Wet-type linear stepping motor

Abstract

The invention relates to the technical field of motors, in particular to a wet-type linear stepping motor which comprises a machine shell, an armature, a motor rotor, an electric connector and a wire, and the armature, the motor rotor, the electric connector and the wire are arranged in the machine shell. A first medium-resistant insulating sleeve is sleeved at the connecting part of the wiring end of the enameled wire and the lead, and the first medium-resistant insulating sleeve is filled with first insulating impregnating resin; an electric connector mounting seat is integrally formed on the casing, and the electric connector is welded at an opening part of the electric connector mounting seat; an electric connector welding cup is arranged at the tail end of the electric connector, and a wire core at the second end of the wire is inserted into a blind hole of the electric connector welding cup and is welded; a second medium-resistant insulating sleeve is sleeved at the connecting part of the second end of the lead and the electric connector welding cup; and second insulating impregnating resin is filled in the second medium-resistant insulating sleeve. According to the invention, the corrosion resistance of the wet-type linear stepping motor can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a wet linear stepping motor. Background Art

[0002] As a linear direct-drive device, the linear stepper motor is different from the circular stepping of conventional stepper motors or the use of a worm gear conversion mechanism to convert rotary motion into linear motion. The linear stepper motor does not have the problems of large position feedback volume and poor low-speed stability of other types of motors. It also does not have the two-body structure of the ball screw shaft and the stepper motor shaft in the conventional structure. It is connected to the stepper motor shaft by mechanical fastening to achieve miniaturization. At the same time, due to the characteristics of the self-positioning torque of the stepper motor, the linear stepper motor has a self-locking function.

[0003] In the existing linear stepper motor, the enameled wire of the armature is connected to the electrical connector through a wire. In the traditional connection method, the enameled wire is welded to the wire, and the wire is welded to the welding cup of the electrical connector, which has problems of being unable to resist corrosive media and insulation.

[0004] When the linear stepper motor is a wet stepper motor assembly and the internal components of the motor are completely immersed in high-voltage, corrosive media for a long time, the welding parts between the enameled wire and the conductor are easily corroded, and the welding parts between the conductor and the welding cup of the electrical connector are also easily corroded. Therefore, it is necessary to provide a wet linear stepper motor to solve the problem that the welding parts between the enameled wire and the conductor, and the welding parts between the conductor and the welding cup of the electrical connector are easily corroded, so as to solve the problems of easy corrosion, high voltage resistance and insulation of the internal components of the small air gap stepper motor that are completely immersed in high-voltage, corrosive media. Summary of the invention

[0005] The main purpose of the present invention is to provide a wet linear stepper motor, aiming to solve the problem that the parts where the enameled wire is welded to the conductor and the parts where the conductor is welded to the welding cup of the electrical connector are easily corroded.

[0006] To achieve the above-mentioned purpose, the present invention proposes a wet linear stepper motor, comprising a casing, and an armature and a motor rotor arranged inside the casing, a coil being wound on the armature with enameled wire, and also comprising an electrical connector and a conducting wire; the terminal of the enameled wire is peeled and then wrapped around the core of the first end of the conducting wire and welded, a first dielectric-resistant insulating sleeve is sleeved on the connecting portion between the terminal of the enameled wire and the conducting wire, and a first insulating impregnating resin is filled in the first dielectric-resistant insulating sleeve; an electrical connector mounting seat is integrally formed on the casing, and the electrical connector is welded to the mouth of the electrical connector mounting seat; an electrical connector soldering cup is arranged at the tail end of the electrical connector, and the core of the second end of the conducting wire is inserted into the blind hole of the electrical connector soldering cup and welded; a second dielectric-resistant insulating sleeve is sleeved on the connecting portion between the second end of the conducting wire and the electrical connector soldering cup, and a second insulating impregnating resin is filled in the second dielectric-resistant insulating sleeve.

