CN212215165U - Dispersing machine - Google Patents

Abstract

The utility model belongs to the technical field of stirring machinery, in particular to a dispersion machine, which comprises a transverse pump body and a driving shaft, wherein one end of the driving shaft is used for driving a dispersion machine rotor in the pump body, and the other end extends out of the pump body to be connected with a power source; the dispersion machine also comprises a stator fixedly connected with the pump body, and the stator is inserted into a gap between the first rotor and the second rotor; gaps formed between the inner peripheral surface and the outer peripheral surface of the stator and between the outer peripheral surface of the first rotor and the inner peripheral surface of the second rotor are used for processing materials; be equipped with feed inlet and discharge gate on the pump body, dispenser rotor and stator are arranged in the cavity between feed inlet and the discharge gate, carry out twice dispersion grinding to the material, make the material obtain abundant processing, and dispersion effect is good, and production efficiency is high.

Description

Dispersing machine

Technical Field

The utility model belongs to the technical field of the stirring machine, concretely relates to dispersion machine.

Background

The disperser is one of the mixers in broad sense, and can form strong stirring flocculation flow under the strong action force of a stator and a rotor of the disperser due to the adoption of the high-speed stirrer, and generally has strong dispersing and emulsifying effects on materials, so the disperser is also called as the disperser and is suitable for emulsifying, mixing and dispersing the materials in the chemical industries such as coatings, printing ink, paints, food, cosmetics, medicines, pesticides, petroleum and the like.

In above-mentioned trade, the material generally needs abundant stirring and refines to guarantee the quality of product, but current dispenser only carries out once dispersion grinding to the material, is difficult to guarantee the degree of consistency of material and the refinement nature of material, and production efficiency is low, so still need establish a process in addition and stir and grind the material, increased manufacturing cost simultaneously.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dispersion machine carries out twice dispersion to the material and grinds, makes the material obtain abundant processing, and dispersion effect is good, and production efficiency is high.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a disperser comprises a transverse pump body and a driving shaft, wherein one end of the driving shaft is used for driving a disperser rotor in the pump body, and the other end of the driving shaft extends out of the pump body and is connected with a power source; the dispersion machine also comprises a stator fixedly connected with the pump body, and the stator is inserted into a gap between the first rotor and the second rotor; gaps formed between the inner peripheral surface and the outer peripheral surface of the stator and between the outer peripheral surface of the first rotor and the inner peripheral surface of the second rotor are used for processing materials; the pump body is provided with a feed inlet and a discharge outlet, and the rotor and the stator of the dispersion machine are positioned in a cavity between the feed inlet and the discharge outlet.

Preferably, the feed inlets comprise a first feed inlet and a second feed inlet, the two feed inlets are dispersed at two ends of the material processing area, and the first feed inlet is positioned on the pump body of the cylindrical pump body and at the lower part of the pump body; the second feed inlet is positioned on the end cover of the pump body and is obliquely arranged with an inlet at the upper part and an outlet at the lower part, and the outlet of the second feed inlet in the pump body is positioned in the middle of the end cover.

Preferably, a circular ring-shaped discharge hole ring sleeve with the inner diameter larger than that of the pump body is arranged between the pump body and the end cover, the discharge hole is arranged on the discharge hole ring sleeve, the outlet of the discharge hole is upward, and a material processing chamber is formed among the discharge hole ring sleeve, the pump body and the end cover; the rotor and the stator of the dispersion machine are both positioned in the material processing chamber, wherein the outer ring surface of the second rotor is attached to the inner wall of the discharge hole ring sleeve.

Preferably, the first rotor is sleeved on the driving shaft through a shaft sleeve extending from the middle part of the first rotor to one side, and a fastening nut at the end part of the driving shaft locks the first rotor and the driving shaft; the annular second rotor is fixed on the first rotor through the side plate and can synchronously rotate along with the first rotor.

Preferably, the first rotor comprises a disc-shaped turntable, a plurality of first rotor blades protruding towards one side are arranged on the outer periphery of the turntable, and the plurality of first rotor blades are uniformly distributed along the outer periphery of the turntable; the outer side surface of the first rotor blade is arc-shaped and consistent with the radian of the inner circumferential surface of the stator.

