DE202017004425U1 - Replaceable pump head for a diaphragm pump - Google Patents

Abstract

A pump head (1) for diaphragm pumps (2) comprising a pump head housing (8) having a plurality of ports (22) formed on the pump head housing (8) and providing both inlets and outlets, a centering ring (21) for centering the pump head housing (8). in a drive housing (6), and a pump head insert (32) comprising a valve receiving body (20) having a plurality of inlet and outlet valves (35, 36) and a plurality of pumping chambers (28), the pumping chambers (28) via the inlet valves (35). with an inlet chamber (56) and via the outlet valves (36) connected to an outlet chamber (55) and the pumping chambers (28) are formed at the top in the valve receiving body (20), a pumping membrane (19) over the pumping chambers (28 ) of the valve receiving body (20) is arranged and this seals leak-free, a swash plate (15), an eccentric disc (14) which is disposed above the swash plate (15), and a frame (17) with several vorzugswei characterized in that the pump head (1) is formed separately from a drive (4) and thus individually exchangeable and a forms a hermetically sealed unit.

Description

Field of the invention

The invention relates to a pump head for a diaphragm pump according to the preamble of claim 1 protection and a diaphragm pump according to the preamble of the protection claim 18th

State of the art

From the DE 10 2008 035 592 B4 a diaphragm pump is known which consists essentially of a pump head connected to a drive with several pumping chambers. The pumping chambers are in each case sealed by means of a pumping membrane with respect to a drive chamber, wherein the respective pumping membrane can be displaced via an associated pumping element into a periodically axial pumping movement. The pumping chambers are connected via inlet valves to an inlet chamber and via an outlet valve to an outlet chamber. In this case, the inlet chamber is arranged centrally and the outlet chamber concentric with the inlet chamber. In the valve plate of this diaphragm pump, a shoulder is provided into which a separate inlet valve plate having the inlet valves can be inserted. This is upstream of the pumping chambers. Also from the DE 101 17 531 A1 and DE 20 2006 020 237 U1 Membrane pumps are known, which consist essentially of a connected to a drive pump head.

Such known diaphragm pumps are used in the pharmaceutical sector for drug production but also in chemistry and biotechnology. As is known, the production of medicaments in the pharmaceutical industry is a very cost-intensive field, so that it is desirable to achieve time savings in the area of cleaning diaphragm pumps, primarily with the aim of reducing costs. Also, the manufacturing costs of diaphragm pumps are very high due to the high sterility requirements and so it is desirable to reduce the cost of manufacturing the pumping elements.

A disadvantage of the known diaphragm pumps that they have a pump head which is firmly connected to the drive, in particular the drive housing and the drive elements. In addition, known in the prior art diaphragm pumps made of metal, mainly made of high-alloy stainless steel which makes the production expensive and the handling of these pumps difficult. Since the pump head is firmly connected to the other elements of the diaphragm pump, the pump head must be completely cleaned after each fluid run. This means that the pumphead must be emptied and sterilized before a new batch of drug can pass through the pulse generator. This means that, for example, after a test run for a special drug several days and even more time-consuming cleaning steps are needed to complete new test runs with this unit. The costs for the cleaning process alone are very high, since cleaning agents, personal and considerable time and the like must be provided. Also before use of the diaphragm pump must be re-used every time, d. H. Validation processes are performed before each new drug run. This is time consuming. In addition, pressure fluctuations occur regularly in the known diaphragm pumps, since these have been designed for standard applications and generate overpressures which adversely affect the flow conditions.

The invention is therefore an object of the invention to improve the previously known diaphragm pumps of the type mentioned so that the pump head can be produced more cheaply and is faster to change and this no longer requires cleaning and emptying, so that significant time savings in drug production in the Pharmaceutical industry are possible. With the present invention, moreover, the speed is to be increased to the marketability of a drug and costs are reduced by the elimination of process validation. Elaborate cleaning methods should be eliminated by the present invention.

This object is achieved in connection with the preamble of claim 1 protection by the characterizing part of claim 1 protection and in conjunction with the preamble of claim 18 protection by the characterizing part of the protection claim 18th

The pump head according to the invention is characterized in that it is designed as a single-use variant for drug production. The pump head is formed separately from the other elements of the diaphragm pump, namely the drive, in particular to the drive unit and the drive housing, and thus individually exchangeable. Advantage is it by the fact that the pump head can be changed relatively easily with two handles. This saves a lot of time. In addition, no Tool for replacing the pump head required, which causes problems in the sterile area anyway. The pump head is made so that it is used only once for a fluid passage, in particular a test run for the manufacture of a drug or the preparation of the drug itself once. As a disposable article, the pump head can be disposed of after use and a new pump head at a next test run or a subsequent drug production to the other elements of the diaphragm pump, more precisely the drive, are connected. This results in savings in the millions for the pharmaceutical industry, because, for example, in a one-week test for a future drug can be saved about three days, and because no cleaning of the same is required because of the replaceable pump head. The conventional pumphead is usually emptied and rendered sterile before it can be reused for a new fluid passage. Since a residual emptying and germ-free cleaning in the inventive pump head is no longer required as a single-use variant, several days of idle for cleaning and emptying can be saved. Consequently, significant cost savings in the pharmaceutical industry are possible due to the pump head according to the invention. The pump head is self-contained and its interior completely hermetically sealed to the outside, only the inlet and outlet is still close to close. The interior is structurally designed for low residual quantities after completion of the test runs.

