SU435793A1 - PNEUMATIC RELAY FOR MILKING PLANTS - Google Patents

Description

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Pneumatic relays are known that include a housing, a diaphragm, a valve, an annular control and a working chamber. Such relays do not provide suppression of the first signal coming from the sensor about satisfactory milk flow and do not switch to actuation upon all subsequent negative signals if the milk flow is not satisfactory.

In order to expand the functionality of the single-membrane vacuum relay, the annular chamber of the proposed relay has a second input, a lockable signal-controlled diaphragm.

The drawing schematically shows the proposed relay, side view in section.

The relay includes a housing with an annular control chamber 1, a working chamber 2 and a constant vacuum chamber 3. Membranes 4 and 5, valves b and 7, inlet 8, outlet 9 and control 10 fittings are installed in the housing. In addition, the relay is provided with an alternating vacuum chamber 11, self-locking, which has a second input and is submerged by a signal-controlled diaphragm 4 ...

Before the vacuum is applied, all chambers and channels of the relay act at atmospheric pressure. The membranes occupy a middle position, the valves close the channels of a constant vacuum, the chamber 11 communicates with the chamber 3.

When vacuum is applied to the fitting 8, the valve 7, under the action of the pressure difference, more tightly does not open the fitting and prevents air from being sucked out of chamber 3. When the first signal (vacuum) from the chamber 1 is suctioned, air is sucked and the membrane 5 bends up tight valve cover 6. At the same time, air is sucked out of chamber 11, and through it and out of chamber 3. When sufficient vacuum is created in this chamber, valve 7 opens, which provides additional air suction and the chamber 11 is closed. Valve 6 is held only due to the pressure difference, since a vacuum acts on both sides of the membrane 5. When the first signal is applied to the nipple 9, no output signals are given.

Thus, the first positive sensor signal provides only the preparation of the relay for issuing signals when negative signals are fed into its control chamber.

When this is then created in the control chamber 1 through the atmospheric pressure fitting 10, the membrane 5 bends downward, moves the valve 6 to the lower position, opening the vacuum and closing the air leaks. A fitting 9 is supplied with a vacuum. If vacuum is re-created in choke 10, membrane 5 is in the middle position and the flow of the satal output is stopped. Valve 7 overlaps the nipple in only when in pieces. Chambers 10 and 8 create atmospheric pressure, which corresponds to the switching off of the relay from work.

Due to the presence of a second inlet in the annular chamber, as well as the fact that the area of the membrane locking section of the entrance constitutes a smaller part of the total effective area of the membrane, the effect of self-locking is achieved.

The specified input is the appearance in the control signal chamber.

Subject invention

A pneumatic relay for milking installations, comprising a housing, a diaphragm, a valve, an annular control and a working chamber, characterized in that, in order to expand the functionality of the single-membrane vacuum relay, the annular chamber has a second input, a locking controlled from the signal.

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