Modular powder pump

Abstract

The invention relates to a pump head module (2) for a dense phase powder pump (1), wherein the pump head module (2) has at least one powder conveying chamber (40) which is or can be fluidically connected to a first powder reservoir via a powder inlet (3) and to a second powder reservoir or to a powder spraying device via a powder outlet (4). According to the invention, the pump head module (2) is of modular construction and has the following individually replaceable or exchangeable components: a powder inlet module block (20); a first pinch valve module block (21) which is detachably connected to the powder inlet module block (20); a first filter module block (22) which is detachably connected to the first pinch valve module block (21); a second pinch valve module block (21) which is detachably connected to the first filter module block (22); a second filter module block (22) which is detachably connected to the second pinch valve module block (21); and a powder outlet module block (23) which is detachably connected to the second filter module block (22).

Description

[0001] MODULAR POWDER PUMP

[0002] Description

[0003] The present invention relates generally to dense phase powder pumps for conveying coating powder.

[0004] Dense-phase powder pumps of the type considered here have at least one conveying chamber equipped with a powder inlet valve and a powder outlet valve. The conveying chamber can be connected alternatively to a vacuum source during a suction phase or to a transport compressed air source during a discharge phase. Using the vacuum from the vacuum source, powder is sucked into the conveying chamber through the open powder inlet valve while the powder outlet valve is closed. Using the transport compressed air from the transport compressed air source, the powder in the conveying chamber is discharged through the open powder outlet valve while the powder inlet valve is closed.

[0005] Dense phase powder pumps can have several conveying chambers arranged parallel to one another, which operate in phases such that coating powder is alternately sucked into one conveying chamber while coating powder is discharged from the other conveying chamber.

[0006] For example, EP 1 551 558 A1 relates to a dense phase powder pump having a first powder feed chamber and a second powder feed chamber arranged parallel to the first powder feed chamber. The two powder feed chambers of the dense phase powder pump known from this prior art are each delimited on both the intake and discharge sides by a mechanically actuated pinch valve arrangement. Specifically, it is provided that, in the intake and discharge areas of the dense phase powder pump, the powder hoses connected to the respective powder feed chambers of the dense phase powder pump can be deformed by a mechanically actuated plunger in order to pinch off or open the hose section as needed.

[0007] Each powder feed chamber of the dense phase powder pump known from this prior art is assigned a filter tube which delimits the circumference of the corresponding powder feed chamber. The filter tube is permeable to air, but not to coating powder, and is surrounded by an annular chamber to which either negative pressure or compressed air can be connected. This allows coating powder to be alternately sucked into each powder feed chamber or expelled from the corresponding powder feed chamber using compressed air. The two powder feed chambers arranged parallel to each other are operated in alternating phases, which means that one of the two powder feed chambers sucks in coating powder through the powder inlet of the dense phase powder pump, while the other of the two powder feed chambers discharges a portion of coating powder previously sucked into the powder feed chamber via the powder outlet of the dense phase powder pump.

[0008] The use of dense phase powder pumps for conveying coating powder to corresponding devices for spraying coating powder, such as in particular powder spray coating guns, is known from the document DE 196 11 533 B4, the document WO 2004 / 087331 A1 and the document EP 1 566 352 A2.

[0009] Before the use of dense phase powder pumps of the type considered here for conveying coating powder became known, powder pumps designed as injectors were used, and these are still used today to convey coating powder. In contrast to dense phase powder pumps, however, powder pumps designed as injectors (dilute phase powder pumps) have the disadvantage that powder pumps designed as injectors typically wear out relatively quickly and can convey a decreasing amount of coating powder per unit of time over time. Therefore, dense phase powder pumps have become established in practice, particularly for applications where a relatively constant amount of coating powder must be conveyed per unit of time.

[0010] In practical use, however, it has been shown that dense phase powder pumps, such as those known from the document EP 1 551 558 A1, have problems with continuous powder conveyance, particularly with some types of powder, or that they require relatively frequent maintenance.

[0011] The dense phase powder pumps generally known from the prior art and described above therefore have the particular disadvantage that they can only be maintained with relatively high expenditures. In particular, the maintenance of the pneumatically controlled components of the dense phase powder pump, which come into contact with coating material during operation of the dense phase powder pump, is relatively complex. On the other hand, the quality of powder delivery is largely determined by the proper functioning of the corresponding pneumatically controlled / controllable components of the dense phase powder pump.

[0012] Since the maintenance / replacement of pneumatically controlled / controllable components of the dense phase powder pump of a conventional dense phase powder pump is relatively time-consuming and labor-intensive, this is often only carried out with a delay, which can ultimately have a negative impact on the efficiency and coating quality of a powder spraying device (spray gun) supplied with coating powder by the dense phase powder pump.

[0013] The invention is therefore intended to achieve the general object of developing a dense phase powder pump of the type mentioned at the outset in such a way that it or components of the dense phase powder pump can be replaced or maintained as easily as possible, in order to ensure that the best possible result with regard to the efficiency and / or the conveying quality of the dense phase powder pump can be guaranteed without extended downtimes of the dense phase powder pump. In particular, on the basis of the problems described above, a dense phase powder pump is to be specified wherein the dense phase powder pump can be maintained with relatively little effort and wherein the individual pneumatically controlled or controllable components of the dense phase powder pump can be replaced in an easy-to-implement manner without the risk of impairing the functioning of the dense phase powder pump.

[0014] The invention is intended in particular to solve the problem of simplifying the maintenance of a dense phase powder pump in order to reduce potential downtimes of the dense phase powder pump.

[0015] The object underlying the invention is achieved in particular by a dense phase powder pump with a pump head module according to independent patent claim 1, wherein advantageous developments of the invention are specified in the dependent patent claims.

[0016] The invention also relates to a corresponding pump head module of a dense phase powder pump, as specified in the independent claim 21.

[0017] Accordingly, the invention relates in particular to a pump head module of a dense phase powder pump for conveying coating powder from a powder reservoir to a powder spraying device, wherein the pump head module is or can be detachably connected via a connection block to a compressed air control module of the dense phase powder pump.

[0018] By providing such a pump head module, a particularly compact design of a dense phase powder pump can be realized, whereby due to the modular design of the dense phase powder pump, it can be easily disassembled, for example for the purpose of servicing components of the dense phase powder pump or for replacing components of the pump.

[0019] The modular design of the dense phase powder pump with the pump head module also offers the advantage of reducing sealing problems between the interfaces of the dense phase powder pump's components or modules. The pump head module of the invention is preferably also modular in design and, in particular, comprises the following individually replaceable or interchangeable components:

[0020] - a powder inlet module block;

[0021] - a first pinch valve module block with a pinch valve inlet, which is or can be detachably connected to an outlet region of the powder inlet module block via a plug connection, in particular via a bayonet lock;

[0022] - a first filter module block with an inlet area which is or can be detachably connected to a pinch valve outlet area of ​​the first pinch valve module block via a plug connection, in particular via a bayonet closure;

[0023] - a second pinch valve module block with a pinch valve inlet area which is or can be detachably connected to an outlet area of ​​the first filter module block via a plug connection, in particular via a bayonet lock;

[0024] - a second filter module block with an inlet area which is detachably connected or connectable via a plug connection, in particular via a bayonet lock, to a pinch valve outlet area of ​​the second pinch valve module block; and

[0025] - a powder outlet module block with an inlet area which is or can be detachably connected to an outlet area of ​​the second filter module block via a plug connection, in particular via a bayonet lock.

