CS263313B1 - Device for subpressure regulation,esp. for piping of milking machine - Google Patents

Abstract

The solution relates to the improvement of vacuum ratios and ensuring the vacuum stability u dairy milking machines. Vacuum control it is provided by the suction device atmospheric air into a vacuum conduit. Its essence is that that they are modified in the detachable body two working chambers interconnected and closed by membranes. One, membrane in conjunction with a spring having adjustable biasing controls the control valve. The second membrane controls the inlet valve atmospheric air based on pressure proportions affected by the control valve.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vacuum control devices, in particular for pipe milking machines.

Different types of vacuum pumps, especially rotary pumps, are used to create vacuum in the milking machine piping, which must have a certain power reserve to cover the vacuum fluctuations due to the operation of milking machines or milk transport. As the knowledge of the conditions in the milking process through milking machines develops, the requirements for the accuracy of the operating parameters, including the stability of the vacuum, are constantly increasing. Therefore, in milking machines, a vacuum control device is provided in the vacuum distribution system, which ensures the control of the vacuum constant by sucking air into the vacuum line near the rotary pump. To date, weight control devices are most commonly used in milking equipment, where the sealing plug of the inlet opening for admitting atmospheric air into the duct is controlled by a weight lever, and the suction a) and thus the vacuum is adjusted either by position of the weight on the lever or by additional loads. These weighing valves are very robust, difficult to adjust and thus do not sufficiently maintain the operating vacuum in the required accuracy and stability. A further disadvantage is that very often in these weighing valves, due to the suction of atmospheric air, the sealing plug with the weight is transferred to the vacuum line, which has a negative effect on the milking quality and the health status of the dairy cows. A suction device is also known in which the suction of atmospheric air into the duct takes place through an opening in the membrane that covers the inlet opening to the duct. Although it is a very simple and unpretentious design, it has not been substantially expanded because of the impossibility of adjustment and lack of precision in maintaining operational performance2.

263 313 him vacuum. Vacuum control devices are also known wherein one or more separate or interconnected vacuum and atmospheric air intake chambers and two membranes are each provided in the control valve, each separately operating a control chamber of the process chamber and a main valve allowing the atmosphere to be passed to the vacuum line. The amount of admission and hence the vacuum value is determined by the diaphragm and spring with adjustable bias, which control the control valve of the control device. Vacuum stabilization has been significantly improved, but these devices have disadvantages in terms of high complexity, manufacturing and maintenance and adjustment during operation.

It is an object of the present invention to provide a vacuum control device in pipeline milking machines which largely eliminates the above-mentioned drawbacks and provides long-term vacuum stabilization at low operating demands.

The advantages of the proposed solution according to the invention are mainly low production and operating costs, easy assembly, disassembly and replaceability of parts during maintenance and repairs and long-term high valve tightness. The device maintains long-term vacuum stability, easy adjustability by changing the spring preload and prevents the valve from vibrating during suction.

SUMMARY OF THE INVENTION The working chamber is separated from the atmospheric pressure chamber by a diaphragm with a seating orifice for a control valve connected to the diaphragm, which control valve is housed in the atmospheric pressure chamber and by a through opening communicates the working chamber with a working vacuum chamber connected to a vacuum line.

In the accompanying drawing, a schematic sectional view of an exemplary embodiment of the vacuum control device according to the invention is shown with open valves for suctioning atmospheric pressure into the vacuum line.

The vacuum control device is provided on a vacuum line X connected to a rotary vacuum pump (not shown) and controlling milking machines and other milking functions. It is provided with a lower part of the body 2 and an upper part of the body 3 therebetween

A spacer 6 is provided in the spacer 5 with a seat hole 7 for a control valve 8 in which there is a through hole 9. A diaphragm is inserted between the spacer 5 and the upper part of the body 3. 10 connected to a control valve 8 and forming an atmospheric pressure chamber 16 in the spacer 5 above the bulkhead 6 connected by an opening 17 in the spacer 5 with the atmosphere. Between the control valve 8 with the diaphragm 10 and the adjusting screw 12, a spring 11 is provided in the working vacuum chamber 14. The upper part of the body 3 is provided with a removable cover 13 of the adjusting screw 12. The working vacuum chamber 14 is connected to the vacuum line 1 via a tube 15. a working chamber 18 enclosed by a working diaphragm 19 is provided in the intermediate piece 5, to which is connected a valve 22 provided at the bottom of the body 2 between the inlet chamber 20 and the inlet opening 21 into the vacuum line L The individual chambers 14, 16, 18 and 20 modified so that the effective area of the working diaphragm 19 with the valve 20 is larger than the effective area of the diaphragm 10 with the control valve 8. To prevent the ingress of dirt into the inlet chamber 20, it is suitable to provide the device with a slot cover 23 connected to the union nut 4

The vacuum control device according to the invention operates as follows; in the closed position, the vacuum generated by the rotary vacuum pump (not shown) is located in the vacuum line J. # of the inlet opening 21, the tube 15, the working vacuum chamber 14, the overflow opening 9 and the working chamber 18 17 and the inlet chamber 20. The valve 22 closes the connection between the inlet chamber 20 and the inlet 21 and the control valve 8 closes the atmospheric pressure chamber 16. In the position described, the vacuum control device remains at the set diaphragm protection with the control valve 8 by spring 11 If the vacuum in the control chamber rises above the set and locked value, the control valve 8 is raised via the diaphragm 10. This allows the atmosphere to enter through the opening 17 and the atmospheric pressure chamber 16 through the seat opening 7 into the working chamber 18 and a through hole 9 into the co mory working

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14. By entering atmospheric pressure into the working chamber, the valve 22 is opened by deflecting the working diaphragm 19 4, thereby entering the atmosphere from the inlet chamber 20 through the inlet opening 21 into the vacuum line 1. At this stage, the vacuum control device assumes the position shown in the enclosed drawing. . The ingress of the atmosphere into the vacuum line 1 is continued until the vacuum is reduced in the working vacuum chamber 14 to the set value. Therefore, by the action of the spring 11 and the diaphragm 10, the control valve 8 closes the seat bore 7 and hence the atmospheric pressure chamber 16. By closing the seat bore 7, atmospheric pressure in the working chamber 18 is canceled by the overpressure 9 and the working diaphragm 19 closes the existing inlet connection. This eliminates the possibility of the atmosphere being sucked into the vacuum line 1, and the described opening and closing method is repeated each time the vacuum values change from the set and secured values. This vacuum value can be varied by biasing the spring 11 via the adjusting screw 12 after removing the cover 13.

Claims (1)

SUBJECT OF THE INVENTION Vacuum control device, in particular for dairy milking machines, by means of a valve closing the inlet to the vacuum duct and connected to a working diaphragm separating the inlet chamber from the working chamber and in which body another membrane separating the atmospheric pressure chamber from the operating vacuum chamber and operating a spring loaded control valve, characterized in that the working chamber (18) is separated from the atmospheric pressure chamber (16) by a septum (6) with a seat opening (7) for the control valve (8) connected to the diaphragm (10), the valve (8) is housed in the atmospheric pressure chamber (16) and connects the working chamber (18) to the working vacuum chamber (14) connected to the vacuum line (1) via a through opening (9).