[0007] Preferably, the electrical connector solder cup, the second dielectric-resistant insulating sleeve, the second insulating impregnating resin and the second end of the wire together form an electrical connector solder joint sealing insulating structure, the inner hole of the electrical connector mounting seat is filled with epoxy resin, and the electrical connector solder joint sealing insulating structure is wrapped inside the epoxy resin.

[0008] Preferably, a plurality of annular grooves are provided on the inner wall of the electrical connector mounting seat, and the epoxy resin is filled into the annular grooves.

[0009] Preferably, the connection end of the enameled wire is peeled and then wrapped around the wire core of the first end of the wire and then wrapped with an insulating rope or insulating tape.

[0010] Preferably, a receiving countersunk hole is provided at the mouth of the electrical connector mounting seat, and the electrical connector is embedded in the receiving countersunk hole and welded.

[0011] Preferably, an end cover is installed inside the casing, and the end cover includes an outer ring body, an inner ring body and a bracket mounting portion, the inner ring body is coaxially arranged at the center of the outer ring body, and the right ends of the inner ring body and the outer ring body are connected by a connecting wall; the bracket mounting portion is integrally formed on the right end surface of the connecting wall; a second stop is provided on the outer peripheral surface of the left end of the inner ring body; an annular body is integrally formed on the inner surface of the left side wall of the casing; a first stop is provided on the outer peripheral surface of the right end of the annular body; the left and right ends of the armature inner hole are respectively sleeved on the first stop and the second stop.

[0012] Preferably, the motor rotor includes a screw shaft and a magnetic pole assembly mounted on the screw shaft; the magnetic pole assembly is arranged in the inner hole of the armature; a left bearing and a right bearing are sleeved on the screw shaft, and the left bearing and the right bearing are respectively located on both sides of the magnetic pole assembly; the outer ring of the left bearing is installed in the inner hole of the annular body, and the outer ring of the right bearing is installed in the inner hole of the inner ring body.

[0013] Preferably, the right half of the screw shaft is set as a screw, and a screw nut is screwed on the screw; the left half of the screw nut is a prism with a rectangular cross-section, and two symmetrical outer surfaces of the prism are set as steel ball contact surfaces; two guide rail brackets are installed in the inner hole of the bracket mounting portion, and a steel ball accommodating groove is provided on the surface of the guide rail bracket opposite to the steel ball contact surface, and a steel ball is rollingly installed in the steel ball accommodating groove, and the steel ball is in point contact with the steel ball contact surface on the screw nut.

[0014] Preferably, a connecting plate is integrally formed on the guide rail bracket; a mounting groove is provided on the right end surface of the bracket mounting portion; the connecting plate is embedded in the mounting groove, and the connecting plate and the bracket mounting portion are fastened together by screws.

[0015] Preferably, a plurality of drain ports are provided on the bracket mounting portion.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0017] (1) In the present invention, the first dielectric-resistant insulating sleeve is filled with a first insulating impregnating resin, and the welding part between the enameled wire and the conductor is wrapped inside the first insulating impregnating resin, thereby effectively preventing the welding part between the enameled wire and the conductor from being corroded and causing insulation degradation or failure to work; in addition, the second dielectric-resistant insulating sleeve is filled with a second insulating impregnating resin, and the welding part between the conductor and the electrical connector welding cup is wrapped inside the second insulating impregnating resin, thereby effectively preventing the welding part between the conductor and the electrical connector welding cup from being corroded. By adopting the above structure, it is beneficial to improve the corrosion resistance of the wet linear stepper motor.

[0018] (2) In the present invention, epoxy resin is filled in the inner hole of the electric connector mounting seat, and the electric connector solder joint sealing insulation structure is wrapped inside the epoxy resin, and a plurality of annular grooves are opened on the inner wall of the electric connector mounting seat and the epoxy resin is filled into the annular grooves. The epoxy resin in the annular grooves forms an axial limiting structure, which limits the axial position of the entire epoxy resin in the electric connector mounting seat, thereby improving the pressure resistance performance of the wet linear stepper motor.