Preferably, the first rotor blade is provided with a threaded hole, the side plate of the second rotor is provided with a through hole which penetrates through the plate surface and is matched with the threaded hole, a screw penetrates through the through hole to enable the side plate of the second rotor to be attached and fixed to the first rotor blade, the second rotor is provided with a second rotor blade opposite to the first rotor blade in direction, and a gap for inserting a stator is formed in the radial direction between the second rotor blade and the first rotor blade.

Preferably, the annular stator is provided with a plurality of dispersion holes which are uniformly distributed along the circumferential direction of the annular plate surface and penetrate through the plate surface; the dispersing holes comprise a first dispersing hole and a second dispersing hole which are arranged along the plate width direction of the dispersing holes, the stator is matched with the first rotor blade at the position of the first dispersing hole, and the first dispersing hole is a material discharge channel formed by the stator and the first rotor after primary dispersing and grinding; the stator is matched with the second rotor blade at the position of the second dispersion hole, and the second dispersion hole is a material discharge channel formed by secondarily dispersing and grinding the stator and the second rotor.

Preferably, the second rotor blades are distributed along the outer periphery of the annular side plate equally, and the inner side surfaces of the second rotor blades are arc-shaped and consistent with the radian of the outer peripheral surface of the stator; the number of the second rotor blades is the same as that of the first rotor blades, and the positions of the second rotor blades and the first rotor blades correspond in sequence.

Preferably, the first dispersion holes and the second dispersion holes are strip-shaped holes, and the hole lengths of the two holes form an included angle; the width of the second dispersion holes is larger than that of the first dispersion holes, and the number of the first dispersion holes arranged in the circumferential direction of the stator is larger than that of the second dispersion holes.

Preferably, one end of the stator is provided with a stator base, and the stator is arranged in a counter bore of the end cover through the stator base; the orifice of the counter bore is in an inward shrinkage shape, the inner end face of the stator base is provided with a convex edge matched with the inward shrinkage counter bore, and the stator base is in snap fit with the counter bore.

The beneficial effects of the utility model reside in that:

1) the incoming material at the feed inlet is guided to a gap between the first rotor and the stator through the pump cavity to be subjected to primary dispersion grinding, when the primary dispersion grinding is carried out, the material is simultaneously subjected to a series of comprehensive force effects such as centrifugal extrusion, liquid layer friction, liquid layer impact and the like, the material is primarily dispersed and mixed, the material subjected to the primary dispersion grinding is thrown out of a primary dispersion grinding area between the first rotor and the stator by the first rotor rotating at a high speed under the action of the centrifugal force and enters a secondary dispersion grinding area between the second rotor and the stator to be subjected to secondary dispersion grinding, the material is subjected to a series of comprehensive force effects such as centrifugal extrusion, liquid layer friction, liquid layer impact and the like, then the material generates extremely large centrifugal force under the action of the second rotor rotating at a high speed, is ejected out of the secondary dispersion grinding area and enters the discharge outlet to complete dispersion mixing treatment of the material, and the dispersion, the material is fully treated, the dispersing effect is good, and the production efficiency is high.

2) Rationally arrange two feed inlets, can obtain abundant dispersion mixing after making the material enter into the pump body, can put into the material that does not use in first feed inlet and the second feed inlet, the material that gets into in the pump body arrives the material processing region at dispenser rotor and stator place respectively, under the powerful centrifugal force effect of first rotor and second rotor, the material is all thrown into in the clearance between first rotor and the stator, disperses the mixing process.

3) The utility model discloses a pump, including first rotor blade, curb plate and second rotor blade, the opening region is formed between curb plate and the second rotor blade, the one end of stator is inserted and is arranged in this opening region, respectively with first rotor blade, form primary dispersion grinding region and secondary dispersion grinding region between the second rotor blade, the other end of stator and the end cover fixed connection of pump body tip, this dispersion machine is when the maintenance, only need pull down the end cover, can take the stator out from the pump body, pull down holding nut, can take first rotor and second rotor out from the pump chamber of the pump body simultaneously, all the other parts can be dismantled in proper order, easy maintenance, user's of being convenient for use.

4) After the materials enter the material processing chamber from the first feed inlet and the second feed inlet, the first rotor blade and the second rotor blade generate strong centrifugal force to throw the materials into a gap between the first rotor and the stator, the materials are ejected out at a high speed through the first dispersion holes after being subjected to primary dispersion grinding, the materials enter the gap between the second rotor and the stator, the materials are subjected to secondary dispersion grinding, and finally are thrown into the discharge port under the action of the centrifugal force of the second rotor rotating at a high speed, and the pump body is removed.

