A fixture for evenly dividing the gap between the stator and rotor of an electronic vacuum pump

Abstract

The present invention provides a fixture for evenly dividing the gap between the stator and rotor of an electronic vacuum pump. The vacuum pump includes a motor, a lower cover plate, a stator, and a rotor. The motor is provided with a flange, the lower cover plate is mounted on the flange, the stator is mounted on the lower cover plate, the flange is provided with threaded holes, the lower cover plate and the stator are provided with bolt holes corresponding to the positions of the threaded holes of the flange, and the motor shaft passes through the axial holes of the flange, the lower cover plate, the stator, and the rotor in sequence; the stator is provided with an air intake groove and an elliptical inner cavity for accommodating the rotor; the fixture includes an evenly dividing frame and four positioning rods, the evenly dividing frame is a cross-shaped frame as a whole, a positioning sleeve is provided in the middle, and four through holes corresponding to the threaded holes of the flange are provided on the outer periphery; the evenly dividing frame is fixed to the end of the motor shaft through the positioning sleeve, and the four positioning rods pass through the through hole of the evenly dividing frame and the bolt holes on the stator and the lower cover plate respectively and are inserted into the threaded holes of the flange. Thus, the radial gap between the stator and the rotor can be evenly divided.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pumps, and in particular to a clamp for equally dividing the gap between a stator and a rotor of an electronic vacuum pump. Background Art

[0002] The electronic vacuum pump is the main component of the brake assist system on the car. The braking system on the car chassis is crucial to the safety of car driving. However, the assembly of the electronic vacuum pump requires adjustment of the radial clearance between the stator, rotor and stator.

[0003] The driving source of the electronic vacuum pump is the motor. After power is turned on, the motor rotates, and the motor shaft drives the rotor to rotate through torque. The rotor drives the blades to rotate to extract the vacuum. Since the rotor rotates in the stator cavity, a very small gap must be formed between the rotor periphery and the stator cavity side wall, and the control of this gap requires strict requirements. However, when designing the parts, the size of this gap is determined by the outer diameter of the rotor and the elliptical inner cavity of the stator, and the inner cavity of the stator is a centrally symmetrical structure, so the gap between the rotor and the stator also needs to be evenly divided. Summary of the invention

[0004] The purpose of the present invention is to provide a fixture for evenly dividing the gap between the stator and rotor of an electronic vacuum pump in order to solve the above-mentioned problem. The fixture can evenly distribute the radial gap between the stator and the rotor on the same axis so that the rotor will not cause friction and reduce its service life due to too small a gap between the circumference and the side wall of the stator inner cavity; nor will the leakage increase and affect the performance due to too large a gap between the circumference and the stator inner cavity.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a fixture for evenly dividing the gap between the stator and rotor of an electronic vacuum pump, the vacuum pump comprising a motor, a lower cover plate, a stator and a rotor, the motor being provided with a flange, the lower cover plate being mounted on the flange, the stator being mounted on the lower cover plate, the flange being provided with threaded holes, the lower cover plate and the stator being provided with bolt through holes corresponding to the positions of the threaded holes of the flange, the motor shaft passing through the axial holes of the flange, the lower cover plate, the stator and the rotor in sequence; the rotor being provided with a blade slot; the stator being provided with an air intake slot and an elliptical inner cavity for accommodating the rotor; the fixture comprising an evenly dividing frame and four positioning rods, the evenly dividing frame being cross-shaped as a whole, a positioning sleeve being provided in the middle thereof, and four through holes corresponding to the threaded holes of the flange being provided on the outer periphery; the evenly dividing frame being fixed to the end of the motor shaft by the positioning sleeve, and the four positioning rods respectively passing through the through holes of the evenly dividing frame and the bolt through holes on the stator and the lower cover plate and being inserted into the threaded holes of the flange.

[0006] Preferably, the neck of the positioning rod is a cone.

[0007] Preferably, the through holes on the equal distribution frame are countersunk holes.

[0008] Furthermore, a positioning pin is provided on the flange, and a positioning hole is provided on the lower cover plate.

