Shielding type valve electric driving device

Abstract

The invention belongs to a valve opening and closing driving device, and particularly relates to a shielding type valve electric driving device. A shielding type valve electric driving device comprises a machine shell assembly, a rotor assembly, a speed reducer shell assembly and a speed reducer assembly. The rotor assembly is arranged on the speed reducer shell assembly in a sleeving manner; the rotor assembly and the speed reducer assembly are connected in series; a speed reducer shell assembly is arranged outside the speed reducer assembly; a machine shell assembly is arranged outside the speed reducer shell assembly. The shielding type valve electric driving device is reasonable in design, simple and compact in structure and convenient to operate, maintain and repair, and the shielding type valve electric driving device which is stable in performance and efficient is provided for automatic control and automatic flow adjustment of valves needed by petroleum, chemical engineering, nuclear power and the like.

Description

Technical Field

[0001] The invention belongs to a driving device for opening and closing a valve, and in particular relates to a shielded valve electric driving device. Background Art

[0002] With the continuous development of automation technology, in order to reduce the labor intensity of staff and improve work efficiency, all walks of life have an increasing demand for various valve automatic drive devices, and also need to realize automatic control of valves. Some automation equipment such as atomic energy, aerospace, petroleum, chemical industry, light industry, food, etc. need to transport special liquids with toxicity, corrosiveness, high temperature, high pressure, etc. Due to the danger of these liquids, they often need to automatically switch valves to achieve control of liquids during operation. This requires a drive device to drive the valve to open and close automatically, and at the same time ensure that the transported liquid is leak-free. At present, some companies have researched and developed related drive devices, but they are all driven by non-standard servo and stepper motors. There are generally problems such as complex structure, low driving efficiency, poor stability, and some drive devices have problems such as inaccurate positioning of the switch valve, impact jamming in place, and poor reverse self-locking performance, which cannot meet the actual needs of production. The present invention is a valve electric drive device based on a shielded three-phase AC asynchronous motor and a planetary gear reducer with a small tooth difference. Its structural features are: the output shaft of the motor is the input shaft of the planetary gear system, the output shaft of the planetary gear system directly drives the valve core shaft, a non-magnetic shielding sleeve is used to isolate the motor rotor and stator, a balance block is provided on the rotor eccentric shaft, which solves the problem of vibration reduction and noise reduction, and a bidirectional inclined surface is provided on the surface above the balance block, and a center hole is provided on the rotor shaft, so that the medium can circulate well in the device, solving the problem of lubrication and cooling of gears and bearings; a magnetic block is provided at one end of the rotor shaft, which can generate a pulse current with the multiple coils on the outside of the shielding sleeve to calculate the number of rotor revolutions, so as to confirm whether the valve is opened or closed. During installation and use, the drive device is directly connected to the valve housing with a static sealing structure, and no dynamic sealing structure is required in the overall structure, so there is no leakage problem. At the same time, after the valve is opened or closed, the motor stops rotating. At this time, the reverse transmission self-locking property of the planetary gear system can ensure the reliability of the switch state and meet the needs of automatic control of valve switches in special liquid input devices. The invention has reasonable design, simple and compact structure, convenient operation and maintenance, and provides a stable and efficient shielded valve electric drive device for the needs of automatic control of valves and automatic flow regulation in petroleum, chemical industry, nuclear power, etc. Summary of the invention

[0003] The present invention aims to avoid the shortcomings and deficiencies in the above-mentioned technologies and provide a shielded valve electric drive device, which, when installed in combination with a valve, has the characteristics of no gasket, no filler, zero leakage, maintenance-free, strong radiation resistance, high insulation and heat resistance level, long service life, etc. The present invention is not only reasonably designed, simple and compact in structure, but also easy to operate, maintain and repair.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a shielded valve electric drive device includes a casing assembly, a rotor assembly, a reducer housing assembly and a reducer assembly; the rotor assembly is sleeved on the reducer housing assembly; the rotor assembly and the reducer assembly are arranged in series; a reducer housing assembly is arranged outside the reducer assembly; a casing assembly is arranged outside the reducer housing assembly; the reducer assembly includes a balancing block A, a duplex gear bearing A, a duplex gear, a duplex gear bearing B, and a balancing block B; a balancing block A is arranged at one end of the duplex gear; a balancing block B is arranged at the other end of the duplex gear; a duplex gear bearing A is arranged on one side of the inner cavity of the duplex gear; a duplex gear bearing B is arranged on the other side of the inner cavity of the duplex gear.