5) The sizes of the first dispersing holes and the second dispersing holes are directly related to the size of the material after dispersing and grinding, a user determines according to practical application, and the width of the second dispersing holes is larger than that of the first dispersing holes so as to enable the second rotor to throw the material out of the material processing chamber conveniently.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of a stator and rotor portion of the present invention;

FIG. 3 is a schematic view of a first rotor structure;

FIG. 4 is a schematic cross-sectional view of a first rotor;

FIG. 5 is a schematic view of a second rotor configuration;

FIG. 6 is a schematic cross-sectional view of a second rotor;

FIG. 7 is a schematic view of the first rotor assembled with the second rotor;

fig. 8 is a schematic structural view of a stator.

Detailed Description

For the purpose of facilitating understanding, the present invention will be described in detail below with reference to the accompanying drawings.

A disperser comprises a transverse pump body 10 and a driving shaft 20, wherein one end of the driving shaft 20 is used for driving a disperser rotor in the pump body 10, and the other end of the driving shaft extends out of the pump body 10 and is connected with a power source; the dispersion machine further comprises a stator 40 fixedly connected with the pump body 10, wherein the stator 40 is inserted into a gap between the first rotor 31 and the second rotor 32; gaps formed between the inner circumferential surface and the outer circumferential surface of the stator 40 and the outer circumferential surface of the first rotor 31 and the inner circumferential surface of the second rotor 32 are used for processing materials; the pump body 10 is provided with a feed inlet and a discharge outlet 11, and the rotor and the stator 40 of the dispersion machine are positioned in a cavity between the feed inlet and the discharge outlet 11. The material enters the pump body 10 from the feed inlet, the drive shaft 20 at this time drives the first rotor 31 to rotate at a high speed, the incoming material at the feed inlet is guided to a gap between the first rotor 31 and the stator 40 through the pump cavity to perform primary dispersion grinding, the material is simultaneously subjected to a series of comprehensive forces of centrifugal extrusion, liquid layer friction, liquid layer impact and the like during primary dispersion grinding, the material is primarily dispersed and mixed, the material subjected to primary dispersion grinding is thrown out of a primary dispersion grinding area between the first rotor 31 and the stator 40 by the first rotor 31 rotating at a high speed under the action of centrifugal force and enters a secondary dispersion grinding area between the second rotor 32 and the stator 40, the material is subjected to a series of comprehensive forces of centrifugal extrusion, liquid layer friction, liquid layer impact and the like, then the material generates a great centrifugal force under the action of the second rotor 32 rotating at a high speed and is ejected from the secondary dispersion grinding area, the material is dispersed and mixed in the discharge port 11, and the material is dispersed and ground twice by the dispersing machine, so that the material is fully treated, the dispersing effect is good, and the production efficiency is high.

In order to mix various materials, the feeding holes comprise a first feeding hole 121 and a second feeding hole 122 which are dispersed at two ends of the material processing area, the first feeding hole 121 is positioned on the pump body of the cylindrical pump body 10 and at the lower part of the pump body 10, and the materials are pumped from the lower part of the pump body 10 into the pump body 10; the second feed inlet 122 is located on the end cover 13 of the pump body 10, and is obliquely arranged with an inlet at the upper part and an outlet at the lower part, and the outlet of the second feed inlet 122 in the pump body 10 is located in the middle of the end cover 13, so that the two feed inlets are reasonably arranged, and materials can be fully dispersed and mixed after entering the pump body 10. Unused materials can be placed in the first feed inlet 121 and the second feed inlet 122, the materials entering the pump body 10 respectively reach material processing areas where the rotor and the stator 40 of the dispersion machine are located, and under the action of strong centrifugal force of the first rotor 31 and the second rotor 32, the materials are thrown into a gap between the first rotor 31 and the stator 40, so that the materials are subjected to dispersion and mixing processing.

