Vacuum pump with backlash compensation function

Abstract

The utility model relates to the field of electric vacuum pumps, in particular to a vacuum pump with a clearance compensation function. A vacuum pump with a clearance compensation function comprises a shell, a motor, a crankshaft assembly, a fulcrum bearing and a floating assembly. Wherein the crankshaft assembly is arranged in the shell, an output shaft of the motor extends into the shell and is fixedly connected with one end of the crankshaft assembly, the section, deviating from the motor, of the crankshaft assembly is connected with the floating assembly through a fulcrum bearing, the floating assembly is in floating connection with the inner wall of the box body, and the floating direction of the floating assembly is perpendicular to the axis direction of the output shaft of the motor. According to the vacuum pump with the clearance compensation function, the problems in the prior art can be solved, the radial position of the section, deviating from the motor, of the crankshaft assembly can be automatically adjusted in the assembling process of the crankshaft assembly, and a rotating shaft of the crankshaft assembly and an output shaft of the motor are always located on the same straight line.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric vacuum pump field, especially in a kind of vacuum pump with gap compensation function. BACKGROUND

[0002] Electric vacuum pump (Electric Vacuum Pump, EVP) is a kind of through electric drive to generate, maintain or enhance vacuum environment device. It is extracted by mechanical or physical way gas in closed space, to form the vacuum state lower than atmospheric pressure.

[0003] In prior art, when three connecting rod piston assemblies, i.e. connecting rod piston assembly one, connecting rod piston assembly two and connecting rod piston assembly three are assembled to crankshaft assembly are determined, with the loading of left motor, the crankshaft assembly will be caused by cumulative tolerance or assembly process to have axial relative shift in right side end surface, in other words, when the crankshaft assembly is not assembled with other components, the crankshaft assembly is horizontally arranged, once the left side of the crankshaft assembly is connected with the motor, due to cumulative tolerance or assembly process, the right side of the crankshaft assembly is prone to be raised, the direction of raising is perpendicular to the extension direction of the output shaft of the motor, that is, radial raising, which makes the rotating shaft of the crankshaft assembly not in the same straight line with the output shaft of the motor, this condition is called the eccentric shaft phenomenon of the crankshaft assembly;This will cause excessive load of the motor and unable to work;If forcibly corrected, that is, forcibly straighten the right end of the crankshaft assembly, so that the rotating shaft of the crankshaft assembly is in the same straight line with the output shaft of the motor, but this will force the three connecting rod piston assemblies to be eccentric wear with the corresponding cylinder hole, or cause the crankshaft assembly and the driving motor to be stressed on one side, or make the crankshaft assembly be subjected to continuous correction shear stress and have poor strength, unnecessary vibration and reduce the service life of bearing.

[0004] Therefore, the technical problem existing in prior art is how to provide a vacuum pump with gap compensation function, which can automatically adjust the radial position of the section of the crankshaft assembly away from the motor during assembly process, so that the rotating shaft of the crankshaft assembly is always in the same straight line with the output shaft of the motor. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned defects in prior art, and provides a vacuum pump with gap compensation function.

[0006] To achieve the above-mentioned utility model purposes, the utility model adopts the following technical solutions:

[0007] A vacuum pump with gap compensation function, comprising a shell, a motor, a crankshaft assembly, a fulcrum bearing and a floating assembly.

[0008] The crankshaft assembly is arranged in the shell, the output shaft of the motor extends into the shell and is fixedly connected with one end of the crankshaft assembly, and the section of the crankshaft assembly away from the motor is connected with the floating assembly through the fulcrum bearing, and the floating assembly is floatingly connected with the inner wall of the shell, and the floating direction is perpendicular to the axis direction of the output shaft of the motor.

[0009] Further, the first inner wall and the second inner wall are arranged in the shell, the first inner wall and the second inner wall are parallel to each other, the extension direction of the first inner wall and the second inner wall is along the axis direction of the output shaft of the motor, and the combination of the crankshaft assembly, the fulcrum bearing and the floating assembly is located between the first inner wall and the second inner wall.

[0010] The floating assembly comprises a support disc, a support plate, a first fastener and a second fastener, and a floating sealing ring.