[0019] (3) In the present invention, the motor shaft and the lead screw nut are integrated into one, the right half of the lead screw shaft is set as a screw rod, and the lead screw nut is screwed on the screw rod; the left half of the lead screw nut is a prism with a rectangular cross-section, and two symmetrical outer surfaces of the prism are set as steel ball contact surfaces and steel balls are rollingly installed in the steel ball receiving grooves of two guide rail brackets, so as to realize the linear motion of the stepper motor, thereby reducing the volume and weight of the high-humidity linear stepper motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a front view of the wet linear stepping motor provided by the present invention;

[0022] Figure 2 A cross-sectional view of the wet linear stepping motor provided by the present invention;

[0023] Figure 3 It is a schematic diagram of the insulation structure of the armature welding point formed by connecting the enameled wire and the conducting wire in the present invention;

[0024] Figure 4 A diagram of the sealing and insulating structure of the welding point of the electric connector formed by connecting the wire and the welding cup of the electric connector in the present invention;

[0025] Figure 5 It is a schematic diagram after epoxy resin is poured into the electrical connector mounting seat in the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the motor rotor in the present invention;

[0027] Figure 7 It is a schematic diagram of the guide rail bracket after being installed on the bracket installation part in the present invention;

[0028] Figure 8 for Figure 7 Sectional view of AA in the middle;

[0029] Fig. 9 It is a front view of the guide rail bracket in the present invention;

[0030] Fig.10 It is a left side view of the guide rail bracket in the present invention;

[0031] Fig.11 for Fig.10 Cross-sectional view of the middle BB;

[0032] Fig.12 It is a main cross-sectional view of the lead screw nut in the present invention;

[0033] Fig.13 It is a right side view of the lead screw nut in the present invention;

[0034] Fig.14 It is a main cross-sectional view of the end cover in the present invention;

[0035] Fig.15 It is a right side view of the end cover in the present invention;

[0036] Fig.16 It is a top view of the end cover in the present invention.

[0037] Explanation of the accompanying symbols: 1. Guide rail bracket; 1a. Connecting plate; 1b. Steel ball receiving groove; 2. Steel ball; 3. Bolt; 4a. Left bearing; 4b. Right bearing; 5. Housing; 5a. Electrical connector mounting seat; 5b. Annular groove; 5c. Accommodating countersunk hole; 5d. Ring body; 5e. First stopper; 6. Armature; 61. Insulating rope or insulating cloth tape; 62. Enameled wire; 7. Epoxy resin; 8. Electrical connector; 8a. Electrical connector welding cup; 9. End cover; 9a. Outer ring body; 9b. Bracket mounting portion; 9c. Inner ring body; 9d. Second stopper; 9e. Mounting groove; 9f. Drain port ; 9g, connecting wall; 9h, armature end accommodating groove; 9i, wiring harness through hole; 9j, bolt through hole; 9k, screw hole; 9n, internal thread; 10, annular baffle; 11, nut; 12, screw nut; 12a, steel ball contact surface; 13, wire; 14, first dielectric-resistant insulating sleeve; 15, first insulating impregnating resin; 16, second dielectric-resistant insulating sleeve; 17, second insulating impregnating resin; 18, electrical connector solder joint sealing insulation structure; 19, screw shaft; 19a, retaining ring; 20, pole assembly; 21, screw; 22, sleeve; 23, retaining ring; 24, key. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] As shown in the accompanying drawings, a wet linear stepper motor includes a housing 5, an armature 6 and a motor rotor arranged inside the housing 5, a coil is wound on the armature 6 using enameled wire 62, and also includes an electrical connector 8 and a wire 13.