According to a preferred embodiment of the invention, the pump head, preferably completely, made of plastic. Preference is given to using FDA-compliant plastics, in particular plastics which meet the requirements in the production of medicaments and meet the mechanical stresses. In comparison to the known pumps made of high-alloy stainless steels therefore finds another material, namely plastic use that is lighter than metals and less expensive to manufacture. The design of the pump head made of plastic facilitates the manual attachment to the drive, the other elements of the diaphragm pump and thus the replacement of the pump head. In addition, the pump head can be recycled and thus represents a more environmentally friendly element of a diaphragm pump than the previously known pump head elements of diaphragm pumps. The disposal is cheaper and easier. Elaborate validation processes are eliminated with plastic as a disposable variant.

According to a further preferred embodiment of the invention, the pump head on a 5-chamber system over the known in the art 4-chamber systems. So there are a total of five pumping chambers provided in the valve receiving body into which opens at least one inlet valve per pumping chamber. In a particularly preferred embodiment, the pump chambers differ in their shape from the known circular pump chambers preferably in that they are piriform or pear-shaped. The region of the piriform pumping chamber which tapers towards one end is arranged centrally in the valve receiving body, so that the larger-volume region, which is rounded off to the other end, terminates in the direction of the outer edge of the valve-receiving body. In the tapered region of the pumping chamber is the exhaust valve, which is therefore arranged centrally. In the larger volume region of the pumping chamber, there is preferably in each case an inlet valve which, viewed from the underside of the valve accommodating body, is arranged concentrically with respect to the outlet valves.

In the following, four tables 1a, 1b and 2a, 2b are shown which illustrate the differences between a 5-chamber system and a 4-chamber system. In comparison of a 4-chamber system according to Tables 1a, 1b to a 5-chamber system according to Tables 2a, 2b significantly lower internal pressures can be found in the 5-chamber system. The arrangement of the active terminals in the respective examples and comparative examples, namely once for the liquid inlet and once for the liquid outlet, is provided in a first example and fourth comparative example at a 180 ° angle on the outside of the pump head. In a second example and fifth comparative example, these active terminals are arranged at a 90 ° angle and in a third example and sixth comparative example at the front (corresponding to the bottom side). Table 1a: Pressure and speed values of a 4-chamber system with water 1st example 2nd example 3rd example terminal assembly 180 degrees: Active inlet to active outlet on side housing wall in 180 degree position 90 degrees: Active inlet to active outlet on the side of the housing in 90 degrees position Front: Active inlet and active outlet at bottom Static pressure in Pascal, measured at the inlet side housing wall 809.302 814.047 (-237,403) (Connection of side housing wall not used) Speed in mm / s, measured at the inlet side housing wall 2,472.94 2,472.93 (23,3715) (Connection side housing wall not used) Static pressure in Pascal, measured at the inlet bottom / front (704,574) (front connection not used) (714,092) (Front connection not used) 977.654 Speed in mm / s, measured at the inlet bottom / front (61,9302) (Front connection not used) (55,3904) (front connection not used) 2,472.77 Static pressure in Pascal, measured at the outlet 4,912.81 4,579.17 6,073.68 Speed in mm / s, measured at the outlet 227.787 231.263 231.007 Table 1b: Pressure and velocity values of a 4-chamber system in blood 4th example 5th example 6th example terminal assembly 180 degrees: Active inlet to active outlet on side housing wall in 180 degrees position 90 degrees: Active inlet to active outlet on the side of the housing in 90 degrees position Front: Active inlet and active outlet at bottom Static pressure in Pascal, measured at the inlet side housing wall 787.718 782.738 (-230,959) (Connection of lateral housing wall not used) Speed in mm / s, measured at the inlet side housing wall 2,471.72 2,471.71 (0,0262517) (Connection of lateral housing wall not used) Static pressure in Pascal, measured at the inlet bottom / front (707,783) (front connection not used) (710,07) (front connection not used) 979.036 Speed in mm / s, measured at the inlet bottom / front (56,3939) (front connection not used) (48,7154) (front connection not used) 2,471.39 Static pressure in Pascal, measured at the outlet 4,892.6 4,558.85 6,059.91 Speed in mm / s, measured at the outlet 233.393 236.664 236.405 Table 2a: Pressure and speed values of the 5-chamber system according to the invention in the case of water 1st comparative example 2nd Comparative Example 3rd Comparative Example terminal assembly 180 degrees: Active inlet to active outlet on side housing wall in 180 degrees position 90 degrees: Active inlet to active outlet on the side of the housing in 90 degrees position Front Active inlet and active outlet at bottom Static pressure in Pascal, measured at the inlet side housing wall 188.771 188.375 (-25,3943) (connection side housing wall not used) Speed in mm / s, measured at the inlet side housing wall 1,633.25 1,633.25 (27,9028) (connection side housing wall not used) Static pressure in Pascal, measured at the inlet bottom / front (30,2918) (front connection not used) (30,0233) (front connection not used) 70.7398 Speed in mm / s, measured at the inlet bottom / front (103,997) (Front connection not used) (104) (Front connection not used) 1,632.43 Static pressure in Pascal, measured at the outlet 2,512.74 2,680.44 4,018.15 Speed in mm / s, measured at the outlet 135.315 136.758 136.7 Table 2b: Pressure and speed values of the 5-chamber system according to the invention in blood 4th Comparative Example 5th Comparative Example 6th Comparative Example terminal assembly 180 degrees: Active inlet to active outlet on side housing wall in 180 degrees position 90 degrees: Active inlet to active outlet on the side of the housing in 90 degrees position Front Active inlet and active outlet at bottom Static pressure in Pascal, measured at the inlet side housing wall 186.196 186.234 (2,05115) (connection side housing wall not used) Speed in mm / s, measured at the inlet side housing wall 1,632.91 1,632.91 (0.528212) (Connection of lateral housing wall not used) Static pressure in Pascal, measured at the inlet bottom / front (50,2839) (front connection not used) (50,5011) (front connection not used) 94.4495 Speed in mm / s, measured at the inlet bottom / front (95,2814) (front connection not used) (95,5958) (front connection not used) 1,632.14 Static pressure in Pascal, measured at the outlet 2,509.02 2,690.27 4,007.21 Speed in mm / s, measured at the outlet 137.59 139.013 138.928