[0011] The support plate is provided with a first circular hole, the support disc is provided with an axially-through first threaded hole, the screw rod of the first fastener passes through the first circular hole and is threadedly connected with the first threaded hole, the outer surface of the screw rod of the first fastener is in clearance fit with the hole wall of the first circular hole, and the head of the first fastener is limited outside the support plate, the support disc and the shell.

[0012] The support plate is further provided with a second circular hole, the side wall of the shell is provided with a second threaded hole corresponding to the second circular hole, the screw rod of the second fastener passes through the second circular hole and is threadedly connected with the second threaded hole, the outer surface of the screw rod of the second fastener is in clearance fit with the hole wall of the second circular hole, and the head of the second fastener is limited outside the support plate, the support disc and the shell.

[0013] The axis of the support disc is parallel to or coincides with the axis of the output shaft of the motor, the floating sealing ring is sleeved on the support disc, and along the radial direction of the support disc, the floating sealing ring is clamped by the circumferential outer surface of the support disc and the first inner wall of the shell.

[0014] The support disc is further provided with a connecting hole penetrating in the axial direction, the bearing inner ring of the fulcrum bearing is sleeved and fixed on the section of the crankshaft assembly away from the motor, and the bearing outer ring of the fulcrum bearing is connected with the hole wall of the connecting hole in interference fit.

[0015] Further, the first sealing ring is arranged between the bearing outer ring of the fulcrum bearing and the hole wall of the connecting hole.

[0016] Further, the second sealing ring is arranged between the support disc and the support plate.

[0017] Further, a plurality of weight-removing grooves are arranged on the disc body of the support disc, and the weight-removing grooves are formed by removing part of the material of the support disc.

[0018] Further, the plurality of weight-removing grooves are arranged equidistantly around the center of the support disc.

[0019] Further, the crankshaft assembly comprises a crank, the crank is connected with the output shaft of the motor;

[0020] The crankshaft assembly further comprises a first counterweight, a first section of the crank is towards the motor, and the first counterweight is integrally formed with the first section;

[0021] The crankshaft assembly further comprises a second counterweight, a second section of the crank is away from the motor, and the second counterweight is detachably connected with the second section;

[0022] The second counterweight is provided with a connecting portion at an end away from the crank, and the bearing inner ring of the fulcrum bearing is sleeved on the connecting portion and connected with the connecting portion in interference fit.

[0023] Further, the outer surface of the second section of the crank is provided with a first step, and a first section of the second counterweight is provided with a second step, the first step and the second step are parallel to each other;

[0024] Further, the first step and the second step are parallel to each other.

[0025] Further, the first step and the second step are parallel to each other.

[0026] Further, the first step and the second step are parallel to each other.

[0027] Further, the first fastener and the second fastener are respectively a screw or a bolt.

[0028] Compared with the prior art, the advantages of the utility model lie in that:

[0029] Firstly, in the utility model, the section of the crankshaft assembly away from the motor is connected with the floating assembly through the fulcrum bearing, the floating assembly is floatingly connected with the inner wall of the box body, and when the section of the crankshaft assembly away from the motor is axially offset [0-X, 0+Y, 0+Z] due to cumulative tolerance or assembly process, i.e. the X coordinate of the section of the crankshaft assembly away from the motor does not change, and the section is radially offset in the Y direction and the Z direction, firstly, the internal radial clearance of the fulcrum bearing supplements the first part of the clearance, then the radial fit clearance of the fulcrum bearing and the supporting disc supplements the second part of the clearance, and finally the radial fit clearance of the supporting plate and the shell supplements the third part of the clearance, the above-mentioned three clearances are supplemented by at least one of them, so that the rotation axis of the crankshaft assembly is always on the same straight line as the output shaft of the motor, thereby solving the technical problems existing in the prior art.

