CN211117788U - One-way valve device and valve head - Google Patents

Abstract

A non-return valve device for an air compressor is described, comprising a disk-shaped element (6) having a plurality of holes (7) for the air flow distributed along a portion (6a) having a circular crown extension, a sheet (10) superposed on the disk-shaped element (6) for closing the holes (7), a spring (11) which opposes the lifting of the sheet (10), the sheet (10) being apt to lift due to the pushing action exerted by the air flowing through the holes (7), the housing and cover dome (12).

Description

One-way valve device and valve head

Technical Field

The utility model relates to a check valve device.

More particularly, the present invention relates to a check valve device for sucking/discharging air in an air compressor.

Background

Valve devices are used in alternative compressors to allow air to enter during the inlet step to be compressed within the cylinder and compressed air to exit from the cylinder during the outlet step.

The valve devices commonly used in the past in the field of air compressor technology have a significant axial extension which has a negative effect on the overall dimensions of the compressor head and therefore on the compressor itself.

The most common valve device at present is the resilient membrane type, wherein under the action of air the membrane is sucked or compressively deformed to create an opening for air to enter or exit the compressor cylinder.

These types of valve devices, due to their size and the mechanical and/or intrinsic properties of the materials used, are not always completely effective in filling the cylinder and in generating noise.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a valve device which does not have the disadvantages of the prior art devices.

Another object of the present invention is to overcome the drawbacks of the prior art by means of a valve device that is effective and at the same time simple and inexpensive to produce.

In accordance with the above purpose, the technical features of the present invention can be easily inferred from the following.

According to one aspect of the present invention, there is provided a check valve device for an air compressor, comprising a disc-shaped element having a plurality of holes for the air flow distributed along a portion having a circular crown extension, a sheet superposed on the disc-shaped element for closing the holes, the sheet being apt to be lifted due to the thrust exerted by the air flowing through the holes, a spring opposing the lifting of the sheet, a dome housing the spring and the sheet and having a plurality of first openings for the distribution of the flowing air on the relative side surface.

According to another aspect of the present invention, there is provided a valve head for a compressor, the valve head comprising at least one valve device according to the above aspect.

Drawings

The advantages of the present invention will become more apparent in the detailed description which follows, with reference to the accompanying drawings, which provide, by way of example only, preferred embodiments of the invention, without limiting the scope of the inventive concept, and in which:

figure 1 is a schematic perspective view from above, with some parts in exploded view, of the head of a compressor equipped with a valve device made according to the present invention;

figure 2 shows the head of figure 1 from a different angle, with some parts in exploded view.

Detailed Description

With reference to the figures, reference numeral 1 indicates as a whole a valve-bearing head of an air compressor (not shown) of an alternative type.

By way of example only, the illustrated valve support head 1 is designed for a dual cylinder compressor to cover the top of the cylinder and regulate the flow of inlet/outlet air.

The valve support head 1 comprises a plurality of valve devices 2 made according to the present invention.

The head 1 also comprises a plurality of elastic lamina valves 3 of a substantially known type.

Advantageously, according to the preferred embodiment shown in the figures, the valve device 2 according to the present invention is dedicated to the flow of compressed air flowing out of the cylinder, while the elastic lamina valve 3 is used for the flow of air entering the cylinder.

As described more clearly below, the valve device 2 according to the invention is of the one-way type, i.e. the valve allows a flow according to a single flow direction.

The valve support head 1 comprises a plate 4 for housing the valve means 2 and the elastic lamina valve 3, the plate 4 being stably fixed, in use, on top of the compressor cylinder.

As best shown in fig. 2 and 1, the head 1 has a first flat surface 1a or lower surface, and a second surface 1b or upper surface opposite the flat surface 1a, the upper surface 1b being not flat but having a projection substantially defined by the valve device 2.

The flat surface 1a faces the inside of the cylinder in use.

As shown in fig. 1, the valve head 1 supports a plurality of valve devices 2, which valve devices 2 are inserted into respective threaded cylindrical housings 5, only one of which is shown in the drawing.

Referring again to fig. 1, the valve device 2 comprises a disc-shaped element 6, the disc-shaped element 6 having a plurality of holes 7 for distributing the flow of air along a respective portion 6a having a circular coronal extension.

The hole 7 made in the disc-shaped element 6 advantageously has an oval shape.

At the above-mentioned portion 6a with a circular coronal extension, the disc-shaped element 6 has, in order to define it, an inner edge 8 and an outer edge 9 concentric to each other.

The outer edges 8 and 9 are positioned elevated with respect to the remaining surface of the disc-shaped element 6.

The valve device 2 further comprises a sheet 10 superposed on the disc-shaped element 6 for blocking the above-mentioned hole 7.

