RU2472967C2 - Membrane suction device assembly - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: assembly of membrane suction device includes casing (1) of membrane of rigid form, cover (3) of membrane of rigid form made as integral part and containing pump chamber (31) that has bottom area and side wall (36) enclosing bottom area and widening towards outside, and also it contains pump membrane (2) made as integral part that has membrane plate (20), flexible membrane piston (21), at least, one inlet valve (23) and, at least, one outlet valve (24). Membrane plate (20) is located between membrane casing (1) and membrane cover (3), and membrane casing (1), pump membrane (2) and membrane cover (3) are interconnected in specified position in relation to each other via connecting elements (15, 15', 15"). Membrane piston (21) goes through membrane casing (1) as well as covers pump chamber (31) of membrane cover (3). According to invention there provided is more than three connecting elements (15, 15', 15"), note that they form material interlocking and/or body closure.

EFFECT: increase of operation stability.

22 cl, 7 dwg

Description

Technical field

The present invention relates to a membrane aspirator assembly according to the preamble of claim 1.

State of the art

The membrane suction unit as part of a breast pump is known, for example, from US 4964851. The breast pump contains an electric motor driven by a connecting rod motor and a pump diaphragm connected to it. The pump diaphragm is held in the diaphragm casing and together with the diaphragm cap forms a pump chamber. In commercially available pumps, the diaphragm casing, the pump diaphragm and the diaphragm cap are interconnected by means of a press connection, for which three pins of the diaphragm casing are held in a friction lock in the corresponding openings of the diaphragm cap.

In addition, US 7070400 discloses a similar membrane aspirator assembly as part of a suction pump, in which case the membrane comprises a membrane piston with recesses on the back side. The membrane cover limits the space with a flat bottom and expanding circumferentially outward to a cone side wall. This space is blocked by a membrane piston and forms a pump chamber.

EP 0744180 also describes a diaphragm suction pump that is suitable for the simultaneous use of two suction inlets.

In addition, WO 2006/032156 describes a diaphragm pump with three casing parts that are interconnected by means of latches.

SUMMARY OF THE INVENTION

The objective of the invention is to develop a node membrane aspirator, characterized by increased stability.

This problem is solved by the membrane aspirator assembly with the features disclosed in paragraph 1 of the claims.

The membrane aspirator assembly according to the invention comprises a rigid-shaped membrane housing, a rigid-shaped membrane cover made in the form of an integral part and containing a pump chamber having a bottom region and a surrounding bottom region and a side wall expanding outward from it, and also contains a solid wall a pump membrane that has a membrane plate, a flexible membrane piston, at least one inlet valve and at least one outlet valve, the membrane plate being olozhena membrane between the body and the lid membrane and the membrane housing, the pump membrane and the lid membrane are interconnected in a predetermined position relative to each other by means of connecting elements. The diaphragm piston passes through the diaphragm casing and, together with the diaphragm cap, forms a pump chamber or, accordingly, blocks the pump chamber of the cap. According to the invention, more than three connecting elements are provided, which form a material short circuit and / or a geometric short circuit.

The connecting elements connect the membrane housing and the membrane cover to each other, and the pump membrane is held between the membrane housing and the membrane cover. In this case, the connecting elements can pass through the pump membrane, or the pump membrane can be held between the connecting elements.

Material closure and / or geometric closure does not allow the connection to separate independently or, for example, under the influence of vibration. In the case of the frictional closure used so far, it was possible to break the connection between the individual parts, that is, the housing, the membrane and the cover, in particular, when the pump excites vibration in the range of natural vibrations of the device.

In addition, assembly is simplified. Usually assembly is done manually. In practice, it turned out to be easier to assemble when there are many connecting elements and corresponding positioning points than when three corresponding points must be manually aligned. This reduces the risk of warping.

Although the use of more than three connecting elements in itself should have led to static uncertainty, it has been found that overall shape stability is improved. Thus, the use of more than three, in particular six to twelve connecting elements increases the stability and overall rigidity of the device. Due to this, the lid and the membrane body better resist bending, and the assembly exhibits increased tightness, and, accordingly, the risk of losing the assembly's tightness due to temperature fluctuations, vibration or material fatigue is minimized. Preferably, nine connectors distributed over an edge region are used.

Thanks to the use of a larger number of connecting elements, the frequency of the natural oscillations of the system also increases. Sound properties are improved. The tendency to produce spurious noises during the suction process is reduced.

Preferably, the connecting elements are pins that are locked in the receiving holes. They can, for example, be glued, welded or riveted. Instead of pins, elements with a geometrical closure can also be used, for example latches, herringbone latches and other similar means.