In a port arrangement of the active inlet for active outlet on the side housing wall of the pump head in a 180 degree position is a static pressure (in Pascal) in the region of the inlet of the side housing wall in the amount of 809.302 in a 4-chamber system and using the medium of water measurable (Example 1). In this connection arrangement, a speed (in mm / s) of 2,472.94 can be determined at the same measuring point in the inlet area of the lateral housing wall, the measurement taking place inside the pump head at the inlet area. These values are significantly higher in a 4-chamber system and use of the medium of water compared to a 5-chamber system as shown in Table 2a (Comparative Example 1). With the same connection arrangement, the same measuring point and the medium of water, the static pressure in a 5-chamber system is 188.771 Pascals, which is 620.531 Pascals lower. The speed in Comparative Example 1 is 1,633.25 mm / s in a 5-chamber system, with the same measuring point and the medium of water. The speed in a 5-chamber system is thus almost twice as low as in a 4-chamber system.

Another alternative connection arrangement is provided with an active inlet active inlet arrangement on the side housing wall of the pump head in a 90 degree position. The static pressure, which is measured in the inlet area inside the pump head, is 814.047 Pascal in example 2 of the 4-chamber system. The speed at the same measuring point with the same medium of water in this arrangement is 2,472.93 mm / s. In comparison, the static pressure of Comparative Example 2 measured in a 5-chamber system is significantly lower and is 188.375 Pascal, when measured at the same measuring point and using the medium of water. The speed in a 5-chamber system is also significantly lower at 1,633.25 mm / s.

The arrangement of the active ports inlet and outlet at a 180 degree angle on the side housing wall of the pump head or at a 90 degree angle gives no difference in speed when using the medium of water. The speed is the same.

Since the pump head can have several ports for possible use as an inlet and outlet, which are closed in the event of non-use with a stopper, and the inlet area within the pump head on the side housing wall in terms of static pressure and speed can be measured, although the Connection is not used and only a connection use of the front ports, ie the front inlet and the front outlet takes place. In this case, the measurement in a 4-chamber system using the medium water at the measuring point inlet area inside the pump head on the side housing wall, when not in use this inlet and when using the front ports a static pressure value of -237.403 Pascal and a speed value of 23, 3715 of the liquid (Comparative Example 3). In comparison, in Comparative Example 3, in a 5-chamber system, the static pressure value is -25.3943 and the velocity value is 27.9028. The comparison shows that the static negative pressures in a 5-chamber system are lower than in a 4-chamber system.

With respect to Table 1a and the actively used port arrangement, 180 degrees from inlet to outlet on the side housing wall (Example 1), values in the unused inlet area of the front port (inlet port at the bottom) may be 704.574 Pascal (Static Pressure) and 61, 9302 mm / s. In example 2, pressure values of 714,092 and speed values of 55,3904 at a 90 degree positioning of the active ports inlet and outlet on the side housing wall result at the same measuring point.

When using the inlet and outlet front connections (Example 3), the static pressure in the active inlet area on the front side, measured inside the pump head, is 977.654 Pascal and the speed value at the same measuring point is 2.472.77 mm / s. By comparison, in the case of the same arrangement and measuring position and the same medium, namely water, the pressure value in a 5-chamber system according to Comparative Example 3 amounts to 70.7398 Pascal and the speed value to 1632.43 mm / s. The pressure values and speed values in the 5-chamber system are therefore much lower and ensure a more efficient use of the pump.

In a 4-chamber system and the test medium water, according to Example 1, a static pressure in the active outlet region within the pump head can be measured at an inlet inlet to active outlet connection on the side casing wall in a 180 degree position of 4,912.81 Pascal. The speed with the same measuring position and the same medium is 227.787 mm / s in a 4-chamber system. In comparison, the values in a 5-chamber system according to Comparative Example 1 (with the same measuring position and the same medium) are 2,512.74 Pascal and 135.315 mm / s. This in turn shows the enormous increase in efficiency of a 5-chamber system.

When connecting an inlet to the outlet on the housing side wall in 90 degrees position according to Example 2 results in a static pressure in the amount of 4,579.17 Pascal measured at the active outlet within the pump head in a 4-chamber system using the medium of water. The speed is 231.263 mm / s in this experimental setup. In Comparative Example 2 of the 5-chamber system, the static pressure value is 2,680.44 Pascals and the speed value is 136,758 mm / sec.

