Radial piston pump

Abstract

A radial piston pump 400 for conveying high-pressure fluid is provided. The radial piston pump 400 has a suction port 10, a pressure port 12, and a plurality of pump elements for conveying the high-pressure fluid from the suction port 10 to the pressure port 12. Furthermore, the radial piston pump 400 comprises a high-pressure-resistant suction line structure connecting the suction port 10 to at least one suction inlet of each pump element.

Description

[0001] The present invention relates to a radial piston pump for conveying fluid under high pressure.

[0002] Radial piston pumps are well known and are used to pump fluid at pressure-side loads of up to 1000 bar and more. Such radial piston pumps generally comprise a suction port, a pressure port, several pump elements, a pump shaft defining a pump axis, and an eccentric. Each pump element comprises at least one suction inlet and at least one pressure outlet. The pump shaft is designed to drive the pump elements via the eccentric in order to pump the fluid from the suction port to the pressure port. Furthermore, such a radial piston pump typically comprises a high-pressure-resistant pressure line structure that connects the pressure port to the at least one pressure outlet of each pump element.

[0003] Typically, the fluid is pumped on the suction side from a tank or housing reservoir of a pump unit in which the radial piston pump is used. At the suction port, the fluid to be pumped is drawn in by the radial piston pump from the tank or housing reservoir. At the pressure port, the fluid pumped by the radial piston pump is made available to a higher-level fluid system.

[0004] The fluid in the tank or housing reservoir is usually at approximately ambient pressure. Under certain circumstances, the tank or housing reservoir can also be pressurized with low pressure up to 10 bar, if the specific application requires it. However, conventional radial piston pumps that pump from a tank or housing reservoir are not suitable for suction-side pressures above 10 bar.

[0005] In new fields of application, for example in the mobile refueling of vehicles with hydrogen from special tank vehicles, there are increasingly applications in which a fluid to be pumped by a pump (suction side) is already under high pressure of up to 1000 bar.

[0006] Against this background, it is an object of the present invention to provide a radial piston pump which is suitable for conveying fluid under high pressure.

[0007] This object is achieved by means of a radial piston pump for conveying high-pressure fluid according to claim 1. Advantageous further developments are described in the dependent claims.

[0008] According to the invention, the radial piston pump for conveying fluid under high pressure comprises a high-pressure-resistant suction line structure which connects the suction connection to the at least one suction inlet of each pump element.

[0009] For the purposes of the present disclosure, a high-pressure fluid is understood to mean a fluid under a pressure of more than 10 bar and up to 1000 bar, more precisely between 20 bar and 1000 bar, and even more precisely between 500 bar and 1000 bar. The conveyance of a high-pressure fluid is understood to mean that the fluid is already under high pressure on the suction side (and not just on the discharge side of the radial piston pump).

[0010] For the purposes of the present disclosure, a pump element is understood to be an arrangement of at least one radial piston, a suction valve, and a pressure valve for pumping fluid. Furthermore, a pump element can comprise a return element, for example in the form of a return spring, for each radial piston.

[0011] In particular, the high-pressure-resistant suction line structure is designed to maintain a pressure of over 10 bar and up to 1000 bar, preferably between 20 bar and 1000 bar, more preferably between 500 bar and 1000 bar, between the suction connection and the suction inlet of each pump element. For this purpose, the high-pressure-resistant suction line structure is formed, in particular, at least in sections as a separate piping arrangement, which is formed, in particular, from metal pipes and metal connectors, or at least in sections as an arrangement of lines integrated into a metal block, or a combination thereof.

[0012] The radial piston pump according to the invention is suitable for pumping fluids under high pressure.

[0013] Preferably, the plurality of pump elements are arranged in at least two axial pump planes, which differ from one another in their axial position relative to the pump axis. This allows the achievable displacement of the radial piston pump to be increased in a compact arrangement.

[0014] The high-pressure-resistant suction line structure is expediently formed at least partially by a separate piping arrangement. The separate piping arrangement is to be understood in particular as an arrangement of pipes that are separate from a housing of the radial piston pump. This allows the high-pressure-resistant suction line structure to be designed flexibly.

[0015] It is advantageous if the high-pressure-resistant suction line structure is at least partially, preferably completely, integrated into a housing of the radial piston pump, preferably in the form of an internal line structure. For this purpose, the housing can be formed from a single housing block or multiple housing blocks. The at least partial, preferably complete, integration of the high-pressure-resistant suction line structure into the housing of the radial piston pump allows the radial piston pump to be designed to be particularly compact and space-efficient.