A geometric closure can also be used together with a material closure, for example a herringbone welded lock.

In a preferred embodiment, the membrane cover has an approximately constant thickness over its entire area. This prevents distortion and deformation and improves tightness.

The suction unit according to the invention can be inexpensive to manufacture, in particular because it consists of only three parts, and two parts of a rigid shape (body and membrane cover) can be injection molded from plastic, and the pump membrane is preferably injection molded from liquid silicone.

This suction unit is preferably used in breast pumps to express breast milk. However, it is also suitable for other suction pumps, such as drainage pumps.

Other advantageous embodiments are disclosed in the dependent claims.

Brief Description of the Drawings

The essence of the invention is explained below based on the preferred embodiment shown in the accompanying drawings. The drawings show:

Figure 1 is a perspective exploded top view of the site of the membrane aspirator according to the invention.

Figure 2 is a perspective exploded bottom view of the site of the membrane aspirator according to figure 1.

Figure 3 is a perspective view of the membrane body.

Figure 4 is a perspective view of the membrane cover in the second embodiment.

5 is a perspective view of a mounting pin.

6 is a membrane housing with an electric motor, an exploded view.

7 is a perspective exploded view of a membrane aspirator assembly in another embodiment.

The implementation of the invention

In the future, designations of directions, for example, from above and from below, will be used. They relate only to the location of the individual parts in the drawings and are not related to the mounting position of the membrane suction unit according to the invention in the suction pump.

The membrane aspirator assembly according to the invention shown in FIG. 1 comprises a membrane housing 1, a pump membrane 2 and a membrane cover 3. All of these parts are preferably integral. The membrane housing 1 and the membrane cover 3 are rigid in shape and are preferably made by injection molding of plastic, for example thermoplastic plastic, for example polyester. The pump diaphragm 2 is also an integral part and is made by injection molding of liquid silicone.

The membrane housing 1 has a plane-parallel base plate 10 with a circular through hole 11. A stop plate 16 is formed perpendicular to it at one end of the base plate 16. This stop plate 16 has a receptacle 19 for the pump assembly in which a valve (not shown) is held, for example, as open in US 4964851. Inside the receptacle 19 in the thrust plate 16 there is a suction hole 18, which on the back side, shown in figure 2, passes into the suction fitting 18 '.

On the side of the base plate opposite the abutment plate 16, there is shown in FIG. 6 an electric motor 4, which is connected by means of a connecting rod (not shown) to the connecting rod 26 of the connecting rod described below.

As shown in FIG. 2, the thrust plate 16 has an inlet 13 oriented in the direction of the pump diaphragm 2. This inlet 13 is connected to the environment by means of a connecting channel 13 ″ and an inlet channel 13 ′ connected thereto. This can be seen in figure 3.

In addition, the base plate 10, as can be clearly seen in FIG. 1, has a channel 10 ′ on its surface that terminates on the thrust plate 16 in the through hole 10 ″. It serves to install the pin-regulator of the vacuum, not shown in the drawing.

On the lower side of the base plate 10, which is shown in FIG. 2, there is an annular first sealing groove 12. It surrounds the through hole 11, the inlet 13, and also the groove forming the outlet channel 14. This outlet channel is located on the side of the through hole 11, diametrically opposite the inlet 13, and ends at the lateral edge of the base plate 10. At this end, the base plate 10 has an upper channel outlet 17 in the form of a protruding nose with a U-shaped longitudinal section.

On the base plate 10, as a unit with it, the connecting elements are formed, protruding downward in the direction of the pump membrane. These connecting elements in this embodiment are essentially cylindrical pins 15, 15 ', 15' '. However, there may be other connecting elements, for example latches. In this case, the latches are preferably formed on the outer edges of the base plate. This second embodiment is shown in FIG. Hooks 151 are formed along the perimeter of the end surfaces of the membrane housing 1, and the fixing arcs 152 suitable for them are formed on the membrane cover 3. The pump membrane 2 does not need connecting elements, since it is simply clamped between the membrane cover 3 and the membrane housing 1.

The pins 15, 15 ', 15' 'according to the first embodiment are distributed exclusively around the perimeter in the region of the edge of the base plate 10 and outside the sealing groove 12. There are more than three pins 15, 15', 15 ''. In the example presented here, nine pins are provided, with six to twelve pins being preferably used.

In the simplest embodiment, all pins have the same length and thickness. However, it is also possible to use pins of various shapes, as is the case in the proposed example. Some pins, preferably at least two opposing pins 15 ″, are in the form of positioning pins and have a cylindrical rod and a tapered or tapered tip. Some pins, in this case the first pins 15, have a larger diameter compared to the second pins 15 '. The pins 15, 15 ′, 15 ″ may also be provided with vertical ribs 150, as shown in FIG.

