A motor for a diaphragm booster pump in a water purifier and its assembly and calibration method.

Abstract

This invention discloses a motor for a diaphragm booster pump in a water purifier and its assembly and calibration method. The motor includes a stator, a rotor, a rear end cover, and a front end cover. The rear end cover has a fixed bearing chamber for fixing a first bearing. The front end cover has a floating bearing chamber mechanism, which includes a floating bearing chamber for mounting a second bearing, at least three adjusting arms radially connected to the floating bearing chamber, and an adjusting drive component disposed on the front end cover and connected to the adjusting arms. By operating the adjusting drive component, the adjusting arms can be driven to move the floating bearing chamber relative to the front end cover in a radial plane, thereby calibrating the coaxiality of the second bearing and the first bearing. This invention also provides a corresponding assembly and calibration method. This solution can effectively compensate for accumulated assembly errors, ensure that the support axes at both ends of the rotor are highly coincident, and significantly improve the smoothness of motor operation, noise reduction, and bearing life.

Description

Technical Field

[0001] This invention relates to electric motors, and more particularly to an electric motor for a diaphragm booster pump in a water purifier and its assembly and calibration method. Background Technology

[0002] In the motor of a diaphragm booster pump for a water purifier, the rotor is typically supported by two bearings, one mounted on the rear end cover and the other on the front end cover. The rear end cover is rigidly fixed to one end of the stator by bolts, with the first bearing on it serving as the mounting reference. The front end cover is fixed to the other end of the stator in the same manner, and a second bearing is mounted thereon.

[0003] In theory, the first bearing of the rear end cover should be coaxial with the stator inner bore. However, machining tolerances, plastic shrinkage due to cooling, and assembly errors accumulate. Since the rear end cover and stator are a non-adjustable rigid connection, these accumulated errors cause a deviation between the actual axis of the first bearing and the ideal rotor axis. This deviation is transmitted to the front end cover via the rigid rotor shaft. If the second bearing of the front end cover is also rigidly fixed, the errors will further accumulate, and the final total coaxiality error may exceed the bearing's own clearance compensation capability.

[0004] This causes the rotor to operate with an angle between the rotation axes in the bearings at both ends, resulting in abnormal vibration and noise, and causing the bearings to bear uneven radial loads, accelerating wear, and seriously affecting the smoothness, quietness and service life of the motor. Summary of the Invention

[0005] This invention aims to overcome the shortcomings of existing technologies and provide a motor for a diaphragm booster pump in a water purifier and its assembly and calibration method. The motor incorporates an online calibrable floating bearing chamber mechanism in the front cover section, which can compensate for accumulated assembly errors and ensure high coaxiality of the bearings at both ends, thereby achieving smooth, quiet, and reliable operation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A motor for a diaphragm booster pump in a water purifier includes a stator, a rotor, a rear end cover, and a front end cover. The rear end cover includes a rear end cover fixedly installed at one end of the stator, and the rear end cover is provided with a fixed bearing chamber in which a first bearing is embedded.

[0008] The front end cover includes a front end cover that is fixedly installed at the other end of the stator portion, and a floating bearing chamber mechanism is provided on the front end cover;

[0009] The floating bearing chamber mechanism includes:

[0010] A floating bearing chamber, wherein a second bearing is embedded in the floating bearing chamber;

[0011] Adjusting arms, having at least three, and extending radially, are connected to the outer periphery of the floating bearing;

[0012] An adjustment drive is mounted on the front end cover and connected to the adjustment arm. Operating the adjustment drive drives the corresponding adjustment arm to move the floating bearing chamber relative to the front end cover in a radial plane, thereby calibrating the coaxiality of the second bearing and the first bearing.

[0013] In some embodiments, the adjustment drive includes a base rotatably mounted on the front end cover and a sleeve rotatably disposed on the base, the upper end of the sleeve being provided with an eccentric wheel; the adjustment arm is an adjustment plate, the outer end of the adjustment plate being provided with an adjustment hole; the rim of the eccentric wheel is tangentially contacted with the inner edge of the adjustment hole corresponding to the adjustment plate, and rotating the eccentric wheel drives the adjustment plate to move radially.

[0014] In some embodiments, a ratchet limiting structure is provided between the base and the sleeve to limit the reverse rotation of the sleeve relative to the base in the adjustment direction.

[0015] In some embodiments, the ratchet limiting structure includes a first fixed ratchet ring disposed on the base, and a first movable ratchet ring disposed at the lower end of the sleeve and meshing with the first fixed ratchet ring; the first fixed ratchet ring and the first movable ratchet ring cooperate to allow the sleeve to rotate unidirectionally relative to the base in a first direction.

