaft for a vacuum pump, comprising a main shaft and a square shaft, wherein the square shaft is used to be connected to a rotor, wherein a rectangular groove corresponding to the square shaft is provided in the rotor, and an abutment plate, an adjusting rod and a fastener are provided on the square shaft. By setting the square shaft, after the square shaft 2 is inserted into the rectangular groove in the rotor, the motor shaft is started to rotate, and the motor shaft directly drives the rotor to operate through the square shaft 2. Compared with the traditional driving claw matching structure, the driving claw is eliminated, thus saving costs and installation defect rate, reducing the cost of the vacuum pump, and improving the qualified rate of vacuum pump installation. Through the matching of the abutment plate, the adjusting rod and the fastener, the motor shaft not only has the function of automatically adjusting the matching relationship after wear, but is also easy to disassemble and assemble, and has a better use effect.

Description

Technical Field

[0001] The invention belongs to the field of motor shafts, in particular to a square motor shaft of a vacuum pump. Background Art

[0002] In the manufacture of vacuum pumps, the motor shaft is an important component. As the rotating axis of the motor, the motor shaft's main function is to support the motor's rotor and bear the weight of the rotor. The motor shaft needs to be precisely matched with the rotor and other components to ensure the efficiency and stability of power transmission.

[0003] A patent document with publication number CN117536990A discloses a motor spindle and a motor, wherein the motor spindle includes a spindle and a spindle housing, a connecting ring is provided between the spindle and the spindle housing, the connecting ring is connected by a locking nut, a thrust bearing and a tapered bearing are sleeved on the spindle, an elastic abutment device and an adjustment device are provided between the tapered bearing and the thrust bearing, the tapered bearing is driven to move axially along the spindle through a side cam and a connecting device, the rotational motion is converted into axial motion, and the air floating clearance of the tapered bearing is adjusted, so that the spindle can adapt to more working conditions and the load-bearing capacity can adapt to a wider range of speeds.

[0004] There are still some problems with the above technical solution. Conventional vacuum pump motor bearings are generally circular in structure. The vacuum pump motor shaft and the rotor are matched through the driving claws. The motor shaft and the driving claws are interference fit. When the vacuum pump is running, the motor shaft drives the driving claws to rotate, and the driving claws drive the rotor to operate. However, there are risks in the cooperation between the motor shaft and the driving claws. The circular interference fit method has very high requirements on the roundness of the motor shaft and the driving claws. After long-term use, the contact surface between the circular motor shaft and the driving claws will produce problems such as wear, thereby affecting the cooperation between the motor shaft and the driving claws. In addition, the driving claws need to be manufactured and assembled separately to drive the rotor to operate, which also requires additional assembly and inspection between the driving claws and the rotor, increasing the cost of the entire vacuum pump.

[0005] To this end, the present invention provides a square motor shaft for a vacuum pump. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the square motor shaft of a vacuum pump described in the present invention includes a main shaft and a square shaft, the longitudinal section of the main shaft is circular, the longitudinal section of the square shaft is rectangular, the square shaft and the main shaft are located on the same axial line, the square shaft is used to be connected to a rotor, and a rectangular groove corresponding to the square shaft is provided in the rotor.

[0008] Preferably, abutment plates are movably inserted on the four side walls of the square shaft respectively, and the abutment plates are provided with guide rods inserted into the interior of the square shaft.

[0009] Preferably, an assembly groove is provided in the square shaft; an adjusting rod is movably provided in the assembly groove, the assembly groove, the adjusting rod and the motor shaft are coaxial, a cone ring is provided on the adjusting rod, and after the adjusting rod moves, the guide rod is driven to move outward through the cone ring.

[0010] Preferably, the adjusting rod comprises: a main rod, the longitudinal section of the main rod is circular, the main rod comprises a thick rod and a thin rod, the outer diameter of the tapered ring is the same as that of the thick rod; a threaded rod and a screw head are respectively arranged at both ends of the main rod, a thread groove corresponding to the threaded rod is arranged inside the square shaft, and the screw head is polygonal.