The lengths of the pins 15, 15 ′, 15 ″ are chosen so that they pass through the adjacent pump membrane 2 and at least partially extend into the membrane cover 3 or, preferably, completely pass through it and end on its opposite surface.

It is also possible option in which the pins are formed on the membrane cover, or the option in which part of the pins is located on the membrane body, and part on the membrane cover. This is shown in FIG.

The pump membrane 2 located below the base plate 10 also has a substantially plane parallel membrane plate 20. This membrane plate 20 has approximately the same surface as the base plate 10. In the central region, the membrane plate passes into the membrane piston 21, which protrudes from the membrane the plate 20 up in the direction of the base plate 10. The diaphragm piston 21 is in the form of a cap, and preferably it contains annular recesses. In the center of the diaphragm piston 21, a connecting rod 26 in the form of a hollow cylinder is formed. The connecting rod is easily inserted into this socket 26 and is held there by a geometric and power circuit.

A horseshoe-shaped inlet valve 23 is located on one side of the diaphragm piston 21. On the opposite side of the diaphragm piston 21, the diaphragm plate 20 has two substantially horseshoe-shaped exhaust valves 24 spaced apart from each other. There may also be more than one or less than two valves 23. 24.

The membrane plate 20 has an upper sealing roller 22, which on the upper side facing the base plate 10 surrounds the membrane piston 21, as well as the valves 23, 24, has a closed shape and protrudes upward.

Similarly to the above, the membrane plate 20 on the lower side facing the membrane cover 3 has a lower annular sealing roller 28, which also covers the membrane piston 21 and valves 23, 24 and protrudes downward. Preferably, both sealing rollers 22, 28 are congruent.

It is also possible that there is only one of two sealing rollers, or the sealing rollers are not congruent. Instead of the sealing rollers, there may be sealing grooves, and the cover and / or the membrane housing may be provided with corresponding sealing rollers or edges.

A protruding nose 27 is formed on the lateral edge of the membrane plate 20, which protrudes beyond the edge, and is otherwise located at the same level with the upper and lower sides of the plate 20.

On the outside of the sealing rollers 22, 28 in the membrane plate 20, first and second mounting holes 25, 25 'are formed, the diameter of which preferably corresponds to or slightly exceeds the diameter of the corresponding pins 15, 15', 15 '' of the base plate 10.

The membrane cover 3 comprises a cover plate 30, the upper side of which facing the pump membrane 2, also has a substantially flat shape. The lower side, in contrast, is structured as described below. A pump chamber 31 is formed in the center of the lid plate 30. This chamber contains a bottom region located at the same level as the surface of the remaining lid plate 30, and an annular side wall 36 protruding around the perimeter, the side wall being inclined up and out, so that the hole above the bottom area expands. The side wall 36 may have a straight oblique shape or, as shown here, a curved shape.

At least one inlet channel passes through the side wall 36, in the present case, three inlet channels 33 ′ parallel to each other. These channels 33 exit the inlet tank 33, which is made in the form of a recess in the lid plate 30, and end in the bottom region at a distance from the side wall 36. At least one in this case passes through the side wall 36, in this case two radially outwardly directed outlet channels 34 that terminate at some distance from each other outside the side wall 36 on the cover plate 30.

The pump chamber 31, the inlet tank 33, as well as the inlet and outlet

the channels 33 ', 34 are surrounded by a female circumferential second sealing groove 32.

A protruding nose is formed on the lateral edge of the lid plate 30, which, together with the protruding side walls, forms a lower outlet 37 of the channel. This lower outlet 37 of the channel is a part mated to the upper outlet 17 of the channel, and thus preferably has a U-shaped longitudinal section. The size of the aforementioned protruding nose 27 of the pump membrane 2 is selected so that it corresponds to the base area of the outlets 17, 37 of the channel and is held in them.

Outside of the second sealing groove 32, receiving holes 35, 35 ', 35' 'are provided, which include positioning and fixing pins 15, 15', 15 ''. These openings 35, 35 ', 35' 'are flush with the upper side of the cover plate 30. However, on the lower side of the same plate, they are formed in the form of receiving sockets, and they are preferably interconnected by stiffeners 38. Vertical ribs or positioning means may also be provided on the inside of the sockets. Preferably, the internal section of the nests is different from round, preferably it has the shape of a polygon. It also improves the stability of the connection on the pins.