[0042] Combination Figure 3 As shown, the terminal of the enameled wire 62 is peeled and then wound around the wire core of the first end of the wire 13 and welded, and a first dielectric-resistant insulating sleeve 14 is sleeved at the connection portion between the terminal of the enameled wire 62 and the wire 13, and a first insulating impregnating resin 15 is filled in the first dielectric-resistant insulating sleeve 14. Furthermore, the terminal of the enameled wire 62 is peeled and then wound around the wire core of the first end of the wire 13 and then wound with an insulating rope or insulating tape 61. In this embodiment, the first dielectric-resistant insulating sleeve 14 and the enameled wire 62, wire 13, insulating rope or insulating tape 61, and first insulating impregnating resin 15 inside it together constitute an armature welding point insulation structure. Specifically, the assembly method of the armature welding point insulation structure is as follows: first, remove the insulation skin of the connection end of the enameled wire 62 and wrap it around the wire core of the first end of the conductor 13, and then weld it firmly with solder, and then tightly wrap the insulating rope or insulating cloth tape 61 outside the enameled wire 62, and then completely immerse the entire welding point in the insulating impregnating resin and take it out to dry, repeating it many times to increase the amount of paint, and wrapping the insulating rope or insulating cloth tape 62 can increase the amount of paint. Then put on the first dielectric-resistant insulating sleeve 14, and then fill the first dielectric-resistant insulating sleeve 14 with the first insulating impregnating resin 15 to wrap the welding part of the enameled wire 62 and the conductor 13 inside, so that the insulation treatment of the armature welding point is achieved, and the corrosion resistance and insulation resistance of the welding part of the enameled wire 62 and the conductor 13 are improved.

[0043] Combination Figure 1 , Figure 2 and Figure 4As shown, an electric connector mounting seat 5a is integrally formed on the housing 5, and the electric connector 8 is welded to the mouth of the electric connector mounting seat 5a; an electric connector soldering cup 8a is provided at the tail end of the electric connector 8, and the wire core of the second end of the wire 13 is inserted into the blind hole of the electric connector soldering cup 8a and soldered; a second dielectric-resistant insulating sleeve 16 is sleeved at the connection portion between the second end of the wire 13 and the electric connector soldering cup 8a, and a second insulating impregnating resin 17 is filled in the second dielectric-resistant insulating sleeve 16. The electric connector soldering cup 8a, the second dielectric-resistant insulating sleeve 16, the second insulating impregnating resin 17 and the second end of the wire 13 together form an electric connector solder joint sealing insulating structure 18. The assembly method of the electrical connector solder joint sealing insulating structure 18 is as follows: before welding, first place a second insulating impregnating resin 17 of appropriate length on the wire 13, solder the wire core of the second end of the wire 13 to the electrical connector solder cup 8a through solder, and then move the second insulating impregnating resin 17 to the solder joint position, pour the second insulating impregnating resin 17, and make the second insulating impregnating resin 17 completely filled with the second insulating impregnating resin 17, so that the bonding treatment of the electrical connector solder joint is realized, thereby improving the corrosion resistance of the part where the wire 13 and the electrical connector solder cup 8a are welded.

[0044] Combination Figure 2 and Figure 5 As shown, the inner hole of the electrical connector mounting seat 5a is filled with epoxy resin 7, and the electrical connector solder joint sealing insulating structure 18 is wrapped inside the epoxy resin 7. Furthermore, a plurality of annular grooves 5b are provided on the inner wall of the electrical connector mounting seat 5a, and the epoxy resin 7 is filled into the annular grooves 5b. The epoxy resin filled in the annular grooves 5b forms an axial limiting structure, which is used to limit the axial position of the overall structure formed by the epoxy resin 7 in the electrical connector mounting seat, thereby improving the pressure resistance of the wet linear stepper motor. In addition, the epoxy resin 7 wraps the electrical connector solder joint sealing insulating structure 18 inside, further improving the corrosion resistance of the part where the wire 13 is welded to the electrical connector solder cup 8a.

[0045] Combination Figure 5 As shown, in order to facilitate the installation and welding of the electric connector 8, an accommodating countersunk hole 5c is provided at the mouth of the electric connector mounting seat 5a, and the electric connector 8 is embedded in the accommodating countersunk hole 5c and welded.

[0046] Combination Figure 5 As shown, in order to ensure the regularity of the wires inside the motor, all the wires 13 are inserted into 22 , and the end of the sleeve 22 is buried inside the epoxy resin 7 .