A circular discharge hole ring sleeve 111 with the inner diameter larger than that of the pump body 10 is arranged between the pump body 10 and the end cover 13, the discharge hole 11 is arranged on the discharge hole ring sleeve 111, the outlet of the discharge hole is upward, and a material processing chamber is formed between the discharge hole ring sleeve 111 and the pump body 10 and the end cover 13; the disperser rotor and stator 40 are both located in the material processing chamber, wherein the outer annular surface of the second rotor 32 abuts against the inner wall of the discharge hole ring sleeve 111. When the material entered from first feed inlet 121, in the material processing chamber was reachd to the pump chamber along pump body 10, and the material directly entered into the material processing chamber when entering from second feed inlet 122, set up the ring form discharge gate ring cover 111 that the internal diameter is greater than the internal diameter of pump body 10 between pump body 10 and the end cover 13, the discharge gate ring cover 111 of major diameter, be convenient for the installation of dispenser rotor and stator 40 in pump body 10 more, there is sufficient installation space, also be simultaneously for the material after the dispersion mixing processing is thrown away at the material processing chamber, be convenient for discharge material.

The first rotor 31 is sleeved on the driving shaft 20 through a shaft sleeve 311 extending from the middle part of the first rotor to one side, and the fastening nut 21 at the end part of the driving shaft 20 locks the first rotor 31 and the driving shaft 20; the annular second rotor 32 is fixed on the first rotor 31 through a side plate 321 and can rotate synchronously with the first rotor 31. Carry out fixed connection between second rotor 32 and the first rotor 31, on the one hand for both possess synchronous slew velocity, on the other hand, when the material entered from first feed inlet 121, if second rotor 32 also with the same structural connection of first rotor 31 on drive shaft 20, then connection structure can interfere the material and get into material processing chamber, influences the normal use of dispenser, so the utility model discloses in adopt to fix second rotor 32 on first rotor 31 and realize synchronous rotation along with first rotor 31 through curb plate 321.

More specifically, the first rotor 31 includes a disk-shaped turntable 312, a plurality of first rotor blades 313 protruding to one side are disposed on the outer periphery of the turntable 312, and the plurality of first rotor blades 313 are equally distributed along the outer periphery of the turntable 312; the outer side surface of the first rotor blade 313 is formed in an arc shape corresponding to the arc shape of the inner circumferential surface of the stator 40. The material is processed by utilizing the effects of centrifugal extrusion, liquid layer friction, liquid layer impact and the like formed between the first rotor blade 313 rotating at a high speed and the stator 40, so that the material is fully dispersed and mixed, meanwhile, the outer side surface of the first rotor blade 313 is in an arc shape consistent with the radian of the inner peripheral surface of the stator 40, the consistency of the acting force generated between each part of the first rotor blade 313 and the stator 40 during rotation is ensured, and the processing is more uniform.

More specifically, in the structure between the first rotor 31 and the second rotor 32, the first rotor blade 313 is provided with a threaded hole 314, the side plate 321 of the second rotor 32 is provided with a through hole 322 which passes through the plate surface and is matched with the threaded hole 314, a screw 323 passes through the through hole 322 to attach the side plate 321 of the second rotor 32 to the first rotor blade 313, the second rotor blade 32 is provided with a second rotor blade 324 which is opposite to the first rotor blade 313 in direction, the radial direction between the second rotor blade 324 and the first rotor blade 313 forms a gap for inserting the stator 40, that is, an opening region is formed between the first rotor blade 313, the side plate 321, and the second rotor blade 324, one end of the stator 40 is inserted into the opening region, a primary dispersion grinding area and a secondary dispersion grinding area are respectively formed between the first rotor blade 313 and the second rotor blade 324, and the other end of the stator 40 is fixedly connected with the end cover 13 at the end part of the pump body 10. When the dispersing machine is maintained, the stator 40 can be drawn out from the pump body 10 only by detaching the end cover 13, the fastening nut 21 is detached, the first rotor 31 and the second rotor 32 can be simultaneously drawn out from the pump cavity of the pump body 10, and other parts can be sequentially detached, so that the dispersing machine is convenient to maintain and use by a user.