[0016] In some embodiments, an elastic component is further provided between the sleeve and the base. The elastic component provides axial support force to the sleeve, so that while the first fixed ratchet ring and the first movable ratchet ring are engaged, the sleeve has axial lifting space.

[0017] In some embodiments, the front end cover has an annular groove, and the base is slidably disposed in the annular groove; a locking bolt is inserted axially into the sleeve, and the screw of the locking bolt passes through the base and can abut against the bottom of the annular groove; tightening the locking bolt can press and fix the base in the annular groove.

[0018] In some embodiments, the ratchet limiting structure further includes a second fixed ratchet ring disposed on the base, and a second movable ratchet ring disposed at the lower end of the sleeve and adapted to the second fixed ratchet ring; the anti-rotation direction of the second fixed ratchet ring and the second movable ratchet ring is opposite to the anti-rotation direction of the first fixed ratchet ring and the first movable ratchet ring; the second movable ratchet ring is separated under the support of the elastic component; and when the locking bolt is tightened to make the sleeve move down to the locking position against the supporting force of the elastic component, the second movable ratchet ring and the second fixed ratchet ring enter an engagement state.

[0019] In some embodiments, an annular constraint groove is formed on the rim of the eccentric wheel; a guide pin is fixedly provided on the adjusting plate, and the end of the guide pin is inserted into the constraint groove.

[0020] In some embodiments, the upper surface of the base located within the annular groove is a rough surface.

[0021] In addition, the present invention also provides an assembly and calibration method for a motor used in the above-mentioned diaphragm booster pump for a water purifier, comprising the following steps:

[0022] S100: Install one end of the rotor shaft into the first bearing;

[0023] S200: The floating bearing chamber mechanism is initially installed on the front end cover, and the other end of the rotating shaft is installed in the second bearing inside the floating bearing chamber;

[0024] S300: Using the first bearing as a reference, operate the adjustment drive to drive the adjustment arm to move radially, thereby adjusting the position of the central axis of the floating bearing chamber until the rotor rotates smoothly, thus achieving coaxiality calibration between the second bearing and the first bearing;

[0025] S400: After completing the coaxiality calibration, lock the floating bearing chamber mechanism onto the front cover.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The most significant contribution of this invention lies in the innovative introduction of a floating bearing chamber mechanism into the front cover section. This mechanism breaks away from the traditional rigid fixing of bearings at both ends, allowing the position of the second bearing to be dynamically adjusted based on the first bearing on the front cover. This, in principle, enables proactive compensation and correction of accumulated coaxiality errors throughout the entire machining and assembly process, reshaping the rotor's rotation axis from an error-constrained state to a theoretically ideal coincident straight line. This is the fundamental basis for all subsequent performance improvements, directly overcoming the root causes of vibration, noise, and wear.

[0028] 2. Building upon the "adjustable" capability, this invention further constructs a precise adjustment and locking mechanism through the coordinated design of the eccentric wheel-adjusting plate transmission pair and the one-way ratchet limiting structure. The eccentric wheel provides amplified and continuous radial displacement adjustment capability, making fine-tuning operations precise and intuitive; while the linked one-way ratchet (the mating mechanism of the first fixed ratchet ring and the first movable ratchet ring) ensures that each adjustment displacement is reliably maintained, effectively preventing accidental retraction due to external forces or vibrations during or after adjustment. This combination of "fine adjustment + instant locking" ensures that calibration accuracy can be stably and reliably achieved and maintained, providing operational assurance for the final high coaxiality state.

[0029] 3. In this invention, to further expand the error compensation range and cope with complex working conditions, an annular groove and a bidirectional ratchet ultimate locking mechanism are designed. The annular groove allows for fine-tuning of the entire adjustment drive component in the circumferential direction, further relaxing the initial machining accuracy requirements of the parts. More importantly, by pressing down the locking bolt, not only is the base firmly pressed into the annular groove, but the second set of ratchet teeth (the second fixed and movable ratchet rings) with opposite anti-rotation directions are also driven to engage. This ensures that after adjustment, the adjustment mechanism itself is completely locked in any rotational direction, forming an ultimate mechanical interlock to resist operational vibration and impact. This design transforms a temporary calibration state into a permanent and extremely robust mechanical structure, ensuring absolute reliability in long-term operation.