As shown in FIG. 2, the lower side of the lid plate 30 is structured as a negative display of elements formed on the upper side of the lid plate. This means that the grooves of the upper side are bulges on the lower side, and the bulges of the upper side are grooves on the lower side, respectively. Due to this, the cover plate 30 has an approximately constant thickness over its entire area or most of it. However, this is not true for all points. For example, this statement is not true for stiffeners between sockets or between any other bulges on the underside. A structured cover plate of this type can be used, inter alia, for suction units, the connecting elements of which connect individual parts with a friction or power circuit.

In the assembled state of the assembly according to the invention, the pump membrane 2 or, accordingly, its membrane plate 20 is sandwiched between the base plate 10 of the membrane housing 1 and the plate 30 of the membrane cover 3. In this case, the membrane piston 21 passes through the through hole 11 and can move up and down in proportion to the operation of the engine. The membrane piston 21 overlaps the pump chamber 31 and, since the outer diameter of the membrane piston 21 is equal to or greater than the external diameter of the side wall 36 of the pump chamber 31, seals the chamber 31 with the exception of the inlet and outlet channels 33 ', 34.

The mounting pins 15, 15 ', 15' 'pass through the mounting holes 25, 25' of the pump diaphragm 2 and are inserted with a geometric circuit into the receiving sockets 35, 35 ', 35' 'of the membrane cover 3. In addition, they are glued in this place with glue or are connected by snapping with another material. For example, ultrasonic, vibration, high-frequency welding or ultrasonic riveting methods may be used.

Due to this precise positioning of the three separate parts, the inlet 13 coincides with the inlet valve 23, and this valve with the inlet tank 33. The outlet channel 14 of the membrane housing 1 coincides with the outlet valves 24, and these valves with the outlet channels 34 of the membrane cover.

The upper and lower sealing rollers 22, 28 are included in the first and, respectively, second sealing grooves 12, 32 and thus seal the surrounding areas outside.

The side walls of the lower outlet 37 of the channel elastically cover the side walls of the upper outlet 17 of the channel and thus form a tight power and geometric circuit. The spout 27 of the pump membrane 2 is adjacent to the lower outlet 37 of the channel.

The membrane piston 21 in the assembled state of the node passes through the through hole 11 of the base plate 10.

Claims (22)