[0016] It is further advantageous if the high-pressure-resistant suction line structure comprises at least one suction manifold section and at least one suction riser section, wherein the at least one suction manifold section extends at least partially circumferentially with respect to the pump axis and the at least one suction riser section extends parallel to the pump axis. This enables modular expansion of the radial piston pump with additional pump elements.

[0017] In one alternative, each pump element is arranged in a separate housing block. In other words, each pump element has its own housing block. Such pump elements for radial piston pumps are available as standard components that can be combined in any number. This increases flexibility and reduces the design effort involved in the design of the radial piston pump.

[0018] In a preferred alternative, the multiple pump elements are arranged in at least one annular housing block. In other words, multiple pump elements are arranged in each annular housing block of the radial piston pump. This enables a particularly compact and space-efficient design of the radial piston pump.

[0019] In an alternative, the at least one suction manifold section is formed by a separate piping arrangement. This allows for a flexible design of the high-pressure-resistant suction line structure.

[0020] In a further alternative, the at least one suction manifold section is formed in at least one separate manifold plate. In particular, the radial piston pump comprises at least two annular housing blocks, with at least one separate manifold plate arranged between two annular housing blocks. For the purposes of this application, a separate manifold plate is to be explicitly distinguished from a separate piping arrangement. A separate manifold plate enables the arrangement of multiple lines in one plate, whereas in a separate piping arrangement, multiple separate piping elements are connected to one another to form a separate piping arrangement. The use of a separate manifold plate enables a radially compact design of the high-pressure-resistant suction line structure.

[0021] In an alternative, the at least one suction riser section is formed by a separate piping arrangement. This allows for a flexible design of the high-pressure-resistant suction line structure.

[0022] In a preferred alternative, the at least one suction-collecting line section, in particular in the form of an at least partially circumferential suction-collecting groove, is integrated into the at least one annular housing block. This enables a particularly compact and space-efficient design of the high-pressure-resistant suction line structure.

[0023] In a preferred alternative, the at least one suction riser section, in particular in the form of a suction through-bore, is integrated into the at least one annular housing block. This enables a particularly compact and space-efficient design of the high-pressure-resistant suction line structure and thus of the entire radial piston pump, particularly if the at least one suction manifold section is also integrated into the at least one annular housing block.

[0024] Preferably, each annular housing block comprises three suction riser sections in the form of suction through-bores and three suction collection line sections in the form of partially circumferential suction collection grooves, with each suction through-bore opening into a suction collection groove on one side, particularly centrally in the circumferential direction, and opening into an axial end face of the annular housing block on the other side. This enables a particularly compact and space-efficient design of the high-pressure-resistant suction line structure and thus of the entire radial piston pump.

[0025] Preferably, a mirror plane is further defined by the pump axis and a suction riser section, wherein the high-pressure-resistant suction line structure is mirror-symmetrical to the mirror plane. In particular, the high-pressure-resistant pressure line structure is also mirror-symmetrical to the mirror plane. This allows the radial piston pump to be easily supplemented with additional pump elements in a modular manner along the pump axis, thereby increasing the achievable delivery volume of the radial piston pump.

[0026] It is also expedient if the pump elements do not include any return elements. Due to the high-pressure fluid on the intake side, return elements such as return springs can be dispensed with in the radial piston pump according to the invention, since the high-pressure fluid on the intake side ensures the return of the radial pistons of the pump elements. This allows the number of required components to be reduced, thereby lowering both the manufacturing costs and resource consumption and the risk of failure of the radial piston pump.

[0027] Advantageously, the pump shaft is arranged at least in sections in a housing space of the radial piston pump, wherein the housing space is pressure-tight with respect to the environment and a cleaning fluid that is different from the fluid to be pumped and is preferably pre-pressurized with respect to the ambient pressure is accommodated in the housing space. More preferably, the radial piston pump comprises a cleaning fluid inlet for introducing the cleaning fluid into the housing space and a cleaning fluid outlet for discharging the cleaning fluid from the housing space. In particular, the cleaning fluid is pre-pressurized with respect to the ambient pressure, for example to 2 to 3 bar. This enables the cleaning fluid to be exchanged during ongoing operation of the radial piston pump. In this way, any leaks of the fluid to be pumped into the housing space can be absorbed by the cleaning fluid and discharged via the cleaning fluid outlet.In this way, the components in the housing space (e.g. the pump shaft, the eccentric, the eccentric bearings and other components) can be protected from potentially harmful influences of the fluid to be pumped.