The sheet 10 is therefore normally supported on the disc-shaped element 6.

More specifically, the sheet 10 comes into contact with the above-mentioned concentric inner and outer edges 8, 9 of the disc-shaped element 6.

The sheet 10 is also apt to rise by the pushing action exerted thereon by the air flowing through the holes 7 of the disc-shaped element 6.

The sheet 10 is therefore movable between a lowered configuration, in which the holes 7 are closed and air flow is prevented, resting on the disc-shaped element 6, and a raised configuration, in which air circulates through the holes 7, with respect to the disc-shaped element 6.

As is clear from fig. 1, the valve device 2 comprises a spring 11 which opposes the lifting of the sheet 10.

In other words, the lifting of the spring 11 with respect to the plate 10 and therefore the opening of the hole 7 exert an opposite action, so as to guarantee the closure without a predetermined flow of air and sufficiently to overcome the elastic force exerted by the spring 11.

The spring 11 is advantageously a helical spring.

Alternatively, according to an alternative embodiment not shown, the spring 11 is cup-shaped.

As shown in fig. 1, the valve device 2 comprises a housing and covering dome 12, designed to house inside it a spring 11 and a sheet 10.

The dome 12 has a first externally threaded cylindrical portion 13 designed to engage by screwing with the above-mentioned threaded cylindrical shell 5.

As shown in fig. 2, in which the dome 12 is shown in a different perspective from that of fig. 1, it has a cylindrical inner surface 12a corresponding to the first cylindrical threaded portion 13 described above.

The dome 12 has a second cylindrical portion 14, on the side surface of which a plurality of first openings 15 are made for the flow of air.

The first and second cylindrical portions 13, 14 of the dome 12 are coaxial and therefore have a common central axis a.

The shape of the first opening 15 is advantageously rectangular, and the long sides of the respective rectangles are positioned parallel to the above-mentioned central axis.

Interposed between the aforementioned first externally threaded cylindrical portion 13 and second cylindrical portion 14, the dome 12 comprises a gripping area 16 having a hexagonal shape, this gripping area 16 being designed to engage with a clamping tool such as a common wrench.

Referring to fig. 1, the dome 12 has a third top 17, the third top 17 being exposed from the second cylindrical portion 14 and having a second opening 18 for air flow, only one of which is visible in the drawing.

The third top portion 17 has a cover plate 19, the cover plate 19 being configured to guide air flowing through the second opening 18 transversely with respect to the central axis a.

As shown in the figures, the sheet 10 has the form of a circular crown and has a plurality of radially projecting portions 10.

The radial projections 10a are designed to keep the sheet 10 in a centred position with respect to the inner cylindrical surface 12a of the dome 12.

In other words, by means of the radial projections 10a, the sheet 10 remains substantially centred inside the cylindrical surface 12a even during the axial movement of the sheet 10 away from and towards the disc-shaped element 6.

Furthermore, between two adjacent radial projections 10a there is an empty space not occupied by the sheet 10, which helps to define an air passage escaping from the hole 7, directed to the first opening 15 and to the second opening 17.

As shown in fig. 2, each valve 3 has an elastic sheet 31 normally resting on a suitable flat support 32.

The elastic sheet 31 is closed in the form of a sandwich between the above-mentioned support 32 and the curved contact element 33.

The curved contact elements 33, the elastic sheet 31 and the above-mentioned flat support 32 are closed in a bag and inserted by means of screws 35 with interposed seals 34 in suitable housing cavities 36 made in the plate 4.

As shown in fig. 1, suitable openings 37 are made in the plate 4 for directing the air flow into the cavity 36.

When deformed by the action of air, each elastic sheet 31 bends and rests on the relatively curved element 33, determining the opening of the respective valve 3.

In use, the non-return valve device 2 according to the invention is designed to regulate the air flow according to a single direction of through-flow.

In more detail, assuming by way of example that, as mentioned above, the valve device 2 serves to regulate the flow of compressed air discharged from the cylinder of a compressor, not shown, it can be seen with reference to fig. 1 that the air under pressure pushes through the holes 7 of the disc-shaped element 6.

Since the sheet 10 rests on the inner edge 8 and the outer edge 9 of the disc-shaped element 6, the pressurized air will exert its pushing action on the sheet 10.

Against which the sheet material is held in contact with the above-mentioned edges 8, 9 of the disc-shaped element 6, against the elastic force exerted by the helical spring 11.

When the air pressure reaches a predetermined value, the air is able to overcome the opposing action of the helical spring 11, so that the sheet 10 can be lifted from the disc-shaped element 6.

The sheet 10 slides in the axial direction, i.e. inside the inner cylindrical surface 12a of the dome 12, according to the direction of the central axis a.