[0026] In other words, the individual module blocks of the pump head module are detachably connected to one another via a plug-in connection, in particular a bayonet lock. This allows for easy replacement of the individual module blocks, for example, for maintenance or replacement purposes.

[0027] The pump head module preferably has a housing shell that can be detachably connected, in particular via a quick-change system, to the connection block of the dense phase powder pump and is designed to accommodate the module blocks of the pump head module at least partially or in regions when the module blocks are in their interconnected state. The individual module blocks of the pump head module are each designed as plastic parts, in particular as plastic injection-molded parts. This allows the weight of the pump head module to be reduced. At the same time, the manufacturing costs of the individual module blocks of the pump head module are reduced.

[0028] According to preferred embodiments of the present invention, the powder inlet module block has an inlet area that can be connected via a plug connection, in particular via a bayonet lock, either to a connection piece for manual operation of the dense phase powder pump or to a connection piece for automatic operation of the dense phase powder pump. The connection piece for manual operation of the dense phase powder pump preferably runs straight, while the connection piece for automatic operation of the dense phase powder pump runs at an angle.

[0029] Alternatively, it is conceivable that the powder inlet module block is either a powder inlet module block with an inlet area that is connected or connectable via a plug connection, in particular via a bayonet lock, to a connection piece for manual operation of the dense phase powder pump, or a powder inlet module block with an angled inlet area for automatic operation of the dense phase powder pump.

[0030] In this way, the powder dense phase pump can be individually and easily converted for either automatic or manual operation.

[0031] With regard to the modular design of the pump head module, it is particularly preferred that each plug connection of the individual module blocks of the pump head module is formed by corresponding connecting parts of the module blocks to be connected to one another. The connecting parts are preferably designed such that, when the plug connection is established, the module blocks to be connected to one another are aligned to one another, particularly by positive locking.

[0032] In this context, it is particularly advisable for the connecting parts to be designed according to the poka-yoke principle, so that the connecting parts can only form a plug-in connection between predefined module blocks. This measure, in a simple yet effective way, prevents the individual module blocks of the pump head module from being connected incorrectly, for example, in the wrong order.

[0033] Preferably, the first and second pinch valve module blocks are identical or at least substantially identical and each form a pinch valve housing in which a pinch valve designed as a cartridge-like component is or can be exchangeably received.

[0034] In this context, it is advisable for the pinch valve to have a valve element that is at least partially tubular, the peripheral wall of which can be squeezed transversely to the longitudinal axis of the valve element in order to change the flow cross-section of the pinch valve.

[0035] Furthermore, the pinch valve has a preferably at least substantially tubular support structure in which the valve element is at least partially accommodated. The support structure consists of a plurality of shell elements arranged in a row around the circumferential wall of the valve element in the circumferential direction, each having an arcuate cross-section, which are attached to the outside of the valve element in a radial direction relative to the longitudinal axis of the valve element.

[0036] Providing such a support structure ensures that the valve element can be easily installed without compromising its support. When assembled, the pinch valve forms a cartridge-like unit, eliminating the need for laborious insertion of the valve element into a support structure. Instead, the individual shell elements of the support structure can be attached to the tubular valve element from the outside radially, thus forming the circumferentially segmented support structure.

[0037] It is still possible to insert the cartridge-like assembly, consisting of the shell elements and the valve element, axially into a valve housing, in particular into the pinch valve housing of the corresponding (first / second) pinch valve module blocks of the pump head module. If necessary, the cartridge-like assembly can of course also be removed from the pinch valve housing.

[0038] The segmentation of the support structure with detachable attachment of the shell elements also has the advantage that a worn valve element can be easily replaced, while the shell elements are reusable.

[0039] In particular, it is thus provided that the shell elements of the support structure of the pinch valve are or can be connected to one another, preferably detachably, via a locking or snap connection.

[0040] According to embodiments of the pump head module according to the invention, the support structure of the pinch valve consists of exactly two shell elements, each with an arc extension of 180°. These are, in particular, identical or at least essentially identical components, thus enabling cost-effective production.

[0041] The two shell elements preferably have at least one first locking means and at least one second locking means complementary to the first locking means, via which the two shell elements can be positively and particularly releasably connected to form the support structure. As already indicated, the locking means are, in particular, locking means that enable the formation of a clip connection.

[0042] In a further development of the latter aspect, the at least one first locking means and the at least one second locking means are configured on the two shell elements in such a way that the two shell elements can only be connected to one another in a predetermined orientation. This arrangement of the at least one first locking means and the at least one second locking means provides a means for immediate error detection or error prevention, particularly according to the poka-yoke principle.

[0043] Preferably, in the pinch valve of the pump head module according to the invention, it is provided that, at least in a connected state of the shell elements of the support structure of the pinch valve, at least one and preferably two mutually opposite slotted openings are formed in the support structure, extending in the longitudinal direction of the support structure, through which compressed air can act as a squeezing means on the peripheral wall of the valve element in order to squeeze the peripheral wall of the valve element together to reduce the available flow cross-section.

[0044] According to implementations, it is provided that the at least one preferably slot-shaped opening is formed in a region between the two shell elements during assembly of the cartridge-like structural unit.

[0045] The invention further relates to a corresponding pinch valve as defined in the independent claim 22.

[0046] The pinch valve according to the invention is particularly suitable for a pinch valve module block of a pump head module for a dense phase powder pump of the aforementioned type according to the invention. The pinch valve module block forms a pinch valve housing in which the pinch valve, designed as a cartridge-like component, is replaceably accommodated or can be accommodated. The pinch valve has a valve element that is at least partially tubular, the peripheral wall of which can be squeezed transversely to the longitudinal axis of the valve element in order to change the flow cross-section of the pinch valve.

[0047] Furthermore, the pinch valve has a preferably at least substantially tubular support structure in which the valve element is at least partially received, wherein the support structure consists of a plurality of shell elements arranged in a row around the circumferential wall of the valve element in the circumferential direction of the circumferential wall, each having an arcuate cross-section, which are attached to the outside of the valve element in a radial direction with respect to the longitudinal axis of the valve element.

[0048] According to further developments of the pinch valve according to the invention, it is provided that the shell elements of the support structure of the pinch valve are or can be connected to one another, preferably detachably, via a locking or snap connection.

[0049] Alternatively or additionally, it is conceivable that, at least in the interconnected state of the shell elements of the support structure of the pinch valve, at least one and preferably two mutually opposite slotted openings extending in the longitudinal direction of the support structure are formed in the support structure, wherein the at least one slotted opening extending in the longitudinal direction of the support structure is formed at least in regions between two mutually adjacent shell elements of the support structure of the pinch valve.

