SU1737426A1 - Automatic heat-sensitive valve - Google Patents

Abstract

The invention relates to mechanical means of controlling gas flow, which are controlled by a thermal actuator, and can be used in various sectors of the national economy. The purpose of the invention is to improve the accuracy of the automatic thermal valve by compensating for the temperature change of the thermal sensitivity of the thermal actuator. The thermal valve contains a butterfly valve, pivotally connected through a lever to a pull that is connected to the main thermal actuator. The lever is connected to the thrust through a slide located on the lever, the position of which is determined by a corrective thermal actuator of two coaxial springs, one of which is made of a material with a reversible shape memory, and the other creates a preload. 1 hp f-ly, 3 ill. Yo

Description

The invention relates to a mechanical means of controlling the flow of gas, which is controlled by a thermal actuator, and can be used in various branches of the national economy.

Known for the regulation of gi, the control of which is carried out thermally, made in the form of a spiral helix of bimetal.

Closest to the present invention, there is an automatic thermal valve with a thermal actuator in the form of a coil spring, which contains a butterfly valve, which is pivotally connected through a lever with a pull that is connected to the thermal actuator.

However, the known devices are characterized by insufficient accuracy due to a change in the sensitivity of the drive from temperature.

The purpose of the invention is to improve the accuracy of the automatic valve by compensating for the temperature change of the thermal sensitivity of the thermal actuator.

The goal is achieved by the fact that the angular or linear movement of the thermal valve is connected by a lever connected with it, which can be used to move the slide that is pivotally connected to the moving end of the thermal actuator.

At the same time, the thermal valve thermosensitivity can be adjusted manually by

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2

Oh oh

fixing the slider at an arbitrary point of the lever or automatically if the slider moves along the lever with a corrective thermal actuator.

Figures 1 and 2 show a thermal valve, respectively, in closed and open positions; in FIG. 3, node 1 in FIG. 3 (corrective thermal actuator).

In Fig. 1, a louver plate 1 is fixed on axis 3, on which in turn sleeve 2 is fixed. On the latter lever 4 is fixed, along which slider 5 moves and fixed at an arbitrary point 5. lever 6 is fixed on axis 3 that is hinged to the connecting rod 7, to which the arms b .6 .... are also pivotally connected. They are rigidly connected to the axis of rotation of the louver plates 11, 111 .... The slider 5 is pivotally connected to the thrust 8, which in turn is pivotally connected to the movable end of the main thermal actuator 9.

In Fig. 1, a louver flap closes a rectangular opening, the cross section of the frame of which is depicted by parts 10 and 11. Fig. 2, louver flap is depicted in the open state.

Fig. 3 shows the detail of the node i {Fig. 1} for the case of the auto-adjustable thermal sensitivity of the louver valve. The slider 5. pivotally connected to the thrust 8, moves along the lever 4 under the action of a spring-correcting thermal actuator 12 made of an alloy with a reversible shape memory, reducing its length in the free state with increasing temperature. The corrective thermal actuator 12 receives a preload from the stretched steel spring 13. The interaction of the corrective thermal actuator 12 and the steel spring 13 provides movement of the slide 5 along the lever 4 when the temperature of the corrective thermal actuator 12 changes.

The device works as follows.

The main thermal actuator 9 in the free state unwinds when heated. In Fig. 1, the position of the main thermal actuator 9 and the louver plates 1.11, V1 ... corresponds to the temperature of the lower limit of the temperature range for adjusting the position of the louver plates. When the temperature rises, the moving end of the main thermal actuator moves the pull 8, which rotates the lever 4 through a fixed slider 5, which is accompanied by the rotation of the louver plates 1.

In figure 2, the position of the main thermal actuator 9 and louver plates 1, 1, 1 ...

corresponds to the temperature of the upper limit of the temperature control range.

If it is necessary to increase the accuracy of controlling the gas flow rate while simultaneously reducing the temperature range of the medium over which the valve is controlled, the slider 5 is fixed at the point located on the lever 4 closer to its axis of rotation.

If it is necessary to increase the temperature range of the medium, the temperature of which controls the valve while at the same time reducing the accuracy of regulating the gas flow, then the slider 5

is fixed at the point located on the lever 4 further from its rotation.

If through the opening, the working section of which regulates the valve, the gas flow is carried out under the action of natural convection, then the main and correcting thermal temperatures are carried out of the opening, so that it is in thermodynamic equilibrium with the medium, the temperature of which controls the valve (Fig. 1) ).

If the lever 4 is equipped with a corrective thermal actuator (Fig. 3), then the slider moves under the action of the corrective thermal actuator 12 and the steel spring 13.

The temperature of the corrective thermal actuator 12 and the main thermal actuator 9 is equal to the temperature of the gas, the flow rate of which is regulated, therefore the thermostat of the louver valve is automatically adjusted.

Claims (2)

Claim 1. Automatic thermal valve containing a butterfly valve, pivotally connected through a lever with a pull that associated with the main thermal actuator, characterized in that, in order to increase the accuracy of the automatic valve by compensating for the temperature change of the thermal sensitivity of the main thermal actuator, it contains a corrective thermal actuator, the swivel link of the lever with the thrust being made through a slide located on the lever corrective thermal drive. 2. Thermal valve according to claim 1, from l to tea so that the corrective thermal actuator is made in the form of a spring made of a material with a reversible shape memory, and the spring of the preload is coaxial and counter to this spring, the moving ends of both springs are connected to slider, and fixed ends - with a lever. 1 J FIG. 2 12 Figz