ES2885125T3 - Replaceable pump head for a diaphragm pump - Google Patents

Abstract

Pump head (1) for diaphragm pumps (2), comprising a pump head casing (8) with various connections (22) that are made in the pump head casing (8) providing both inlets and outlets, a centering ring (21) for centering the pump head casing (8) within a drive casing (6), and a pump head insert (32) comprising a valve housing body (20) with several inlet and outlet valves (35, 36) and several pumping chambers (28), the pumping chambers (28) being connected to an inlet chamber (56) through the inlet valves (35) and to a chamber (55) through the outlet valves (36), and the pumping chambers (28) being made on the upper side inside the valve housing body (20), a pumping membrane (19) which is arranged above the pumping chambers (28) of the valve housing body (20) sealing them without leaks, an osc disc ilante (15), an eccentric disc (14) that is arranged above the oscillating disc (15) and a frame (17) with several preferably circular frame openings (18) to accommodate several pushers (16) that are arranged on the side lower part of the oscillating disc (15), the pump head (1) being made separately from a drive (4) and therefore being able to be replaced individually, characterized in that the pump head forms a hermetically sealed unit, presenting the body with valve housing (20) five pumping chambers (28) with at least one inlet valve (35) each, and the pump head (1) being made of synthetic material and being recyclable.

Description

DESCRIPTION

Replaceable pump head for a diaphragm pump

field of invention

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

State of the art

From DE102008035592B4 a diaphragm pump is known which substantially consists of a pump head, connected to a drive, with several pump chambers. The pump chambers are each sealed with respect to a drive chamber by means of a pump diaphragm, the respective pump diaphragm being able to be brought into a periodic axial pumping movement via an associated pump element. The pumping chambers are connected to an inlet chamber through inlet valves and to an outlet chamber through an outlet valve. The inlet chamber is centrally arranged and the outlet chamber is concentric with the inlet chamber. Provided on the valve plate of this diaphragm pump is a shoulder into which a separate inlet valve plate having the inlet valves can be inserted. This is in front of the pumping chambers. Diaphragm pumps are also known from DE10117531A1 and DE202006020237U1, which substantially consist of a pump head connected to a drive.

Another membrane pump is described in US patent application US2011/0070107A1. This pump comprises a disposable pump head with an inlet and outlet channel. The pump head is easy to replace, so maintenance, especially cleaning and/or disinfection, is not necessary. Here, it is advantageous that the next application or the next procedure can be started with a small time delay.

Known diaphragm pumps of this type are used in the pharmaceutical sector for the production of medicaments, but also in chemistry and biotechnology. As is known, the manufacture of drugs in the pharmaceutical industry is a sector with very high costs, so it is desirable to achieve time savings in the field of cleaning diaphragm pumps, mainly with the aim of reducing costs. Also the manufacturing costs of diaphragm pumps are very high because of the high sterility requirements and therefore it is desirable to reduce the manufacturing costs of the pump elements.

The disadvantage of the known diaphragm pumps is that they have a pump head which is permanently connected to the drive, in particular to the drive housing and the drive elements. In addition, the membrane pumps known in the state of the art are made of metal, mainly high-alloy stainless steel, which makes production more expensive and difficult to handle these pumps. Since the pump head is permanently connected to the other elements of the diaphragm pump, the pump head must be thoroughly cleaned after each liquid flow. This means that the pump head must be completely emptied and sterilized before a new batch of medication can run through the group. This leads to the fact that, for example, after a test operation for a special medicament, for example, several days and time-consuming additional cleaning steps are required to carry out new test operations with this group. The costs of the cleaning process alone are very high, since cleaning agents, personnel and considerable time and the like must be provided. Before using the membrane pump, it is also necessary to carry out validation processes each time anew, that is, before each new step of a drug. This requires a lot of time. In addition, pressure fluctuations regularly occur in known diaphragm pumps, since they were designed for standard applications, and overpressures occur that negatively influence the flow conditions.

The object of the invention is therefore to improve the previously known diaphragm pumps of the aforementioned type in such a way that the pump head can be produced more economically, is made lighter in weight and can be changed more quickly than the interchangeable pump heads known from the state of the art and no longer requires any cleaning or complete emptying, so that considerable time savings are possible in the manufacture of medicaments in the pharmaceutical industry. Furthermore, the present invention aims to increase the speed until a drug is ready for the market and reduce costs by eliminating process validation. The present invention aims to eliminate complicated cleaning procedures. It is intended to facilitate manual mounting of the pumphead on the drive and replacement of the pumphead. Furthermore, it is intended to provide a more environmentally friendly pump head that can be recycled. At the same time, it is intended to ensure absolute tightness and increased safety of the pump head due to the configuration of the pump head. Furthermore, it is intended to reduce the pulsation of the liquid in the pump head.

This objective is achieved in relation to the preamble of claim 1 by the characterizing part of the claim 1 and in relation to the preamble of claim 18 by the characterizing part of claim 18.

