COUPLING ELECTRICAL INSULATING CONNECTION OF AN ELECTRIC DRIVE WITH AN ACTUATOR

Abstract

This utility model relates to an electrically insulating connection between an electric drive and an actuator and is used in electric drives of pipeline valves to ensure electrical isolation between the electric drive and the valve. The technical result of this utility model is to ensure reliable torque transmission from the electric drive to the actuator by increasing the rigidity of the coupling electrically insulating connection between the electric drive and the actuator.A coupling electrically insulating connection of an electric drive with an actuator comprises: a drive flange configured to be secured to the drive housing; an actuator flange configured to be secured to the actuator housing; a flanged dielectric disk rigidly installed between the flanges of the drive and the actuator; a drive half coupling configured to rotate jointly with the drive shaft; an actuator half coupling configured to rotate jointly with the actuator shaft; a dielectric coupling disk rigidly installed between the drive and actuator half couplings with the ability to rotate jointly with said half couplings. 8 cl., 3 fig.

Description

[0001] This utility model relates to an electrically insulating connection between an electric drive and an actuator and can be used in electric drives of pipeline valves to ensure electrical isolation between the electric drive and the pipeline valve. This electrical insulation prevents the passage of stray currents and the associated phenomenon of electrochemical corrosion.

[0002] Patent DE 102017212604 A1 (published January 24, 2019) discloses a drive coupling electrically insulating joint comprising a drive shaft with a drive coupling half mounted thereon and an output shaft with an output shaft coupling half mounted thereon. The coupling halves are secured by their flanges. A cylindrical insulating element is located within the output shaft coupling half. The drive shaft and output shaft are made of solid material.

[0003] The main disadvantages of the known coupling electrically insulating connection include: the lack of dielectric insulation between the drive flange and the output shaft flange; the impossibility of transmitting high torque due to the fact that the transmission of torque from the drive shaft to the output shaft is carried out indirectly through the flange connection of the coupling halves.

[0004] From the operating manual for the RemTEK electric drive ver.8.81 (S, M) OFT.18.2002.00.00.00 RE1, sheet 158, Fig. 2 (https: / / ремтек.рф / documentation / elektroprivod_remtek_8_81 / , freely available on the website remtek.rf, in the operating documentation section), a coupling electrical insulating connection of an electric drive with an actuator (gearbox) is known, selected as the closest analogue. The known connection shown in Fig. 1 of this application comprises: a drive flange 1, fixed to a housing 2 of the drive; a flange of an actuator 3, fixed to a housing 4 of the actuator; a flanged dielectric disk 5, fixed between the flanges of the drive and the actuator by means of fastening connections; half coupling 6 of the drive; half coupling 8 of the actuator, designed with the possibility of joint rotation with the shaft 9 of the actuator.

[0005] The drive and actuator coupling halves are installed coaxially, one inside the other, forming an annular gap between them. Electrical insulation between the drive and actuator coupling halves is provided by several dielectric bushings 10 installed between the coupling halves parallel to the central axis. The drive and actuator shafts are solid.

[0006] The well-known coupling-type electrically insulating joint improves the protection of the actuator and operating mechanisms from electrochemical corrosion. The electric drive with a coupling-type insulating joint is manufactured in compliance with explosion-proof requirements.

[0007] A disadvantage of the well-known coupling electrically insulating joint is that the dielectric bushings located in the annular gap do not provide sufficient rigidity to the coupling joint when transmitting torque from the electric drive to the actuator. This generally reduces the reliability of the electric drive, especially when transmitting high torque.

[0008] In addition, the known coupling electrical insulating connection does not allow for axial movement of the valve stem through the elements of the electric drive and actuator.

[0009] Technical task – eliminating the above-mentioned shortcomings of analogues.

[0010] The technical result of the utility model consists in ensuring reliable transmission of torque from the electric drive to the actuator by increasing the rigidity of the coupling electrical insulating connection of the electric drive with the actuator.

