Electric drive of valves / dampers

Abstract

FIELD: electric drives.SUBSTANCE: invention relates to electric drives for air valves and dampers of air conditioning and ventilation systems. The electric drive of the valves / dampers includes a solenoid with a core and a pusher, fixed in the housing of the electric drive by means of a bracket made of thin stamped steel, which is attached to the gearbox plate by a screw connection at two points. The bracket wall has a groove for routing power wires. The bracket is additionally secured to the gearbox plate by spot welding, two points of which are made on the wider arm of the bracket before the groove and one point on the narrow arm of the bracket after the groove. This reinforcement eliminates the mobility of the bracket, maintains its resistance to external forces and eliminates the loss of strength of the bracket wall.EFFECT: increased efficiency of the pusher when fixing the pinion and reliable and stable operation of the electric drive as a whole for the entire period of operation.1 cl, 7 dwg

Description

[0001] The invention relates to means for controlling a technological process using an electric motor, namely to electric drives of air valves and dampers installed in air conditioning systems, supply, local and technological ventilation for industrial and civil purposes.

[0002] In ventilation systems, airflow is controlled by a valve or damper with an electric drive installed on them, changing the position of their movable control elements. The valve / damper's control elements are physically actuated by a solenoid, the reciprocating movement of the solenoid's core and plunger being generated by the electric drive's electrical component. The valve / damper's position is maintained by precisely moving the core and plunger of the solenoid to a specified distance and locking the pinion—the drive mechanism of the electric motor. However, in some cases, electric drive malfunctions are observed due to the precise positioning of the core and plunger of the solenoid being misaligned or jammed.

[0003] The following electric drives are known from the technical field: Electric Drive PEV-5-24, Electric Drive PEV-5-230, Electric Drive PEP-5-24, and others (see https: / / beepitron.com / category / 8 / ). The translational movement of the core with the pusher in these drives is controlled by a solenoid.

[0004] The present invention is intended to improve the reliability of an electric drive and increase the efficiency of its use when a solenoid is used in the design of the mechanism as a generator of the linear motion of the core with a pusher.

[0005] Solenoid 10 is secured in the electric drive housing by means of bracket 1, which in turn is secured to gearbox plate 5 by screw fasteners 6 (Fig. 1). The design of bracket 1 (Fig. 2) holding solenoid 10 is made of thin stamped steel. In addition, the bracket is designed so that the power supply wires are routed through groove 2 (Fig. 2) in the bracket wall and the wires are introduced into the electric drive unit, bypassing gearbox gears 14 (Fig. 6) and the working area of ​​​​the core 13 (Fig. 3) of the solenoid with its pusher 7 (Fig. 1), which fixes the position of the pinion 12 (Fig. 4.) Thus, the presence of groove 2 in bracket 1 eliminates contact of the power supply wires with the drive mechanisms. But, at the same time, groove 2 further reduces the strength of the already thin wall of the bracket.

[0006] In manufacturing practice for this type of drive, bracket 1 is typically secured to gearbox plate 5 by screw connection 6 (Fig. 1) at two points. Over time, the screw connection becomes loose, and the strength of the bracket decreases. This leads to the entire structure, due to bracket metal fatigue, experiencing some mobility, which can lead to poor adjustment and positioning accuracy of pusher 7 (Fig. 3), as well as to jamming. Furthermore, there is a risk that the pusher will lose its grip on pinion 12 of electric motor 11 (Fig. 4) during the process of stopping and securing the pinion after the electric drive has finished operating.

[0007] The proposed electric valve / shutter drive eliminates the described shortcomings, maintaining the rigidity of the bracket 1 mounting and eliminating the possibility of deviation in the positioning of the pusher or its jamming.

[0008] A device that increases the reliability of the electric valve / damper drive consists of three additional attachment points 9 (Fig. 5) of bracket 1 to the gearbox plate 5 using spot welding. Two attachment points are located on the wider arm of the bracket, before groove 2, and one point is located on the narrow arm of the bracket, after groove 2.

[0009] This reinforcement eliminates bracket mobility, maintains its resistance to external forces, and eliminates loss of strength in the bracket wall. At the same time, the efficiency of pusher 7 (Fig. 7) in securing the pinion is increased, ensuring reliable and consistent operation of the electric drive throughout its entire service life.

Claims

An electric actuator for valves / dampers, including a solenoid having a core with a pusher, secured in the housing of the electric actuator by means of a bracket made of thin stamped steel, which is attached to the gearbox plate by a screw connection at two points, characterized in that a groove is made in the wall of the bracket for laying power wires, and the bracket is additionally secured to the gearbox plate by spot welding, two points of which are made on the wider arm of the bracket before the groove and one point on the narrow arm of the bracket after the groove.

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