[0050] With regard to the filter module blocks of the pump head module of the present invention, it is preferably provided that the two filter module blocks of the pump head module are identical or at least substantially identical and each form a filter housing in which a filter element designed as a cartridge-like component is or can be exchangeably received.

[0051] The cartridge-type filter element comprises a hollow cylindrical filter made of a material that is permeable to air but impermeable to coating powder. This material can be, for example, a polyethylene material or a sintered material.

[0052] The cartridge-like filter element further comprises a preferably at least substantially tubular support structure, in which the filter is at least partially accommodated. A plurality of window or opening areas, preferably arranged equidistantly, are formed in a lateral surface of the support structure. Compressed air introduced into the filter housing of the corresponding filter module block can be applied through the window areas through the hollow cylindrical filter into the interior of the filter, or a corresponding negative pressure can be applied.

[0053] A connection cap is preferably arranged at the respective end regions of the support structure. The connection cap is preferably permanently connected to the support structure of the filter element and, in particular, is welded.

[0054] According to preferred realizations of the cartridge-like or cartridge-like filter element, it is provided that the length of the support structure of the filter element is shorter than the length of the filter, so that in a state when the filter is at least partially received in the support structure, an end region of the filter protrudes from the end region of the support structure.

[0055] In particular, it is provided that the connection cap has a nozzle-shaped portion adapted to the length and external shape of the end portion of the filter protruding from the end portion of the support structure, which nozzle-shaped portion receives the end portion of the filter protruding from the end portion of the support structure. An annular inner stop is formed on the free end portion of the nozzle-shaped portion opposite the support structure of the filter element, against which the end face of the filter abuts or against which the end face of the filter rests.

[0056] In particular, an outer diameter of the nozzle-shaped region is larger than the outer diameter of the support structure of the filter element, at least in a section of the nozzle-shaped region.

[0057] A through-opening is formed in the nozzle-shaped region, which extends in the longitudinal direction of the filter element and is designed concentrically and / or coaxially with the hollow cylindrical filter. The diameter of the through-opening corresponds at least substantially to the inner diameter of the hollow cylindrical filter.

[0058] Preferably, a seal, in particular in the form of an annular sealing lip, which extends at least partially or regionally in the longitudinal direction of the filter element, is formed on the free end region of the nozzle-shaped region opposite the support structure.

[0059] It is advisable for the nozzle-shaped area to be designed as a monolithic plastic part, in particular a 2K plastic injection-molded part, and to have a soft plastic component and a hard plastic component, wherein at least the seal is preferably formed partially or regionally by the soft plastic component.

[0060] The invention further relates to such a cartridge-like filter element for a pump head module and to a pinch valve designed as a cartridge-like component for a pump head module.

[0061] Finally, the invention relates to a dense phase powder pump with a pump head module.

[0062] The dense-phase powder pump is used to convey coating powder from a first powder reservoir to a second powder reservoir or to a powder spray device. The dense-phase powder pump is characterized by its modular design and comprises at least the following components, each designed as a module: a pump head module having at least one powder conveying chamber that is or can be fluidly connected to the first powder reservoir via a powder inlet and to the second powder reservoir or to the powder spray device via a powder outlet; and a compressed air control module having a plurality of switching valves that are assigned, in particular, to pneumatically controllable components of the pump head module and are designed to supply the pneumatically controllable components of the pump head module with compressed air, suction air, or vacuum as needed, in particular in a controlled manner.

[0063] In particular, in this context, it is provided that the pump head module is detachably connected or connectable to the compressed air control module via a quick-change module of the dense phase powder pump designed as a connection block, in particular such that, when the pump head module is connected to the compressed air control module, the pneumatically controllable components of the pump head module are fluidly connected to the switching valves of the compressed air control module via the quick-change module designed as a connection block. The invention is described in more detail below with reference to the accompanying drawings.

[0064] The invention is described in more detail below with reference to the accompanying drawings.

[0065] They show:

[0066] FIG. 1 shows schematically and in an isometric view an exemplary embodiment of the dense phase powder pump according to the invention;

[0067] FIG. 2 shows schematically and in an isometric partial exploded view the exemplary embodiment of the dense phase powder pump according to the invention according to FIG. 1;

[0068] FIG. 3 shows schematically and in a side view a partially exploded view of the exemplary embodiment of the dense phase powder pump according to the invention;

[0069] FIG. 4 shows schematically and in an isometric exploded view the modular pump head module of the exemplary embodiment of the dense phase powder pump according to the invention as shown in FIG. 1;

[0070] FIG. 5a shows a schematic and isometric view of the powder outlet module block of the modular pump head module of the exemplary embodiment of the dense phase powder pump according to the invention as shown in FIG. 1;

[0071] FIG. 5b shows a schematic and isometric exploded view of the powder outlet module block according to FIG. 5a;

[0072] FIG. 6 shows a schematic and isometric view of the modular pump head module of the exemplary embodiment of the dense phase powder pump according to the invention, specifically with a powder inlet module block and a powder outlet module block; FIG. 7 shows a schematic and isometric exploded view of the modular pump head module according to FIG. 6;

[0073] FIG. 8 shows schematically and in an isometric exploded view an exemplary embodiment of a cartridge-like filter element for a filter module block of the pump head module according to FIG. 4 or FIG. 7;

[0074] FIG. 9 schematically and in an isometric exploded view, an exemplary embodiment of a cartridge-type pinch valve for a pinch valve module block of the pump head module according to FIG. 4 or FIG. 7; and

[0075] FIG. 10 schematically shows a pneumatic diagram of the exemplary embodiment of the dense phase powder pump according to the invention as shown in FIG. 1.

[0076] The exemplary embodiment of the dense phase powder pump 1 according to the invention, shown schematically in particular in FIG. 1 and FIG. 2, is characterized by its modularity, as can be seen in particular from the schematic and isometric exploded view according to FIG. 2.

[0077] In particular, the powder dense phase pump 1 according to the invention is constructed according to the modular principle and divided into different functional components which are also constructed in a modular manner.

[0078] This is in particular a pump head module 2 which - as can be seen from the pneumatic diagram according to FIG. 10 - has at least one powder conveying chamber 40 which is or can be fluidly connected via a powder inlet 3 to a (first) powder reservoir and via a powder outlet 4 to a (second) powder reservoir or to a powder spraying device (in particular a powder spray gun) not shown in the drawings.

[0079] The pump head module 2 of the dense phase powder pump 1 is preferably operatively connected, in particular fluidically, to a compressed air control module 5 of the dense phase powder pump 1 via a quick-change system or a quick-change module 30. The compressed air control module 5 forms an application valve unit for the pump head module 2.

[0080] The compressed air control module 5 is integrated or can be integrated at least partially or regionally in a pump housing 31, wherein the pump housing 31 further preferably has a control unit for controlling the controllable components of the dense phase powder pump 1.

[0081] The quick-change system or quick-change module 30, via which the pump head module 2 is connected to the compressed air control module 5 serving as an application valve unit, is designed in particular as a connection block.

[0082] The exploded view according to FIG. 2 also shows that a further module of the dense phase powder pump 1 is formed by a connection module 32.