In a further alternative embodiment, which provides for an active connection arrangement of the inlet and outlet on the front side according to Example 3, static pressure values of 6,073.68 Pascal are obtained, measured at the active outlet area within the pump head in a 4-chamber system and the medium Water. The speed value in this arrangement is 231.007 mm / s. In Comparative Example 3 of a 5-chamber system, the static pressure value is 4,018.15 Pascals and the speed value is 136.7 mm / sec.

With respect to Tables 1b and 2b, the same measuring positions and terminal arrangements are shown in comparison, as in Tables 1a and 2a, but using the medium of blood. A comparison of these values also clearly shows the improvement of the static internal pressure and the speed in a 5-chamber system.

Toward the outlet chamber, the valve receiving body of the pump head preferably has five outlet valves. The outlet chamber is arranged centrally inside lying in relation to the inlet chambers in the valve receiving body. The chamber geometry is designed using CFD (Computational Fluid Dynamics) analysis flow-favored.

In a further preferred embodiment of the pump head according to the invention, the pump head housing is cylindrical upwardly open with a lateral housing wall and a bottom closing down, at least two ports, preferably an inlet and an outlet, horizontally and in the 90 ° bend on the side Housing wall, more preferably three horizontally and arranged in the 90 ° bend ports on the side housing wall, and at least two front-side ports (bottom ports in the figures), preferably an inlet and an outlet, are provided.

The connections, which can preferably be selected individually as exits and exits, can be used variably, depending on the customer's requirements. They are preferably multifunctional. The pumphead housing preferably has three ports, preferably two outlets and one inlet, on the lateral housing wall. The pumphead housing preferably has two ports, preferably an inlet and an outlet at the bottom of the pumphead housing.

The unnecessary connection openings must be closed. This is done in a preferred embodiment with a blind closure (plug or blind plug), which closes the opening leak-free by means of a Schneppersystems or seamlessly produced thread. This achieves a high degree of tightness and long-term stability, since the sealing takes place via a sealing collar and additional parts, such as O-rings, are dispensed with. Since the pump head is a single-use variant, the customer can close the connection with the blind plug once. The blind plug can be attached via a click fastener and can then no longer be removed. Optionally, the blind plug is attachable via a thread, which is preferably made seamless and can be disassembled again. The customer can therefore choose the connections that he needs for the liquid run and then, since it is the pump head is a disposable variant, close the not in use connections before startup with the blind plug. The multifunctionality of the connections provides the customer with a high degree of flexibility in using the pump head.

Furthermore, the pump head according to the invention preferably comprises on the underside (corresponding to the front side) an overflow valve for reducing operating or system-related overpressures. The overflow valve is hermetically connected to the pump head housing and allows constant flow conditions. The overflow valve or pressure relief valve reduces pressure peaks by relieving the system when the set pressure is exceeded. Advantageously, the overflow valve can be installed independently of position horizontally or vertically in the pump head housing. It is therefore versatile.

More preferably, the spill valve is connected by means of simple screw on the pump head housing so that it can be easily and quickly mounted and dismounted.

In a particularly preferred embodiment, the overflow valve of the pump head according to the invention is infinitely adjustable. The adjustment ranges are from 0.2 to 6 bar, in particular from 0.2 to 5 bar and particularly preferably from 0.4 to 5 bar. Preferably, the pressure-holding valve is infinitely adjustable. It can also be adjusted during the pumping process, so that the valve setting is possible even under working pressure. Pressure peaks and pulsations are reliably reduced. The valve preferably has a small hysteresis. The housing of the overflow valve consists of PP, PVDF and PTFE and thus has a high resistance to media and complies with all approval standards for the biopharmaceutical sector. At normal pump internal pressure, the liquid or the product is located in the respective part of the pump head, where it is led to the respective outlets during normal pumping. As soon as the pump internal pressure increases, the membrane opens when the set upper value is reached and lifts off against the spring. In this position, a channel is released, which dissipates the pressure peak to the inlet of the pump, thus providing a bypass conveyance. A constant flow of funding is the result. The spring force can be adjusted during operation and is finely adjustable due to the large membrane area.

In a further preferred embodiment, the overflow valve is completely formed of plastic, wherein the adjusting spring is preferably provided as a plate spring package in plastic. Alternatively, the spring can also be designed as a ring spring preferably metallic, so that the valve is almost completely made of plastic. With the complete plastic version, the complete pump head is metallic free. But even with the metallic ring spring, the remaining components of the overflow valve are completely made of plastic. The permissible media temperature in connection with the valve depends on the base material. For example, a temperature of 120 ° C is permissible for the design of the housing in PVDF and for a version in PTFE of 150 ° C.

The membrane of the pump head unit is designed in a particular preferred embodiment so that it completely spans the valve body with the pumping chambers. In this case, the outer border of the membrane is designed such that it projects upwards and downwards only a few millimeters from the membrane surface. The downwardly projecting projection of the membrane border engages in a groove which is provided according to the upper side of the outer border of the valve receiving body. The membrane surface itself spans the entire inner region of the valve receiving body, starting from the outer edge of the valve receiving body. So it is not, as usually five membranes required, which are each arranged individually over the pumping chambers, but only a membrane unit can be made as a piece of inexpensive and easy to be arranged on the valve receiving body. In particular, the attachment of the membrane to the valve receiving body and in the pump head unit is thereby simplified and can be done quickly, compared to five individual membranes, which must be arranged individually above the respective pumping chamber. This also leads to time savings in the manufacture of the pump head insert.