[0030] Second, in the utility model, the floating sealing ring is sleeved on the supporting disc, and is clamped by the circumferential outer surface of the supporting disc and the first inner wall of the shell along the radial direction of the supporting disc; the floating sealing ring is arranged between the circumferential outer surface of the supporting disc and the first inner wall of the shell, thereby forming a radial damping effect on the supporting disc, and a counteracting effect on the radial displacement of the supporting disc is formed, so that the initial gap adjustment of the supporting disc is effective, and the adjustment is not invalid after a period of operation; the floating sealing ring has the ability to be extruded and deformed, one side of the floating sealing ring is extruded and the volume is reduced, and the extruded part moves towards the large gap position; for example, the crankshaft assembly deviates from the motor and is upwardly bent, the gap between the supporting disc and the first inner wall is reduced, a part of the floating sealing ring between the supporting disc and the first inner wall is extruded and deformed to reduce the cross-sectional area, the volume of the deformed part flows to the bottom of the supporting disc, and the upward bending of the crankshaft assembly deviating from the motor causes the gap between the bottom of the supporting disc and the second inner wall to increase, the increased gap is filled by the part of the floating sealing ring between the bottom of the supporting disc and the second inner wall, and the air tightness between the supporting disc and the first inner wall and the second inner wall is ensured, thereby ensuring the vacuum degree of the vacuum pump.

[0031] Third, the vacuum pump with the gap compensation function of the utility model further comprises a first sealing ring, the first sealing ring is arranged between the bearing outer ring of the fulcrum bearing and the hole wall of the connecting hole; and the first sealing ring is used for ensuring the air tightness between the bearing outer ring of the fulcrum bearing and the hole wall of the connecting hole.

[0032] Fourth, the vacuum pump with the gap compensation function of the utility model further comprises a second sealing ring, the second sealing ring is arranged between the supporting disc and the supporting plate; and the second sealing ring is used for ensuring the air tightness between the supporting disc and the supporting plate.

[0033] Fifth, the vacuum pump with the gap compensation function of the utility model, a plurality of weight-removing grooves are arranged on the disc body of the supporting disc, and the weight-removing grooves are formed by removing part of the material of the supporting disc; the plurality of weight-removing grooves are arranged on the supporting disc, so that the weight of the supporting disc is reduced as much as possible. Preferably, the plurality of weight-removing grooves are equidistantly arranged around the center of the supporting disc; so that the center of gravity of the supporting disc is always kept at the geometric center thereof.

[0034] Sixth, the first counterweight block and the first section of the crank are integrally machined and formed in the utility model, and the second counterweight block is detachably connected with the second section of the crank, so that the process steps required for assembly are reduced and assembly parts are saved.

[0035] Seventh, in the utility model, the two ends of the first nest are respectively abutted with the first step and the second step, that is, the first nest is limited in the axial direction by the first step and the second step, so that the assembly axial precision of the first nest is ensured, and axial movement of the first nest caused by vibration in the use process is avoided.

[0036] Eight, in the utility model, first nest radial first limit surface is provided, second counterweight is along the radial second limit surface is provided, along the axial direction of bearing three, bearing three is limited between first limit surface and second limit surface. In the utility model, along the axial direction of bearing three, bearing three is limited by first limit surface and second limit surface, guarantee the axial assembly precision of bearing three, also avoid the axial movement of bearing three by the vibration effect in the use process. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 It is the structure section view schematic diagram of vacuum pump with gap compensation function of the utility model;

[0038] Figure 2 It is Figure 1 The structure enlarged schematic diagram of region I in it;

[0039] Figure 3 It is the structure schematic diagram of support plate;

[0040] Figure 4 It is the structure schematic diagram of support plate;

[0041] Figure 5 It is the structure schematic diagram of crankshaft assembly.

[0042] Mark in the drawing: housing (1), motor (2), crankshaft assembly (3), fulcrum bearing (4), floating assembly (5), first inner wall (6), second inner wall (7), support plate (8), support plate (9), first fastener (10), second fastener (11), floating seal ring (12), first circular hole (13), second circular hole (14), first threaded hole (15), connecting hole (16), first seal ring (17), second seal ring (18), weight-removing groove (19), crank (20), first counterweight (21), first section (22), second counterweight (23), second section (24), connecting part (25), first step (26), second step (27), first nest (28), connecting rod piston assembly three (29), bearing three (30), first limit surface (31), second limit surface (32). DETAILED DESCRIPTION

[0043] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length h," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment proposes a vacuum pump with clearance compensation function, which includes a housing 1, a motor 2, a crankshaft assembly 3, a pivot bearing 4, and a floating assembly 5. The crankshaft assembly 3 is disposed inside the housing 1, the output shaft of the motor 2 extends into the housing 1 and is fixedly connected to one end of the crankshaft assembly 3, and the section of the crankshaft assembly 3 away from the motor 2 is connected to the floating assembly 5 through the pivot bearing 4. The floating assembly 5 is floatingly connected to the inner wall of the housing, and its floating direction is perpendicular to the axial direction of the output shaft of the motor 2.