[0028] The radial piston pump designed according to the invention for pumping high-pressure fluid can operate particularly energy-efficiently, as it only needs to raise the pressure of the pumped fluid by the pressure difference between the high-pressure suction side and the pressure side. Furthermore, the radial piston pump according to the invention prevents the formation of cavitations during the suction process. Furthermore, the radial piston pump according to the invention can reduce the suction force of the radial pistons of the pumping elements, thus preventing the radial pistons from lifting off the eccentric, so that the radial piston pump can be operated at significantly higher speeds without increased wear.

[0029] The invention is explained in more detail below with reference to embodiments shown in the figures. These schematically show: Fig. 1 a perspective view of parts of a radial piston pump according to the invention according to a first embodiment; Fig. 2 a plan view of the radial piston pump from Fig. 1; Fig. 3 a perspective view of a radial piston pump according to the invention according to a variant of the first embodiment; Fig. 4 a plan view of the radial piston pump from Fig. 3; Fig. 5 is a perspective exploded view of a radial piston pump according to the invention according to a second embodiment; Fig. 6 another perspective view of the radial piston pump from Fig. 5; Fig. 7 is an exploded perspective view of a radial piston pump according to the invention in accordance with a variant of the second embodiment; Fig. 8 is a perspective view of a radial piston pump according to the invention according to a third embodiment; Fig. 9 a perspective view of a ring housing block of the radial piston pump from Fig. 8; Fig. 10 another perspective view of the ring housing block from Fig. 9; Fig. 11 is a perspective view of a radial piston pump according to the invention in accordance with a fourth embodiment; Fig. 12 a perspective view of a ring housing block of the radial piston pump from Fig. 11; Fig. 13 another perspective view of the ring housing block from Fig. 12; Fig. 14 a perspective view of the line structures inside the ring housing block from Fig. 12; Fig. 15 a partially sectioned perspective view to illustrate the pipe structures inside the radial piston pump of Fig. 11; and Fig. 16 a perspective view of a sealing plate of the radial piston pump from Fig. 11.

[0030] In Fig. 1 and Fig. 2 shows a radial piston pump 100 for conveying high-pressure fluid according to a first embodiment of the present invention.

[0031] The radial piston pump 100 comprises a suction port 10, a pressure port 12, a plurality of pump elements 14, a pump shaft 16 defining a pump axis A, and an eccentric 18. The Fig. 1 and Fig. The radial piston pump 100 shown in Figure 2 comprises five pump elements 14. Each pump element 14 comprises a suction inlet 20 and a pressure outlet 22. The pump shaft 16 is configured to drive the pump elements 14 via the eccentric 18 in order to convey the high-pressure fluid from the suction port 10 to the pressure port 12. The radial piston pump 100 comprises a high-pressure-resistant pressure line structure 24 that connects the pressure port 12 to the pressure outlet 22 of each pump element 14.

[0032] The radial piston pump 100 further comprises a high-pressure-resistant suction line structure 26 which connects the suction port 10 to the suction inlet 22 of each pump element 14.

[0033] The pump elements 14 of the radial piston pump 100 are, as shown in Fig. 1 and Fig. 2, each arranged in a separate housing block 28.

[0034] The high-pressure-resistant suction line structure 26 of the radial piston pump 100 is, as shown in Fig. 1 and Fig. 2, is formed by a separate piping arrangement 30. For this purpose, T-pieces 32 are mounted on the suction inlets 22 of the pump elements 14, which in turn are connected to one another in the circumferential direction via pipe sections 33. Thus, the separate piping arrangement 30 forms a suction manifold section 34 of the high-pressure-resistant suction line structure 26, which extends completely circumferentially with respect to the pump axis A. As a result, the suction manifold section 34 of the high-pressure-resistant suction line structure 26 connects all suction inlets 22 of the pump elements 14 to one another and to the suction connection 10 of the radial piston pump 100.

[0035] The high-pressure-resistant pressure line structure 24 of the first embodiment is designed as a separate pressure manifold arrangement 36, which connects all pressure outlets 22 of the pump elements 14 to one another and to the pressure connection 12 of the radial piston pump 100.

[0036] As in Fig. 1 and Fig. As can be seen in Figure 2, the pump elements 14 are arranged in an axial pump plane with respect to the pump axis A.

[0037] In this embodiment, the pump elements 14 also comprise return elements in the form of return springs 38. Since the fluid pumped by the radial piston pump 100 at the suction port 10 is under high pressure of more than 10 bar, preferably between 20 bar and 1000 bar, more preferably between 500 bar and 1000 bar, the return springs 38 can be omitted.