[0030] 4. Significantly improved overall performance: The combined effect of the above three-level linkage technology (error compensation foundation → precision anti-reverse adjustment → multi-dimensional enhanced locking) produces a synergistic multiplier effect:

[0031] a. Stability and quietness: The rotor rotates in truly coaxial bearings, with excellent dynamic balance, which fundamentally eliminates the periodic radial force fluctuations caused by shaft deviation, resulting in exceptionally smooth motor operation and significantly reduced noise.

[0032] b. Bearing and overall machine life: The bearings at both ends bear a uniform load, avoiding uneven wear and premature failure, and the bearing life is greatly extended, thereby improving the overall service life and reliability of the motor. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the present invention;

[0034] Figure 2 This is an exploded view of the present invention;

[0035] Figure 3 This is a longitudinal sectional view of the present invention;

[0036] Figure 4This is a sectional view of the front cover portion;

[0037] Figure 5 This is a schematic diagram of the floating bearing chamber mechanism;

[0038] Figure 6 This is a schematic diagram of the ratchet limiting structure;

[0039] Figure 7 for Figure 3 A magnified view of the area marked I.

[0040] Reference numerals: 100. Stator section, 200. Rotor section, 300. Rear end cover section, 310. Rear end cover, 311. Fixed bearing chamber, 312. First bearing, 400. Front end cover section, 410. Front end cover, 411. Annular groove, 500. Floating bearing chamber mechanism, 510. Floating bearing chamber, 511. Second bearing, 520. Adjusting arm, 521. Adjusting plate, 522. Adjusting hole, 523. Guide pin, 600. Adjusting drive component, 610. Base, 611. Rough surface, 620. Sleeve, 630. Eccentric wheel, 631. Constraint groove, 640. Ratchet limiting structure, 641. First fixed ratchet ring, 642. First movable ratchet ring, 643. Second fixed ratchet ring, 644. Second movable ratchet ring, 650. Elastic component, 660. Locking bolt Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] like Figures 1-7 As shown, an embodiment of the present invention provides a motor for a diaphragm booster pump for a water purifier, which mainly includes a stator part 100, a rotor part 200, a rear end cover part 300, and a front end cover part 400.

[0045] The rear end cover portion 300 includes a rear end cover 310 that is bolted to one end of the stator portion 100. A fixed bearing chamber 311 is machined on the inner side of the rear end cover 310, and a first bearing 312 is interference-fitted into the chamber. The first bearing 312 serves as a support reference for the rear end of the rotor shaft.

[0046] The front end cover portion 400 includes a front end cover 410 bolted to the other end of the stator portion 100. A floating bearing chamber mechanism 500 is provided in the central region of the front end cover 410. This floating bearing chamber mechanism 500 includes a floating bearing chamber 510, within which a second bearing 511 is interference-fitted to support the front end of the rotor shaft. On the outer cylindrical surface of the floating bearing chamber 510, at least three (three in this embodiment) radially outwardly extending adjusting arms 520 are evenly welded or integrally formed along the circumference. In this embodiment, the adjusting arms 520 are specifically adjusting plates 521, each adjusting plate 521 having a circular adjusting hole 522 at its end.

[0047] On the front cover 410, corresponding to the positions of each adjusting plate 521, an equal number of adjusting drive components 600 are installed. Each adjusting drive component 600 includes a base 610. An annular groove 411 is provided on the front cover 410. After being fixed together with the front cover 410 to the stator part 100, the coaxiality error between the axis of the annular groove 411 and the theoretical axis of the first bearing 312 on the rear cover 310 can be controlled within a certain range. Between them, compared to the requirements of traditional rigid assembly The requirements for machining precision have been greatly relaxed and reduced. The lower part of the base 610 is slidably fitted into the annular groove 411. The upper surface of the base 610 located in the annular groove 411 is sandblasted or knurled to form a rough surface 611 to enhance the friction during locking.

[0048] A through hole is provided axially at the center of the base 610. A sleeve 620 is rotatably fitted onto the upper part of the base 610 via a flange structure at its lower end. A compression spring 650 is provided between the sleeve 620 and the base 610 as an elastic component, so that the sleeve 620 is initially lifted upward. An eccentric wheel 630 is fixedly connected to the upper end of the sleeve 620.

[0049] On the upper end face of the base 610, two ratchet rings are coaxially engraved: a first fixed ratchet ring 641 located on the inner side and a second fixed ratchet ring 643 located on the outer side. Correspondingly, on the lower end face of the sleeve 620, two ratchet rings are also engraved: a first movable ratchet ring 642 that is always engaged with the first fixed ratchet ring 641, and a second movable ratchet ring 644 that is adapted to the second fixed ratchet ring 643 but is separated in the initial state due to the lifting of the compression spring.