In a further embodiment of the pump head, the membrane is formed from a permanently elastic, in particular walktauglichen material. The material is preferably plastic. As a result, the mobility of the membrane is excellent in terms of their suction and pressure properties.

According to a further preferred embodiment of the invention, the membrane is provided in the suction and pressure direction to the respective pumping chamber out (on its underside) bulged surfaces, the bulge of the shape and dimension of the inlet valve plate is adjusted. The membrane also has a plurality of downwardly projecting bezels, which engage in a groove which surrounds each of the pumping chambers at their upwardly open side. The membrane thereby hermetically seals the respective pumping chambers. The downwardly projecting enclosure is preferably formed piriförmig corresponding to the respective pumping chamber, the preferably piriförmige enclosure preferred in a corresponding piriform formed groove engages which surrounds the pumping chambers at their upwardly open, formed in the valve receiving body side.

In a further preferred embodiment, a plurality of, preferably five, annular bulges projecting upwards are provided on the upper side of the membrane. The inner diameter of the highest point of these annular bulges is equal to the outer diameter of the bulged down surfaces.

According to a further preferred embodiment of the invention, a respective, preferably plasticized, pressure piece is provided in the center of the respective annular bulges of the membrane, which cooperates with a plunger which is attached to a swash plate of a drive unit to be set in a pumping motion. The membrane is structurally designed with the vertically vertically cast-in pressure piece, which preferably specifies a closing size of 3.5 °, so that an optimum efficiency can be achieved. The preferred closing size of 3.5 ° refers to the resting state of the membrane. The closing dimension can also be more or less, but in particular between 2.0 ° and 6.5 °. The closed size refers to the bulged surfaces of the membrane projecting downwards and the annular bulges protruding upward from the membrane. The horizontal cross-section of the membrane is the starting point for the design at 0 °. At a 3.5 ° angle are the protrusions. The angle of attack depends on the position of the eccentric shaft and can be changed individually within a certain range. Thus, the flow rate can be regulated because the stroke is reduced or enlarged, which results in that the delivery rate is variable.

Further preferably, the invention provides a diaphragm pump having a drive connected to the pump head described above. In this case, the pump head is detachably fastened to the drive by means of a plurality of holding clamps or clamping straps, preferably two holding clamps. This quick-release mechanism is advantageous for the time-saving installation of the replaceable pump head on the other pumping elements, in particular the drive. In addition, a functionally reliable assembly of the pump heads is ensured. The disassembly is just as quickly possible as the installation of the pump head, which is releasably secured via the retaining clips to the drive housing.

According to a preferred embodiment, the holding clamps are equipped with a snap bracket, which engages in a groove on the pump head. The groove is circumferentially provided on the side wall of the pump head housing, so that at the same time a large individuality in the position of the arrival and departure of the connections is possible. When the holding clamps are tightened, the snap-in clip pulls the pump head over the groove so close to the drive that the pump head with the drive is hermetically sealed to one another.

The membrane pump according to the invention preferably has an electronic-hydraulic drive. Due to the hydraulic flow favoring of the liquids is achieved.

Brief description of the drawings

In the drawings show:

1 an exploded view of a diaphragm pump consisting of a drive and a pump head

2 an exploded view of the pump head or the pump head unit according to the invention

3 an exploded view of the pump head insert

4 a side view of the pump head housing with overflow valve

5 a side view of the diaphragm pump with drive and pump head and overflow valve

6 a side view of in 5 shown diaphragm pump, cut along the line AA

7 a side view of the pump head unit with overflow valve and the in

9 shown drive unit, along the line KK of in 7a cut diaphragm pump shown

7a a bottom view of the diaphragm pump

7b an enlarged view of the encirclement L from 7

8th a perspective view obliquely from above of the membrane and the valve receiving body

8a a perspective cross-sectional view obliquely from below on one half of in 8th shown diaphragm and the valve receiving body

8b a side view of the membrane, in cross section

8c a side view of the valve receiving body, in cross section

9 an exploded view of the drive unit

In the 1 shown diaphragm pump 2 consists of a drive 4 with an in 9 shown drive unit 3 and a pump head unit 1 , on the underside of which an overflow valve 5 is arranged. The drive 4 consists of a drive or motor housing 6 in which is the drive unit 3 located. On two opposite sides of the drive housing 6 there is a holding clamp in each case 7 (here only one visible) for attaching the drive housing 6 on a pump head housing 8th , The retaining clip 7 includes a clamp 9 whose lower, inwardly bent end 10 in a groove 11 at the pump head 1 intervenes. When folding up the closure element 12 pulls the clamp 9 the pump head housing 8th firmly to the drive housing 6 approach. The drive unit 3 is screwed via a centering disc 13 with the eccentric disc 14 the pump head unit 1 connected. This is where the in 2 illustrated in detail pump head unit 1 together from the eccentric disc 14 , a plunger plate or swash plate 15 with five pestles 16 a frame 17 with five circular frame openings 18 for receiving the plunger 16 , a membrane 19 , a valve receiving body 20 , a centering ring 21 , a pump head housing 8th with several connections 22 as well as an overflow valve 5 , The centering ring 21 is by means of countersunk screws 23 on the pump head housing 8th attaches and centers the top end 24 of the pump head housing 8th in the drive housing 6 ,