[0046] The housing 1 includes a box body and a cover that is fastened to the box body, which are existing technologies and will not be described in detail here.

[0047] Motor 2 provides power to crankshaft assembly 3. The output shaft of motor 2 drives crankshaft assembly 3 to rotate synchronously, which in turn drives connecting rod piston assembly 1, connecting rod piston assembly 2, and connecting rod piston assembly 3 29 mounted on crankshaft assembly 3 to reciprocate up and down. The direction perpendicular to the axis of the motor output shaft is defined as radial.

[0048] The pivot bearing 4 may be one of the bearings in the prior art, such as a ball bearing, and there is no limitation.

[0049] like Figures 1-4As shown, the floating assembly 5 is connected with the inner wall of the box along the radial direction, specifically, the housing 1 is provided with a first inner wall 6 and a second inner wall 7, the first inner wall 6 and the second inner wall 7 are parallel to each other, the extension direction of the first inner wall 6 and the second inner wall 7 is along the axis direction of the output shaft of the motor 2, the combination of the crankshaft assembly 3, the fulcrum bearing 4 and the floating assembly 5 is located between the first inner wall 6 and the second inner wall 7; the floating assembly 5 includes a support disc 8, a support plate 9, a first fastener 10 and a second fastener 11, and a floating sealing ring 12; the support plate 9 is provided with a first circular hole 13, the support disc 8 is provided with an axially penetrating first threaded hole 15, the screw rod of the first fastener 10 penetrates through the first circular hole 13 and is threadedly connected with the first threaded hole 15, the outer surface of the screw rod of the first fastener 10 is in clearance fit with the hole wall of the first circular hole 13, and the head of the first fastener 10 is limited outside the support plate 9, the support disc 8 and the housing 1; the support plate 9 is further provided with a second circular hole 14, the side wall of the housing 1 is provided with a second threaded hole corresponding to the second circular hole 14, the screw rod of the second fastener 11 penetrates through the second circular hole 14 and is threadedly connected with the second threaded hole, the outer surface of the screw rod of the second fastener 11 is in clearance fit with the hole wall of the second circular hole 14, and the head of the second fastener 11 is limited outside the support plate 9, the support disc 8 and the housing 1; the axis of the support disc 8 is parallel to or coincides with the axis of the output shaft of the motor 2, the floating sealing ring 12 is sleeved on the support disc 8, along the radial direction of the support disc 8, the floating sealing ring 12 is clamped by the circumferential outer surface of the support disc 8 and the first inner wall 6 of the outer shell; the support disc 8 is further provided with an axially penetrating connecting hole 16, the bearing inner ring of the fulcrum bearing 4 is sleeved and fixed on the section of the crankshaft assembly 3 away from the motor 2, and the bearing outer ring of the fulcrum bearing 4 is connected in interference fit with the hole wall of the connecting hole 16. Specifically, the first fastener 10 and the second fastener 11 are respectively screws or bolts.

[0050] The support disc 8 is in ring disc structure, the support plate 9 is in plate structure, the connection mode of the support disc 8 and the support plate 9 enables the support disc 8 to be radially floating relative to the support plate 9, the principle is that the screw rod of the first fastener 10 is threadedly connected with the first threaded hole 15 of the support disc 8, so that the support disc 8 and the first fastener 10 cannot be radially floating, and the screw rod of the first fastener 10 penetrates through the first circular hole 13 on the support plate 9, and the outer surface of the screw rod of the first fastener 10 has clearance with the hole wall of the first circular hole 13, so that the screw rod of the first fastener 10 can be radially floating relative to the first circular hole 13, and further causes the support disc 8 connected with the first fastener 10 to be radially floating relative to the support plate 9 where the first circular hole 13 is located.

[0051] Similarly, the support plate 9 and the housing 1 are also radially floating, and the principle is similar to the above principle, which will not be described herein.