[0009] The method of using the present invention is as follows: align the positioning sleeve on the equal distribution frame with the motor shaft, pass four positioning rods through the four through holes around the equal distribution frame, align them with the four bolt through holes around the stator, and slowly press down with force. Then, the stator will automatically adjust to a position with the motor shaft as the geometric center under the restriction of the positioning rods and the positioning sleeve, so as to achieve the purpose of equal distribution of the gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the explosion structure of the vacuum pump and the clamp in the embodiment of the present invention;

[0011] Figure 2 It is an overall top view of the vacuum pump and the fixture after installation in the embodiment of the present invention;

[0012] Figure 3 for Figure 1 The top view of the motor in

[0013] Figure 4 for Figure 1 A top view of the lower cover plate in FIG.

[0014] Figure 5 for Figure 1 The top view of the rotor in ;

[0015] Figure 6 for Figure 1 The stator top view in FIG.

[0016] Figure 7 for Figure 1 A top view of the equalizing frame in FIG.

[0017] Figure 8 for Figure 7 The cross-sectional view of the equalizing frame in FIG.

[0018] Fig. 9 for Figure 1 A front view of the positioning rod in FIG.

[0019] The accompanying drawings are marked as follows:

[0020] 1——cone 2——positioning rod 3——equal distribution frame

[0021] 4——Positioning sleeve 5——Stator 6——Rotor

[0022] 7——Lower cover 8——Motor shaft 9——Motor

[0023] 10——Flange 11——Threaded hole 12——Location pin

[0024] 13——Positioning hole 14——Bolt hole 15——Axis hole

[0025] 16——blade groove 17——elliptical inner cavity 18——intake groove

[0026] 19——Through hole. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0028] It should be noted in advance that, in the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, in the present invention, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them instead of being in direct contact. Moreover, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "above", "below", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention.

[0030] like Figures 1 to 9As shown, the preferred embodiment of the present invention is: a fixture for evenly dividing the gap between the stator and rotor of an electronic vacuum pump, the vacuum pump comprising a motor 9, a lower cover plate 7, a stator 5, and a rotor 6, the motor 9 is provided with a flange 10, the lower cover plate 7 is mounted on the flange 10, the stator 5 is mounted on the lower cover plate 7, the flange 10 is provided with a threaded hole 11, the lower cover plate 7 and the stator 5 are provided with a bolt through hole 14 corresponding to the position of the threaded hole 11 of the flange, the motor shaft 8 passes through the flange 10, the lower cover plate 7, the stator 5 and the shaft hole 15 of the rotor 6 in sequence; the flange is provided with a positioning pin 12, the lower cover plate is provided with a positioning hole 13, and the rotor 6 is provided with a blade groove 16, and the stator 5 is provided with an air intake groove 18 and an elliptical inner cavity 17 for accommodating the rotor 6; the clamp includes an equal distribution frame 3 and four positioning rods 2, the equal distribution frame 3 is a cross shape as a whole, a positioning sleeve 4 is provided in the middle, and four through holes 19 corresponding to the threaded holes 11 of the flange are provided on the outer circumference, and the through holes 19 are countersunk holes; the equal distribution frame 3 is fixed to the end of the motor shaft 8 through the positioning sleeve 4, and the four positioning rods 2 respectively pass through the through holes 19 of the equal distribution frame and the stator 5 and the bolt holes 14 on the lower cover plate 7 and are inserted into the threaded holes 11 of the flange; the neck of the positioning rod 2 is a cone 1.

[0031] The method of using this embodiment is as follows:

[0032] 1) Install the lower cover: After fixing the motor 9 with a fixture, install other auxiliary parts such as sealing rings, use the positioning pins 12 on the flange 10 to match the positioning holes 13 of the lower cover to position and install the lower cover 7;

[0033] 2) Rough installation of the stator: The four bolt holes 14 on the stator 5 are all provided with position accuracy, and the material of the stator 5 is powder metallurgy, which is a mold part, so the position accuracy is consistent with that of the mold (the equalizing frame is tailored accordingly), and the four bolt holes 14 of the stator 5 are aligned with the four bolt holes 14 of the lower cover plate 7 to roughly locate the position of the stator 5;