[0011] Preferably, the assembly groove includes a thread groove, a limit groove and an operating groove, the threaded rod is threadedly connected to the thread groove, the main rod and the cone ring are located in the limit groove, the screw head is located in the operating groove, and the outer diameters of the thread groove, the limit groove and the operating groove increase successively.

[0012] Preferably, two guide rods are provided on the abutment plate, and two cone rings are provided on the adjustment rod.

[0013] Preferably, the adjusting rod also includes a groove arranged on the screw head, the side wall of the groove is sloped, and a plurality of recessed grooves are arranged on the annular side wall of the operating groove, in which a fastener is movably inserted, and one end of the fastener close to the axis of the adjusting rod is inserted into the groove, and a tension spring is arranged in the recessed groove for driving the fastener away from the axis of the adjusting rod.

[0014] Preferably, the fasteners are distributed along the radial direction of the adjusting rod, and the fasteners include: an inner rod movably inserted in the sink groove, the inner rod extending to the outside of the sink groove; an outer rod hinged to the inner rod; and a bevel plate fixed to the outer rod, the bevel plate being inserted into the groove.

[0015] Preferably, the fastener further comprises: a slot provided at the end of the inner rod; and a latch member movably plugged into the outer rod, with the end of the latch member inserted into the slot.

[0016] Preferably, a spacing is left between the annular side wall of the operating groove and the outer side wall of the screw head, and the outer rod and the bevel plate are located within the spacing after rotation.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The square motor shaft of a vacuum pump described in the present invention is provided with a square shaft. After the square shaft 2 is inserted into the rectangular groove in the rotor, the motor shaft is started to rotate. The motor shaft directly drives the rotor to operate through the square shaft 2. Compared with the traditional driving claw matching structure, the driving claw is eliminated, which saves cost and installation defect rate, reduces the cost of the vacuum pump, and improves the qualified rate of vacuum pump installation.

[0019] 2. The square motor shaft of a vacuum pump described in the present invention arranges an abutment plate on the outside of the square shaft, adjusts the extension distance of the abutment plate by an adjusting rod, and fixes the abutment plate by fasteners to ensure stable cooperation between the abutment plate and the rotor. The square motor shaft is not only suitable for rotors of different sizes, but also can continue to be used by adjusting the extension distance of the abutment plate after the abutment plate is worn. When the abutment plate is excessively worn, it only needs to be disassembled and assembled, eliminating the trouble of disassembling both ends of the motor shaft and the need to replace the entire motor shaft, which is more convenient to use.

[0020] 3. The square motor shaft of a vacuum pump described in the present invention, by arranging a tension spring on the fastener and cooperating with a groove with a slope, uses the centrifugal force generated by the fastener to drive the adjusting rod during the operation of the motor shaft, which can not only prevent the adjusting rod from loosening, but also generate an outward pushing force on the abutment plate, thereby improving the matching effect between the abutment plate and the rotor. The motor shaft not only has the function of automatically adjusting the matching relationship after wear, but also is easy to disassemble and assemble, and has a better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 is a three-dimensional diagram of the first embodiment of the present invention;

[0023] Figure 2 is a front view of the second embodiment of the present invention;

[0024] Figure 3 It is the exploded diagram of the square shaft and the abutment plate;

[0025] Figure 4 It is a cross-sectional view of the matching structure of the square shaft and the abutment plate;

[0026] Figure 5 is an exploded view of the adjustment rod, a single abutment plate and a fastener;

[0027] Figure 6 It is a square axial section view;

[0028] Figure 7 It is an exploded view of the fastener;

[0029] Figure 8 It is the bottom view of the inner rod;