[0052] In the prior art, when the three connecting rod piston assemblies, i.e. connecting rod piston assembly one, connecting rod piston assembly two and connecting rod piston assembly three, are assembled to the crankshaft assembly, the crankshaft assembly will be axially offset at the right end face due to accumulated tolerances or assembly process as the left motor is installed. In other words, when the crankshaft assembly is not assembled with other components, the crankshaft assembly is horizontally arranged. Once the left side of the crankshaft assembly is connected with the motor, the right side of the crankshaft assembly will be easily tilted due to accumulated tolerances or assembly process. The tilting direction is perpendicular to the extension direction of the output shaft of the motor, i.e. radial tilting. This makes the rotation axis of the crankshaft assembly not in line with the output shaft of the motor, which is called the off-axis phenomenon of the crankshaft assembly. This will cause excessive load of the motor and the motor cannot work. If the right end of the crankshaft assembly is forcibly straightened to make the rotation axis of the crankshaft assembly in line with the output shaft of the motor, the three connecting rod piston assemblies will be abnormally worn or even air leakage with the corresponding cylinder holes, or the crankshaft assembly will be subjected to one-sided stress of the driving motor, or the strength of the crankshaft assembly will be deteriorated due to the continuous correction of shear stress, unnecessary vibration will occur and the service life of the bearing will be reduced.

[0053] Therefore, the technical problem existing in the prior art is how to provide a vacuum pump with a gap compensation function, which can automatically adjust the radial position of the section of the crankshaft assembly away from the motor during the assembly process, so that the rotation axis of the crankshaft assembly is always in line with the output shaft of the motor.

[0054] In the embodiment, the section of the crankshaft assembly 3 away from the motor 2 is connected with the floating assembly 5 through the fulcrum bearing 4, and the floating assembly 5 is floatingly connected with the inner wall of the housing. For example, when the section of the crankshaft assembly 3 away from the motor 2 is axially offset [0-X, 0+Y, 0+Z] due to accumulated tolerances or assembly process, i.e. the X coordinate of the section of the crankshaft assembly 3 away from the motor 2 does not change, and the radial offset is in the Y direction and the Z direction, first, the internal radial clearance of the fulcrum bearing 4 supplements the first part of the gap, then the radial fit clearance between the fulcrum bearing 4 and the support disc 8 supplements the second part of the gap, and finally the radial fit clearance between the support plate 9 and the housing 1 supplements the third part of the gap. The above three gaps are supplemented by at least one of them, so that the rotation axis of the crankshaft assembly 3 is always in line with the output shaft of the motor 2, thereby solving the technical problem existing in the prior art.

[0055] Further, the floating sealing ring 12 is sleeved on the support disc 8, and is clamped by the circumferential outer surface of the support disc 8 and the first inner wall 6 of the shell along the radial direction of the support disc 8. The floating sealing ring 12 arranged between the circumferential outer surface of the support disc 8 and the first inner wall 6 of the shell can form radial damping effect on the support disc 8, and the radial displacement of the support disc 8 is resisted, so that the initial gap adjustment of the support disc 8 is effective, and the adjustment is not invalid after a period of operation. Further, the floating sealing ring 12 itself has the ability to be extruded and deformed. When one side of the floating sealing ring 12 is extruded and the volume is reduced, the extruded volume will move towards the large gap position. For example, the crankshaft assembly 3 deviates from the motor 2 and is upwardly bent, so that the gap between the support disc 8 and the first inner wall 6 is reduced, and the part of the floating sealing ring 12 between the support disc 8 and the first inner wall 6 is extruded and deformed to reduce the cross-sectional area. The volume of the deformed part will flow to the bottom of the support disc 8, and the upward bending of the crankshaft assembly 3 deviating from the motor 2 will cause the gap between the bottom of the support disc 8 and the second inner wall 7 to increase. The increased gap is filled by the part of the floating sealing ring 12 between the bottom of the support disc 8 and the second inner wall 7, so as to ensure the air tightness between the support disc 8 and the first inner wall 6 and the second inner wall 7, and the vacuum degree of the vacuum pump is ensured.

[0056] Further, the vacuum pump with the gap compensation function of the embodiment further comprises a first sealing ring 17 arranged between the bearing outer ring of the fulcrum bearing 4 and the hole wall of the connecting hole 16. The first sealing ring 17 is used to ensure the air tightness between the bearing outer ring of the fulcrum bearing 4 and the hole wall of the connecting hole 16.

[0057] Further, the vacuum pump with the gap compensation function of the embodiment further comprises a second sealing ring 18 arranged between the support disc 8 and the support plate 9. The second sealing ring 18 is used to ensure the air tightness between the support disc 8 and the support plate 9.