[0005] Furthermore, the reducer housing assembly includes a reinforcement ring, a shielding sleeve, a fixed gear, an output gear, an output gear bearing A, an output gear bearing B and a round nut B; the output gear is installed on the inner side of the fixed gear through the output gear bearing A and the output gear bearing B; the sleeve is arranged between the output gear bearing A and the output gear bearing B; the round nut B is threadedly connected to the output gear; the output gear bearing B is limited by the round nut B; the outer side of the fixed gear is fixedly connected to one end of the shielding sleeve; and a reinforcement ring is arranged at the other end of the shielding sleeve.

[0006] Furthermore, it also includes a stop washer B, a sleeve, a spring clamp for a hole and a screw B; the spring clamp for the hole is placed in the inner hole groove of the fixed gear; one side of the spring clamp for the hole is in contact with the side of the outer ring of the bearing B; the sleeve and the stop washer B are arranged between the bearing B and the round nut B; the sleeve is sleeved on the output gear; a stop washer B is arranged on one side of the sleeve; the fixed gear is fixedly connected to the shielding sleeve by a screw B.

[0007] Furthermore, the rotor assembly includes an induction coil, a magnetic block, a rotor bearing A, a rotor bearing B, a rotor, a stator, a stator winding, a rotor shaft and a round nut A; a stator is arranged on the stator winding; the rotor is supported by the rotor bearing A and the rotor bearing B through the rotor shaft; a magnetic block is arranged at one end of the rotor shaft; and the other end of the rotor shaft is threadedly connected to the round nut A.

[0008] Furthermore, it also includes a stop gasket A, an induction coil is arranged outside the closed end of the shielding sleeve; the magnetic block is radially opposite to the induction coil; the double gear is installed on the eccentric shaft of the rotor shaft through the double gear bearing A and the double gear bearing B; the double gear bearing A and the double gear bearing B on the eccentric shaft of the rotor shaft are respectively installed with a balance block A and a balance block B on both sides, and the stop gasket A is arranged between the round nut A and the balance block B; the stop gasket A and the round nut A axially fix the balance block B.

[0009] Furthermore, the rotor shaft and the reducer planetary gear shaft are designed in an integrated manner; a central through hole passing through the axis of the rotor shaft is provided on the rotor shaft and the integral non-concentric planetary gear shaft.

[0010] Furthermore, the upper surfaces of the balancing block A and the balancing block B are both provided with bidirectional inclined surfaces.

[0011] Furthermore, the housing assembly includes a base, screws A, a cover and a junction box; a junction box is provided on one side of the base; and the cover is fixed to one end of the base by screws A.

[0012] Furthermore, it also includes a positioning pin, and the stator with the stator winding is embedded in the base and fixedly connected by the positioning pin; a shielding sleeve is provided on the inner side of the stator; the closed end of the shielding sleeve is supported and restricted by one end of the base, and the other end of the shielding sleeve is fixedly connected to the base by a screw C; a terminal box for the stator winding is provided on the outer side of the base.

[0013] Furthermore, it also includes an O-ring, and a radial O-ring is provided between the shielding sleeve and the base.

[0014] The characteristics of the present invention are: 1. It adopts shielded three-phase AC asynchronous motor and small-tooth-difference planetary gear reducer drive. A stator shielding sleeve is provided on the inner side of the motor stator to completely isolate the stator from the medium. 2. The electric drive device and the valve can be sealed with a gasket-free rigid seal and connected by nuts and studs, which is a completely leak-free structure; 3. Two balancing blocks A and B are installed on the eccentric shaft of the rotor shaft. By adjusting the mass of balancing blocks A and B, the dynamic balancing accuracy requirements can be met to improve the stability of system operation; 4. The rotor shaft and the reducer planetary gear shaft are designed as an integrated whole. A central through hole passing through the rotor shaft axis is designed on the rotor shaft and the planetary gear shaft that is not concentric with it. Under the joint action of the bidirectional inclined surfaces above the balance block A and the balance block B, the medium forms an axial circulation around the rotor periphery and the central through hole, which can effectively cool and lubricate the gears and bearings. 5. A magnetic block is provided at one end of the rotor shaft, which can generate a pulse current with the multiple coils on the outside of the shielding sleeve to calculate the number of rotor revolutions in order to confirm whether the valve is opened or closed.