[0083] The connection module 32 of the dense phase powder pump 1 can, in particular, have an HMI interface 33. The HMI interface 33 can preferably be designed in the form of a display or can have a corresponding display.

[0084] In addition, the connection module 32, which is at least partially or regionally accommodated in the pump housing 31 and / or carried by the pump housing 31, comprises corresponding connections 34 for connecting at least one signal and / or data and / or control line and at least one power supply line.

[0085] In addition, the connection module 32 according to the embodiment shown has a signal and / or data and / or control line connection 35, which can be connected to a powder spraying device (in particular to a powder spray gun) for data or signal transmission via a corresponding signal / data / control line.

[0086] As can be seen from the exploded view in FIG. 2, the connection module 32 can further comprise at least one digital position controller 36. However, the invention is not limited to embodiments in which the at least one digital position controller 36 is part of the connection module 32. Rather, it is also conceivable in this context that the at least one digital position controller 36—detached from the connection module 32—is accommodated or receivable in a base body of the pump housing 31.

[0087] The pump housing 31 of the dense phase powder pump 1 according to the invention, which is shown in the form of an exemplary embodiment in FIG. 1 to FIG. 3, is particularly designed to accommodate at least partially or regionally the compressed air control module 5 and an inlet valve unit module 37 and to detachably connect these modules 5, 37 to one another.

[0088] In particular, it is provided that the pump housing 31 of the dense phase powder pump 1 is designed to supply the compressed air received via a main compressed air connection 38 of the input valve unit module 37, in a state in which the compressed air control module 5 and the input valve unit module 37 are accommodated in the pump housing 31, in particular as required, to a plurality of switching valves of the compressed air control module 5.

[0089] The pump head module 2 comprises all components of the dense phase powder pump 1 necessary for the pneumatic conveying of coating powder. These are, in particular, pneumatically controlled components that are arranged one behind the other and fluidly connected to each other.

[0090] In detail, the individually replaceable or interchangeable components of the pump head module 2 are, for example, a powder inlet module block 20, a first pinch valve module block 21 with a pinch valve inlet, which is detachably connected or connectable via a plug connection to an outlet region of the powder inlet module block 20, a first filter module block 22 with an inlet region, which is detachably connected or connectable via a plug connection to a pinch valve outlet region of the first pinch valve module block 21, a second pinch valve module block 21 with a pinch valve inlet region, which is detachably connected or connectable via a plug connection to an outlet region of the first filter module block 22, a second filter module block 22 with an inlet region, which is detachably connected or connectable via a plug connection to a pinch valve outlet region of the second pinch valve module block 21 can be connected,and a powder outlet module block 23 with an inlet area which is detachably connected or connectable to an outlet area of ​​the second filter module block 22 via a plug connection.

[0091] In particular, the first and second pinch valve module blocks 21 are designed identically to one another.

[0092] The first pinch valve module block 21 functionally forms a powder inlet-side pinch valve with respect to the first filter module block 22, while the second pinch valve module block 21 functionally forms a powder outlet-side pinch valve with respect to the first filter module block 22.

[0093] Likewise, the first and second filter module blocks 22 are designed identically to one another. In functional terms, the first filter module block 22 forms a powder conveying chamber 40 of the dense phase powder pump 1, while the second filter module block 22 serves in particular as an additional compressed air inlet device 39.

[0094] In particular, the individual functional components of the pump head module 2 are each designed in a modular manner, ie as module blocks, which can be connected to one another via corresponding plug connections.

[0095] Accordingly, the pump head module 2 is constructed according to a modular principle, with the functional components of the dense phase powder pump 1 being divided into modules or assemblies. The individual modules or assemblies of the pump head module 2, constructed according to the modular principle, can be combined or integrated via appropriate interfaces if their shape and function are suitable.

[0096] The advantage of such a modular pump head module 2, constructed according to the modular principle, is, on the one hand, increased flexibility in product and organizational development. Faster product cycles and greater adaptability are possible, for example, to adapt the pump head module 2 or the dense phase powder pump 1 to new conditions. On the other hand, the modular design of the pump head module 2 offers the further advantage of allowing a wide product variety to be realized in a simple manner.

[0097] Apart from this, cost-effective production is possible due to identical series and simpler assembly processes.

[0098] Finally, the modular design of the pump head module 2 also offers advantages with regard to the maintenance of the pump head module 2, as cost-effective repair is possible by replacing the faulty components of the pump head module 2.

[0099] The filter module block 22 forms a powder conveying chamber 40 of the dense phase powder pump 1 in the pump head module 2 according to FIG. 1.

[0100] The powder conveying chamber 40 or the filter module block 22 has a housing structure which is in particular also designed as a module and which forms an annular chamber 42 of the powder conveying chamber 40 formed by the first filter module block 22.

[0101] A corresponding filter element 41 is accommodated or can be accommodated inside the housing structure, which is designed as a module. This is, in particular, a cartridge-like filter element 41, as can be seen in particular in the exploded view in FIG. 8.

[0102] The housing structure of the powder conveying chamber 40 is designed to apply a negative pressure or an overpressure in the interior of the housing structure as required, wherein for this purpose a corresponding connection is provided in the housing structure, which is designed to fluidly connect the interior of the housing structure to a negative pressure / vacuum source or to a compressed air source as required.

[0103] A plug-in connection area is formed on each of the opposite side areas, in particular the end face areas, of the housing structure of the powder feed chamber 40. The plug-in connection area is designed to form a plug-in connection with a correspondingly complementary mating plug-in connection area of ​​a housing structure of a pinch valve or pinch valve module block 21, which is arranged directly adjacent to the housing structure of the powder feed chamber 40, in particular a modular pinch valve or pinch valve module block 21.

[0104] It is provided that the plug connection areas formed on the opposite side areas, in particular end face areas, of the housing structure of the powder feed chamber 40 are each designed as a spigot end and are designed to form a plug connection with a sleeve-like mating plug connection area of ​​the housing structure of the pinch valve module block 21 arranged directly adjacent to the housing structure of the powder feed chamber 40.

[0105] Of course, it is also conceivable that the plug connection areas formed on the opposite side areas, in particular end face areas, of the housing structure of the powder feed chamber 40 are designed as sleeve-like plug connection areas which serve to receive a mating plug connection element designed as a spigot end, for example of a pinch valve module block 21.

[0106] Preferably, the plug-in connection areas formed on the opposite side areas, in particular the end face areas, of the housing structure of the powder conveying chamber 40 each have a seal designed to seal a plug-in connection with a mating plug-in connection area. This can, in particular, be a seal in the form of a sealing ring or in the form of a sealing lip.

[0107] The exploded view according to FIG. 4 shows that a cartridge-like filter element 41 is accommodated in the housing structure of the powder conveying chamber 40 in a replaceable or interchangeable manner.

[0108] An exemplary embodiment of the cartridge-like filter element 41 is shown in an isometric exploded view in FIG. 8. The cartridge-like filter element 41 is characterized in particular in that the filter element 41 has the means necessary for aligning and / or positioning the filter element 41 in the housing structure of the powder conveying chamber 40 forming a filter housing and / or the means necessary for sealing the cartridge-like filter element 41 relative to the filter housing.

