ITTV980152A1 - SINGLE CYLINDER PUMP, PARTICULARLY FOR PUMPING MALTA AND SIMILAR MATERIALS. - Google Patents

Description

"SINGLE CYLINDER PUMP, PARTICULARLY FOR PUMPING MORTAR AND SIMILAR MATERIALS"

DESCRIPTION

The present application relates to a single-cylinder pump, of the type usable for machines for pumping mortar and similar materials.

Nowadays machines are used in the building sector whose function is to pump mortars and similar materials, usually using a single-cylinder pump with single-acting piston.

These known types of pumps essentially have the drawback of presenting a considerable discontinuity in the flow of mortar sent to suitable pipes for casting the same, for example in correspondence with a wall to be plastered; as a partial solution to this drawback, it is known to apply compensators, known as air pockets, or ducts for the mortar of the elastic type to these known pumps.

Even these two solutions are not optimal, since the compensators are nowadays out of EEC regulations, while the elastic ducts have the considerable drawback of not being able to overcome a certain pressure, thus reducing their range of use.

The main task of what forms the subject of the present application is therefore to solve the technical problems highlighted, eliminating the drawbacks of the cited known art and therefore devising a pump usable in machines for pumping mortar and similar materials which allows to deliver a flow constant of material.

Within the scope of the above aim, another important object is to provide a pump which does not have to use air pockets or elastic ducts.

Another important object is to provide a pump which associates with the preceding characteristics that of being able to obtain a flow of material which, for the same power used with respect to known-type pumps, has higher pressures.

Not least object is to provide a pump which is structurally, the same having low manufacturing costs.

The above mentioned aim and objects, as well as others which will appear more clearly later, are achieved by a single-cylinder pump, particularly for pumping mortar and similar materials from a hopper or tank which is characterized in that it comprises a lower suction chamber , having a first gravitational valve, communicating with the delivery of a double-acting piston and a second gravitational valve, for the inflow of the mortar to an upper delivery chamber, said piston with double compensating effect presenting a transit chamber communicating with a outlet and with a connection duct with said upper delivery chamber. Further characteristics and advantages will become clearer from the detailed description of a particular, but not exclusive, embodiment, illustrated for indicative and non-limiting purposes in the attached drawing tables in

Which :

fig. 1 is a side view of the pump;

fig. 2 shows the pump in a section operated according to an average plane thereto;

fig. 3 shows the pump in a section made in correspondence with the connection pipe of the transit chamber with the upper delivery chamber.

With reference to the aforementioned figures, the number 1 indicates a single-cylinder pump which is particularly used in machines for pumping mortar and similar materials.

This pump consists of a body 2, which internally has a lower suction chamber 3 and which is connected at the bottom, by means of suitable quick couplings, in correspondence with a first duct 4 connected to a hopper or to a tank for conveying the mortar. and similar materials.

The upper body 2 is connected, by means of predisposed quick couplings, to a second body 5 defining inside it an upper delivery chamber 6 with which a suitable pressure gauge 7 communicates.

The lower suction chamber 3 has, in correspondence with the connection to the first conduit 4, a first gravitational valve 8 constituted by a sphere adapted to temporarily occlude said first conduit 4 itself.

The lower suction chamber 3 also communicates, in correspondence with the interconnection to the second body 5, with a second gravitational valve 9 still constituted by a sphere adapted to temporarily occlude the access between the lower suction chamber 3 and the upper delivery chamber. 6.

Such first and second gravitational valves are such that they act alternately.

The lower suction chamber 3 also communicates with a predisposed second duct 10, protruding radially from the first body 2, inside which there is a jacket 11 within which a piston, indicated with the number 12, with double compensating effect, slides.

The latter therefore consists of a stem 13 which has a head 14 at the terminal end to which a first annular gasket 15 is associated.

A seat 16 is therefore defined coaxially to the stem 13, posterior to the first annular gasket 15, communicating with a transit chamber 17, which in turn communicates with an outlet 18 and with a duct 19 connecting with the upper delivery chamber 6 .

The transit chamber 17 also communicates with a safety and material recycling by-pass 20.

The operation of the pump is as follows: we initially consider the suction from the hopper or tank of the mortar or similar material.

This phase takes place in the return movement of the piston 12 inside the jacket 11, this causing the raising of the first gravitational valve 8 and the simultaneous closing of the second gravitational valve 9.

Through the first duct 4 the mortar or similar material then fills the lower suction chamber 3 and the area of the liner 11 in front of the piston head 14.

Subsequently, in the movement of the piston, the material is pushed towards the outlet 18 of the pump with simultaneous filling of the seat 16 and of the transit chamber 17.

In fact, when the piston moves in the direction of the lower suction chamber 3 this causes the closing of the lower gravitational valve 8 and the opening of the upper gravitational valve 9 with the consequent filling of the upper delivery chamber 6.