[0047] In this embodiment, the installation method of the electrical connector 8 is as follows: Figure 4After the assembly of the electrical connector solder joint sealing insulation structure 18 is completed, the electrical connector 8 is then installed in the receiving countersunk hole 5c at the mouth of the electrical connector mounting seat 5a. The electrical connector 8 is first fixed to the receiving countersunk hole 5c by spot welding, and then the welding machine energy is adjusted to achieve a certain welding depth between the electrical connector 8 and the side wall of the receiving countersunk hole 5c to ensure that the welding point is resistant to high-pressure corrosive media and leakage rate requirements. After the welding of the electrical connector 8 meets the requirements, the tail end of the electrical connector 8 is potted with epoxy resin 7 from the front end of the motor. At the same time, an annular groove 5b is opened on the inner wall of the electrical connector mounting seat 5a. The potted epoxy resin 7 is required to fill the annular groove 5b to ensure the reliability, sealing and insulation of the solder joint treatment after the epoxy resin 7 is potted.

[0048] Combination Figure 2 , Figures 14 to 16 As shown, an end cover 9 is installed inside the housing 5, and the end cover 9 includes an outer ring body 9a, an inner ring body 9c and a bracket mounting portion 9b. The inner ring body 9c is coaxially arranged at the center of the outer ring body 9a, and the inner ring body 9c is connected to the right end of the outer ring body 9a through a connecting wall 9g; the bracket mounting portion 9b is integrally formed on the right end surface of the connecting wall 9g; a second stop 9d is arranged on the outer peripheral surface of the left end of the inner ring body 9c; an annular body 5d is integrally formed on the inner surface of the left side wall of the housing 5; a first stop 5e is arranged on the outer peripheral surface of the right end of the annular body 5d; the left and right ends of the inner hole of the armature 6 are respectively sleeved on the first stop 5e and the second stop 9d. The first stop 5e and the second stop 9d are positioned to ensure the requirement of small air gap between the stator and rotor of the stepping motor, and the traditional stepping motor positioning method of positioning the outer circle of the armature and the inner hole of the housing is abandoned.

[0049] In this embodiment, the outer ring body 9a, the inner ring body 9c, the bracket mounting portion 9b, and the connecting wall 9g are an integrally formed structure, and the annular groove formed between the outer ring body 9a and the inner ring body 9c is used as the armature end accommodating groove 9h. The end of the right end of the armature 6 is inserted into the armature end accommodating groove 9h. Furthermore, a wiring harness through hole 9i is opened on the outer ring body 9a, and the wiring harness through hole 9i is a U-shaped groove structure, forming an open wire harness through hole, which is convenient for ensuring the normal installation of the motor and has detachability.

[0050] In this embodiment, a bolt through hole 9j is provided on the connecting wall 9g, and the end cover 9 is connected to the casing 5 by a bolt 3. Specifically, the bolt 3 passes through the screw through hole 9j, the armature 6, and the left side wall of the casing 5 in sequence and is then locked by screwing a nut.

[0051] Combination Figure 2 and Figure 6As shown, the motor rotor includes a screw shaft 19 and a magnetic pole assembly 20 mounted on the screw shaft 19; the magnetic pole assembly 20 is arranged in the inner hole of the armature 6; a left bearing 4a and a right bearing 4b are sleeved on the screw shaft 19, and the left bearing 4a and the right bearing 4b are respectively located on both sides of the magnetic pole assembly 20; the outer ring of the left bearing 4a is installed in the inner hole of the annular body 5d, and the outer ring of the right bearing 4b is installed in the inner hole of the inner ring body 9c. The left bearing 4a and the right bearing 4b are both angular contact bearings.