[0109] This is achieved in particular by corresponding connection caps of the cartridge-like filter element 41, as will be described in more detail below.

[0110] Furthermore, it can be seen from the exploded view according to FIG. 8 that the cartridge-like filter element 41 has a hollow cylindrical filter body made of a material permeable to air but impermeable to coating powder and a preferably at least substantially tubular support structure 43 in which the filter body is at least partially received.

[0111] In a lateral surface of the support structure 43, window regions 44 are formed in particular in an equidistant manner.

[0112] The filter body of the cartridge-like filter element 41 is formed, for example, from polyethylene or from a material containing polyethylene, although other materials are also generally possible, in particular sintered materials.

[0113] The support structure 43 of the filter element 41 is formed from a plastic material, which is preferably transparent to allow the quality or condition of the filter body to be visually inspected from the outside. Suitable transparent plastic materials include, for example, polyvinyl chloride or polycarbonate.

[0114] Of course, other materials are also possible here. It is also not absolutely necessary for the material of the support structure 43 to be transparent.

[0115] A connection cap 45 is arranged at each end region of the support structure 43. The connection caps 45 arranged at the respective end regions of the support structure 43 are particularly designed to align and / or position the cartridge-like filter element 41 in the filter housing of the powder conveying chamber 40.

[0116] In addition, the connection caps 45 arranged at the respective end regions of the support structure 43 have a sealing function in order to seal the cartridge-like filter element 41 from the filter housing.

[0117] The connection caps 45 arranged at the respective end regions of the support structure 43 are preferably permanently connected to the support structure 43 of the filter element 41, for example, integrally connected, in particular welded.

[0118] To simplify assembly of the filter element 41, first connecting elements can be formed on the respective front end regions of the support structure 43, which are designed such that they can form a positive connection with second connecting elements which are at least partially or regionally complementary and arranged on the respective connection caps 45.

[0119] The first and second connecting elements are particularly designed to form a clip or snap connection between the connection caps 45 and the support structure 43 of the filter element 41.

[0120] The length of the support structure 43 of the filter element 41 is in particular shorter than the length of the filter body, so that in a state when the filter body is at least partially received in the support structure 43, an end region of the filter body protrudes from the end region of the support structure 43.

[0121] In this case, it is provided in particular that the connection caps 45 arranged at the respective end regions of the support structure 43 each have a region, in particular a nozzle-shaped region, which is adapted to the length and preferably also to the external shape of the end region of the filter element 41 protruding from the end region of the support structure 43, and by which the end region of the filter body protruding from the end region of the support structure 43 is preferably received at least substantially and / or at least in regions, in particular in a form-fitting manner.

[0122] Although not shown in the drawings, it is advisable in this context that an annular inner stop is formed on the nozzle-shaped region of the connection caps 45 arranged at the respective end regions of the support structure 43, against which the end face of the filter body abuts or against which the end face of the filter body rests.

[0123] In the connection caps 45, and in particular in the nozzle-shaped region of the connection caps 45 arranged at the respective end regions of the support structure 43, a through-opening is formed in each case. This through-opening extends in the longitudinal direction of the filter element 41 and is designed concentrically and / or coaxially with the hollow-cylindrical filter body. Preferably, the diameter of the through-opening corresponds at least substantially to the inner diameter of the hollow-cylindrical filter body.

[0124] From the illustration in FIG. 8 it can be seen that a seal, in particular in the form of an annular sealing lip, is formed on the free end regions of the connection caps 45 arranged on the respective end regions of the support structure 43, which seal extends at least partially or regionally in the longitudinal direction of the filter element 41.

[0125] In this context, it is particularly appropriate that the connection caps 45 arranged at the respective end regions of the support structure 43 are each designed as a monolithic plastic part, in particular a 2K plastic injection-molded part.

[0126] Preferably, the connection caps 45 have a soft plastic component and a hard plastic component, wherein at least the seal of the connection caps 45 is preferably formed partially or regionally by the soft plastic component.

[0127] Returning to the exploded view according to FIG. 4, it should be noted that the housing structure of the powder conveying chamber 40 or of the filter module block 22 is designed in two parts and has a main body 46 with a receiving area and a closing body 47 that is, in particular, detachably fastened or can be fastened to the main body 46.

[0128] A receiving area is formed in the main body 46, which serves to at least partially or regionally receive the cartridge-like filter element 41 and in particular a front end area of ​​the filter element 41 with a connection cap 45 of the filter element 41 in a form-fitting manner.

[0129] In this way, the cartridge-like filter element 41 can be inserted into the receiving area of ​​the main body 46 of the housing structure of the powder feed chamber 40.

[0130] Subsequently, the closing body 47 of the housing structure of the powder conveying chamber 40 can be releasably connected to the main body 46 of the housing structure, preferably via a clip or snap connection.

[0131] In a state when the main body 46 and the closure body 47 of the housing structure of the powder feed chamber 40 are detachably connected to one another, the cartridge-like filter element 41 is accommodated inside the volume then formed by the main body 46 and the closure body 47 connected thereto. As a result, the housing structure of the powder feed chamber 40 creates an annular chamber 42, to which a negative or positive pressure can be applied as needed.

[0132] The main body 46 of the housing structure has a particularly hollow-cylindrical structure, wherein a corresponding receiving area is formed in or on an end face or inner end face of the particularly hollow-cylindrical structure of the main body 46 in order to receive, in particular in a form-fitting manner, a connection cap 45 arranged on an end face of the cartridge-like or cartridge-shaped filter element 41.

[0133] In the same way, the closing body 47 of the housing structure of the powder feed chamber 40 can also have a corresponding receiving area which is designed to receive, in particular in a form-fitting manner, a connection cap 45 arranged on an end face of the cartridge-like filter element 41, when the main body 46 and the closing body 47 of the housing structure of the powder feed chamber 40 are preferably detachably connected to one another.

[0134] As can be seen from the illustration in FIG. 1 or FIG. 2, the powder inlet module block 20 of the pump head module 2 can be connected to a connection piece 24 for automatic operation of the powder pump 1. Specifically, the powder inlet module block 20 has an inlet area that can be connected via a plug connection to a connection piece 24 for automatic operation of the powder pump 1. The connection piece 24 for automatic operation of the powder pump 1 is angled.

[0135] Alternatively, and as indicated in FIG. 3, it is also conceivable that the powder inlet module block 20 is detachably connected to a connection piece 25 for manual operation of the powder pump 1. In this case, the powder inlet module block 20 preferably has a powder hose quick connector at the inlet area.

[0136] 26, which allows for quick and easy plugging and unplugging of a powder hose.

[0137] The powder outlet module block 23 is preferably also provided with a corresponding powder hose quick connector 26 at its outlet area.

[0138] FIG. 5a shows schematically and in an isometric view the powder outlet module block 23 of the modular pump head module 2, while FIG. 5b shows the powder outlet module block 23 schematically and in an isometric exploded view.