[0030] In the figure: 1. main shaft; 2. square shaft; 21. assembly groove; 211. threaded groove; 212. limit groove; 213. operating groove; 22. countersunk groove; 3. abutment plate; 31. guide rod; 4. adjusting rod; 41. main rod; 42. threaded rod; 43. screw head; 44. groove; 5. cone ring; 6. fastener; 61. inner rod; 62. outer rod; 63. bevel plate; 64. slot; 65. latch. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods. Embodiment 1

[0032] like Figure 1 As shown, a square motor shaft of a vacuum pump described in an embodiment of the present invention includes a main shaft 1 and a square shaft 2, the longitudinal section of the main shaft 1 is circular, the longitudinal section of the square shaft 2 is rectangular, the square shaft 2 and the main shaft 1 are located on the same axial line, the square shaft 2 is used to be connected to the rotor, and a rectangular groove corresponding to the square shaft 2 is provided in the rotor.

[0033] Specifically, the square shaft 2 is preferably but not limited to a square shape. The square shaft 2 has an interference fit with the rectangular groove of the rotor. After the square shaft 2 is inserted into the rectangular groove of the rotor, the main shaft 1 is started to rotate. The main shaft 1 drives the rotor to rotate through the square shaft 2. The motor shaft directly drives the rotor to operate. Compared with the traditional driving claw matching structure, the driving claw is eliminated, which saves cost and installation defect rate, reduces the cost of the vacuum pump, and improves the vacuum pump installation qualification rate. Embodiment 2

[0034] like Figure 2-3 As shown, in contrast to Example 1, another embodiment of the present invention is that abutment plates 3 are movably inserted on the four side walls of the square shaft 2 , and the abutment plates 3 are provided with guide rods 31 inserted into the interior of the square shaft 2 .

[0035] Specifically, the movement of the abutment plate 3 away from the axis of the motor shaft is outward movement; the side wall of the square shaft 2 is provided with a guide groove corresponding to the guide rod 31. The motor shaft cooperates with the rotor through the square shaft 2. The four side walls of the square shaft 2 are contact surfaces, which are prone to wear. Wear will affect the cooperation between the motor shaft and the rotor. In order to eliminate this effect, it is necessary to replace the entire motor shaft or take out the motor shaft and then repair the square shaft 2. The cost of replacing the entire motor shaft is high. When disassembling the entire motor shaft, both ends of the motor shaft need to be removed, which is troublesome to operate. By arranging the abutment plate 3 on the side wall of the square shaft 2, after the square shaft 2 is inserted into the rotor, the abutment plate 3 contacts the rectangular groove in the rotor. The abutment plate 3 is the main friction contact surface, and the wear is mainly concentrated on the abutment plate 3. When wear occurs, only the part of the square shaft 2 connected to the rotor needs to be disassembled, and then the abutment plate 3 with wear can be taken out from the square shaft 2, which saves the trouble of disassembling both ends of the motor shaft, and there is no need to replace the entire motor shaft, which is more convenient to use.

[0036] It should be noted that the guide rod 31 and the square shaft 2 are preferably but not limited to friction fit, and the friction force is not less than the gravity of the abutment plate 3 and the guide rod 31 to prevent the lower abutment plate 3 from slipping off the square shaft 2 under the action of gravity.

[0037] like Figure 2-5 As shown, the square shaft 2 is provided with a mounting groove 21; an adjusting rod 4 is movably provided in the mounting groove 21, the mounting groove 21, the adjusting rod 4 and the motor shaft are coaxial, and a cone ring 5 is provided on the adjusting rod 4. After the adjusting rod 4 moves, the guide rod 31 is driven to move outward through the cone ring 5.

[0038] Specifically, in Figure 4 In the embodiment, when the outer wall of the abutment plate 3 is worn and thinned, the fitting effect between the abutment plate 3 and the inner wall of the rectangular groove in the rotor is reduced; the adjusting rod 4 is moved to the left, and after the adjusting rod 4 is moved to the left, the abutment plate 3 is driven to move outward through the cone ring 5, so that the abutment plate 3 is tightly against the inner wall of the rectangular groove in the rotor. By setting the adjusting rod 4 to adjust the outward extension distance of the abutment plate 3, it can adapt to the wear condition of the abutment plate 3 and improve the interference fit effect between the abutment plate 3 and the rotor. In addition, this method is also suitable for rotors with different rectangular groove sizes and has better applicability.