[0015] The invention has reasonable design, simple and compact structure, convenient operation and maintenance, and provides a stable and efficient shielded valve electric drive device for the needs of automatic control of valves and automatic flow regulation in petroleum, chemical industry, nuclear power, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] The present invention has 7 drawings, among which: Attached Figure 1 It is a schematic diagram of the main structure of a specific embodiment of the present invention; Attached Figure 2 It is a schematic diagram of the rotor and the planetary gear train reducer with small tooth difference integrated in the shielding sleeve; Attached Figure 3 is a schematic diagram of a shielding sleeve; Attached Figure 4 is a schematic diagram of the rotor shaft; Attached Figure 5 is a schematic diagram of the internal gear structure of the output gear; Attached Figure 6 It is a schematic diagram of the end face tooth groove structure of the output gear; Attached Figure 7 This is a bottom view of the balancing block at the upper end of the eccentric shaft; Attached Figure 8 This is the main view of the balancing block at the upper end of the eccentric shaft; Attached Fig. 9 It is a cross-sectional view of the balancing block at the upper end of the eccentric shaft; Attached Fig.10 This is a bottom view of the balancing block at the lower end of the eccentric shaft; Attached Fig.11 This is the main view of the balance block at the lower end of the eccentric shaft; Attached Fig.12 It is a cross-sectional view of the balance block at the lower end of the eccentric shaft; Attached Fig.13 Yes Figure 1 A partial enlarged view of 1. Base, 2. Rotor shaft, 3. Rotor, 4. Stator, 5. Stator winding, 6. Rotor bearing A, 7. Induction coil, 8. Cover, 9. Screw A, 10. Magnetic block, 11. Terminal box, 12. Positioning pin, 13. Rotor bearing B, 14. Balance block A, 15. Reinforcement ring, 16. Duplex gear bearing A, 17. Duplex gear, 18. Duplex gear bearing B, 19. Balance block B, 20. Fixed gear, 21. Stop washer A, 22. Round nut A , 23. Shielding sleeve, 24. Screw B, 25. Spring retaining ring for hole, 26. Bushing, 27. Output gear, 28. Stop washer B, 29. Round nut B, 30. Output gear bearing B, 31. Sleeve, 32. Output gear bearing A, 33. Screw C, 34. O-ring, 35. Center through hole, 36. Inclined surface 1, 37. Inclined surface 2. DETAILED DESCRIPTION

[0018] The present invention belongs to a valve opening and closing driving device, which adopts a shielded three-phase AC asynchronous motor and a planetary gear train reducer with a small tooth difference to drive the valve. A stator shielding sleeve is provided on the inner side of the stator of the shielded three-phase asynchronous motor. The electric driving device and the valve can be rigidly sealed without a gasket and connected by nuts and studs to achieve the requirement of completely no leakage of the valve. The shielded valve electric driving device of the present invention can be used for driving ball valves and gate valves, and can also realize the control of valve opening and closing and opening flow regulation. It is suitable for the control of liquid and gas delivery systems with strict no leakage requirements such as various polluted and toxic liquids and gases.

[0019] The shielded three-phase AC asynchronous motor comprises: a base 1, a rotor shaft 2, a rotor 3, a stator 4, a stator coil 5, a rotor bearing A 6, an induction coil 7, a cover 8, a screw A 9, a magnetic block 10, a junction box 11, a positioning pin 12, a rotor bearing B 13, a screw B 33, and an O-type sealing ring 34. The stator 4 with the stator winding 5 is embedded in the base 1 of the valve electric drive device and fixed by the positioning pin 12; the rotor 3 is supported by the rotor bearing A 6 and the rotor bearing B 13 through the rotor shaft 2; a shielding sleeve 23 is provided inside the stator 4, the closed end of the shielding sleeve 23 is supported and limited by the closed end of the base 1, and the other end is fixed to the electric drive device base 1 by the screw B 33, and an O-type sealing ring 34 for radial sealing is provided between the shielding sleeve 23 and the electric drive device base 1; a reinforcing ring 15 is also provided outside the shielding sleeve 23 to improve the strength of the shielding sleeve at this location; and a junction box 11 of the motor stator winding 5 is provided outside the electric drive device base 1.

[0020] The small-tooth-difference planetary gear reducer comprises: a balancing block A14, a double gear bearing A16, a double gear 17, a double gear bearing B18, a balancing block B19, a fixed gear 20, a stop washer A21, a round nut A22, a shielding sleeve 23, a screw A24, a spring retaining ring 25 for a hole, a shaft sleeve 26, an output gear 27, a stop washer B28, a round nut B29, an output gear bearing B30, a sleeve 31, and an output gear bearing A32.