[0034] 3) Install the rotor: Install the rotor 6 on the motor shaft 8. Since the motor shaft 8 and the shaft hole 15 of the rotor 6 are matched with a small clearance, the rotor 6 can be precisely positioned at the overall longitudinal center axis position using the motor shaft 8;

[0035] 4) Evenly divide the stator and rotor gaps:

[0036] a. When designing, the distance between the two coaxial positioning rods 2 on the equalizing frame 3 is equal to the distance between the two bolt holes 14 on the stator 5. By using the motor shaft 8 being located at the center of the whole, the stator 5 is adjusted to a position with the motor shaft 8 as the geometric center, thereby achieving the purpose of evenly dividing the radial clearance between the stator 5 and the rotor 6;

[0037] b. The positioning sleeve 4 on the equalizing frame 3 can completely cover the motor shaft 8 and accurately position the motor shaft 8 at the center of the positioning sleeve;

[0038] c. The positioning rod 2 is accurately positioned through the countersunk through holes 19 on the four sides of the equalizing frame 3. The end of the positioning rod 2 passes through the lower cover plate 7 and is inserted into the threaded hole 11 of the flange, which plays a rough positioning role and can also be used for subsequent bolt installation positioning; the neck of the positioning rod 2 is a cone 1. When pressed hard on the equalizing frame 3, this cone 1 can fit tightly with the bolt through hole on the stator. Since the motor shaft 8 at the center position is always fixed, this will force the bolt through hole 14 on the stator 5 to slowly fine-tune to a position coaxial with the positioning rod 2. In this way, the stator 5 is accurately positioned at a position centered on the motor shaft 8, and finally the purpose of evenly dividing the stator-rotor gap is achieved.

[0039] In summary, this embodiment can accurately divide the stator-rotor gap, achieve quick and effective implementation, simple and convenient operation, and can be easily introduced into the production line for mass production, saving costs; however, this structure cannot measure the size of the stator-rotor gap, so before designing, it is necessary to confirm the size of the stator inner cavity and the size of the rotor outer diameter to know the size of the stator-rotor gap.

[0040] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

[0041] In order to make it easier for ordinary technicians in the field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. A fixture for equally dividing the gap between the stator and rotor of an electronic vacuum pump, characterized in that: The vacuum pump comprises a motor (9), a lower cover plate (7), a stator (5), and a rotor (6); the motor (9) is provided with a flange (10); the lower cover plate (7) is mounted on the flange (10); the stator (5) is mounted on the lower cover plate (7); the flange (10) is provided with a threaded hole (11); the lower cover plate (7) and the stator (5) are provided with bolt holes (14) corresponding to the positions of the threaded holes (11) of the flange; the motor shaft (8) passes through the shaft holes (15) of the flange (10), the lower cover plate (7), the stator (5), and the rotor (6) in sequence; the flange (10) is provided with a locating pin (12); the lower cover plate (7) is provided with a locating hole (13) ), the rotor (6) is provided with a blade slot (16); the stator (5) is provided with an air inlet slot (18) and an elliptical inner cavity (17) for accommodating the rotor (6); the fixture comprises an equal distribution frame (3) and four positioning rods (2); the equal distribution frame (3) is a cross-shaped frame as a whole, a positioning sleeve (4) is provided in the middle thereof, and four through holes (19) corresponding to the threaded holes (11) of the flange are provided on the outer circumference; the equal distribution frame (3) is fixed to the end of the motor shaft (8) through the positioning sleeve (4), and the four positioning rods (2) respectively pass through the through hole (19) of the equal distribution frame and the stator (5), and the bolt through holes (14) on the lower cover plate (7) and are inserted into the threaded holes (11) of the flange.

2. The fixture for equally dividing the gap between the stator and rotor of an electronic vacuum pump according to claim 1 is characterized in that: The neck of the positioning rod (2) is a cone (1).

3. The fixture for equally dividing the gap between the stator and rotor of an electronic vacuum pump according to claim 1 or 2, characterized in that: The through hole (19) on the equal distribution frame is a countersunk hole.

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