[0050] The tooth profiles of the first fixed ratchet ring 641 and the first movable ratchet ring 642 are designed to allow the sleeve 620 (driving the eccentric wheel 630) to rotate unidirectionally in one direction (e.g., clockwise) relative to the base 610, thus preventing backlash during adjustment. The tooth profiles of the second fixed ratchet ring 643 and the second movable ratchet ring 644 have the opposite anti-rotation direction to the former.

[0051] A locking bolt 660 is inserted from the top of the sleeve 620, and its thread passes through the inner hole of the sleeve 620 and the threaded hole of the base 610 in sequence. Its threaded end can abut against the bottom of the annular groove 411 to lock the base 610.

[0052] An annular constraint groove 631 is machined on the rim of the eccentric wheel 630. Correspondingly, a guide pin 523 is fixedly installed on the adjusting plate 521, with its end slidably inserted into the constraint groove 631. This structure ensures a reliable connection between the eccentric wheel 630 and the adjusting plate 521, and prevents the sleeve 620 from disengaging from the adjusting arm 520 when the ratchet structure causes axial movement of the sleeve 620.

[0053] In addition, this invention also discloses an assembly and calibration method for a motor used in a diaphragm booster pump for a water purifier, the specific steps of which are as follows:

[0054] S100: Install one end of the rotor shaft of the rotor section 200 into the first bearing 312.

[0055] S200: The floating bearing chamber mechanism 500 (at this time, the second bearing 511 has been pressed into the floating bearing chamber 510) is initially installed on the front cover 410. Specifically, the three bases 610 are placed into the annular groove 411 but not locked, and then the other end of the rotor shaft is inserted into the second bearing 511. At this time, due to the accumulation of errors in various components, the rotor shaft may not rotate smoothly.

[0056] S300: Using the first bearing 312 as a reference, perform coaxiality calibration. Using a special tool (such as a screwdriver), sequentially rotate the eccentric wheels 630 of the three adjusting drive components 600 clockwise. Due to the unidirectional engagement of the first movable ratchet ring 642 and the first fixed ratchet ring 641, the eccentric wheels 630 can only rotate in one direction. When the eccentric wheels 630 rotate, their rims push the adjusting plate 521 radially through the adjusting hole 522, thereby causing the entire floating bearing chamber 510 to move in the radial plane. By sensing the rotational resistance of the rotor shaft or using measuring instruments, finely adjust the three eccentric wheels 630 until the rotor shaft rotates extremely smoothly, indicating that the axis of the second bearing 511 has achieved a high degree of coaxiality with the axis of the first bearing 312.

[0057] During this process, if it is necessary to fine-tune the circumferential position of the floating bearing chamber 510, the base 610 can be gently moved to make it slide within the annular groove 411.

[0058] S400: After completing the coaxiality calibration, perform the final locking. Use an Allen wrench to tighten the three locking bolts 660 in sequence. As the locking bolts 660 are screwed downwards, their ends first press against the bottom of the annular groove 411. Continuing to screw them in pushes the base 610 upwards, causing its rough surface 611 to press tightly against the upper wall of the annular groove 411, achieving friction locking. Simultaneously, the head of the locking bolts 660 pulls the sleeve 620 downwards, compressing the elastic component 650 and causing the sleeve 620 to move downwards. This downward movement has two key effects: first, it allows the first movable ratchet ring 642 to engage more deeply with the first fixed ratchet ring 641, resulting in a more secure one-way lock; second, it allows the previously separated second movable ratchet ring 644 to engage with the second fixed ratchet ring 643. Since the two pairs of ratchet rings have opposite anti-rotation directions, when they mesh simultaneously, the rotation of the sleeve 620 relative to the base 610 in any direction is completely locked, the position of the eccentric wheel 630 is ultimately fixed, and the entire floating bearing chamber mechanism 500 is firmly locked onto the front cover 410.

[0059] The motor assembly is now complete. With the rotor supported by bearings at both ends that are highly coaxial, it can achieve smooth, quiet, and long-lasting operation.

[0060] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the protection scope of the present invention.