In 2 the pump head elements are shown in an exploded view. In this case, the pump head housing 8th in this embodiment, a total of five openings 25 for five multifunctional connections 22 on, each with a stopper 26 are closable. Two of the connection openings 25 are located at the bottom (not visible), three of them on the side of the case (two visible). The overflow valve 5 is at the bottom in the area of the bottom 27 of the pump head housing 8th arranged. In this embodiment, there are five pumping chambers 28 concentric in the valve receiving body 20 arranged. The five pumping chambers are pear-shaped, wherein the round-shaped large-volume region of the chamber is located on the outer edge of the valve receiving body and the tapered region of the chamber is located centrally in the valve-receiving body. In 8th the piriform is described in more detail. Above the valve receiving body 20 is the membrane 19 arranged. This shows five annular bulges 29 one button at a time 30 Towards the frame 17 have and there the respective frame openings 18 hermetically seal. The annular bulges 29 fall in the region of their inner diameter down towards the push button 30 from. At the bottom of the membrane 19 also form five corresponding bulged areas 31 (not visible). These bulged surfaces 31 down are in 8th described in more detail. The annular bulge 29 towards the top is in 8th clearly visible. In assembled arrangement of a pump head insert 32 who in 3 described and illustrated, which is in the membrane 19 cast in push button 30 vertically upwards through the respective frame openings 18 of the frame 17 through, leaving the recess 33 in the pestle 16 the protruding part of the push button 30 includes. Above the plunger plate 15 is the eccentric disc 14 , which with five countersunk screws 34 with the plunger plate 15 is screwed.

In the valve receiving body 20 are five pumping chambers 28 shown. The membrane 19 sees a total of five pushers 30 in front, at the top of the membrane 19 protrude and in contact with the respective pestles 16 the swash plate 15 to step. The frame 17 has five frame openings 18 on, which down with the annular bulges 29 the membrane 19 are sealed. The upper part of the tight in the membrane 19 potted pressure piece 30 reaches into the frame opening 18 into it. The eccentric disc 14 is with the five countersunk screws 34 to the plunger plate 15 connected.

3 shows the pump head insert 32 , the eccentric disc 14 , Plunger plate 15 , Frame 17 , Membrane 19 and valve receiving body 20 with sealing ring 38 consists. In this embodiment, the intake valves 35 outboard and the exhaust valves 36 arranged on the inside. At the bottom of the valve holder body 20 is a sealing ring 38 provided, which is the outlet chamber 55 in the case 8th seals.

The pump head housing 8th is velvet side view of the spill valve housing 37 in 4 shown. The exploded view shows three laterally arranged multifunctional connections 22 and two at the bottom of the pump head housing 8th arranged connections 22 , The connections 22 are each with a sealing ring 50 to the pump head housing 8th connected. Four of the connections 22 are with a stopper 26 Mistake. The overflow valve 5 is decentralized at the bottom 27 of the pump head housing 8th arranged and screwed to the housing 8th attached.

5 shows a side view of the diaphragm pump 2 , There are two lateral connections 22 on the pump head housing 8th as well as two connections 22 (shown in perspective to each other) at the bottom 27 of the pump head housing 8th visible, noticeable. The overflow valve 5 is decentralized at the bottom 27 of the pump head housing 8th , The clamping bracket shown in the drawing 9 the holding clamp or clamping strap 7 engages in a groove 11 of the pump head housing 8th one, which is the side wall of the housing 8th surrounds and fixes the pumphead housing 8th to the drive 4 , The locking lever 12 the clamp 7 is in closed condition.

6 shows a side view in longitudinal section AA of in 5 shown diaphragm pump 2 , The flange 39 of the cylinder head 40 of the drive 4 is with several cylinder head bolts 41 on the drive housing 6 attached. At the bottom of the drive 4 is the pump head 1 by means of holding clamps 7 attached. The lower end engages 10 of the clamp 9 the retaining clips 7 in the laterally circumferential groove 11 of the pump head housing 8th one. The pump connections 22 are with the sealing ring 50 to the pump head housing 8th connected. The valve receiving body 20 is with the membrane 19 and the frame 17 completely in the pump head housing 8th taken, with the centering ring 21 as interface between pump head housing 8th and drive housing 6 acts. The eccentric disc 14 protrudes into the drive housing 6 into it.

In 7 is the pump head 1 with the drive unit 3 without cylinder head 40 in a side view, along the line KK of in 7a shown diaphragm pump 2 cut, shown. The eccentric 42 extends through the opening in the upper side of the motor housing 6 in the engine compartment 43 into it. The elements of the drive unit 3 are complete with ball bearings 43 . 44 visible and in detail in 9 shown. A membrane 45 the overflow valve 5 is together with spring 46 in the valve 5 shown.

7b is an enlarged view of the spill valve 5 , according to magnification L of 7 , The overflow valve 5 is at the bottom 27 of the pump head housing 8th arranged. The membrane 45 seals an outlet 47 and an inlet 48 towards the liquid chamber 49 the pump head 1 from. The feather 46 is below the membrane 45 in the valve housing 37 arranged. When an increased pump internal pressure is reached, the diaphragm opens 45 and rises against the spring 46 from. This will be a channel or ring channel 51 released, which is the pressure peak to the inlet 48 the pump 2 dissipates. This allows a constant flow in the pump 2 be maintained.