The pump head according to the invention is characterized in that it is designed as a single-use variant for the production of medicaments. The pump head is made separately from the other elements of the diaphragm pump, namely the drive, in particular the drive unit and the drive casing, and can therefore be replaced individually. The advantage is that in this way the pump head can be changed relatively easily with two operations. This saves a lot of time. In addition, no tools are required to replace the pump head, which would still cause problems in the sterile area. The pump head is preferably made in such a way that it is used only once for one passage of a liquid, especially a test operation for the manufacture of a medicament or the manufacture of the medicament itself. As a disposable item, the pump head can be disposed of after use and a new pump head can be connected to the other elements of the diaphragm pump, more precisely to the drive, for the next test operation or drug manufacturing following. In this way, millions of dollars are saved for the pharmaceutical industry, because, for example, in the case of a one-week test for a future drug, approximately three days can be saved, in particular, because due to the replaceable pump head that already no cleaning is required. Typically, the conventional pump head is completely emptied and sterilized before it can be reused for the passage of a new liquid. Since no residual emptying or sterile cleaning is required in the pump head according to the invention as a single-use variant, several days of downtime can be saved by cleaning and residual emptying. Considerable cost savings are therefore possible in the pharmaceutical industry by the pump head according to the invention.

The pump head is designed to be self-enclosed and its interior is completely hermetically sealed to the outside. Only the input and output should preferably be finally closed. The interior space is made in terms of its construction for small residual quantities once the test operations have been completed.

The pump head is made entirely of synthetic material. FDA-compliant synthetic materials are preferably used, especially synthetic materials that meet the requirements in the manufacture of medicaments and that withstand mechanical loads. Compared to known pumps made of high-alloy stainless steels, therefore, another material is used, namely synthetic material, which is lighter than metals and cheaper to manufacture. The construction of the pump head in synthetic material facilitates manual assembly on the drive, the other elements of the diaphragm pump and, therefore, the replacement of the pump head. Furthermore, the pump head can be recycled and thus represents a more environmentally friendly element of a diaphragm pump than previously known pump head elements of diaphragm pumps. Disposal is cheaper and easier. In the case of synthetic material as a single-use variant, the complex validation processes are eliminated. Preferably, the pump head casing is made of polypropylene (P ^p ), polyvinylidene difluoride (PVDF) and/or polytetrafluoroethylene (PTFE) and thus exhibits high media resistance.

The pump head has a 5-chamber system compared to the 4-chamber system known in the prior art. With the 5-chamber system, the pulsation of the liquid in the pump head, especially in the group, can be reduced. This is advantageous compared to the 4-chamber system. In the following tables, 4-chamber systems are compared to 5-chamber systems. Therefore, a total of five pumping chambers are provided in the valve housing body, into which at least one inlet valve opens for each 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 pear-shaped or pear-shaped. The area of the pear-shaped pumping chamber that ends in a point at one end is arranged centrally in the valve housing body, so that the area of greater volume, rounded towards the other end, ends towards the outer edge of the body valve housing. Preferably, the outlet valve is located in the constricted area of the pump chamber, which is therefore arranged centrally. In each case, there is preferably an inlet valve located in the larger volume area of the pump chamber, which, seen from the underside of the valve housing body, is arranged concentrically with respect to the outlet valves.

Four tables 1a, 1b and 2a, 2b are shown below, showing the differences between a 5-chamber system and a 4-chamber system. In the comparison of a 4-chamber system according to Tables 1a, 1b with a 5-chamber system according to Tables 2a, 2b, significantly reduced internal operating pressures can be determined in the 5-chamber system. The arrangement of the active connections in the respective examples and comparative examples, specifically, on the one hand, for the liquid inlet and, on the other hand, for the liquid outlet, are provided in a first example and a fourth comparative example in an angle of 180° on the outside of the pump head. In a second example and a fifth comparative example, these active connections are arranged at an angle of 90° and in a third example and a sixth comparative example, on the front side (corresponds to the bottom side).

In a connection arrangement from active inlet to active outlet on the side casing wall of the pump head in a 180 degree position, a static pressure (in pascals) can be measured in the area of the casing wall inlet. side shell of 809,302 in a 4-chamber system and using water as a medium (example 1). With this connection arrangement, a speed (in mm/s) of 2,472.94 can be detected at the same measuring point in the inlet area of the side casing wall, with the measurement being carried out inside the pump head in the area input. In a 4-chamber system and using water as a medium, these values are significantly higher compared to a 5-chamber system as represented in Table 2a (comparative example 1). In the same connection arrangement, at the same measuring point and with water as medium, the static pressure in a 5-chamber system is 188.771 pascals and thus 620.531 pascals lower. The speed in comparative example 1 is 1,633.25 mm/s in a 5-chamber system, at the same measurement point and with water as medium. Therefore, the speed in a 5-camera system is almost two times lower than in a 4-camera system. Therefore, the pulsation of the liquid is significantly reduced. The pump is used more efficiently.