[0061] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A motor for a diaphragm booster pump in a water purifier, comprising a stator portion (100), a rotor portion (200), a rear end cover portion (300), and a front end cover portion (400); the rear end cover portion (300) includes a rear end cover (310) fixedly installed at one end of the stator portion (100), the rear end cover (310) having a fixed bearing chamber (311) therein, wherein a first bearing (312) is embedded, characterized in that: The front cover portion (400) includes a front cover (410) fixedly installed at the other end of the stator portion (100), and a floating bearing chamber mechanism (500) is provided on the front cover (410); The floating bearing chamber mechanism (500) includes A floating bearing housing (510), in which a second bearing (511) is embedded. Adjusting arms (520), having at least three, are radially extended and connected to the outer periphery of the floating bearing chamber (510); An adjustment drive (600) is disposed on the front end cover (410) and connected to the adjustment arm (520). The adjustment drive (600) is operated to drive the corresponding adjustment arm (520) to move the floating bearing chamber (510) relative to the front end cover (410) in the radial plane. The adjustment drive component (600) includes a base (610) rotatably mounted on the front end cover (410) and a sleeve (620) rotatably disposed on the base (610). An eccentric wheel (630) is provided at the upper end of the sleeve (620). The adjustment arm (520) is an adjustment plate (521). An adjustment hole (522) is provided at the outer end of the adjustment plate (521). The rim of the eccentric wheel (630) is in tangential contact with the inner edge of the adjustment hole (522) of the corresponding adjustment plate (521). Rotating the eccentric wheel (630) drives the adjustment plate (521) to move radially. A ratchet limiting structure (640) is provided between the base (610) and the sleeve (620) to limit the reverse rotation of the sleeve (620) relative to the base (610) in the adjustment direction; The ratchet limiting structure (640) includes a first fixed ratchet ring (641) disposed on the base (610) and a first movable ratchet ring (642) disposed at the lower end of the sleeve (620) and meshing with the first fixed ratchet ring (641); the first fixed ratchet ring (641) and the first movable ratchet ring (642) cooperate to make the sleeve (620) rotate unidirectionally relative to the base (610) in a first direction.

2. The motor for the diaphragm booster pump of a water purifier according to claim 1, characterized in that: An elastic component (650) is also provided between the sleeve (620) and the base (610). The elastic component (650) provides axial support force to the sleeve (620), so that the first fixed ratchet ring (641) and the first movable ratchet ring (642) are engaged, while the sleeve (620) has space for axial lifting and lowering.

3. The motor for the diaphragm booster pump of a water purifier according to claim 2, characterized in that: The front end cover (410) is provided with an annular groove (411), and the base (610) is slidably disposed in the annular groove (411); a locking bolt (660) is inserted axially into the sleeve (620), and the screw of the locking bolt (660) passes through the base (610) and can abut against the bottom of the annular groove (411); tightening the locking bolt (660) can press and fix the base (610) in the annular groove (411).

4. The motor for the diaphragm booster pump of a water purifier according to claim 3, characterized in that: The ratchet limiting structure (640) further includes a second ratchet assembly; the second ratchet assembly includes a second fixed ratchet ring (643) disposed on the base (610), and a second movable ratchet ring (644) disposed at the lower end of the sleeve (620) and adapted to the second fixed ratchet ring (643); the anti-rotation direction of the second fixed ratchet ring (643) and the second movable ratchet ring (644) is opposite to the anti-rotation direction of the first fixed ratchet ring (641) and the first movable ratchet ring (642); The second movable ratchet ring (644) is separated under the support of the elastic component (650); and when the locking bolt (660) is tightened to move the sleeve (620) down to the locking position against the supporting force of the elastic component (650), the second movable ratchet ring (644) and the second fixed ratchet ring (643) enter the engagement state.

5. The motor for a diaphragm booster pump in a water purifier according to any one of claims 2 to 4, characterized in that: The eccentric wheel (630) has an annular constraint groove (631) on its rim; the adjusting plate (521) is fixedly provided with a guide pin (523), the end of which is inserted into the constraint groove (631).

6. The motor for a diaphragm booster pump in a water purifier according to claim 3 or 4, characterized in that: The upper surface of the base (610) located within the annular groove (411) is a rough surface (611).

7. A method for assembling and calibrating a motor for a diaphragm booster pump in a water purifier according to any one of claims 1-6, characterized in that, Includes the following steps: S100: Install one end of the rotor shaft of the rotor part (200) into the first bearing (312); S200: The floating bearing chamber mechanism (500) is initially installed on the front end cover (410), and the other end of the rotating shaft is installed in the second bearing (511) inside the floating bearing chamber (510); S300: Using the first bearing (312) as a reference, operate the adjustment drive (600) to drive the adjustment arm (520) to move radially, thereby adjusting the position of the central axis of the floating bearing chamber (510) until the rotor part (200) rotates smoothly, and realize the coaxiality calibration of the second bearing (511) and the first bearing (312); S400: After completing the coaxiality calibration, lock the floating bearing chamber mechanism (500) on the front end cover (410).

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