SE9201981A0 - The pumping device - Google Patents

Abstract

P. ans. 9201981-9 Summary The invention relates to a pumping device for water shoes with two pump chambers and associated control chambers. The invention solves the problem of creating a substantially pus-free liquid flood in the common outlet line. This has been achieved according to the invention in that the suction and pressure strokes in each pump chamber (1, 2) take place independently of the corresponding process in the other pump chamber (2, 1) and thus effective compression pressure always lines in at least one of the operating chambers, whereby a driving pressure continuously upright in the outlet The lead ().

Description

Fig. 1. t. Patent yard 192 -CC- 26 PUMPANORE) NING The invention relates to a pumping device for water shoes with at least a pair of cooperating pump chambers, which under the influence of a pneumatic control system are filled and emptied alternately with the pumped water and which each have an inlet supply line and an outgoing branch line connected via a non-return valve to a tank or equivalent. contains a non-return valve and is connected to a common outlet line, whereby for filling and emptying pneumatic control chambers belonging to the pump chambers, a mantiver valve is arranged.

Such pumping devices are used, pumping of water shoes in = several technical areas. Examples of the areas of application of such pumps include the transport of water shoes in the food industry as well as the technical and pharmaceutical industries. In these contexts, diaphragm pumps, which have several operational advantages, are usually used, primarily in the event of a closed pocket on one side, the pump pressure remains but on the other side the drive device stands still, so that no energy is supplied to the liquid. Even when it comes to mechanical impact, diaphragm pumps are gentle on the pumped water shoes. Furthermore, diaphragm pumps are relatively less prone to the presence of larger particles, fibers and the like in the liquid. However, diaphragm pumps on the other hand have certain functional limitations or disadvantages in the first place that the dot output surface is not but constant in time but strongly pulsating. These pulsations produce vibrations, which give mechanical pans on the equipment and disturbing sounds. Furthermore, the pulsating nature of the surface entails similarities in river and pressure feeds. Finally, the pressure and flocculation of the outgoing liquid stream depend on the installation level and the liquid level in the tank from which the liquid is led to the pump, ie on the static pressure in the line from the tank.

The object of the invention is to provide a pumping device in which the above-mentioned disadvantages and limitations AI * are eliminated or at least greatly reduced. This has been achieved by continuing the pump device with means which initiate the pressure stroke in one pump chamber before the pressure stroke in the other Ink. t. Patvrtverket 1g92 -Os- 26 the pump chamber is closed. For this to be possible, the two pump chambers must work independently of each other. The invention is based on the insight that such an individual mode of operation with the advantages obtained can not be achieved with known pumping devices, where the chambers are functionally dependent on each other, for example with diaphragm pumps by a mechanical interconnection of the two diaphragms both with and with the control valve. According to the invention, there is no such mechanical connection between the pump chamber and the control valve.

Two embodiments of the invention are described below with reference to the drawing, which schematically illustrates each of them.

Fig. 1 shows a pump housing with two single-acting diaphragm pumps, which are not mechanically connected.

Fig. 2 shows a pump device with two single-acting pumps, which do not have a diaphragm or other mechanical partition between the operating and the pumped fluid.

The pump device according to Fig. 1 has two pump chambers 1 and 2, each with membranes 3 and 4, respectively. The pumped liquid 8 enters through a supply line 5 and passes from there via non-return valves 6, 7 into the space of the respective pump chambers under the diaphragm. The water tank 8 leaves the device through its branch line 9 and 10, respectively, connected to a common outlet line 11.

Both diaphragm pumps are operated by a pneumatic system. This includes a pressure source 12 connected to the inlet port of a tyrvag's two-way valve 13, the movable part of which, as a slide or other type of eagle, is operated by a unit 14, which can be driven pneumatically or electrically and thereby controlled by a timing circuit or the pump chambers 1, 2. Above each liquid chamber there is a pneumatic compression chamber 1a, 2a, which via a line 1b, 2b is connected to the valve 13. A suction unit is denoted by 15, which takes care of what is connected at a given moment. Ink. t. Patengrket 1992 -06- 2 6 The suction movement of the diaphragm and is driven by a means 16.1 In cases where inlet pressure in the supply line 5 is obtained in another way, for example with a supply pump or in the form of a static overpressure, the means 15 and 16 can be dispensed with.