Due to the relative projection 10a, which remains substantially in contact with the above-mentioned inner cylindrical surface 12a, the sheet 10 remains in a relatively centred position even during disengagement from the disc-shaped element 6.

As the sheet 10 rises, the compressed air from the holes 7 flows freely towards the second cylindrical portion 14 and the third top 17, then escapes through the respective first 15 and second 18 openings.

Once the sheet 10 is lifted from the disc 6, air flows in the central hole of the sheet 10 and in the empty space between the above-mentioned adjacent radially protruding portions 10 a.

According to the utility model discloses a valve gear has realized predetermined purpose and has brought important advantage.

A first advantage of the connection to the valve device is due to the form of the circular crown of the sheet 10, which, together with the presence of the radial projection 10a, makes it possible to maximize the opening for the air flow without abandoning the correct and safe positioning of the sheet 10, even during the movement of the sheet 10 in order to disengage from the disc-shaped element 6.

This ensures a regular and constant operation of the valve device 2.

As described above, the compressed air flowing through the raised sheet 10 is directed toward the second opening 15 and the third opening 18 made on the dome 12.

The presence of a plurality of openings, in particular a large number of first openings 15, allows a correspondingly high separation of the entire opening for the air flow from the valve device 2.

Experimental tests have shown that this separation makes it possible to reduce significantly the noise generated by the outflowing air.

This constitutes a further advantage in connection with the valve device 2 according to the invention.

Experimental tests have in fact shown that the noise generated by the air flowing out of the valve device 2 according to the present invention is less than that generated by the elastic lamina valves 3 of known type.

Furthermore, as shown in the valve support head 1 shown in the accompanying drawings, the valve device 2 according to the invention is designed for supplying compressed air at the outlet, advantageously in combination with an elastic lamina valve 3 for the flow of air at the inlet.

It has been experimentally shown that such a combination advantageously enables an optimal and better management of the air flow and therefore a better filling and emptying of the cylinders, thus achieving a higher operating efficiency of the compressor.

Yet another advantage associated with the valve device 2 according to the present invention lies in the fact that the first opening 15 can be extended to enable the air to flow in the axial direction. This allows the opening for the flow of compressed air to be increased, regardless of the area occupied on the plate 4. This increase in the opening for the flow of compressed air and the above-mentioned separation produce benefits in both cooling the air and reducing the noise produced.

Claims (10)

1. A non-return valve device for an air compressor, characterised by comprising a disc-shaped element (6) having a plurality of holes (7) for the air flow distributed along a portion (6a) having a circular crown extension, a sheet (10) superposed on the disc-shaped element (6) for closing said holes (7), a spring (11) which opposes the lifting of the sheet (10), a housing and covering dome (12) which houses the spring (11) and the sheet (10) and has a plurality of first openings (15) for the distribution of the flowing air on the relative side surfaces, said sheet (10) being apt to be lifted as a result of the thrust exerted by the air flowing through the holes (7).

2. The non-return valve device according to claim 1, characterised in that the sheet (10) has the form of a circular crown and has a plurality of radial projections (10a), the radial projections (10a) being designed for centring the sheet (10) with respect to the inner cylindrical surface (12a) of the housing and covering dome (12).

3. The non-return valve device according to claim 2, characterised in that the plurality of radial projections (10a) are distributed at equal angular intervals along the periphery of the sheet (10).

4. A non-return valve device according to one of claims 1-3, characterised in that the dome (12) has a first externally threaded cylindrical portion (13) and a second cylindrical portion (14), on the side surface of which second cylindrical portion (14) a plurality of first openings (15) for the air flow are made.

5. The non-return valve device according to claim 4, characterized in that the dome (12) has a clamping area (16) with a hexagonal shape interposed between the first externally threaded cylindrical portion (13) and the second cylindrical portion (14), the clamping area (16) being designed to engage a clamping tool.

6. The non-return valve device according to claim 4, characterized in that the dome (12) has a third top (17) emerging from the second cylindrical portion (14) and having at least one second opening (18) for the air flow.

7. The non-return valve arrangement according to claim 6, characterized in that the third top portion (17) has a cover plate (19), the cover plate (19) being configured to direct air flow through the at least one second opening (18) transversely with respect to the central axis (A) of the second cylindrical portion (14).

8. A one-way valve device according to claim 6, characterized in that the disc-shaped element (6) has two concentric edges (8, 9), an inner edge and an outer edge, respectively, which are designed to be in contact with the sheet (10).

9. Valve head for a compressor, characterised in that it comprises at least one-way valve device (2) according to any one of the preceding claims.

10. The valve head according to claim 9, characterised in that it comprises at least one elastic lamina valve (3).

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