[0139] The powder hose quick connector 26 preferably comprises a push button 27 connected to a locking slide 28, wherein the locking slide 28 is biased by a corresponding spring 29 into a closed position, in which a powder hose connected to the powder hose quick connector 26 is securely held. By exerting a pressure force on the push button

[0140] 27 or the locking slide 28, the powder hose quick connector 26 can be moved into a second position in which the powder hose can be separated from the powder inlet module block 20.

[0141] FIG. 6 shows a schematic and isometric view of an embodiment of the modular pump head module 2, wherein in this embodiment both the powder inlet module block 20 and the powder outlet module block 23 are provided with a corresponding powder hose quick connector 26.

[0142] FIG. 7 shows a schematic and isometric exploded view of the modular pump head module 2 according to FIG. 6.

[0143] The modular pump head module 2 has a powder inlet module block 20 and a first pinch valve module block 21 with a pinch valve inlet, which is detachably connected or connectable to an outlet region of the powder inlet module block 20 via a plug connection, in particular via a bayonet lock.

[0144] In addition, the pump head module 2 shown, for example, in FIG. 7 comprises a first filter module block 22 with an inlet region which is or can be detachably connected to a pinch valve outlet region of the first pinch valve module block 21 via a plug connection, in particular via a bayonet closure.

[0145] In addition, a second pinch valve module block 21 is used with a pinch valve inlet area, which is detachably connected or connectable to an outlet area of ​​the first filter module block 22 via a plug connection, in particular via a bayonet lock.

[0146] Furthermore, a second filter module block 22 is used with an inlet area which is detachably connected or connectable to a pinch valve outlet area of ​​the second pinch valve module block 21 via a plug connection, in particular via a bayonet closure.

[0147] Finally, the modular pump head module 2, shown for example in FIG. 7, comprises a powder outlet module block 23 with an inlet region, which is or can be detachably connected to an outlet region of the second filter module block 22 via a plug-in connection, in particular via a bayonet lock. As can be seen in particular from the exploded view according to FIG. 2, the dense phase powder pump 1 has a housing shell 13, which can be detachably connected, in particular via a quick-change system, to the quick-change module 30 of the dense phase powder pump 1, designed as a connection block, and is designed to accommodate the module blocks of the pump head module 2 at least partially or regionally when connected to the quick-change module 30, designed as a connection block, when the module blocks of the pump head module 2 are in their interconnected state.

[0148] The individual module blocks of the modular pump head module 2, shown for example in FIG. 7, are each designed as plastic parts, in particular as plastic injection-molded parts.

[0149] Regardless of the specific design of the modular pump head module 2, it should be emphasized that the individual module blocks of the pump head module 2 are preferably connected or connectable to one another via a plug connection. Each plug connection is preferably formed by corresponding connecting parts of the module blocks to be connected to one another. The connecting parts are preferably designed such that, when the plug connection is established, the module blocks to be connected to one another are aligned with one another, particularly by positive locking.

[0150] In this context, it is advisable that the connecting parts are preferably designed according to the Poka-Yoke principle, so that the connecting parts can only form a plug-in connection between predefined module blocks.

[0151] In principle, it is advisable for the first and second pinch valve module blocks 21 of the modular pump head module 2 to be identical or at least substantially identical. Each pinch valve module block 21 comprises a pinch valve housing in which a pinch valve 10 designed as a cartridge-like component is interchangeably received or can be received. In this context, reference is made to the exploded views shown in FIG. 4 and FIG. 7.

[0152] As can be seen in particular from the illustration in FIG. 9, each pinch valve 10 has a valve element 11 which is at least partially tubular and whose peripheral wall can be squeezed transversely to the valve element longitudinal axis in order to change a flow cross-section of the pinch valve 10.

[0153] Each pinch valve 10 further comprises a preferably at least substantially tubular support structure 12, in which the valve element 11 is at least partially received. The support structure 12 is formed from a plurality of shell elements arranged in a row around the circumferential wall of the valve element 11 in the circumferential direction, each having an arcuate cross-section, which are attached to the outside of the valve element 11 in a radial direction relative to the longitudinal axis of the valve element.

[0154] The shell elements of the support structure 43 of the pinch valve 10 are preferably detachably connected or connectable to one another via a locking or snap connection.

[0155] In this case, it is provided in particular that at least in the interconnected state of the shell elements of the support structure 43 of the pinch valve 10, at least one and preferably two mutually opposite slot openings extending in the longitudinal direction of the support structure 43 is / are formed in the support structure 43, wherein the at least one slot opening extending in the longitudinal direction of the support structure 43 is formed at least in regions between two mutually adjacent shell elements of the support structure 43 of the pinch valve 10.

[0156] As with the first and second pinch valve 10 module blocks 21, it is advantageous with regard to the first and second filter module blocks 22 that they are identical or at least substantially identical and each form a filter housing in which a filter element 41 designed as a cartridge-like component is replaceably received or receivable. One embodiment of the filter element 41 designed as a cartridge-like component is shown in an isometric exploded view in FIG. 8.

[0157] FIG. 10 schematically shows a pneumatic diagram of the exemplary embodiment of the dense phase powder pump 1 according to the invention, shown, for example, in an isometric view in FIG. 1. As can be seen from the pneumatic diagram according to FIG. 10, the dense phase powder pump 1 is constructed according to the building block or modular principle and is divided into different modular functional components.

[0158] This is the aforementioned pump head module 2, which contains the pneumatically controllable components of the dense phase powder pump 1. The pneumatically controllable components are a powder feed chamber 40 with a filter tube or filter element 41 that defines the circumference of the powder feed chamber 40. The filter tube or filter element 41 is permeable to air, but not to coating powder, and is surrounded by an annular chamber 42, to which vacuum or compressed air can be alternately connected. This allows coating powder to be alternately sucked into the powder feed chamber 40 or expelled from the powder feed chamber 40 with compressed air.

[0159] The pump head module 2 further comprises a pinch valve 10 on the powder inlet side and a pinch valve 10 on the powder outlet side.

[0160] Additionally, an additional compressed air inlet device 39 is used. The additional compressed air inlet device 39 is preferably designed identically to the powder conveying chamber 40.

[0161] The pump head module 2 is connected or connectable to the compressed air control module 5 via a quick-change module 30.

[0162] For this purpose, the quick-change module 30 has corresponding fluid channels in order to fluidly connect the connections of the pneumatically controllable components of the pump head module 2 with corresponding switching valves 6 of the compressed air control module 5.

[0163] Corresponding filter elements 7 are accommodated in the fluid channels in an exchangeable or replaceable manner, wherein the filter elements 7 each serve as a coating powder barrier and prevent coating powder from one of the pneumatically controllable components of the pump head module 2 from entering the compressed air control module 5. The compressed air control module 5 has a plurality of switching valves 6, which are assigned to the individual components of the pump head module 2 and are designed to supply the pneumatically controllable components of the pump head module 2 with compressed air or suction air or vacuum as needed and in particular in a controlled manner.

[0164] Furthermore, an injector unit 8 is integrated into the pump head module 2, which serves to generate the negative pressure required for sucking coating powder into the powder feed chamber 40.

