SU141338A1 - Thermoregulator - Google Patents

Description

Thermostats for room air conditioners with bellows as a sensing element, filled with easily evaporated liquid, are known.

However, the known thermoregulators have insufficient sensitivity, which is their disadvantage.

The thermostat, made according to the invention, does not have this disadvantage. The essence of the invention is that the thermostat is made with a system of levers, two of which are interconnected by a spring and move under the influence of the bellows when the ambient temperature changes. On one of these levers a contact bridge is strengthened.

The drawing shows the kinematic scheme of the proposed thermostat.

The thermostat consists of two levers 1 and 2 connected by a spring 3, an intermediate lever 4, a movable plate 5 for fastening the bellows, an adjusting screw 6 with a spring, a snail mechanism 7, the force of the bellows is indicated by the arrow 8, and the screw 9 for adjusting the differential ( sensitivity) and the housing in which all elements of the thermostat are mounted.

The proposed thermostat design is based on a tilting mechanism consisting of levers / and 2 and spring 3, which is affected by the force of the bellows 8. The bellows is mounted on the board 5 acting on the intermediate lever 4 The thermostat operates as follows. As the ambient temperature inside the bellows rises, the working agent (easily evaporating liquid) is rapidly evaporated, due to which the internal pressure in the bellows rises sharply, and therefore the force 8 acting on the tilting mechanism through the lever 4 increases.

№ 141338

The lever 4 acts close to the support of the lever 2, therefore with a small movement of the end of the lever 4, the end of the lever 2 receives a large movement clockwise until the axis of the spring 3 of the tilting mechanism is aligned with the axis of the lever. At the moment of combining these axes, the unstable position of the lever / comes, at the end of which the contact bridge is fixed on a soft spring. Further movement of the lever 2 removes the lever / out of equilibrium and leads to a sharp closure of the contacts. Moreover, as the lever moves}, the force causing this movement increases all the time. Due to this, as well as the presence of the soft spring on the contact bridge, there is practically no vibration of the contacts during the closing and opening.

When the temperature drops to the set point, everything happens in the reverse order.

Differential (sensitivity) is adjusted by screw 9 - the smaller the distance between the contacts and the contact bridge, the smaller the differential and vice versa.

The adjusting screw with spring 6 makes it possible to move the operating temperature range upwards, i.e., when spring 6 is compressed, a force is created, partially neutralizing force 5 — if force 8 tends to move the board 5 and lever 4 apart, the spring force 6, on the contrary, is compressed.

Moving the mechanism of the cochlea 7 along the rectangular slot of the housing makes it possible to move the operating temperature range downwards, since moving the board 5 clockwise, there is some movement of the lever 2 clockwise, i.e. approaching the zero point (coinciding the axes of the spring 3 and the lever 2).

And the closer the lever 2 is to the zero point, the less its opposing momentum and the less force is needed to bring it to the neutral position. In the adjusted position, the snail mechanism is locked with a lock nut.

The proposed thermostat for room air conditioners is recommended for experimental testing.

Subject invention

Thermostat for room air conditioning with bellows. filled with easily evaporating liquid, characterized in that, in order to increase the dullness, it is made by a system of levers, two of which are connected to each other by a spring with a contact bridge fixed on one of them and not moving under the influence of the bellows when the ambient temperature changes.