[0039] like Figure 4-5 As shown, the adjusting rod 4 includes: a main rod 41, the longitudinal section of the main rod 41 is circular, the main rod 41 includes a thick rod and a thin rod, and the tapered ring 5 has the same outer diameter as the thick rod; a threaded rod 42 and a screw head 43 are respectively arranged at both ends of the main rod 41, and a thread groove 211 corresponding to the threaded rod 42 is provided inside the square shaft 2, and the screw head 43 is polygonal.

[0040] Specifically, the thread head is located at an end of the square shaft 2 away from the main shaft 1 , and the thread head is polygonal in shape, so that an operator can use a wrench or other device to turn the adjusting rod 4 .

[0041] like Figure 4-6 As shown, the assembly groove 21 includes a thread groove 211, a limit groove 212 and an operating groove 213, the threaded rod 42 is threadedly connected to the thread groove 211, the main rod 41 and the cone ring 5 are located in the limit groove 212, the screw head 43 is located in the operating groove 213, and the outer diameters of the thread groove 211, the limit groove 212 and the operating groove 213 increase successively.

[0042] Specifically, the guide rod 31 is inserted into the limiting groove 212 , and the adjusting rod 4 is threadedly connected to the square shaft 2 through the cooperation between the threaded rod 42 and the threaded groove 211 . The adjusting rod 4 can be driven to move left and right inside the square shaft 2 by rotating the screw head 43 .

[0043] like Figure 3-5 As shown, two guide rods 31 are provided on the abutting plate 3 , and two cone rings 5 ​​are provided on the adjusting rod 4 .

[0044] Specifically, by providing two left and right groups of cone rings 5 ​​and guide rods 31 , the force balance on both sides of the abutment plate 3 is improved, thereby avoiding the problem of stress concentration, aggravated loss and easy deflection of the abutment plate 3 due to unilateral force.

[0045] like Figure 4-8 As shown, the adjusting rod 4 also includes a groove 44 arranged on the screw head 43, and the side wall of the groove 44 is sloped. A plurality of recessed grooves 22 are arranged on the annular side wall of the operating groove 213, and a fastener 6 is movably inserted in the recessed groove 22. One end of the fastener 6 close to the axis of the adjusting rod 4 is inserted into the groove 44, and a tension spring 7 is arranged in the recessed groove 22 for driving the fastener 6 away from the axis of the adjusting rod 4.

[0046] Specifically, after the motor shaft and the rotor are assembled, during use, the matching effect between the two may deteriorate due to wear. When wear occurs, it is necessary to adjust the outward movement distance of the abutment plate 3 and continue to extend the abutment plate 3 outward so that the motor shaft and the rotor can be better assembled. For this purpose, a fastener 6 is provided to adjust the position of the adjusting rod 4 and the abutment plate 3.

[0047] exist Figure 4In the embodiment, the left outer diameter of the groove 44 is smaller than the right outer diameter, and the movement of the fastener 6 away from the axis of the motor shaft is outward movement; the motor shaft rotates rapidly during operation, and the fastener 6 moves outward under the action of centrifugal force. After the fastener 6 moves outward, it abuts against the slope in the groove 44, thereby generating a leftward force on the adjusting rod 4, which can prevent the adjusting rod 4 from moving rightward, ensure the stable contact between the cone ring 5 and the guide rod 31, and prevent the abutment plate 3 from moving inward, thereby improving the problem of reduced assembly effect between the abutment plate 3 and the rotor rectangular groove due to the adjustment rod 4 moving rightward and the abutment plate 3 moving inward.