[0052] Combination Figure 6 As shown, the magnetic pole assembly 20 includes a magnetic pole I 20a, a magnetic steel 20b, and a magnetic pole II 20c which are sequentially sleeved on the screw shaft 19; a retaining ring 19a is integrally formed on the screw shaft 19, and the groove on the right end face of the magnetic pole II 20c abuts against the retaining ring 19a, and a retaining ring 23 is sleeved on the screw shaft 19, and a pin is inserted between the retaining ring 23 and the screw shaft 19, and the retaining ring 23 is used to abut against the groove on the left end face of the magnetic pole I 20a. The retaining ring 23 and the retaining ring 19a form an axial limit for the entire magnetic pole assembly 20. In addition, a key 24 is installed between the inner hole of the magnetic pole assembly 20 and the screw shaft 19 to prevent the magnetic pole assembly 20 from rotating around the axis of the screw shaft 19. There are 50 small teeth distributed on the outer circumference of the magnetic pole I 20a and the magnetic pole II 20c, and the small teeth of the magnetic pole I 20a and the magnetic pole II 20c are staggered by half a tooth pitch. The magnet 20b is axially magnetized. The magnetic pole I 20a, the magnetic pole II 20c, and the magnet 20b together constitute the permanent magnet part of the stepping motor. The magnetic flux generated by the armature 6 when it is energized interacts with the rotor magnet to generate electromagnetic torque; each time the motor changes its power state, the rotor rotates a step angle; when the change of the power state completes a cycle, the rotor rotates a tooth pitch.

[0053] Combination Figure 2 , Figures 6 to 12 As shown, the right half of the screw shaft 19 is set as a screw rod, and a screw nut 12 is screwed on the screw rod; the left half of the screw nut 12 is a prism with a rectangular cross section, and two symmetrical outer surfaces of the prism are set as steel ball contact surfaces 12a; two guide rail brackets 1 are installed in the inner hole of the bracket mounting portion 9b, and a steel ball receiving groove 1b is set on the surface of the guide rail bracket 1 opposite to the steel ball contact surface 12a, and a steel ball 2 is rollingly installed in the steel ball receiving groove 1b, and the steel ball 2 is in point contact with the steel ball contact surface 12a on the screw nut 12. By using the guide rail bracket 1 and the steel ball 2, a circumferential limiting structure is formed for the screw nut 12, which is used to limit the rotation of the screw nut 12 around the circumference of the screw shaft 19. At the same time, the position of the guide rail bracket 1 can be adjusted by fixing the screw of the guide rail bracket 1, and then the rotation of the screw nut 12 can be limited by the steel ball 2, so as to eliminate the starting error and return error of the screw nut 12.

[0054] In this embodiment, two steel ball accommodating grooves 1b are provided on each guide rail bracket 1, and the length and width of the steel ball accommodating groove 1b are M×N, and the depth is H; 7 steel balls 2 are placed in each steel ball accommodating groove 1b. The steel ball 2 is in point contact with the steel ball contact surface 12a of the lead screw nut 12, which ensures the smooth axial movement of the lead screw nut 12, prevents circumferential rotation, and realizes the precise position of the movement position of the lead screw nut 12. The steel ball 2 is rotatably installed in the steel ball accommodating groove 1b, and the depth H of the steel ball accommodating groove 1b is less than the diameter of the steel ball 2, so that after the guide rail bracket 1 in which the steel ball 2 is placed is installed on the end cover 9, only the steel ball 2 is in contact with the steel ball contact surface 12a of the lead screw nut 12, and the guide rail bracket 1 is not in contact with the lead screw nut 12. At the same time, it is required that the steel ball 2 will not fall off during the movement of the lead screw nut 12. Each steel ball contact surface 12a forms a sliding pair with two rows of steel balls 2, which together reduce the friction of the lead screw nut 12 and improve the output force and efficiency of the motor.

[0055] In this embodiment, the left end of the screw shaft 19 is used to install the magnetic pole assembly 20, and the right end is used to install the screw nut 12. Therefore, the screw shaft 19 integrates the screw and the rotor shaft in the traditional linear stepper motor into one, realizing the design requirements of miniaturization and simplified structure.

[0056] Combination Figures 7 to 11 , Figures 14 to 16 As shown, the guide rail bracket 1 is integrally formed with a connecting plate 1a; a mounting groove 9e is provided on the right end surface of the bracket mounting portion 9b; the connecting plate 1a is embedded in the mounting groove 9e, and the connecting plate 1a and the bracket mounting portion 9b are fastened and connected by screws 21. Specifically, a screw hole 9k is provided at the bottom of the mounting groove 9e, and after the connecting plate 1a is embedded in the mounting groove 9e, the screw 21 passes through the connecting plate 1a and is tightened in the screw hole 9k.