[0011] The technical problem is solved and the technical result is achieved in a coupling electrically insulating connection of an electric drive with an actuator, containing:

[0012] drive flange configured to be secured to the drive body;

[0013] an actuator flange configured to be secured to the actuator body;

[0014] flange dielectric disk, rigidly installed between the flanges of the drive and the actuator;

[0015] a drive half coupling designed to rotate jointly with the drive shaft;

[0016] a half coupling of the actuator, designed with the possibility of joint rotation with the shaft of the actuator;

[0017] a dielectric clutch disk rigidly installed between the drive and actuator coupling halves with the ability to rotate together with the said coupling halves.

[0018] In addition, the flange dielectric disk is fixed to the flanges of the drive and actuator through fastening connections.

[0019] In this case, the flange dielectric disk is fixed to the flanges of the drive and actuator by means of fastening connections, which are equipped with embedded washers.

[0020] In addition, the dielectric disc of the coupling is fixed to the coupling halves of the drive and actuator by means of fastening connections.

[0021] In addition, the drive half coupling is designed to rotate together with the drive shaft due to their fixation by means of a tenon joint.

[0022] In addition, the half coupling of the actuator is designed with the possibility of joint rotation with the shaft of the actuator due to their fixation by means of a tenon joint.

[0023] In addition, the drive shaft is installed in the drive housing on bearings, and the actuator shaft is installed in the actuator housing on bearings.

[0024] In addition, the drive half coupling, the dielectric clutch disk and the actuator half coupling are manufactured to form a common axial cavity.

[0025] In addition, the dielectric disc of the coupling can be connected to the drive half coupling and the actuator half coupling by keyed connections.

[0026] The essence of the utility model is explained by drawings.

[0027] Fig. 1 illustrates the prior art.

[0028] Fig. 2 shows a view of the coupling electrically insulating connection from the electric drive side.

[0029] Fig. 3 shows a cross-section of a coupling electrically insulating connection installed between the electric drive and the actuator (section A-A in Fig. 2).

[0030] The coupling electrically insulating connection in Fig. 3 comprises a drive flange 11 configured to be secured with a drive housing 12; an actuator flange 13 configured to be secured with a housing 14 of the actuator; a flange dielectric disk 15 rigidly mounted between the drive flange 11 and the actuator flange 13; a drive half coupling 17 configured to rotate jointly with a drive shaft 18; an actuator half coupling 19 configured to rotate jointly with an actuator shaft 20; a coupling dielectric disk 21 rigidly mounted between the drive half coupling 17 and the actuator half coupling 19 with the ability to rotate jointly with the said half couplings 17 and 19.

[0031] The flange dielectric disk 15 is fixed to the flange 11 of the drive and to the flange 13 of the actuator by means of fastening connections 16.

[0032] The dielectric disk 21 of the clutch is secured to the half-coupling 19 of the actuator and to the half-coupling 17 of the drive by means of fastening connections 22 (Fig. 2) located along the circumference of the dielectric disk 21 of the clutch. Fig. 3 shows the fastening connection 22 for securing the dielectric disk 21 of the clutch to the half-coupling 19 of the actuator. Similarly, the dielectric disk 21 of the clutch is secured to the half-coupling 17 of the drive.

[0033] To improve the fixation of the dielectric disk 21 relative to the half couplings 17 and 19, the dielectric disk 21 of the coupling can be connected to the half coupling 17 of the drive and the half coupling 19 of the actuator by keyed connections 23, which facilitates the reliable transmission of torque from the electric drive, especially under high loads and frequent starts / stops. Fig. 3 shows keyed connections 23 with prismatic end keys.

[0034] The electric drive with a coupling electrically insulating connection is manufactured in compliance with explosion protection requirements and can be installed in a hazardous area.