8th shows an exploded view of the membrane 19 and the valve receiving body 20 , Three of the five pumping chambers 28 of the valve receiving body 20 are clearly visible in an oblique plan view. The with reference numerals 28 in 8th directly marked pumping chamber has a kind of piriform. The large-volume region of the piriform chamber is arranged on the outer edge of the valve receiving body. Towards the center of the valve receiving body then the pumping chamber tapers, so that there is a pear-like shape. Here, a side connecting the large volume portion to the apex of the taper of the pumping chamber is straight (this is the reference numeral of reference numeral 28 marked side) and the opposite side at its center, between the lower end of the bulky area at the outer edge and upper end of the tapered area, slightly curved inwards. At this slightly inwardly curved central point of the reference numerals 28 in 8th directly marked pump chamber adjoins the upper end of the taper of the fully apparent pumping chamber of 8th at. Five annular bulges 29 the membrane 19 that the respective centrally within the respective bulge 29 arranged pressure piece 30 circling and protruding upward are visible. Also a piriform or pear-shaped groove 52 which the individual pumping chambers 28 at its upwardly open in the valve receiving body 20 formed Page outlined is good at three pumping chambers 28 seen. In this groove 52 grabs the corresponding piriform enclosure 53 one, which at the bottom (not visible here) of the membrane 19 is provided.

8a shows a sectional view through the in 8th shown membrane 19 and the valve receiving body 20 , On the bottom 54 of the valve receiving body 20 is the outlet chamber 55 shown in which the exhaust valves 36 (here three visible) flow. The exhaust valves 36 are preferably designed as diaphragm valves. There is an outlet valve 36 shown in section. An inlet valve 35 is also shown in section, with the intake valves 35 (here three visible) one at the bottom 54 of the valve receiving body 20 provided inlet chamber 56 is upstream. The intake valves 35 are preferably also designed as a diaphragm valve. The preassembled pressure piece 30 is with the membrane 19 firmly potted (plasticized). On the bottom 57 the membrane 19 is one of several of the membrane surface 58 downwards protruding piriform enclosures 53 the membrane 19 completely shown. The outer border 59 the membrane knows upwards and downwards from the membrane surface 58 protruding, the outer edge 59 the membrane circumferential projections 59 ' . 59 '' on. The projection projecting downwards 59 ' the membrane border 59 is designed so that this in a corresponding to the valve receiving body 20 trained matching groove 60 located at the top of the outer border of the valve body 20 is provided, can intervene. The groove 60 , which at the top of the outer border of the valve receiving body 20 is provided is in 8a shown.

8b shows the membrane 19 in cross-section and at rest. The perpendicular to the membrane 19 cast-in pressure piece 30 , which specifies the closing size, is at rest. In this embodiment, there is an illustrated locking dimension of 3.5 degrees. The in the outer edge region of the membrane 19 visible annular bulge 29 is at an angle of 3.5 degrees from the horizontal membrane surface 58 (= 0 °) upwards.

8c shows the valve receiving body 20 , which in the lower area an outlet chamber 55 and several inlet chambers 56 (one shown here) has. Also an inlet valve 35 and an exhaust valve 36 are shown in section.

9 shows an exploded view of the drive unit 3 , This includes several drive elements. Including the eccentric 42 , several retaining rings 61 . 61 ' two ball bearings 43 . 44 , the centering disc 13 and a bearing pressure washer 63 that with a countersunk screw 64 to the eccentric 42 is attached.

LIST OF REFERENCE NUMBERS

1

Pump head unit / pump head

2

Diaphragm pump / pump

3

drive unit

4

drive

5

Overflow valve / valve

6

Drive or motor housing

7

Retaining clip / clamp / clamping tab

8th

Pump head casing / housing

9

clamp

10

lower, inwardly bent end of the clamp

11

groove

12

Locking element / locking lever of the retaining clip

13

centering

14

eccentric

15

Plunger plate or swash plate

16

tappet

17

frame

18

frame opening

19

membrane

20

Valve receiving body

21

centering

22

Connections / pump connections

23

countersunk screws

24

Upper end of the pump head housing

25

Opening in the pump head housing

26

Plug

27

Bottom or bottom of the pump head housing

28

pumping chamber

29

annular bulge

30

Pushbutton / pressure piece

31

bulging surface

32

Pump head use

33

tappet recess

34

countersunk screws

35

intake valves

36

exhaust

37

Spill valve / valve body

38

seal

39

flange

40

cylinder head

41

Head Bolt

42

eccentric

43

lower ball bearing

44

upper ball bearing

45

Diaphragm of the overflow valve

46

feather

47

outlet

48

Intake / intake

49

liquid chamber

50

seal

51

channel

52

piriform groove

53

piriform mount

54

Bottom of the valve holder body

55

outlet

56

inlet chamber

57

Bottom of the membrane

58

membrane area

59

Outer border of the membrane

59 '

downward protruding projection

59 ''

upward projection protruding

60

groove

61, 61 '

Retaining rings

63

Location edge jerk disc

64

Senkschraube

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008035592 B4 [0002]
• DE 10117531 A1 [0002]
• DE 202006020237 U1 [0002]

Claims (20)