[0048] like Figure 4-8 As shown, the fastener 6 is distributed along the radial direction of the adjusting rod 4, and the fastener 6 includes: an inner rod 61 movably inserted in the sink groove 22, and the inner rod 61 extends to the outside of the sink groove 22; an outer rod 62 hinged to the inner rod 61; and a bevel plate 63 fixedly connected to the outer rod 62, and the bevel plate 63 is inserted into the groove 44.

[0049] Specifically, the two ends of the tension spring 7 are connected to the inner rod 61 and the bottom of the groove 22 respectively, and the bevel plate 63 is inserted into the groove 44 and contacts the slope in the groove 44; Figure 4 Taking the fastener 6 in the middle as an example, the tension spring 7 generates an upward pulling force on the fastener 6. After the fastener 6 moves up, the bevel plate 63 contacts the slope in the groove 44, generating an inclined force on the slope, which can prevent the screw head 43 from moving rightward, and at the same time generate a force on the screw head 43 along the vertical plane, so that the screw barrel has a tendency to rotate. The rotation tendency is consistent with the rotation direction when the screw head 43 is tightened, that is, after the fastener 6 moves up, a force is generated on the screw head 43 to tighten the screw head 43, which further strengthens the effect of preventing the adjusting rod 4 from moving rightward and loosening, thereby ensuring the close fit between the abutment plate 3 and the rotor.

[0050] The motor shaft rotates rapidly during operation, and the fastener 6 has a tendency to move outward under the action of centrifugal force, which can further improve the effect of preventing the adjusting rod 4 from moving rightward and loosening.

[0051] like Figure 4-8 As shown, the fastener 6 further includes: a slot 64 provided at the end of the inner rod 61 ; and a latch member 65 movably plugged into the outer rod 62 , with the end of the latch member 65 inserted into the slot 64 .

[0052] Specifically, the latch member 65 and the outer rod 62 are preferably, but not limited to, frictionally matched, and the friction force can offset the gravity of the latch member 65 to prevent the latch member 65 from falling off from the outer rod 62 under the action of gravity.

[0053] like Figure 4As shown, there is a gap between the annular side wall of the operating groove 213 and the outer side wall of the screw head 43, and the outer rod 62 and the bevel plate 63 are located within the gap after rotation.

[0054] Specifically, the movement of the latch member 65 away from the axis of the motor shaft is outward movement, and the latch member 65 is moved inward so that the latch member 65 is separated from the slot 64, and then the outer rod 62 can be rotated to the ring side wall close to the operating slot 213 to facilitate the disassembly and assembly of the adjusting rod 4; after the adjusting rod 4 is installed into the square shaft 2, the outer rod 62 is rotated so that the bevel plate 63 abuts against the slope in the groove 44, and then the latch member 65 is moved outward so that the latch member 65 is inserted into the slot 64. In this way, the outer rod 62 and the inner rod 61 form an integral fastener 6 through the latch member 65. After the motor shaft rotates, the fastener 6 can move outward as a whole under the action of centrifugal force to prevent the adjusting rod 4 from moving rightward and loosening.

[0055] Working principle: when assembling the motor shaft and the rotor, the abutment plate 3 is inserted on the square shaft 2, the outer rod 62 is rotated to the side wall of the ring close to the operating groove 213, the adjusting rod 4 is installed into the square shaft 2 and tightened, and the adjusting rod 4 moves to the left when being tightened, and drives the abutment plate 3 to move outward through the conical ring 5, and the outward movement distance of the abutment plate 3 is adjusted by adjusting the screwing degree of the adjusting rod 4 until the abutment plate 3 after outward movement is matched with the rectangular groove in the rotor; after adjusting the abutment plate 3, the outer rod 62 is rotated until the bevel plate 63 abuts against the slope in the groove 44, and then the latch member 65 is moved outward so that the latch member 65 is inserted into the slot 64, so that the outer rod 62 and the inner rod 61 form an integral fastener 6 through the latch member 65, and the fastener 6 abuts against the groove 44, which can prevent the adjusting rod 4 from moving right and loosening.