[0021] It should be noted that the stop washer B28 and the sleeve 26 are axially arranged between the bearing B30 and the round nut 29, the inner hole of the stop washer B28 is provided with an inner convex tooth embedded in the groove of the output gear 27, and the outer circle of the stop washer B28 is provided with an outer convex tooth embedded in the groove of the round nut 29 to prevent the round nut 29 from loosening, so that the stop washer B28, the sleeve 26, and the round nut B29 are in a locked state and rotate with the output gear 27. The hole spring collar 25 is sleeved on the fixed gear 20; the fixed gear 20 is fixedly connected to the shielding sleeve 23 by a screw B24.

[0022] Note: The stop washer and round nut are standard parts, and the groove on the output gear is a standard structure combined with the inner convex teeth of the stop washer.

[0023] The fixed gear 20 is fixedly connected to the shielding sleeve 23 by means of a screw A 24; the duplex gear 17 is mounted on the eccentric shaft of the rotor shaft 2 by means of a duplex gear bearing A 16 and a duplex gear bearing B 18, and a balancing block A 14 and a balancing block B 19 are respectively mounted on both sides of the duplex gear bearing A 16 and the duplex gear bearing B 18 on the eccentric shaft of the rotor shaft 2, and are axially fixed by a stop washer A 21 and a round nut A 22 to meet the dynamic balancing requirement; the output gear 27 is mounted on the inner side of the fixed gear 20 by means of an output gear bearing A 32 and an output gear bearing B 30, and is axially fixed by means of a sleeve 26, a sleeve 31, a stop washer B 28 and a round nut B 29.

[0024] The shielded valve electric drive device is driven by a shielded three-phase AC asynchronous motor. A shielding sleeve 23 is provided inside the stator 4. The closed end of the shielding sleeve 23 is supported and limited by one end of the base 1, and the other end is fixedly connected to the base 1 of the electric drive device by a screw C 33. An O-ring 34 for radial sealing is provided between the shielding sleeve 23 and the base 1 of the electric drive device. A reinforcing ring 15 is also provided outside the shielding sleeve 23 to support the thin-walled section of the shielding sleeve to improve the strength of the shielding sleeve at this location. The shielded valve electric drive device, the stator 4, shielding sleeve 23, rotor 3, rotor shaft 2 and small tooth difference planetary gear train reducer of the shielded three-phase AC asynchronous motor are cleverly integrated into a common machine base 1; The shielded valve electric drive device described above has a magnet block 10 at one end of the rotor shaft 2 of the shielded three-phase AC asynchronous motor, and a plurality of induction coils 7 are arranged on the circumference of the outer side of the closed end of the shield sleeve 23. The induction coils 7 are packaged at the upper end of the base 1 through a cover 8 and a screw A 9. When the rotor shaft 2 rotates, whenever the magnet block 10 is radially opposite to a certain induction coil 7, the induction coil 7 will generate a pulse current, and the detection system will record the pulse time to calculate the number of rotor revolutions. The shielded valve electric drive device, the double gear 13, the balancing block A 14 and the balancing block B 19 installed on the eccentric shaft of the rotor shaft 2, are axially fixed by a stop washer A 21 and a round nut A 22, and the dynamic balancing accuracy requirement can be met by adjusting the mass of the balancing block A 14 and the balancing block B 19; The shielded valve electric drive device has a balancing block A14 and a balancing block B19 installed on the eccentric shaft of the rotor shaft 2, and the upper surfaces thereof are provided with bidirectional inclined surfaces, namely, inclined surface 1 and inclined surface 2, which play the role of pushing the medium toward the upper side of the electric device and making the medium flow upward along the periphery of the rotor.

[0025] The shielded valve electric drive device is designed with an integrated rotor shaft and a reducer planetary gear shaft. The rotor shaft 2 and the planetary gear shaft that is not concentric with it are provided with a central through hole passing through the axis of the rotor shaft, so that under the joint action of the bidirectional inclined surfaces on the upper surfaces of the balancing block A14 and the balancing block B19, the medium forms a circulation around the rotor periphery (flowing upward) and the central through hole (flowing downward), so as to effectively cool and lubricate the bearings.

[0026] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. All technicians familiar with the technical field shall, within the technical scope disclosed in the present invention, make equivalent replacements or changes based on the technical scheme of the present invention and the concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A shielded valve electric drive device, characterized in that: The invention comprises a housing assembly, a rotor assembly, a reducer housing assembly and a reducer assembly; the rotor assembly is sleeved on the reducer housing assembly; the rotor assembly and the reducer assembly are arranged in series; a reducer housing assembly is arranged outside the reducer assembly; a housing assembly is arranged outside the reducer housing assembly; the reducer assembly comprises a balancing block A (14), a double gear bearing A (16), a double gear (17), a double gear bearing B (18) and a balancing block B (19); a balancing block A (14) is arranged at one end of the double gear (17); a balancing block B (19) is arranged at the other end of the double gear (17); a double gear bearing A (16) is arranged on one side of the inner cavity of the double gear (17); and a double gear bearing B (18) is arranged on the other side of the inner cavity of the double gear (17).