[0057] Combination Fig.16 As shown, a plurality of drain ports 9f are provided on the bracket mounting portion 9b. In order to prevent the front and rear ends of the lead screw nut 12 from generating a pressure difference when the lead screw nut 12 moves in a high-pressure corrosive medium, the drain ports 9f are provided to eliminate the pressure difference between the front and rear ends of the lead screw nut 12.

[0058] Combination Figure 2 and Fig.14As shown, the right end of the inner hole of the inner ring body 9c of the end cover 9 is provided with an internal thread 9n, and an annular baffle 10 and a nut 11 are sleeved on the screw shaft 9. The right end face of the inner ring of the left bearing 4a abuts against the retaining ring 23, the left end of the inner ring of the right bearing 4b abuts against the retaining ring 19a of the screw shaft 19, the annular protrusion on the left end face of the annular baffle 10 abuts against the right end face of the outer ring of the right bearing 4b, the external thread on the outer peripheral surface of the nut 11 is screwed into the internal thread 9n of the inner ring body 9c, and the left end face of the nut 11 is pressed against the right end face of the annular baffle 10.

[0059] In this embodiment, the armature 6 is installed into the interface 5 to form the motor stator. According to the characteristic that the air gap between the stator and the rotor of the stepping motor is very small, and in combination with the requirements for lead-out and potting of the motor wires, the gap is not ensured by using the matching dimensions of the inner hole of the casing 5 and the outer circle of the armature 6. Instead, the gap between the stator and the rotor is ensured by using the left and right ends of the inner hole of the armature 6 to be respectively mounted on the first stop 5e and the second stop 9d.

[0060] The wet linear stepper motor provided in this embodiment has the following assembly process: first, the enameled wire 62 on the armature 6 is connected to the wire 13, and then the armature 6 is installed in the housing 5 to form the motor stator. Then, the wire 13 is passed through the inner hole of the electrical connector mounting seat 5a and connected to the electrical connector welding cup 8a of the electrical connector 8 to form the electrical connector welding point sealing insulation structure 18. Then, the electrical connector 8 is welded in the receiving counterbore 5c of the electrical connector mounting seat 5a, and then the epoxy resin 7 is poured. After applying a certain amount of grease to the inner and outer ring steel balls of the left bearing 4a and other parts, all of them are placed in the inner hole of the annular body 5d inside the housing 5, and then the motor rotor with the end cover 9 and the right bearing 4b installed is installed in the motor stator, and the bolts 3, the annular baffle 10 and the nut 11 are installed. Finally, the lead screw nut 12 and the guide rail bracket 1 are installed.

[0061] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A wet linear stepping motor, comprising a housing (5), an armature (6) and a motor rotor arranged inside the housing (5), wherein a coil is wound on the armature (6) using an enameled wire (62); characterized in that: Also includes an electrical connector (8) and a wire (13); The wiring end of the enameled wire (62) is peeled and wound around the wire core of the first end of the wire (13) and welded; a first dielectric-resistant insulating sleeve (14) is sleeved at the connection portion between the wiring end of the enameled wire (62) and the wire (13); and a first insulating impregnating resin (15) is filled in the first dielectric-resistant insulating sleeve (14); An electrical connector mounting seat (5a) is integrally formed on the housing (5), and the electrical connector (8) is welded to the mouth of the electrical connector mounting seat (5a); an electrical connector soldering cup (8a) is provided at the tail end of the electrical connector (8), and the wire core of the second end of the wire (13) is inserted into the blind hole of the electrical connector soldering cup (8a) and welded; a second dielectric-resistant insulating sleeve (16) is sleeved at the connection portion between the second end of the wire (13) and the electrical connector soldering cup (8a), and a second dielectric-resistant insulating sleeve (16) is filled with a second insulating impregnating resin (17).