[0165] Furthermore, at least one pressure chamber 9 is formed in the compressed air control module 5, which serves to temporarily store the compressed air required for the operation of the pump head module 2.

[0166] The compressed air control module 5 further includes a compressed air outlet to which a compressed air line can be connected to supply a spray coating gun with spray air as needed. An electrode purge air outlet is also provided.

[0167] Like the fluid channels implemented in the quick-change module 30, the fluid channels leading to the spray air outlet and electrode rinsing outlet are provided with a corresponding filter element 41 as a coating powder barrier.

[0168] A further module block of the dense phase powder pump 1 is formed by the connection module 32, in which the electronics and digitally controlled switching or control valves of the dense phase powder pump 1 are integrated.

[0169] Finally, the dense phase powder pump 1 comprises a modular inlet valve unit (inlet valve unit module 37) with valves 60, which are fluidly connected to the compressed air inlet of the dense phase powder pump 1 and guide compressed air via corresponding fluid channels through the pump housing 31 to the switching valves 6 or pressure chambers 9 of the compressed air control module 5.

[0170] It can also be seen that pressure sensors 61 are provided in the compressed air control module 5, which serve in particular to monitor the operation of the pneumatically controllable components of the pump head module 2. The invention is not limited to the embodiment shown in the drawings, but results from a synopsis of all features disclosed herein.

[0171] List of reference symbols

[0172] 1 powder dense phase pump

[0173] 2 pump head module

[0174] 3 Powder inlet

[0175] 4 Powder outlet

[0176] 5 Compressed air control module

[0177] 6 Switching valve of the compressed air control module

[0178] 7 Filter element / coating powder barrier

[0179] 8 Injector unit

[0180] 9 Pressure chamber

[0181] 10 Pinch valve

[0182] 11 Valve element of the pinch valve

[0183] 12 Pinch valve support structure

[0184] 13 Housing shell

[0185] 20 Powder inlet module block

[0186] 21 Pinch valve module block

[0187] 22 Filter module block

[0188] 23 Powder outlet module block

[0189] 24 connection nozzles (automatic operation)

[0190] 25 connection pieces (manual operation)

[0191] 26 Powder hose quick connector

[0192] 27 Push button (powder hose quick connection)

[0193] 28 Locking slide (powder hose quick connection)

[0194] 29 Spring (powder hose quick connector)

[0195] 30 quick-change system

[0196] 31 Pump housing

[0197] 32 connection module

[0198] 33 HMI interface

[0199] 34 connection

[0200] 35 Data / control line connection

[0201] 36 digital positioner

[0202] 37 Input valve unit module

[0203] 38 Main compressed air connection

[0204] 39 Additional compressed air inlet device

[0205] 40 Powder feed chamber

[0206] 41 Filter element of the powder feed chamber

[0207] 42 Powder feed chamber annular chamber Filter element support structure Window area Connection cap Filter module block main body Filter module block closure body Valve of the input valve unit module Pressure sensor

Claims

Patent claims 1. A dense phase powder pump (1) for conveying coating powder from a first powder reservoir to a second powder reservoir or to a powder spraying device, the dense phase powder pump (1) being characterized by its modular design and comprising at least the following components, each designed as a module: a pump head module (2) having at least one powder conveying chamber (40) which is or can be fluidly connected to the first powder reservoir via a powder inlet (3) and to the second powder reservoir or to the powder spraying device via a powder outlet (4); and a compressed air control module (5) having a plurality of switching valves (6) which are assigned, in particular, to pneumatically controllable components of the pump head module (2) and are designed to supply the pneumatically controllable components of the pump head module (2) with compressed air or suction air or, as required, in particular in a controlled manner.To supply negative pressure, wherein the pump head module (2) is detachably connected or connectable to the compressed air control module (5) via a quick-change module (30) designed as a connection block of the powder dense phase pump (1), in particular in such a way that when the pump head module (2) is connected to the compressed air control module (5), the pneumatically controllable components of the pump head module (2) are fluidly connected to the switching valves (6) of the compressed air control module (5) via the quick-change module (30) designed as a connection block.

2. Dense-phase powder pump (1) according to claim 1, wherein the pump head module (2) is modular in design and comprises the following individually replaceable or interchangeable components: a powder inlet module block (20); a first pinch valve module block (21) with a pinch valve inlet, which is or can be detachably connected to an outlet region of the powder inlet module block (20) via a plug connection, in particular via a bayonet lock; a first filter module block (22) with an inlet region, which is or can be detachably connected to a pinch valve outlet region of the first pinch valve module block (21) via a plug connection, in particular via a bayonet lock; a second pinch valve module block (21) with a pinch valve inlet area which is or can be detachably connected to an outlet area of the first filter module block (22) via a plug connection, in particular via a bayonet closure;a second filter module block (22) with an inlet region that is or can be detachably connected to a pinch valve outlet region of the second pinch valve module block (21) via a plug connection, in particular via a bayonet lock; and a powder outlet module block (23) with an inlet region that is or can be detachably connected to an outlet region of the second filter module block (22) via a plug connection, in particular via a bayonet lock.

3. Dense-phase powder pump (1) according to claim 2, wherein the dense-phase powder pump (1) has a housing shell (13) which can be detachably connected, in particular via a quick-change system, to the quick-change module (30) designed as a connection block and is designed to receive the module blocks of the pump head module (2) at least partially or regionally when connected to the quick-change module (30) designed as a connection block, when the module blocks of the pump head module (2) are in their interconnected state.

4. Powder dense phase pump (1) according to claim 2 or 3, wherein the individual module blocks of the pump head module (2) are each designed as plastic parts, in particular as plastic injection-molded parts.

5. Dense-phase powder pump (1) according to one of claims 2 to 4, wherein the powder inlet module block (20) has an inlet area which can be connected via a plug connection, in particular via a bayonet lock, optionally to a connecting piece (25) for manual operation of the dense-phase powder pump (1) or to a connecting piece (24) for automatic operation of the dense-phase powder pump (1), wherein the connecting piece (25) for manual operation of the dense-phase powder pump (1) is straight and the connecting piece (24) for automatic operation of the dense-phase powder pump (1) is angled.

6. Dense-phase powder pump (1) according to one of claims 2 to 4, wherein the powder inlet module block (20) is optionally a powder inlet module block (20) with an inlet area which is or can be connected via a plug connection, in particular via a bayonet lock, to a connection piece (25) for manual operation of the dense-phase powder pump (1), or a powder inlet module block (20) with an angled inlet area for automatic operation of the dense-phase powder pump (1).

7. Powder dense phase pump (1) according to one of claims 2 to 6, wherein preferably each plug connection is formed by corresponding connecting parts of the module blocks to be connected to one another, wherein the connecting parts are designed such that when the plug connection is produced, the module blocks to be connected to one another are aligned to one another in particular by positive locking.

8. Powder dense phase pump (1) according to claim 7, wherein the connecting parts are preferably designed according to the Poka-Yoke principle such that the connecting parts have only one Can form a plug connection between predefined module blocks.