Another alternative connection arrangement is preferably provided with an active inlet to active outlet arrangement on the side casing wall of the pump head at a 90 degree position. The static pressure measured at the inlet area inside the pump head is 814.047 pascals in example 2 of the 4-chamber system. The speed at the same measurement point with the same water medium is 2,472.93 mm/s in this arrangement. By comparison, the static pressure of Comparative Example 2, measured in a 5-chamber system, is significantly lower at 188.375 pascals, specifically, if measured at the same measurement point and using water as the medium. The speed in a 5-camera system is also significantly lower at 1,633.25 mm/s.

Especially preferably, arranging the active inlet and outlet connections at a 180 degree angle on the side casing wall of the pump head or at a 90 degree angle does not give any difference in speed when using water as the medium. Preferably, the speed is the same.

Since the pump head can preferably have several connections for possible use as inlet and outlet, which, however, are preferably closed with a plug in case of disuse, also the inlet area inside the pump head on the wall of side casing can be measured for static pressure and velocity even if the port is not used and only the front ports are used, i.e. front inlet and front outlet. In this case, the measurement in a 4-chamber system using water as, at the point of measurement inlet zone inside the pump head on the casing side wall, without using this inlet and using the front connections, gives a value of static pressure of -237.403 pascals and a velocity value of 23.3715 of the liquid (comparative example 3). Compared to this, in Comparative Example 3, in a 5-chamber system, the static pressure value is -25.3943 and the velocity value is 27.9028. From the comparison it turns out that the static depressions in a 5-chamber system are less than in a 4-chamber system.

With reference to table 1a and the actively used connection arrangement of 180 degrees from inlet to outlet on the side casing wall (example 1), in the unused inlet area of the front port (inlet port on the bottom side) values of 704.574 pascals (static pressure) and 61.9302 mm/s can be measured. At the same measurement point, in example 2, pressure values of 714.092 and velocity values of 55.3904 result with a 90-degree positioning of the active connections inlet and outlet on the side housing wall.

Preferably using the front inlet and outlet connections (example 3), the static pressure value in the active inlet zone on the front side, measured inside the pump head, is 977.654 pascals, and the velocity value at the same point measurement is 2,472.77 mm/s. In comparison, with the same measuring arrangement and position and the same medium, namely water, the pressure value in a 5-chamber system according to Comparative Example 3 is 70.7398 pascals and the velocity value is 1,632. .43mm/sec. The pressure values and speed values in the 5-chamber system are therefore significantly lower and guarantee more efficient utilization of the pump.

In a 4-chamber system with water as the experimental medium, a static pressure of 4,912.81 pascals can be measured in the active outlet area within the pump head according to example 1 with a connection arrangement from the active inlet to the outlet active on the side casing wall in a 180 degree position. The speed with the same measurement 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 measurement position and the same medium) are 2,512.74 pascals and 135.315 mm/s. This in turn demonstrates the huge increase in efficiency of a 5-chamber system.

With the connection arrangement of an inlet to an outlet on the side casing wall in a 90-degree position according to example 2, a static pressure of 4,579.17 pascals results, measured in the active outlet area inside the pump head in a 4-chamber system using water as medium. The speed is 231.263 mm/s in this preferred experimental setup. In Comparative Example 2 of the 5-chamber system, the value of static pressure is 2,680.44 pascals and the speed value is 136.758 mm/s.

In another alternative embodiment that 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 pascals result, measured in the active outlet area inside the head pump with a 4-chamber system and with water as a medium. 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 velocity value is 136.7 mm/s.

Referring to Tables 1b and 2b, the same measurement positions and connection arrangements as in Tables 1a and 2a are represented for comparison, but using blood as medium. Also the comparison of these values clearly demonstrates the improvement of the internal static pressure and of the velocity in a 5-chamber system.

Towards the outlet chamber, the valve receiving body of the pump head preferably has five outlet valves. Preferably, the outlet chamber is centrally disposed internally relative to the inlet chambers in the valve housing body. The geometry of the chamber is preferably made by CFD analysis ("Computational Fluid Dynamics" / computational fluid dynamics) favoring the flow.

In a further preferred embodiment of the pump head according to the invention, the pump head casing is cylindrical in shape, open at the top, preferably with a lateral casing wall and a bottom which is preferably closed at the bottom, being provided to the least two connections, preferably one inlet and one outlet, horizontally and in a 90° arc on the side housing wall, particularly preferably three connections arranged horizontally and in a 90° arc on the side housing wall , as well as at least two front connections ( connections on the bottom side in the figures), preferably one input and one output.

The connections, which are preferably individually selectable as outlets and discharges, can be used variably, depending on customer requirements. They are preferably multifunctional. The pump head casing preferably has three connections, preferably two outlets and one inlet, in the lateral casing wall. The pump head casing preferably has two connections, preferably an inlet and an outlet at the bottom of the pump head casing.