[0035] The drive half coupling 17, the dielectric disk 21 of the coupling and the half coupling 19 of the actuator are arranged axially relative to the central axis, i.e. sequentially along the axis, and can be made hollow or solid. In the specific embodiment in Fig. 3, the drive shaft 18, the drive half coupling 17, the dielectric disk 21 of the coupling, the half coupling 19 of the actuator and the shaft 20 of the actuator are made to form a common axial cavity, which allows the electric drive with the actuator to be installed directly on the valve stem or the tap shaft, and will ensure reliable transmission of torque to the pipeline valve from the electric drive, in which axial movement of the valve stem is required through the hollow shaft of the drive.

[0036] The half coupling 17 of the drive is configured to rotate jointly with the shaft 18 of the drive due to their mutual fixation by means of a tenon joint 24 (Fig. 2, 3). The half coupling 19 of the actuator is configured to rotate jointly with the shaft 20 of the actuator due to their mutual fixation by means of a tenon joint 25. Tenon joints 24 and 25 are made with straight tenons mated with mating straight grooves.

[0037] The fastening joints 16 of the flange dielectric disk 15 can be provided with embedded washers 26, which provide greater thread support and reliable fixation of the dielectric disk 15 between the flanges 11 and 13, which helps to increase the reliability of the electric drive, especially under high loads, frequent starts / stops, reversals and vibrations.

[0038] The drive flange 11 can be secured to the drive housing 12 by means of fastening connections 27. The drive shaft 18 is mounted in the drive housing 11 on bearings 29.

[0039] The flange 13 of the actuator can be secured to the housing 14 of the actuator by means of fastening connections 28. The shaft 20 of the actuator is mounted in the housing 14 of the actuator on bearings (not shown).

[0040] The combined rotation of drive shaft 18 and drive half coupling 17 is transmitted through dielectric clutch disk 21 to actuator half coupling 19 and actuator shaft 20. Due to the fact that dielectric clutch disk 21 is rigidly fixed between drive and actuator half couplings 17 and 19, the rigidity of the coupling electrically insulating connection is ensured, which improves the reliability of the electric drive, including when transmitting high torque, reversing, and under vibration.

[0041] In addition, the dielectric disc 21 of the coupling is made as a single piece, compared to several dielectric bushings in the closest analogue, which simplifies the design and helps to increase reliability.

Claims

1. A coupling electrically insulating connection of an electric drive with an actuator, comprising: a drive flange configured to be secured to the drive housing; an actuator flange configured to be secured to the actuator body; flange dielectric disk rigidly installed between the flanges of the drive and the actuator; a drive half coupling designed to rotate jointly with the drive shaft; a half coupling of the actuator, designed with the possibility of joint rotation with the shaft of the actuator; a dielectric clutch disk rigidly installed between the drive and actuator half couplings with the ability to rotate together with the said half couplings.

2. A coupling connection according to paragraph 1, characterized in that the flange dielectric disk is secured to the flanges of the drive and actuator by means of fastening connections.

3. A coupling connection according to paragraph 2, characterized in that the fastening connections of the flange dielectric disk are equipped with embedded washers.

4. A coupling connection according to paragraph 1, characterized in that the dielectric disk of the coupling is secured to the coupling halves of the drive and the actuator by means of fastening connections.

5. A coupling connection according to paragraph 1, characterized in that the drive half coupling is designed with the possibility of joint rotation with the drive shaft due to their fixation by means of a tenon connection.

6. A coupling connection according to paragraph 1, characterized in that the half coupling of the actuator is designed with the possibility of joint rotation with the shaft of the actuator due to their fixation by means of a tenon connection.

7. A coupling connection according to paragraph 1, characterized in that the drive shaft is installed in the drive housing on bearings, and the actuator shaft is installed in the actuator housing on bearings.

8. A coupling connection according to paragraph 1, characterized in that the drive half coupling, the dielectric disk of the coupling, and the half coupling of the actuator are made to form a common axial cavity.

9. A coupling connection according to paragraph 1, characterized in that the dielectric disk of the coupling can be connected to the drive half coupling and the actuator half coupling by keyed connections.

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