Pump head ( 1 ) for diaphragm pumps ( 2 ) comprising a pump head housing ( 8th ) with several connections ( 22 ) on the pump head housing ( 8th ) and provide both inlets and outlets, a centering ring ( 21 ) for centering the pump head housing ( 8th ) in a drive housing ( 6 ), and a pump head insert ( 32 ), comprising a valve receiving body ( 20 ) with a plurality of inlet and outlet valves ( 35 . 36 ) and several pumping chambers ( 28 ), the pumping chambers ( 28 ) via the inlet valves ( 35 ) with an inlet chamber ( 56 ) and the exhaust valves ( 36 ) with an outlet chamber ( 55 ) and the pumping chambers ( 28 ) at the top in the valve receiving body ( 20 ), a pumping membrane ( 19 ) above the pumping chambers ( 28 ) of the valve receiving body ( 20 ) is arranged and this seals leak-free, a swash plate ( 15 ), an eccentric disc ( 14 ), which over the swash plate ( 15 ) and a frame ( 17 ) with a plurality of preferably circular frame openings ( 18 ) for receiving a plurality of rams ( 16 ) located at the bottom of the swash plate ( 15 ) are arranged, characterized in that the pump head ( 1 ) separately from a drive ( 4 ) is formed and thus individually exchangeable and forms a hermetically sealed unit. Pump head ( 1 ) according to claim 1, characterized in that the pump head ( 1 ) is made of plastic and recyclable. Pump head ( 1 ) according to claim 1 or 2, characterized in that the valve receiving body ( 20 ) five pumping chambers ( 28 ), each pumping chamber ( 28 ) at least one inlet valve ( 35 ) is provided. Pump head ( 1 ) according to claim 3, characterized in that the valve receiving body ( 20 ) to the outlet chamber ( 55 ) five exhaust valves ( 36 ) having. Pump head ( 1 ) according to claim 1, characterized in that the pump head housing ( 8th ) preferably cylindrical and open at the top, with a lateral housing wall and a bottom closing off bottom ( 27 ) and at least two connections ( 22 ), preferably an inlet and an outlet on the lateral housing wall and at least two connections ( 22 ), preferably an inlet and an outlet at the bottom ( 27 ) of the pump head housing. Pump head ( 1 ) according to claim 1, characterized in that the connections ( 22 ) are individually interchangeable and are preferably designed as multifunctional connections. Pump head ( 1 ) according to claim 1, characterized in that the connections ( 22 ), which are out of service, with a stopper ( 26 ), preferably a blind plug, are leakproof closed. Pump head ( 1 ) according to claim 1, characterized in that the pump head housing ( 8th ) preferably at the bottom ( 27 ) an overflow valve ( 5 ) to reduce work or system related overpressures hermetically connected to the pump head housing ( 8th ) connected is. Pump head ( 1 ) according to claim 8, characterized in that the overflow valve ( 5 ) by means of a screw connection on the pump head housing ( 8th ) is attached. Pump head ( 1 ) according to claim 8 or 9, characterized in that the overflow valve ( 5 ) continuously, preferably during the pumping operation under working pressure, from 0.2 to 6 bar, in particular from 0.2 to 5 bar, more preferably from 0.4 to 5 bar is adjustable. Pump head ( 1 ) according to one of claims 8, 9 or 10, characterized in that the adjusting spring ( 46 ) of the overflow valve ( 5 ) is designed as a ring spring or as a plate spring package, preferably metallic or plastic. Pump head ( 1 ) according to one of claims 8, 9 or 10, characterized in that the overflow valve ( 5 ) is formed of plastic. Pump head ( 1 ) according to claim 1, characterized in that the membrane ( 19 ) the valve receiving body ( 20 ) with the pumping chambers ( 28 ) completely overstretched. Pump head ( 1 ) according to claim 1, characterized in that the membrane ( 19 ) is made of a permanently elastic, especially walktauglichen plastic material. Pump head ( 1 ) according to claim 1, characterized in that the membrane ( 19 ) in the suction and pressure direction to the respective pumping chamber ( 28 ) curved surfaces ( 31 ), which is adapted to the shape and dimensions of the inlet valve disk and the membrane a plurality of downwardly projecting, preferably piriform formed enclosures ( 53 ), which in a, preferably piriform groove ( 52 ), which the individual pumping chambers ( 28 ) at its upwardly open in the valve receiving body ( 20 ) formed side, engages and the pumping chambers ( 28 ) hermetically seals. Pump head ( 1 ) according to claim 1, characterized in that the membrane ( 19 ) at its top several, preferably five annular bulges ( 29 ) whose inner diameter at the highest point of the annular bulge ( 29 ) equal to the outer diameter of the downwardly bulging surfaces ( 31 ). Pump head ( 1 ) according to claim 16, characterized in that in the center of the annular bulges ( 29 ) one, preferably plasticized, pressure piece ( 30 ) provided with a plunger ( 16 ) mounted on a swash plate ( 15 ) a drive unit ( 3 ) is mounted, cooperates to be placed in a pumping motion. Diaphragm pump ( 2 ) formed from one with a drive ( 4 ) connected pump head ( 1 ) according to at least one of the preceding claims, characterized in that the drive ( 4 ) a drive unit ( 3 ), which within a drive housing ( 6 ), wherein, the pump head ( 1 ) by means of several, preferably two retaining clips ( 7 ), which on opposite side housing surfaces of the drive housing ( 6 ) are arranged to the drive ( 4 ) is releasably attached. Diaphragm pump ( 2 ) according to claim 18, characterized in that the plurality, preferably two retaining clips ( 7 ) with a snap bracket ( 9 ) fitted in a groove ( 11 ) on the pump head ( 1 ) engages, so that when closing the retaining clips ( 7 ) the snap bracket ( 9 ) the pump head ( 1 ) to the drive ( 4 ) and hermetically with the drive ( 4 ) closes. Diaphragm pump ( 2 ) according to claim 18, characterized in that this an electronically hydraulic drive ( 4 ) and operates pulsation-free.

Images