Connection openings that are not needed must be closed. In a preferred embodiment, this is done with a blind closure (plug or blind plug), which closes the opening without leaking preferably by means of a snap system or, particularly preferably, a thread made without welding. In this way, a high level of tightness and long-term stability is achieved, since the sealing is carried out through a sealing collar and additional parts such as O-rings are eliminated. Since the pump head is a single-use variant, the customer can preferably close the connection only once with the blind plug. The blind plug can be mounted via a click lock and is then preferably no longer removable. Optionally, the blind plug can be mounted via a thread which is preferably made without welding and can be removed again. Therefore, the customer can choose the connections he needs for the liquid flow and then, since the pump head is of a disposable variant, close the connections that are not in use with the blind plug before commissioning. . The multifunctionality of the connections provides the customer with great flexibility in the use of the pump head.

Furthermore, the pump head according to the invention preferably comprises an overflow valve on the lower side (corresponds to the front side) to reduce overpressures due to the work or the system. The overflow valve is preferably hermetically attached to the pump head casing and allows constant flow conditions. The overflow or pressure maintenance valve reduces pressure peaks by relieving the system if the set pressure is exceeded. Advantageously, the overflow valve can be installed horizontally or vertically in the pump head casing, preferably independently of position. Therefore, it can be used in a variety of ways.

Furthermore, preferably, the overflow valve is attached to the pump head casing by means of a simple screw connection, so that it can be easily and quickly installed and removed.

In a particularly preferred embodiment, the overflow valve of the pump head according to the invention is infinitely adjustable. The setting ranges are preferably 0.2 to 6 bar, in particular 0.2 to 5 bar, and particularly preferably 0.4 to 5 bar. Preferably, the pressure maintenance valve is continuously adjustable. It can also be adapted during the pumping process, so that valve adjustment is also possible under working pressure. In this way, pressure peaks and pulsations are reliably reduced. The valve preferably has a small hysteresis. The overflow valve housing preferably consists of PP, PVDF and PTFE and thus has a high level of media resistance and meets all approval standards for the biopharmaceutical industry. With a normal internal pump pressure, the liquid or the product is preferably located in the respective part of the pump head, where during normal discharge it is led to the respective outlets. As soon as the pressure inside the pump increases, the diaphragm opens at the upper set value and rises towards the spring. In this position, a channel is preferably released which vents the pressure peak towards the pump inlet and thus provides a bypass drive. The consequence is a constant flow. The spring force can be adjusted during running operation and, due to the large diaphragm surface, can be precisely adjusted.

In a further preferred embodiment, the overflow valve is made entirely of synthetic material, the adjusting spring preferably being provided as a disk spring pack preferably made of synthetic material. Alternatively, however, the adjusting spring can also be designed as a preferably metallic ring spring, so that the valve is preferably made almost entirely of synthetic material. In the case of the all-synthetic construction, the entire pump head is metal-free. But also in the case of the annular spring made of metal, the remaining components of the overflow valve are preferably made entirely of synthetic material. The permissible temperature of the medium in relation to the valve depends on the base material. For example, if the housing is made of PVDF, a medium temperature of 120 °C is permissible, and if the housing is made of PTFE, 150 °C.

In a particularly preferred embodiment, the membrane of the pump head unit is configured in such a way that it completely covers the valve body with the pump chambers. The outer edge of the membrane is preferably configured in such a way that it protrudes above and below the surface of the membrane by only a few millimeters. The downwardly protruding diaphragm edge projection preferably engages in a correspondingly provided groove on the upper side of the outer edge of the valve housing body. The membrane surface itself preferably covers the entire inner region of the valve housing body, starting from the outer edge of the valve housing body. Thus, as usual, five diaphragms are not required, each of which is arranged individually above the pump chambers, but only one diaphragm unit can be produced cheaply and simply as a single piece and arranged in the receiving body. valve. Especially the mounting of the diaphragm in the valve housing body and in the pump head unit is thus simplified and can be carried out quickly, compared to five individual diaphragms, each of which must be individually arranged above the respective pumping chamber. This also leads to time savings in the manufacture of the pump head insert.

In another embodiment of the pump head, the diaphragm is made of a permanently elastic, especially deformable, material. Preferably, the material is synthetic material. In this way, the mobility of the membrane is excellent in terms of its suction and pressure properties.

According to another preferred embodiment of the invention, the membrane is provided with convex surfaces in the suction and pressure direction towards the respective pumping chamber (on its lower side), the convexity of which is preferably adapted to the shape and dimensions of inlet valve discs. Furthermore, particularly preferably, the diaphragm has a plurality of downwardly projecting bezels which engage in a groove which each surrounds the pump chambers on their upwardly open side. In this way, the membrane hermetically closes the respective pumping chambers. The downwardly protruding setting is preferably pear-shaped according to the respective pump chamber, the preferably pear-shaped setting engaging in a corresponding groove, preferably pear-shaped, surrounding the pumping chambers on their upwardly open side, made in the valve housing body.

In a further preferred exemplary embodiment, several, preferably five, annular bulges projecting upwards are provided on the upper side of the membrane. The inside diameter of the highest point of these annular bulges is preferably equal to the outside diameter of the downwardly bulging surfaces.