The annular stator 40 is provided with a plurality of dispersion holes which are evenly distributed along the circumferential direction of the annular plate surface and penetrate through the plate surface; the dispersion holes comprise a first dispersion hole 41 and a second dispersion hole 42 which are arranged along the width direction of the dispersion hole, the stator 40 is matched with the first rotor blade 313 at the position of the first dispersion hole 41, and the first dispersion hole 41 is a material discharge channel after the stator 40 and the first rotor 31 are subjected to primary dispersion grinding; the stator 40 is matched with the second rotor blade 324 at the position of the second dispersion hole 42, and the second dispersion hole 42 is a material discharge passage after the stator 40 and the second rotor 32 are subjected to secondary dispersion grinding. The specific working process is as follows: after the material enters the material processing chamber from the first feed port 121 and the second feed port 122, because a certain angle α exists between the side edge of the first rotor blade 313 and the plane where the axis is located, the angle α is generally 5 ° < α < 15 ° in the actual production process, similarly, a certain angle β exists between the side edge of the second rotor blade 324 and the plane where the axis is located, and the angle β is equal to the angle α, as shown in fig. 7, in this embodiment, the angle β and the angle α are both 10 °, the angle is set so that the first rotor blade 313 and the second rotor blade 324 generate stronger centrifugal force to throw the material into the gap between the first rotor 31 and the stator 40, after the material is primarily dispersed and ground, the material is ejected at high speed through the first dispersion hole 41 to enter the gap between the second rotor 32 and the stator 40, the material is secondarily dispersed and ground, and finally under the centrifugal force of the second rotor 32 rotating at high speed, is thrown into the discharge port 11 and is discharged out of the pump body 10, the materials continuously enter from the first feed port 121 and the second feed port 122, and strong turning floc flow is formed under the strong acting force of the stator and the rotor of the dispersion machine to be fully dispersed and mixed, so that the effect of the dispersion machine is realized.

The second rotor blades 324 are equally distributed along the outer periphery of the annular side plate 321, and the inner side surfaces of the second rotor blades 324 are arc-shaped and consistent with the radian of the outer peripheral surface of the stator 40; the number of the second rotor blades 324 corresponds to the number of the first rotor blades 313, and the positions of the second rotor blades 324 and the first rotor blades 313 correspond in turn.

The first dispersion holes 41 and the second dispersion holes 42 are strip-shaped holes, and the lengths of the two holes form an included angle; the second dispersion holes 42 have a width greater than that of the first dispersion holes 41, and the number of the first dispersion holes 41 disposed in the circumferential direction of the stator 40 is greater than that of the second dispersion holes 42. The sizes of the first dispersion holes 41 and the second dispersion holes 42 are directly related to the size of the material after dispersion grinding, and the user determines according to practical application that the width of the second dispersion holes 42 is larger than that of the first dispersion holes 41 so as to facilitate the second rotor 32 to throw the material out of the material processing chamber.

One end of the stator 40 is provided with a stator base 43, and the stator 40 is installed in a counterbore 131 of the end cover 13 through the stator base 43; the orifice of the counterbore 131 is in an inward shrinkage shape, the inner end face of the stator base 43 is provided with a convex rib matched with the inward shrinkage counterbore 131, and the stator base 43 is in snap fit with the counterbore 131.

Claims (10)

1. The utility model provides a dispenser, includes horizontal pump body (10) and drive shaft (20), the one end of drive shaft (20) is used for driving the dispenser rotor in pump body (10), and the other end extends to pump body (10) and is connected with the power supply outward, its characterized in that: the rotor of the dispersion machine comprises a first rotor (31) and a second rotor (32), the second rotor (32) is sleeved outside the first rotor (31) in a radial interval mode, and the two rotors are coaxially arranged; the dispersion machine further comprises a stator (40) fixedly connected with the pump body (10), wherein the stator (40) is inserted into a gap between the first rotor (31) and the second rotor (32); gaps formed between the inner circumferential surface and the outer circumferential surface of the stator (40) and between the outer circumferential surface of the first rotor (31) and the inner circumferential surface of the second rotor (32) are used for processing materials; the pump body (10) is provided with a feeding hole and a discharging hole (11), and the rotor and the stator (40) of the dispersion machine are positioned in a cavity between the feeding hole and the discharging hole (11).

2. A dispenser according to claim 1, wherein: the feeding holes comprise a first feeding hole (121) and a second feeding hole (122), the two feeding holes are dispersed at two ends of the material processing area, and the first feeding hole (121) is positioned on the pump body of the cylindrical pump body (10) and positioned at the lower part of the pump body (10); the second feed port (122) is positioned on the end cover (13) of the pump body (10) and is obliquely arranged with an inlet at the upper part and an outlet at the lower part, and the outlet of the second feed port (122) in the pump body (10) is positioned in the middle of the end cover (13).