2. According to claim 1, a shielded valve electric drive device is characterized in that: The reducer housing assembly comprises a reinforcement ring (15), a shielding sleeve (23), a fixed gear (20), an output gear (27), an output gear bearing A (32), an output gear bearing B (30) and a round nut B (29); the output gear (27) is mounted on the inner side of the fixed gear (20) via the output gear bearing A (32) and the output gear bearing B (30); the sleeve (31) is arranged between the output gear bearing A (32) and the output gear bearing B (30); the round nut B (30) is threadedly connected to the output gear (27); the output gear bearing B (30) is limited by the round nut B (29); the outer side of the fixed gear (20) is fixedly connected to one end of the shielding sleeve (23); and the other end of the shielding sleeve (23) is provided with a reinforcement ring (15).

3. According to claim 2, a shielded valve electric drive device is characterized in that: It also includes a stop washer B (28), a shaft sleeve (26), a hole spring collar (25) and a screw B (24); the hole spring collar (25) is placed in the inner hole groove of the fixed gear; one side of the hole spring collar (25) contacts the side surface of the outer ring of the bearing B (30); the shaft sleeve (26) and the stop washer B (28) are arranged between the bearing B (30) and the round nut B (29); the shaft sleeve (26) is sleeved on the output gear (27); a stop washer B (28) is arranged on one side of the shaft sleeve; and the fixed gear (20) is fixedly connected to the shielding sleeve (23) by means of a screw B (24).

4. A shielded valve electric drive device according to claim 1 or 3, characterized in that: The rotor assembly comprises an induction coil (7), a magnetic block (10), a rotor bearing A (6), a rotor bearing B (13), a rotor (3), a stator (4), a stator winding (5), a rotor shaft (2) and a round nut A (22); the stator (4) is arranged on the stator winding (5); the rotor (3) is supported by the rotor bearing A (6) and the rotor bearing B (13) via the rotor shaft (2); a magnetic block (10) is arranged at one end of the rotor shaft (2); and the other end of the rotor shaft (2) is threadedly connected to the round nut A (22).

5. The shielded valve electric drive device according to claim 4, characterized in that: The invention also comprises a stop washer A (21), an induction coil (7) is arranged outside the closed end of the shielding sleeve (23); the magnetic block (10) is radially opposite to the induction coil (7); the double gear (17) is mounted on the eccentric shaft of the rotor shaft (2) through a double gear bearing A (16) and a double gear bearing B (18); a balancing block A (14) and a balancing block B (19) are respectively mounted on both sides of the double gear bearing A (16) and the double gear bearing B (18) on the eccentric shaft of the rotor shaft (2); the stop washer A (21) is arranged between the round nut A (22) and the balancing block B (19); the stop washer A (21) and the round nut A (22) axially fix the balancing block B (19).

6. The shielded valve electric drive device according to claim 4, characterized in that: The rotor shaft (2) and the reducer planetary wheel shaft are designed as an integrated whole; a central through hole passing through the axis of the rotor shaft is provided on the rotor shaft (2) and the integral non-concentric planetary wheel shaft.

7. The shielded valve electric drive device according to claim 1, characterized in that: The upper surfaces of the balancing block A (14) and the balancing block B (19) are both provided with bidirectional inclined surfaces.

8. A shielded valve electric drive device according to claim 1 or 5, characterized in that: The housing assembly comprises a base (1), screws A (9), a cover (8) and a junction box (11); the junction box (11) is arranged on one side of the base (1); and the cover (8) is fixed to one end of the base (1) by means of screws A (9).

9. The shielded valve electric drive device according to claim 8, characterized in that: It also includes a positioning pin (12), and the stator (4) with the stator winding (5) is embedded in the base (1) and fixedly connected by the positioning pin (12); a shielding sleeve (23) is provided on the inner side of the stator (4); the closed end of the shielding sleeve (23) is supported and restricted by one end of the base (1), and the other end of the shielding sleeve (23) is fixedly connected to the base (1) by a screw C (33); and a terminal box (11) of the stator winding (5) is provided on the outer side of the base (1).

10. The shielded valve electric drive device according to claim 9, characterized in that: It also comprises an O-type sealing ring (34), and a radial O-type sealing ring (34) is provided between the shielding sleeve (23) and the machine base (1).

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