1. Membrane aspirator assembly with a rigid-shaped membrane body (1), a rigid-shaped membrane cover (3) made in the form of a solid flying and containing a pump chamber (31) having a bottom area and a surrounding bottom area and expanding laterally outward from it a wall (36), characterized in that it comprises a pump membrane (2) made in the form of an integral part, which contains a membrane plate (20), a flexible membrane piston (21), at least one inlet valve (23) and at least at least one exhaust valve (24), wherein the second plate (20) is located between the membrane housing (1) and the membrane cover (3), and the membrane housing (1), the pump membrane (2) and the membrane cover (3) are connected to each other in a position relative to each other by means of connecting elements ( 15, 15 ', 15' '), and the membrane piston (21) passes through the membrane housing (1), and also overlaps the pump chamber (31) of the membrane cover (3), with more than three connecting elements (15, 15') , 15``), and they form a material closure and / or geometric closure. 2. The suction unit according to claim 1, characterized in that the connecting elements (15, 15 ', 15``) are inserted into the receiving holes (35, 35' 35 '') of the housing (1) of the membrane and / or cover (3) membranes and are connected to the membrane case (1) or, respectively, the membrane cover (3) by welding, riveting or glue. 3. The suction unit according to one of claims 1 or 2, characterized in that it provides from six to twelve, preferably nine, connecting elements (15, 15 ', 15' '). 4. The suction unit according to one of claims 1 and 2, characterized in that the connecting elements (15, 15 ', 15' ') pass through the pump membrane (2) exclusively in the region of its outer edges. 5. The suction unit according to one of claims 1 and 2, characterized in that the membrane cover (3) has an approximately constant thickness over its entire area. 6. The aspirator assembly according to one of claims 1 and 2, characterized in that the connecting elements (15, 15 ', 15' ') are pins or latches. 7. The aspirator assembly according to one of claims 1 and 2, wherein at least a portion of the connecting elements (15, 15 ', 15' ') is located on the membrane housing (1). 8. The suction unit according to one of claims 1 and 2, characterized in that at least a portion of the connecting elements (15, 15 ', 15' ') is located on the membrane cover (3). 9. The suction unit according to one of claims 1 and 2, characterized in that the membrane cover (3) and the membrane housing (1) are made of plastic, and the connecting elements (15, 15 ', 15``) are integral with the cover (3) of the membrane or the housing (1) of the membrane, respectively. 10. The suction unit according to one of claims 1 and 2, characterized in that at least a portion of the connecting elements (15, 15 ', 15' ') is provided with longitudinal ribs. 11. The suction unit according to one of claims 1 and 2, characterized in that at least part of the connecting elements (15, 15 ', 15' ') is equipped with positioning means. 12. The suction unit according to one of claims 1 and 2, characterized in that in the cover (3) of the membrane and / or housing (1) of the membrane nest-shaped receiving holes (35, 35 ', 35' ') are formed, intended to capture the connecting elements (15, 15 ', 15``). 13. The aspirator assembly according to claim 12, characterized in that the socket-shaped receiving holes (35, 35 ', 35' ') are interconnected by ribs (38). 14. The suction unit according to claim 12, characterized in that the receiving holes (35, 35 ', 35' ') have a non-circular, in particular, polygonal section. 15. A suction assembly according to one of claims 1, 2, 13, 14, characterized in that the membrane plate (20) has an inlet and an outlet valve (23, 24) and a first sealing roller (22) on one side, the sealing roller (22) completely surrounds the membrane piston (21), and the inlet and outlet valves (23, 24) are located inside the area surrounded by the sealing roller (22), and the connecting elements (15, 15 ', 15' ') pass through the membrane plate (2 ) outside of this annular sealing roller (22). 16. The suction unit according to claim 15, characterized in that the membrane plate (20) on the opposite side has a second sealing roller (28) interacting with the first sealing roller (22), which also surrounds the membrane piston (21), as well as the inlet and exhaust valves (23, 24). 17. The aspirator assembly according to claim 16, characterized in that the first and second sealing rollers (22, 28) are congruent. 18. The suction unit according to one of claims 1, 2, 13, 14, 16, 17, characterized in that the pump membrane (2) is made in the form of an integral part from a flexible material. 19. Membrane aspirator assembly with a rigid-shaped membrane body (1), a rigid-shaped membrane cover (3) made as a single piece and containing a pump chamber (31) having a bottom region and a surrounding bottom region and expanding laterally outward from it a wall (36), characterized in that it comprises a pump membrane (2) made in the form of an integral part, which contains a membrane plate (20), a flexible membrane piston (21), at least one inlet valve (23) and at least at least one exhaust valve (24), and membranes the second plate (20) is located between the membrane housing (1) and the membrane cover (3), and the membrane housing (1), the pump membrane (2) and the membrane cover (3) are connected to each other in a position relative to each other by means of connecting elements ( 15, 15 ', 15' '), and the membrane piston (21) passes through the membrane housing (1), and also overlaps the pump chamber (31) of the membrane cover (3), with more than three connecting elements (15, 15') , fifteen''). 20. Membrane aspirator assembly with a rigid-shaped membrane body (1), a rigid-shaped membrane cover (3) made as a single piece and containing a pump chamber (31) having a bottom area and a surrounding bottom area and expanding laterally but outward from it a wall (36), characterized in that it comprises a pump membrane (2) made in the form of an integral part, which contains a membrane plate (20), a flexible membrane piston (21), at least one inlet valve (23) and at least at least one exhaust valve (24), and membranes the second plate (20) is located between the membrane housing (1) and the membrane cover (3), and the membrane housing (1), the pump membrane (2) and the membrane cover (3) are connected to each other in a position relative to each other by means of connecting elements ( 15, 15 ', 15' '), and the membrane piston (21) passes through the membrane housing (1), and also overlaps the pump chamber (31) of the membrane cover (3), while the connecting elements (15, 15', 15 ' ') form a material short circuit and / or geometric short circuit. 21. Membrane aspirator assembly with a rigid-shaped membrane body (1), a rigid-shaped membrane cover (3) made as a single piece and containing a pump chamber (31) having a bottom region and a surrounding bottom region and expanding laterally outward from it a wall (36), characterized in that it comprises a pump membrane (2) made in the form of an integral part, which contains a membrane plate (20), a flexible membrane piston (21), at least one inlet valve (23) and at least at least one exhaust valve (24), and membranes the second plate (20) is located between the membrane housing (1) and the membrane cover (3), and the membrane housing (1), the pump membrane (2) and the membrane cover (3) are connected to each other in a position relative to each other by means of connecting elements ( 15, 15 ', 15``), the membrane piston (21) passing through the membrane housing (1) and also overlapping the pump chamber (31) of the membrane cover (3), while the membrane cover (3) has an approximately constant thickness over of its entire area. 22. The suction unit according to claim 21, characterized in that the membrane cover (3) has a lower side that faces in the opposite direction to the pump membrane (2) and has a structured shape.

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