The material flows from the latter into the duct 19 and therefore in correspondence with the transit chamber 17, further filling the part of the seat 16 coaxial with the piston rod.

The transit chamber 17 is connected to the outlet 18 in correspondence with which predisposed connections for pipes suitable for spraying the mortar or similar materials where required can be associated.

After filling the lower suction chamber 3, the upper delivery chamber 6 and the transit chamber 17 in the initial phase, the actual pumping of the material begins, which takes place in both directions of movement of the piston, which allows to define the rediscovered as a single-cylinder double-acting compensator pump.

This implies that in the forward thrust of the piston head (towards the lower suction chamber) 50% of the material leaves the transit chamber 17 and flows to the outlet, while the remaining 50% fills the seat 16, contributing to push the piston head forward, halving the effort to be applied.

In the opposite movement of the piston, the material contained in the seat 16 is forced into the transit chamber 17, sucking further material from the lower suction chamber.

Coaxially to the stem 13 there is a bush 21 suitable for protecting the stem itself.

A second annular gasket 22 cooperates with the bush 21, adjacent to the outlet 18 and the by-pass 20, whose function is to prevent the material from escaping and to compensate for any play of the bush 21.

A constant flow cycle is therefore obtained which is the characteristic of the double compensating effect piston.

It has thus been found that the invention has achieved the intended aim and objects, a pump having been devised which allows to have a sufficiently constant flow of material thus excluding the need for known compensators or rubber elements with the possibility of deformation; furthermore, this pump causes the mortar to come out of it at the same power with a pressure in bars which is approximately double that of known pumps using a single-acting piston; consequently, machines for pumping mortars and similar materials that use this pump will see their range of action increased, both in distance and in height.

It has also been verified that despite the doubling of pressure, compared to the machines that adopt a known type pump with single-acting piston, the possibility of a connection to the 220 volts single-phase electrical network for domestic use is maintained, obtaining equally a distance and a useful height for high plastering.

The invention is naturally susceptible of numerous modifications and variations, all of which are within the scope of the same inventive concept.

Naturally, the materials as well as the dimensions that constitute the individual components of the pump may also be the most pertinent according to specific requirements.

Claims (6)

R IV E N D I C A C IO N I 1) Single-cylinder pump, particularly for pumping mortar and similar materials from hopper or tank which is characterized by the fact that it comprises a lower suction chamber, having a first gravitational valve, communicating with the delivery of a double-acting piston and a second gravitational valve, for the inflow of the mortar to an upper delivery chamber, said piston with double compensating effect having a transit chamber communicating with an outlet and with a connection duct with said upper delivery chamber. 2) Pump as in claim 1 which is characterized by the fact that said body internally has a lower suction chamber and is connected below. by means of predisposed quick couplings, in correspondence with a first duct connected to a hopper or to a tank the conveyance of the mortar and similar materials. 3) Pump according to claims 1 and 2 which is characterized by the fact that said body is connected at the top, by means of predisposed quick couplings, to a second body defining inside it an upper delivery chamber with which a predisposed pressure gauge communicates. 4) Pump according to claims 1 and 3 which is characterized by the fact that said lower suction chamber has, in correspondence with the connection to said first conduit, a first gravitational valve constituted by a sphere adapted to temporarily occlude said first conduit. 5) Pump as in claims 1 and 4 which is characterized by the fact that said lower suction chamber also communicates, at the interconnection to said second body, with a second gravitational valve consisting of a sphere suitable for temporarily occluding access between said lower suction chamber and upper delivery chamber. 6) Pump according to claims 1 and 5 which is characterized by the fact that said first and second gravitational valves act alternately. 7} Pump according to claims 1 and 5 which is characterized by the fact that said lower suction chamber communicates with a predisposed second duct, protruding radially from said first body, inside which there is a jacket inside which a double piston slides effect consisting of a stem having a head at the terminal end to which a first annular gasket is associated. 8) Pump according to claims 1 and 7 which is characterized by the fact that a seat is defined coaxially to said stem, behind said first annular gasket, communicating with a transit chamber which in turn communicates with an outlet and with a connection duct with said upper delivery chamber. 9) Pump according to claims 1 and 8 which is characterized by the fact that said transit chamber communicates with a safety and material recycling by-pass. 10) Pump as in claim 1 which is characterized by the fact that said piston has a double compensating effect and communicates at the rear with a transit chamber communicating with an outlet and with a connection duct with said upper delivery chamber. 11) Pump according to one or more of the preceding claims which is characterized by the fact that coaxially to said stem there is a bush able to protect said stem itself, with said bush cooperating a second annular gasket, adjacent to said outlet and by pass, the whose function is to prevent the material from escaping and to compensate for any play of said bush. 12) Pump according to one or more of the preceding claims which is characterized by what is described and illustrated in the attached drawings.