According to another preferred embodiment of the invention, in the center of the respective annular bulges of the membrane there is respectively provided a preferably plasticized pressure piece which cooperates with a pusher which is mounted on an oscillating disc of a drive unit in order to be able to put in a pumping motion. The membrane, with the pressure piece which is advantageously preferably vertically cast and which preferably defines a closing dimension of 3.5°, is constructed in such a way that optimum performance can be achieved. The preferable closing measure of 3.5° refers to the resting state of the membrane. The closing dimension can also be higher or lower, but especially between 2.0° and 6.5°. The sealing dimension refers to the convex surfaces of the diaphragm protruding downwards and the annular convolutions protruding upwards from the diaphragm. The horizontal cross-sectional line of the membrane is the starting point for dimensioning with 0°. At an angle of 3.5° are the bulges mentioned above. The angle of inclination preferably depends on the position of the eccentric shaft and can be changed individually within certain limits. In this way, the flow can be regulated, since the stroke is reduced or increased, which makes the flow variable.

Furthermore, preferably, the invention provides a diaphragm pump having a drive that it is attached to the pump head described above. Preferably, the pump head is detachably attached to the drive by means of several retaining clips or clamping tabs, preferably two retaining clips. This quick-closing mechanism is advantageous for the time-saving mounting of the replaceable pump head on the other pump elements, especially the drive. In addition, a functionally safe mounting of the pump heads is guaranteed. Disassembly is possible just as quickly as assembly of the pump head which is releasably attached to the drive housing via the retaining clips.

According to a preferred exemplary embodiment, the retaining clips are provided with a snap-fit bracket which preferably engages in a groove in the pump head. The groove is provided circumferentially in the side wall of the pump head housing, so that at the same time a great individuality in the position of the inlets and outlets of the connections is possible.

As the clamping clips close, the snap-in yoke pulls the pump head through the slot towards the impeller preferably so close that the pump head with the drive are hermetically sealed against each other.

The diaphragm pump according to the invention preferably has an electronic-hydraulic drive. By hydraulics it is possible to favor the flow of liquids.

Brief description of the drawings

In the drawings show:

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

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

Figure 3 an exploded view of the pump head insert

Figure 4 a side elevation of the pump head casing with an overflow valve

Fig. 5 a side view of the diaphragm pump with a drive and a pump head as well as an overflow valve

figure 6 a side elevation of the diaphragm pump shown in figure 5, in section along the line A-A

FIG. 7 a side view of the pump head unit with overflow valve as well as of the drive unit shown in FIG. 9, in section along the line K-K of the diaphragm pump shown in FIG. 7a

Fig. 7a a bottom view of the diaphragm pump

Figure 7b an enlarged view of the detail bordered by the circle L of fig. 7

Figure 8 a perspective view obliquely from above of the diaphragm and the valve housing body

FIG. 8a an oblique cross-sectional perspective view from below of one half of the membrane shown in FIG. 8 and the valve receiving body

figure 8b a side elevation of the membrane, in cross section

Figure 8c a side elevation of the valve housing body, in cross section

Figure 9 an exploded view of the drive unit

The diaphragm pump 2 shown in FIG. 1 consists of a drive 4 with a drive unit 3 shown in FIG. 9 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 the drive unit 3 is located. On two opposite sides of the drive housing 6, there is a retaining clip 7 (only one shown here) for fixing the drive casing 6 to a pump head casing 8. The retaining clip 7 comprises a clamping bracket 9, the end of which The inwardly arched bottom 10 engages in a groove 11 in the pump head 1. When the closing element 12 is folded up, the clamping bracket 9 pulls the pump head casing 8 firmly towards the drive casing 6. The drive unit 3 is connected to the eccentric disk 14 of the pump head unit 1 by means of a screw connection via a centering disk 13. The pump head unit 1 shown in detail in Fig. 2 consists of eccentric disc 14, pusher plate or oscillating disc 15 with five pushers 16, frame 17 with five circular frame openings 18 for receiving pushers 16, diaphragm 19, valve housing body 20 , a centering ring 21, a pump head casing 8 with several connections 22, as well as an overflow valve 5. The centering ring 21 is attached to the pump head casing 8 by means of countersunk screws 23 and center a the upper end 24 of the pump head casing 8 inside the drive casing 6.

In Figure 2, the elements of the pump head are shown in an exploded view. In this exemplary embodiment, the pump head housing 8 has a total of five openings 25 for five multifunctional connections 22, each of which can be closed with a plug 26. Two of the connection openings 25 are located on the underside (not shown). can see), three of them laterally in the casing (two of them can be seen). The overflow valve 5 is arranged on the underside in the bottom region 27 of the pump head casing 8. In this embodiment, five pump chambers 28 are arranged concentrically within the valve receiving body 20. The Five pumping chambers are pear-shaped, the round-shaped, large-volume area of the chamber being located at the outer edge of the valve-housing body and the constricted area of the chamber being located centrally within the valve-housing body. valve housing. In figure 8 the pear shape is described in more detail. Above the valve housing body 20, the diaphragm 19 is arranged. This has five annular bulges 29 around a pressure button 30 each, which face in the direction of the frame 17, sealing the respective frame openings 18 there. of its inner diameter, the annular bulges 28 descend downwards in the direction of the pressure button 30. On the underside of the membrane 19, five bulging surfaces 31 are likewise formed correspondingly (cannot be seen). These downwardly bulging surfaces 31 are described in more detail in Figure 8. The annular upward bulging 29 is clearly shown in Figure 8. In the assembled arrangement of a pump head insert 32 which is described and shown in FIG. 3, the snap button 30 cast into the membrane 19 protrudes vertically upwards through the respective frame openings 18 of the frame 17, so that the recess 33 in the pusher 16 surrounds the protruding part of the snap button. 30. Above the pusher plate 15 is the eccentric disk 14 which is screwed to the pusher plate 15 with five countersunk screws 34.