3. A dispenser according to claim 2, wherein: an annular discharge hole ring sleeve (111) with the inner diameter larger than that of the pump body (10) is arranged between the pump body (10) and the end cover (13), the discharge hole (11) is arranged on the discharge hole ring sleeve (111) and has an upward outlet, and a material processing chamber is formed between the discharge hole ring sleeve (111) and the pump body (10) and the end cover (13); the rotor and the stator (40) of the dispersion machine are both positioned in the material processing chamber, wherein the outer ring surface of the second rotor (32) is attached to the inner wall of the discharge hole ring sleeve (111).

4. A dispenser according to claim 1, wherein: the first rotor (31) is sleeved on the driving shaft (20) through a shaft sleeve (311) extending from the middle part of the first rotor to one side, and the first rotor (31) is locked with the driving shaft (20) through a fastening nut (21) at the end part of the driving shaft (20); the annular second rotor (32) is fixed on the first rotor (31) through a side plate (321) and can synchronously rotate along with the first rotor (31).

5. A dispenser according to claim 4, wherein: the first rotor (31) comprises a disc-shaped rotating disc (312), a plurality of first rotor blades (313) protruding towards one side are arranged on the outer periphery of the rotating disc (312), and the first rotor blades (313) are evenly distributed along the outer periphery of the rotating disc (312); the outer side surface of the first rotor blade (313) is in an arc shape consistent with the radian of the inner circumferential surface of the stator (40).

6. A dispenser according to claim 5, wherein: the rotor structure is characterized in that a threaded hole (314) is formed in the first rotor blade (313), a through hole (322) which penetrates through the plate surface and is matched with the threaded hole (314) is formed in a side plate (321) of the second rotor (32), a screw (323) penetrates through the through hole (322) to enable the side plate (321) of the second rotor (32) to be attached and fixed to the first rotor blade (313), a second rotor blade (324) which is opposite to the first rotor blade (313) in pointing direction is arranged on the second rotor (32), and a gap for inserting the stator (40) is formed in the radial direction between the second rotor blade (324) and the first rotor blade (313).

7. A dispenser according to claim 6, wherein: the annular stator (40) is provided with a plurality of dispersion holes which are evenly distributed along the circumferential direction of the annular plate surface and penetrate through the plate surface; the dispersing holes comprise a first dispersing hole (41) and a second dispersing hole (42) which are arranged along the plate width direction of the dispersing holes, the stator (40) is matched with the first rotor blade (313) at the position of the first dispersing hole (41), and the first dispersing hole (41) is a material discharge channel formed by the stator (40) and the first rotor (31) after primary dispersing and grinding; the stator (40) is matched with the second rotor blade (324) at the position of the second dispersion hole (42), and the second dispersion hole (42) is a material discharge channel after the stator (40) and the second rotor (32) are subjected to secondary dispersion grinding.

8. A dispenser according to claim 7, wherein: the second rotor blades (324) are uniformly distributed along the outer periphery of the annular side plate (321), and the inner side surfaces of the second rotor blades (324) are arc-shaped, and the radian of the inner side surfaces of the second rotor blades is consistent with that of the outer peripheral surface of the stator (40); the number of the second rotor blades (324) is the same as the number of the first rotor blades (313), and the positions of the second rotor blades (324) and the first rotor blades (313) correspond in sequence.

9. A dispenser according to claim 8, wherein: the first dispersion holes (41) and the second dispersion holes (42) are strip-shaped holes, and the lengths of the two holes form an included angle; the width of the second dispersion holes (42) is larger than that of the first dispersion holes (41), and the number of the first dispersion holes (41) arranged in the circumferential direction of the stator (40) is larger than that of the second dispersion holes (42).

10. A dispenser according to claim 3, wherein: one end of the stator (40) is provided with a stator base (43), and the stator (40) is arranged in a counter bore (131) of the end cover (13) through the stator base (43); the hole opening of the counter bore (131) is in an inward shrinkage shape, the inner end face of the stator base (43) is provided with a convex edge matched with the inward shrinkage counter bore (131), and the stator base (43) is in snap fit with the counter bore (131).

Images