SU1247686A1 - Method of adjusting temperature-sensitive relay elements with bimetal bang units - Google Patents

Abstract

The invention relates to the field of instrumentation and improves the accuracy of the adjustment. Place the sensor-relay in the working unit. The base with the nest 1 for the bimetallic element 2 is moved until the opening of the contacts 4, 6. In the process of heating the bimetallic element 2 with the help of the heater 12, it is displaced in steps that change the state to 4 and 10

Description

contacts 4, 6, in the direction that ensures the state of contacts at normal temperature, up to the moment. hopping the center of element 2 and closing the contacts. Move the base with the socket 1 to a certain distance, which provides the opening of the contacts 4, 6

The invention relates to instrumentation and can be used when adjusting the temperature sensor sensors.

The aim of the invention is to increase the adjustment.

FIG. 1 shows schematically the sensor-relays, the nodes necessary for carrying out operations according to the method, and the connection between them; in fig. 2 - adjustment diagram.

FIG. 1 designates: a base 1 with a slot for a bimetallic element, a bimetallic element 2, a brush 3, a movable contact 4, a housing 5, a fixed contact 6, a clamp 7, a screw pair 8, an electric motor 9, a pneumatic actuator 10, a switch 11, a heater 12, a power mechanism 13, control system 14, core 15.

The design of this sensor-relay is adjustable by moving the base 1 with the socket, which houses the bimetallic element 2, through the rod 3, mechanically acting on the moving contact 4, relative to the housing 5c with a fixed contact 6.

According to the proposed method, the adjustment of the temperature sensor sensors is carried out as follows.

B. The initial moment, after placing the adjustable sensor-relay in the working unit, the slider 3 does not touch the sliding contact 4, i.e. A gap is present and pins 4 and 6 are closed. The state of contacts 4 and 6 is opposite to the state of the contacts of the sensor-relay at normal temperatures Base 1 with a slot for bimetal

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and a guaranteed gap between them, eliminating the occurrence of an electric arc. Each sensor-relay is controlled by its own actual response from a point whose position unambiguously determines the start of an abrupt movement. 2 Il.

five

35 40

five

thirty

The plastic element moves upward, overcoming the pressure of the clamping 7 by means of a screw pair 8, driven by the electric motor 9, until the contacts 4 and 6 are open. At the moment of opening the contacts 4 and 6, the movement is stopped and a heater 12 is brought to the base 1 with a nest by means of a pneumatic actuator 10 controlled by a switch 11. FIG. 2, where o is the displacement (h) of the center of the bimetallic element relative to its edge, c is the displacement of the base 1 with the socket (the edge of the bimetallic element relative to the sensor-relay case 5), b is the displacement of the center of the bimetallic element 2 relative to the fixed contact 6 depending on temperature ( T) sensor-relay, this movement corresponds to the displacement of the center of the bimetallic element 2 from point C to point T) at normal temperature TC of the adjustable sensor-relay. The temperature of the heater 12 is significantly higher than the response temperature. This allows the formed heating of the sensor-relay. When heated, the center of the bimetallic element 2 moves downwards, in the direction of decreasing curvature (curve a, fig. 2). The contacts 4 and 6 of the sensor-relay are closed at what point. The closure of pins 4 and 6 is a permission to move the base

1 with a slot for a bimetallic element. Movement is made by dosing, by one degree (curve

with FIG. 2), i. — with a speed that is by an order exceeding the speed of movement of the center of the bimetallic element

2 under the influence of temperature. Since the movement of the base 1 with the socket is made upwards, this leads to the opening of the contacts 4 and 6 Under the action of temperature, the center of the bimetallic element 2 continues to move downwards; and the contacts close again, the electric motor 9 is turned on, the base 1 moves with the socket one step. The process automatically repeats, until the center of the bimetallic element 2 abruptly moves point A in FIG. 2. After the center of the bimetallic element 2 jumps downward, the contacts 4 and 6 of the sensor-relay are closed and the base 1 moves nest up one not enough to break them. If the contacts remain closed after moving the base I with the socket by one level, they additionally move in the same direction for a given distance from point E to point F (curve C, FIG. 2). Additional movement provides some overcompensation of the analogous movement of the bimetallic center. element 2 and at the time of all subsequent operations in the sensor-relay there will be a guaranteed gap between the movable 4 and the fixed 6 contacts, which eliminates the occurrence of an electric arc and increases the service life . The invariance of the states and contacts 4 and 6 at the beginning and end of the same stage of movement is a sufficient sign to recognize the characteristic point A of the characteristics of bimetallic element 2. (curve a, fig. 2).

Next, the heater 12 is retracted from the sensor-relay, an electrical signal is supplied to the power mechanism 13 from the control system 14, and using cores 15, the base 1 with the socket is attached to the housing 5 and rolled.

In the process of automatic compensation of analog movement

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the center of the bimetallic element when adjusting the temperature sensor sensors, the gap between the electrical contacts is always no more than a single movement, t, e. The position of the characteristic point A or G, from which the gap is formed, is determined with such accuracy. Being in the process of adjusting the actual position of point A, rather than B, greatly improves the reliability of the adjustment of the temperature sensor sensors. A single movement can be chosen as small as desired. 15

Thus, each sensor-relay is adjusted according to its own actual characteristic from a point, the position of which is uniquely determining the start of an abrupt movement.

Claims (1)

Invention Formula 25 A method of adjusting the temperature sensor relays with bimetallic clapping elements, including heating these elements to actuation, abruptly moving them around a relatively fixed contact, and forming, characterized in that, in order to improve the accuracy of adjustment, the clapping element before heating brought in contact with the moving contact mechanism, then moved until the contacts come to a state corresponding to the normal temperature, then slam the electric ment is heated and is moved in the heating process jumps measured noyuschimi state of contacts in a direction to contact state at normal temperature 5 BEFORE, at the next jump, the state of the contacts does not change, then the clapping element is moved in the same direction by a predetermined, providing a jump-like change in the state of the contacts when the clapping element is triggered, the distance. h (Mfij fig 2 Editor L. Veselovska Compiled by Y. Andrinov Tehred M. Khodanych 4П3 / 39 Circulation 778 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader G. Reshetnik Subscribe