Five pumping chambers 28 are shown on the valve housing body 20. A total of five pressure pieces 30 are provided on the diaphragm 19, which protrude on the upper side of the diaphragm 19 and come into contact with the respective plungers 16 of the diaphragm. oscillating disc 15. The frames 17 have five frame openings 18, which are sealed downwards with the annular bulges 29 of the diaphragm 19. The upper part of the pressure piece 30 cast firmly into the diaphragm 19 extends into the interior of the diaphragm. frame opening 18. Eccentric disk 14 is attached to pusher plate 15 with five countersunk screws 34.

Figure 3 shows the pump head insert 32 which is made up of the eccentric disc 14, pusher plate 15, frame 17, diaphragm 19 and valve housing body 20 including gasket ring 38. In this example of embodiment, the inlet valves 35 are arranged on the outside and the outlet valves 36 are arranged on the inside. On the underside of the valve housing body 20, a sealing ring 38 is provided, which seals the outlet chamber 55 in the housing 8.

Shown in Figure 4 is the pump head casing 8 including a side elevation of the overflow valve casing 37 in Figure 4. The exploded view shows three multifunctional connections 22 arranged on the side and two connections 22 arranged on the side. bottom of the pump head casing 8. The connections 22 are each connected to a sealing ring 50 to the pump head casing 8. Four of the connections 22 are provided with a plug 26. The overflow valve 5 is arranged so decentralized shape on the underside 27 of the pump head casing 8 and fixed to the casing 8 by means of a screw connection.

Figure 5 shows a side elevation of the diaphragm pump 2. Two side connections 22 can be seen on the pump head casing 8 and two connections 22 (closely shown in perspective being offset from one another) on the bottom side 27 of the pump head casing 8. The overflow valve 5 is located decentrally on the underside 27 of the pump head casing 8. The retaining bracket 9, shown in the drawing, of the retaining clip or of the fastening tongue 7 engages in a groove 11 of the pump head casing 8, which circumferentially surrounds the side wall of the casing 8, and fixes the pump head casing 8 with respect to the drive 4. The closing lever 12 of the staple 7 is in the closed state.

Figure 6 shows a side elevation in longitudinal section AA of the diaphragm pump 2 shown in Figure 5. The flange 39 of the yoke 40 of the drive 4 is fixed to the drive casing 6 with several cylinder head bolts 41. lower side of the drive 4 is fixed by means of retaining clips 7 the head of the pump 1. The lower end 10 of the clamping bracket 9 of the retaining clips 7 engages in the laterally circumferential groove 11 of the pump head casing 8. The pump connections 22 are connected to the joint ring 50 towards the pump casing. pump head 8. The valve housing body 20 is housed with the diaphragm 19 and the frame 17 in its entirety in the pump head casing 8, the centering ring 21 functioning as an interface between the pump head casing 8 and drive casing 6. Eccentric disc 14 protrudes into drive casing 6.

In FIG. 7, the pump head 1 with drive unit 3 without cylinder head 40 is shown in a sectional side elevation along line K-K of the diaphragm pump 2 shown in FIG. 7a. Cam 42 extends, through the opening in the upper side of motor housing 6, into motor compartment 43. Drive unit elements 3 together with ball bearings 43, 44 can be seen , being represented in detail in figure 9. A membrane 45 of the overflow valve 5 is shown together with the spring 46 in the valve 5.

Figure 7b is an enlarged view of the overflow valve 5, according to the enlargement L of Figure 7. The overflow valve 5 is arranged on the lower side 27 of the pump head casing 8. The membrane 45 seals an outlet 47 and an inlet 48 to the liquid chamber 49 of the pump head 1. The spring 46 is arranged below the diaphragm 45 in the valve housing 37. When a high internal pressure of the pump is reached, the diaphragm 45 collapses. opens and rises towards the spring 46. In this way, a channel or annular channel 51 is freed which evacuates the pressure peak towards the inlet 48 of pump 2. In this way, a constant flow rate can be maintained in pump 2 .