[0058] Further, the vacuum pump with the gap compensation function of the embodiment comprises a plurality of weight-removing grooves 19 arranged on the disc body of the support disc 8. The weight-removing grooves 19 are formed by removing part of the material of the support disc 8. In the embodiment, a plurality of weight-removing grooves 19 are arranged on the support disc 8 to reduce the weight of the support disc 8 as much as possible. Preferably, the plurality of weight-removing grooves 19 are equidistantly arranged around the center of the support disc 8, so that the center of gravity of the support disc 8 is always at the geometric center thereof.

[0059] Further, the crankshaft assembly 3 comprises a crank 20 connected with the output shaft of the motor 2; the crankshaft assembly 3 further comprises a first counterweight 21, a first section 22 of the crank 20 towards the motor 2 is integrally formed with the first counterweight 21; the crankshaft assembly 3 further comprises a second counterweight 23, a second section 24 of the crank 20 away from the motor 2 is detachably connected with the second counterweight 23, the detachable connection mode of the second counterweight 23 and the second section 24 is not limited in the prior art; an end of the second counterweight 23 away from the crank 20 is provided with a connecting portion 25, the bearing inner ring of the fulcrum bearing 4 is sleeved on the connecting portion 25 and is connected with the connecting portion 25 in an interference fit.

[0060] In the embodiment, the first counterweight 21 is integrally formed with the first section 22 of the crank 20, and the second counterweight 23 is detachably connected with the second section 24 of the crank 20, thereby reducing the process steps required for assembly and saving assembly parts.

[0061] As shown in Figure 1 , Figure 2 , Figure 5 Further, an outer surface of the second section 24 of the crank 20 is provided with a first step 26, a section of the second counterweight 23 towards the crank 20 is provided with a second step 27, the first step 26 and the second step 27 are parallel to each other; further comprising a first nest 28, the first nest 28 is sleeved on the second section 24 and the second counterweight 23 at the same time, along the axial direction of the first nest 28, the first nest 28 is limited between the first step 26 and the second step 27, and the two ends of the first nest 28 respectively abut against the first step 26 and the second step 27; further comprising a connecting rod piston assembly three 29, a bearing three 30 of the connecting rod piston assembly three 29 is sleeved on the outer ring of the first nest 28.

[0062] In the embodiment, the two ends of the first nest 28 respectively abut against the first step 26 and the second step 27, that is, the first nest 28 is limited in the axial direction by the first step 26 and the second step 27, which guarantees the axial assembly accuracy of the first nest 28 and also avoids axial movement of the first nest 28 due to vibration during use.

[0063] Further, the first nest 28 is provided with a first limiting surface 31 in the radial direction, the second counterweight 23 is provided with a second limiting surface 32 in the radial direction, along the axial direction of the bearing three 30, the bearing three 30 is limited between the first limiting surface 31 and the second limiting surface 32. In the embodiment, along the axial direction of the bearing three 30, the bearing three 30 is limited by the first limiting surface 31 and the second limiting surface 32, which guarantees the axial assembly accuracy of the bearing three 30 and also avoids axial movement of the bearing three 30 due to vibration during use.

[0064] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several deformations and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A vacuum pump with a gap compensation function, characterized by, The shell (1), motor (2), crankshaft assembly (3), fulcrum bearing (4), floating assembly (5); Wherein, the crankshaft assembly (3) is arranged in the shell (1), the output shaft of the motor (2) extends into the shell (1) and is fixedly connected with one end of the crankshaft assembly (3), the section of the crankshaft assembly (3) away from the motor (2) is connected with the floating assembly (5) through the fulcrum bearing (4), the floating assembly (5) is floatingly connected with the inner wall of the box, and the floating direction is perpendicular to the axis direction of the output shaft of the motor (2).