The function of the pump device described above is as follows. Fig. 1 illustrates a stage of the functional process, in which compressed air is lifted into the left operating chamber 1a from the pressure source 12 and through the valve 13. As a result, a compression pressure has been built up in this chamber, which has pressed the diaphragm 3 downwards, so that liquid is forced out through the manifold 9 with the non-return valve 17. While a part of the diaphragm 3 of the diaphragm 3 is facing downwards, the valve 13 is shifted to its second Ikge, so that a compression bore builds up in the chamber 2 a. During the shifting phase the air volume trapped in the chamber 1a and still under overpressure will continue to push the diaphragm 3 down. This takes place until the compression pressure above the diaphragm 4 has become stormy above the diaphragm 3, where there is a successive pressure reduction due to the volume increase, partly at a somewhat later moment, by this mantle chamber being connected to the outlet port of the valve 13. Thanks to this During the operation, an overlap is obtained between the time intervals during which effective compression pressures line the chambers, so that a driving pressure is continuously maintained in the outlet line 11. As a result, the flow in this becomes substantially constant and pulsation-free. There is a non-return valve 18 in the outgoing branch line 10 of the chamber 2.

In Fig. 2, the components of the device which have a direct equivalent in Fig. 1 have been assigned the same male reference numerals as there. The difference with respect to Fig. 1 as a material partitions (membrane or pistons) between the pumping and the pumped fluid is missing. In the stable there are upper and lower level sensors 19, 20, which prevent liquid from being sucked into the operating system or that a pump chamber can be kept tamed on liquid. The level sensors can be connected to a logic circuit to perform the Onskvarda function. In addition, for optimal operating conditions, the relationship between the inlet and outlet river is such that the pressurized pump chamber is never emptied. Furthermore, if the membrane or equivalent lacks liquid, it is not sucked into the control valve, which is prevented with the lower t. Patentveriet 1992 -06- 26 level sensors 19 or with other suitable means.

The bends used on the various components of the device are intended to be interpreted functionally, not verbally. As an example, which is often referred to as a non-return valve, is meant any suitable valve which can perform the function of a conventional non-return valve, for example an electric or mechanically controlled valve.

Claims (1)

P. ans 9201981-9 REQUIREMENTS Pump device for water tanks with at least a pair of diaphragm pumps with cooperating pump chambers (1, 2), which under the influence of a pneumatic control system are filled and emptied alternately with the pumped water and each has one via a non-return valve (6, 7) to a tank or correspondingly connected incoming supply line (5) and an outgoing branch line (9,10), which contains a non-return valve (17,18) and is connected to a common outlet line (11), filling and emptying to the pump chambers ( 1,2) Horn pneumatic control chambers (1a, 1b) are provided with a pneumatic control valve (13), characterized in that it lacks mechanical connections between the pump chambers (1,2) and the control valve (13), which controls suction and pressure strokes in each the pump chambers (1 and 2, respectively) said that they occur independently of the suction and pressure strokes in the other pump chamber (2 or 1) and that effective compression pressure always races in at least one of the control chambers, whereby a driving pressure continuously increases The outlet line (11), and the control valve (13) are arranged to change so rapidly from the connection layer of one control chamber (1a) to the connection layer of the other control chamber (2a), that the compression pressure in the first-mentioned control chamber (1a) increases versa Ink. t. Patentverket 1992 -OS- 26 / vw \ == I 13 • lb 2 1. 17 9 -cc-18/0 ii. ••••• 1992 -06- 26 \ b \ == / 3 - / - .242 / 61 1. • ■ ••••• ■ 1 ° '