[0056] During the operation of the motor shaft, the motor shaft rotates rapidly, and the fastener 6 has a tendency to move outward under the action of centrifugal force, which can further improve the effect of preventing the adjusting rod 4 from moving rightward and loosening, and can improve the effect of the interference fit between the motor shaft and the rotor. Moreover, this process is automatically performed as the motor shaft works, and no manual operation is required. By providing a rotatable and fixed fastener 6, it is convenient to disassemble and assemble the adjusting rod 4, and it is also convenient to adjust the abutment plate 3, and it is easy to use. Therefore, the motor shaft not only has the function of automatically adjusting the fitting relationship after wear, thereby improving the assembly effect of the motor shaft and the rotor, but also is easy to disassemble and assemble, and has a better use effect.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A square motor shaft for a vacuum pump, characterized in that: The invention comprises a main shaft (1) and a square shaft (2), wherein the longitudinal section of the main shaft (1) is circular, the longitudinal section of the square shaft (2) is rectangular, the square shaft (2) and the main shaft (1) are located on the same axis, the square shaft (2) is used to be connected to a rotor, and a rectangular groove corresponding to the square shaft (2) is provided in the rotor; Abutment plates (3) are movably inserted on the four side walls of the square shaft (2), and the abutment plates (3) are provided with guide rods (31) inserted into the interior of the square shaft (2); The square shaft (2) is provided with a mounting groove (21), an adjusting rod (4) is movably provided in the mounting groove (21), the mounting groove (21), the adjusting rod (4) and the motor shaft are coaxial, a cone ring (5) is provided on the adjusting rod (4), and after the adjusting rod (4) moves, the guide rod (31) is driven to move outwards through the cone ring (5); The adjusting rod (4) comprises: A main rod (41), wherein the longitudinal section of the main rod (41) is circular, the main rod (41) comprises a thick rod and a thin rod, and the cone ring (5) has the same outer diameter as the thick rod; A threaded rod (42) and a screw head (43) are respectively arranged at both ends of the main rod (41); a thread groove (211) corresponding to the threaded rod (42) is arranged inside the square shaft (2); and the screw head (43) is polygonal in shape; The assembly groove (21) comprises a thread groove (211), a limiting groove (212) and an operating groove (213); the threaded rod (42) is threadedly connected to the thread groove (211); the main rod (41) and the cone ring (5) are located in the limiting groove (212); the screw rod head (43) is located in the operating groove (213); and the outer diameters of the thread groove (211), the limiting groove (212) and the operating groove (213) increase in sequence; The adjusting rod (4) further comprises a groove (44) provided on the screw head (43), the side wall of the groove (44) being in a slope shape, a plurality of recesses (22) being provided on the annular side wall of the operating groove (213), a fastener (6) being movably inserted in the recess (22), an end of the fastener (6) close to the axis of the adjusting rod (4) being inserted into the groove (44), and a tension spring (7) being provided in the recess (22) for driving the fastener (6) away from the axis of the adjusting rod (4); The fasteners (6) are distributed along the radial direction of the adjusting rod (4), and the fasteners (6) include: an inner rod (61) movably inserted into the sink (22), the inner rod (61) extending to the outside of the sink (22); An outer rod (62) hingedly connected to the inner rod (61); a bevel plate (63) fixedly connected to the outer rod (62), the bevel plate (63) being inserted into the groove (44); A clamping groove (64) provided at the end of the inner rod (61); A latch member (65) is movably inserted into the outer rod (62), and an end of the latch member (65) is inserted into the slot (64).

2. A vacuum pump square motor shaft according to claim 1, characterized in that: Two guide rods (31) are provided on the abutment plate (3), and two cone rings (5) are provided on the adjustment rod (4).

3. A square motor shaft for a vacuum pump according to claim 2, characterized in that: A spacing is left between the annular side wall of the operating groove (213) and the outer side wall of the screw head (43), and the outer rod (62) and the bevel plate (63) are located within the spacing after being rotated.

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