2. The vacuum pump with a gap compensation function according to claim 1, characterized in that, The first inner wall (6) and the second inner wall (7) are arranged in the shell (1), the first inner wall (6) and the second inner wall (7) are parallel to each other, the extension direction of the first inner wall (6) and the second inner wall (7) is along the axis direction of the output shaft of the motor (2), and the combination of the crankshaft assembly (3), the fulcrum bearing (4) and the floating assembly (5) is located between the first inner wall (6) and the second inner wall (7). The floating assembly (5) comprises a support disc (8), a support plate (9), a first fastener (10) and a second fastener (11), and a floating sealing ring (12). The first circular hole (13) is arranged on the support plate (9), the support disc (8) is provided with an axially-through first threaded hole (15), the screw rod of the first fastener (10) passes through the first circular hole (13) and is threadedly connected with the first threaded hole (15), the outer surface of the screw rod of the first fastener (10) is in clearance fit with the hole wall of the first circular hole (13), and the head of the first fastener (10) is limited outside the support plate (9), the support disc (8) and the shell (1). The second circular hole (14) is further arranged on the support plate (9), the side wall of the shell (1) is provided with a second threaded hole corresponding to the second circular hole (14), the screw rod of the second fastener (11) passes through the second circular hole (14) and is threadedly connected with the second threaded hole, the outer surface of the screw rod of the second fastener (11) is in clearance fit with the hole wall of the second circular hole (14), and the head of the second fastener (11) is limited outside the support plate (9), the support disc (8) and the shell (1). The axis of the support disc (8) is parallel to or coincides with the axis of the output shaft of the motor (2), the floating sealing ring (12) is sleeved on the support disc (8), and along the radial direction of the support disc (8), the floating sealing ring (12) is clamped by the circumferential outer surface of the support disc (8) and the first inner wall (6) of the shell. The support disc (8) is further provided with an axially-through connecting hole (16), the bearing inner ring of the fulcrum bearing (4) is sleeved and fixed on the section of the crankshaft assembly (3) away from the motor (2), and the bearing outer ring of the fulcrum bearing (4) is connected with the hole wall of the connecting hole (16) in interference fit.

3. The vacuum pump with gap compensation function according to claim 2, characterized in that, The first sealing ring (17) is further arranged between the bearing outer ring of the fulcrum bearing (4) and the hole wall of the connecting hole (16).

4. The vacuum pump with gap compensation function according to claim 2, characterized in that, The second sealing ring (18) is further arranged between the support disc (8) and the support plate (9).

5. The vacuum pump with gap compensation function according to claim 2, characterized in that, The disc body of the support disc (8) is provided with a plurality of weight-removing grooves (19), and the weight-removing grooves (19) are formed by removing part of the material of the support disc (8).

6. The vacuum pump with gap compensation function according to claim 5, characterized in that, A plurality of deduplication slots (19) are arranged equidistantly around the center of the support disc (8).

7. The vacuum pump with gap compensation function according to any one of claims 2 to 6, characterized in that, The crankshaft assembly (3) comprises a crank (20) connected with the output shaft of the motor (2); The crankshaft assembly (3) further comprises a first counterweight (21), and a first section (22) of the crank (20) is towards the motor (2); The crankshaft assembly (3) further comprises a second counterweight (23), and a second section (24) of the crank (20) is away from the motor (2); The second counterweight (23) is provided with a connecting portion (25) away from the crank (20), and the bearing inner ring of the fulcrum bearing (4) is sleeved on the connecting portion (25) and connected with the connecting portion (25) in interference fit.

8. The vacuum pump with gap compensation function according to claim 7, characterized in that, The second section (24) of the crank (20) is provided with a first step (26) on the outer surface, and a second step (27) is arranged on a section of the second counterweight (23) towards the crank (20), and the first step (26) and the second step (27) are parallel to each other; Further comprising a first nest (28), the first nest (28) is sleeved on the second section (24) and the second counterweight (23) at the same time, along the axial direction of the first nest (28), the first nest (28) is limited between the first step (26) and the second step (27), and the two ends of the first nest (28) are respectively abutted with the first step (26) and the second step (27); Further comprising a connecting rod piston assembly three (29), a bearing three (30) of the connecting rod piston assembly three (29) is sleeved on the outer ring of the first nest (28).

9. The vacuum pump with gap compensation function according to claim 8, characterized in that, The first nest (28) is provided with a first limiting surface (31) in the radial direction, the second counterweight (23) is provided with a second limiting surface (32) in the radial direction, and along the axial direction of the bearing three (30), the bearing three (30) is limited between the first limiting surface (31) and the second limiting surface (32).

10. The vacuum pump with a gap compensation function according to claim 2, characterized by, The first fastener (10) and the second fastener (11) are respectively screws or bolts.

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