Fig. 8 shows an exploded view of the membrane 19 and the valve housing body 20. Three of the five pumping chambers 28 of the valve housing body 20 can be clearly seen in a plan view obliquely from above. The pumping chamber designated directly by the reference sign 28 in figure 8, has a kind of pear shape. The large volume area of the pyriform chamber is disposed at the outer edge of the valve housing body. Towards the center of the valve housing body, the pumping chamber then tapers so that it is pear-shaped. One side joining the high volume area to the tip of the pumping chamber narrowing runs straight (it is the side marked by the reference line of the reference sign 28) and the opposite side is slightly curved inwards at its center, between the lower end of the high-volume zone at the outer edge and the upper end of the tapered zone. Adjacent to this slightly inwardly curving central point of the pumping chamber designated directly by reference numeral 28 in Figure 8 is the upper end of the narrowing of the pumping chamber which can be seen in its entirety in Figure 8. Five annular bulges 29 of the diaphragm 19 can be seen, which circumferentially surround the respective pressure piece 30 arranged centrally within the respective bulge 29 and protrude upwards. Also a pear-shaped or pear-shaped groove 52, which borders the individual pump chambers 28 on their upwardly open side within the valve housing body 20, can be clearly seen in the case of three pump chambers 28. In this groove 52 engages the corresponding pear-shaped bezel 53 which is provided on the underside (cannot be seen here) of the diaphragm 19.

Figure 8a shows a sectional view through the membrane 19 shown in Figure 8 and the valve housing body 20. On the underside 54 of the valve housing body 20 is shown the outlet chamber 55 in which outlet valves 36 (three can be seen here) open out. The outlet valves 36 are preferably configured as diaphragm valves. An outlet valve 36 is shown in section. An inlet valve 35 is also shown in section, an inlet chamber 56 being arranged respectively on the lower side 54 of the valve housing body 20 in front of the inlet valves 35 (three can be seen here). Preferably, the inlet valves 35 are likewise designed as a diaphragm valve. The preassembled pressure piece 30 is cast (plasticized) and is fixedly attached to the membrane 19. On the underside 57 of the membrane 19, one of the multiple pear-shaped seams 53 of the membrane 19 protruding from the surface is shown in its entirety. membrane 58 down. The outer rim 59 of the membrane has projections 59', 59'' projecting up and down from the membrane surface 58 and surrounding the outer edge 59 of the membrane. The projection 59' protruding downwards from the diaphragm rim 59 is designed in such a way that it can engage in a correspondingly formed groove 60 in the valve housing body 20 and provided on the upper side of the outer rim of the housing body. valve housing 20. The groove 60 which is provided on the upper side of the outer rim of the valve housing body 20 is shown in Fig. 8a.

Figure 8b shows the membrane 19 in cross section and in a state of rest. The pressure piece 30, which is cast into the membrane 19 and defines the closing dimension, is in the rest state. In this exemplary embodiment, it defines a displayed closure dimension of 3.5 degrees. The annular bulge 28 visible in the region of the outer edge of the membrane 19 protrudes upwards at an angle of 3.5 degrees from the horizontal surface of the membrane 58 (=0°).

Figure 8c shows the valve housing body 20, which in the lower area has an outlet chamber 55 and several inlet chambers 56 (one is shown here). A valve is also represented in section. inlet 35 and an outlet valve 36.

Figure 9 shows an exploded view of the drive unit 3. This comprises several drive elements. These include the eccentric 42, several circlips 61, 61', two ball bearings 43, 44, the centering disk 13 and a bearing pressure disk 63 which is fixed to the eccentric 42 with a countersunk screw 64.

List of reference signs

1 Unit of pump head / pump head

2 Diaphragm pump/ pump

3 drive unit

4 Drive

5 Overflow valve / valve

6 Drive or motor housing

7 Retaining clip / clip / tensioning tab

8 Pump head casing / casing

9 Clamping bracket

10 Inwardly curved lower end of clamping bracket

11 slot

12 Closing element / clamp closing lever

13 Centering disc

14 eccentric disc

15 Cleat plate or wobble disk

16 plunger

17 frame

18 Frame opening

19 membrane

20 Valve Housing Body

21 Centering ring

22 Connections / pump connections

23 Countersunk Screws

24 Upper end of pumphead casing

25 Opening in pump head casing

26 Stopper

27 Bottom or underside of pumphead casing

28 pumping chamber

29 Annular bulge

30 Pressure button / pressure piece

31 Convex surface

32 Pump head insert

33 pusher recess

34 Countersunk Screws

35 Inlet valves

36 outlet valves

37 Overflow valve housing / valve housing

38 ring seal

39 flange

40 cylinder head

41 cylinder head bolts

42 Eccentric

43 Lower Ball Bearing

44 upper ball bearing

45 Overflow valve membrane

46 Spring

47 Exit

48 Inlet / Flow Inlet

49 Liquid Chamber

50 ring seal

51 channel

52 Piriformis groove

53 Pyriform setting

54 Lower side of valve housing body

55 exit chamber

56 entrance chamber

57 Underside of membrane

Membrane surface Outer rim of membrane ' Downward protruding protrusion " Upward protruding protrusion

Groove

, 61' Safety Rings

Bearing Pressure Disc Countersunk Screw

Claims (18)