2. A wet linear stepper motor as claimed in claim 1, characterized in that: The electrical connector solder cup (8a), the second dielectric-resistant insulating sleeve (16), the second insulating impregnating resin (17) and the second end of the wire (13) together form an electrical connector solder joint sealing insulating structure (18); the inner hole of the electrical connector mounting seat (5a) is filled with epoxy resin (7), and the electrical connector solder joint sealing insulating structure (18) is wrapped inside the epoxy resin (7).

3. A wet linear stepper motor as claimed in claim 2, characterized in that: A plurality of annular grooves (5b) are provided on the inner wall of the electrical connector mounting seat (5a), and the epoxy resin (7) is filled into the annular grooves (5b).

4. A wet linear stepper motor as claimed in claim 1, characterized in that: The connection end of the enameled wire (62) is peeled and then wound around the wire core of the first end of the conductor (13) and then wrapped with an insulating rope or insulating cloth tape (61).

5. A wet linear stepper motor as claimed in claim 1, characterized in that: An accommodating countersunk hole (5c) is provided at the mouth of the electrical connector mounting seat (5a), and the electrical connector (8) is embedded in the accommodating countersunk hole (5c) and welded.

6. A wet linear stepper motor as claimed in claim 1, characterized in that: An end cover (9) is installed inside the housing (5), and the end cover (9) comprises an outer ring body (9a), an inner ring body (9c) and a bracket mounting portion (9b); the inner ring body (9c) is coaxially arranged at the center of the outer ring body (9a), and the inner ring body (9c) and the right end of the outer ring body (9a) are connected via a connecting wall (9g); the bracket mounting portion (9b) is integrally formed on the right end surface of the connecting wall (9g); and a second stopper (9d) is arranged on the outer peripheral surface of the left end of the inner ring body (9c); An annular body (5d) is integrally formed on the inner surface of the left side wall of the housing (5); a first stopper (5e) is provided on the outer peripheral surface of the right end of the annular body (5d); and the left and right ends of the inner hole of the armature (6) are respectively sleeved on the first stopper (5e) and the second stopper (9d).

7. A wet linear stepper motor as claimed in claim 6, characterized in that: The motor rotor comprises a screw shaft (19) and a magnetic pole assembly (20) mounted on the screw shaft (19); the magnetic pole assembly (20) is arranged in the inner hole of the armature (6); a left bearing (4a) and a right bearing (4b) are sleeved on the screw shaft (19), and the left bearing (4a) and the right bearing (4b) are respectively located on both sides of the magnetic pole assembly (20); the outer ring of the left bearing (4a) is mounted in the inner hole of the annular body (5d), and the outer ring of the right bearing (4b) is mounted in the inner hole of the inner ring body (9c).

8. A wet linear stepper motor as claimed in claim 7, characterized in that: The right half of the screw shaft (19) is configured as a screw rod, and a screw nut (12) is screwed onto the screw rod; The left half of the lead screw nut (12) is a prism with a rectangular cross section, and two symmetrical outer surfaces of the prism are arranged as steel ball contact surfaces (12a); Two guide rail brackets (1) are installed in the inner hole of the bracket installation part (9b), a steel ball receiving groove (1b) is provided on the surface of the guide rail bracket (1) opposite to the steel ball contact surface (12a), and a steel ball (2) is rollingly installed in the steel ball receiving groove (1b), and the steel ball (2) is in point contact with the steel ball contact surface (12a) on the lead screw nut (12).

9. A wet linear stepper motor as claimed in claim 8, characterized in that: A connecting plate (1a) is integrally formed on the guide rail bracket (1); A mounting groove (9e) is provided on the right end surface of the bracket mounting portion (9b); the connecting plate (1a) is embedded in the mounting groove (9e), and the connecting plate (1a) and the bracket mounting portion (9b) are fastened together by screws (21).

10. A wet linear stepper motor as claimed in claim 6, characterized in that: A plurality of drain ports (9f) are provided on the bracket mounting portion (9b).

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