9. Dense phase powder pump (1) according to one of claims 2 to 8, wherein the first and second pinch valve module blocks (21) are identical or at least substantially identical and each form a pinch valve housing in which a pinch valve (10) designed as a cartridge-like component is or can be exchangeably received.

10. Dense-phase powder pump (1) according to claim 9, wherein the pinch valve (10) has a valve element (11) which is at least partially tubular, the peripheral wall of which can be squeezed together transversely to the longitudinal axis of the valve element in order to change the flow cross-section of the pinch valve (10), and further has a preferably at least substantially tubular support structure (12) in which the valve element (11) is at least partially received, wherein the support structure (12) consists of a plurality of shell elements which are arranged in a row around the peripheral wall of the valve element (11) in the circumferential direction of the circumferential wall and each have an arcuate cross-section, and which are attached to the outside of the valve element (11) in a radial direction with respect to the longitudinal axis of the valve element.

11. Powder dense phase pump (1) according to claim 10, wherein the shell elements of the support structure (12) of the pinch valve (10) are or can be connected to one another, preferably detachably, via a locking or snap connection.

12. Powder dense phase pump (1) according to claim 10 or 11, wherein at least in the interconnected state of the shell elements of the support structure (12) of the pinch valve (10) in the support structure (12) at least one and preferably two mutually opposite slotted openings are formed, extending in the longitudinal direction of the support structure (12), wherein the at least one slotted opening is formed in the longitudinal direction of the Support structure (12) extending slot opening is formed at least in regions between two adjacent shell elements of the support structure (12) of the pinch valve (10).

13. Dense phase powder pump (1) according to one of claims 2 to 12, wherein the first and second filter module blocks (22) are identical or at least substantially identical and each form a filter housing in which a filter element (41) designed as a cartridge-like component is or can be exchangeably received.

14. Dense-phase powder pump (1) according to claim 13, wherein the cartridge-like filter element (41) comprises a hollow-cylindrical filter made of a material permeable to air but impermeable to coating powder, in particular a polyethylene material or a sintered material, and a preferably at least substantially tubular support structure (43) in which the filter (41) is at least partially received, wherein a plurality of window regions (44) are formed in a lateral surface of the support structure (43), which window regions are preferably arranged in an equidistant manner, wherein a connection cap (45) is arranged at each of the respective end regions of the support structure (43).

15. Powder dense phase pump (1) according to claim 14, wherein the connection cap (45) is preferably permanently connected to the support structure (43) of the filter element (41) and in particular is welded.

16. Dense phase powder pump (1) according to claim 14 or 15, wherein the length of the support structure (43) of the filter element (41) is shorter than the length of the filter (41), so that in a state when the filter (41) is at least partially accommodated in the support structure (43), an end region of the filter element (41) protrudes from the end region of the support structure (43), wherein the connection cap (45) has a connection adapted to the length and to the external shape of the end region of the Support structure (43) projecting end region of the filter element (41) has a nozzle-shaped region adapted to said support structure (43), by which the end region of the filter element (41) projecting from the end region of the support structure (43) is received, wherein an annular inner stop is formed on the free end region of the nozzle-shaped region opposite the support structure (43) of the filter element (41), against which the end face of the filter element (41) abuts or against which the end face of the filter element (41) rests.

17. Powder dense phase pump (1) according to one of claims 14 to 16, wherein an outer diameter of the nozzle-shaped region is larger than the outer diameter of the support structure (43) of the filter element (41) at least in a section of the nozzle-shaped region.

18. Powder dense phase pump (1) according to one of claims 14 to 17, wherein a through-opening is formed in the nozzle-shaped region, which through-opening extends in the longitudinal direction of the filter element (41) and is designed concentrically and / or coaxially to the hollow cylindrical filter (41), wherein the diameter of the through-opening corresponds at least substantially to the inner diameter of the hollow cylindrical filter element (41).

19. Powder dense phase pump (1) according to one of claims 14 to 18, wherein a seal, in particular in the form of an annular sealing lip, which extends at least partially or regionally in the longitudinal direction of the filter element (41), is formed on the free end region of the nozzle-shaped region opposite the support structure (43).

20. Powder seal pump (1) according to claim 19, wherein the nozzle-shaped region is designed as a monolithic plastic part, in particular a 2K plastic injection-molded part, and has a plastic soft component and a plastic hard component, wherein at least the seal is preferably formed partially or regionally by the plastic soft component.

21. Pump head module (2) for a dense phase powder pump (1), in particular according to claim 1, wherein the pump head module (2) has at least one powder conveying chamber (40) which is or can be fluidly connected to a first powder reservoir via a powder inlet (3) and to a second powder reservoir or to a powder spray device via a powder outlet (4), characterized in that the pump head module (2) is modular in design and has the following individually replaceable or interchangeable components: a powder inlet module block (20); a first pinch valve module block (21) with a pinch valve inlet, which is or can be detachably connected to an outlet region of the powder inlet module block (20) via a plug-in connection, in particular via a bayonet lock;a first filter module block (22) with an inlet region that is or can be detachably connected to a pinch valve outlet region of the first pinch valve module block (21) via a plug connection, in particular via a bayonet lock; a second pinch valve module block (21) with a pinch valve inlet region that is or can be detachably connected to an outlet region of the first filter module block (22) via a plug connection, in particular via a bayonet lock; a second filter module block (22) with an inlet region that is or can be detachably connected to a pinch valve outlet region of the second pinch valve module block (21) via a plug connection, in particular via a bayonet lock;and a powder outlet module block (23) with an inlet region which is or can be detachably connected to an outlet region of the second filter module block (22) via a plug connection, in particular via a bayonet lock; 22. Pinch valve (10), in particular for a pinch valve module block (21) of a pump head module (2) for a dense phase powder pump (1) according to claim 21, wherein the pinch valve module block (21) is a Pinch valve housing in which the pinch valve (10) designed as a cartridge-like component is exchangeably received or can be received, wherein the pinch valve (10) has a valve element (11) which is at least partially tubular and whose peripheral wall can be squeezed together transversely to the valve element longitudinal axis in order to reduce the flow cross-section of the pinch valve (10) and further comprises a preferably at least substantially tubular support structure (43) in which the valve element (11) is at least partially accommodated, wherein the support structure (43) consists of several shell elements arranged in a row around the circumferential wall of the valve element (11), each having an arcuate cross-section, which are connected to the outside of the valve element in a radial direction with respect to the longitudinal axis of the valve element (11) are set.

23. Pinch valve (10) according to claim 22, wherein the shell elements of the support structure (43) of the pinch valve (10) are or can be connected to one another, preferably releasably, via a locking or snap connection.

24. Pinch valve (10) according to claim 22 or 23, wherein at least in the interconnected state of the shell elements of the support structure (43) of the pinch valve (10), at least one and preferably two mutually opposite slotted openings extending in the longitudinal direction of the support structure (43) is / are formed in the support structure (43), wherein the at least one slotted opening extending in the longitudinal direction of the support structure (43) is formed at least in regions between two mutually adjacent shell elements of the support structure (43) of the pinch valve (10).

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