1. Pump head (1) for diaphragm pumps (2), comprising a pump head casing (8) with various connections (22) that are made in the pump head casing (8) providing both inlets and outlets, a centering ring (21) for centering the pump head casing (8) within a drive casing (6), and a pump head insert (32) comprising a valve housing body (20) with several inlet and outlet valves (35, 36) and several pumping chambers (28), the pumping chambers (28) being connected to an inlet chamber (56) through the inlet valves (35) and to an outlet chamber (55) via the outlet valves (36), and the pumping chambers (28) being made on the upper side within the valve housing body (20) , a pumping membrane (19) that is arranged above the pumping chambers (28) of the valve housing body (20) sealing them without leaks, an oscillating disc (15), an eccentric disk (14) which is disposed above the oscillating disk (15) and a frame (17) with several preferably circular frame openings (18) for accommodating several pushers (16) which are arranged on the underside of the oscillating disk (15), the pump head (1) being made separately from a drive (4) and can therefore be replaced individually, characterized by what the pump head forms a self-tight unit, the valve receiving body (20) having five pump chambers (28) with at least one inlet valve (35) each, and the pump head being made of pump (1) made of synthetic material and being recyclable. 2. Pump head (1) according to claim 1, characterized by what the valve housing body (20) presents towards the outlet chamber (55) five outlet valves (36). 3. Pump head (1) according to claim 1, characterized by what the pump head casing (8) is preferably cylindrical in shape and open at the top, with a lateral casing wall and a bottom (27) closed at the bottom and at least two connections (22), preferably an inlet and an outlet , on the side casing wall, as well as at least two connections (22), preferably one inlet and one outlet, on the underside (27) of the pump head casing. 4. Pump head (1) according to claim 1, characterized by what the connections (22) are individually replaceable and are preferably made as multifunctional connections. 5. Pump head (1) according to claim 1, characterized by what the connections (22) that are out of service can be closed without leaks with a plug (26), preferably a blind plug. 6. Pump head (1) according to claim 1, characterized by what The pump head casing (8) preferably has an overflow valve (5) on the underside (27) to reduce overpressure due to work or the system, which is hermetically connected to the pump head casing (8). . 7. Pump head (1) according to claim 6, characterized by what the overflow valve (5) is fixed to the pump head casing (8) by means of a screw connection. 8. Pump head (1) according to claim 6 or 7 characterized by what the overflow valve (5) can be adjusted continuously, preferably during the pumping process under a working pressure of 0.2 to 6 bar, especially 0.2 to 5 bar, particularly preferably 0.4 to 5 bars. Pump head (1) according to one of claims 6, 7 or 8, characterized by what The adjusting spring (46) of the overflow valve (5) is designed as an annular spring or as a package of disc springs, preferably made of metal or synthetic material. Pump head (1) according to one of claims 6, 7 or 8, characterized by what the overflow valve (5) is made of synthetic material. 11. Pump head (1) according to claim 1, characterized by what the membrane (19) completely covers the valve housing body (20) with the pumping chambers (28). 12. Pump head (1) according to claim 1, characterized by what the membrane (19) is made of a permanently elastic, particularly deformable, synthetic material. 13. Pump head (1) according to claim 1, characterized by what the diaphragm (19) has curved surfaces (31) in the suction and pressure direction towards the respective pumping chamber (28), which are adapted to the shape and dimensions of the inlet valve discs, and the diaphragm has a number of preferably pear-shaped inserts (53) protruding downwards, which engage in a preferably pear-shaped groove (52) bordering the individual pump chambers (28) on their upwardly open side in the valve housing body (20), closing the pumping chambers (28) hermetically. 14. Pump head (1) according to claim 1, characterized by what On its upper side, the membrane (19) has several, preferably five, annular bulges (29), the inside diameter of which at the highest point of the annular bulge (29) is equal to the outside diameter of the downwardly bulging surfaces (31). 15. Pump head (1) according to claim 14, characterized by what In the center of the annular bulges (29), a preferably plastic-coated pressure piece (30) is provided in each of them, which cooperates with a pusher (16) which is arranged on an oscillating disc (15) of a drive unit ( 3), to be put into a pumping motion. 16. Diaphragm pump (2) formed by a pump head (1), according to at least one of the preceding claims, connected to a drive (4), characterized by what the drive (4) comprises a drive unit (3) arranged within a drive casing (6), the pump head (1) being detachably attached to the drive (4) by means of several, preferably two, clips (7) which are arranged on opposite lateral housing surfaces of the drive housing (6). 17. Diaphragm pump (2) according to claim 16, characterized by what the multiple, preferably two, fastening clips (7) are provided with a snap-fit bracket (9) that engages in a groove (11) in the pump head (1), in such a way that when the fastening clips close (7), the snap-fit bracket (9) pulls the pump head (1) closer to the drive (4) sealing it with the drive (4). 18. Diaphragm pump (2) according to claim 16, characterized by what It has an electronic hydraulic drive (4) and works without pulsations.