[0038] In Fig. 3 and Fig. 4 shows a radial piston pump 100' according to a variant of the first embodiment, which, compared to the radial piston pump 100, comprises five further pump elements 14, which are arranged in a second axial pump plane with respect to the pump axis A. The second axial pump plane differs in its axial position with respect to the pump axis A from that shown in Fig. 1 shown axial pump plane. As shown in Fig. 3, the second axial pump plane is in the axial direction of the pump axis A with a view to Fig. 3 below the Fig. 1 shown axial pump plane.

[0039] In this variant of the first embodiment, the high-pressure-resistant pressure line structure 24 is formed by a pressure collection plate 44 instead of the separate pressure collection pipe arrangement 36, which connects the pressure outlets 22 of all ten pump elements 14 to each other and to the pressure connection 12. In addition, the separate pipe arrangement 30 of the radial piston pump 100', in contrast to the radial piston pump 100 of the Fig. 1 and Fig. 2 a suction riser section 52, so that the high-pressure-resistant suction line structure 26 connects all ten suction inlets 20 of the pump elements 14 to each other and to the suction connection 10 of the radial piston pump 100'.

[0040] In Fig. 5 and Fig. Figure 6 shows a radial piston pump 200 according to a second embodiment of the present invention. For the sake of clarity, only those elements of the radial piston pump 200 are shown that are necessary for explanation. For example, the pump shaft 16 and the eccentric 18 are shown in the Fig. 5 and Fig. 6 not shown.

[0041] The radial piston pump 200 according to the second embodiment comprises an annular housing block 40 in which twelve pump elements 14 are arranged in an axial pump plane. The pump elements 14 of the radial piston pump 200 each comprise two suction inlets 20 and one pressure outlet 22 (see FIG. Fig. 6). In this embodiment, the ring housing block 40 further comprises twelve mounting holes 42.

[0042] As in the Fig. 5 and Fig. 6, the radial piston pump 200 also comprises a pressure collection plate 44 with twelve pressure inlets 46 and twelve mounting holes 48, which correspond to the pressure outlets 22 of the pump elements 14 and the mounting holes 42 of the annular housing block 40. The pressure connection 12 of the radial piston pump 200 is formed in the pressure collection plate 44. Inside the pressure collection plate 44, all pressure inlets 46 are connected to the pressure connection 12. In the assembled state of the radial piston pump 200, when the pressure collection plate 44 is attached to the annular housing block 40, the pressure outlets 22 of the pump elements 14 are fluid-tightly connected to the pressure inlets 46 of the pressure collection plate 44. The pressure collection plate 44 thus forms the high-pressure-resistant pressure line structure 24 of the radial piston pump 200.

[0043] In a similar way to the first embodiment of the Fig. 1 to 4, the high-pressure-resistant suction line structure 26 of the radial piston pump 200 of the second embodiment is formed by a separate piping arrangement 30. The two in the Fig. 5 and Fig. 6 partially shown, fully circumferential suction manifold sections 34 of the high-pressure-resistant suction line structure 26 of the radial piston pump 200 are connected to one another via a suction riser section 52 of the high-pressure-resistant suction line structure 26 of the radial piston pump 200, so that all suction inlets 20 of the pump elements 14 are connected to the suction connection 10 in a fluid-tight manner.

[0044] In a variant of the second embodiment, which is shown in Fig. 7, the radial piston pump 200' comprises a second annular housing block 40 which is arranged in a second axial pump plane. Here, the second annular housing block 40 is arranged below the pressure collecting plate 44. The pressure inlets 46 of the pressure collecting plate 44 are designed such that they extend axially through the pressure collecting plate 44. As a result, the pressure outlets 22 of the pump elements 14 of the annular housing blocks 40 arranged in the two axial pump planes can be connected axially from both sides to the pressure connection 12 via the pressure collecting plate 44. In this case, the high-pressure-resistant suction line structure 26 comprises at least one further suction riser section in order to also fluidly connect the suction connection 10 to all suction inlets 22 of the pump elements 14 arranged in the second axial pump plane.

[0045] It is also conceivable that the radial piston pump 200' comprises a total of more than two annular housing blocks 40. In this case, the radial piston pump 200' also comprises more than one pressure collecting plate 44, wherein in this case the pressure collecting plates 44 are additionally connected by a separate piping arrangement which forms at least one pressure riser section of the high-pressure-resistant pressure line structure 24, as is shown, for example, in Fig. 8 for the third embodiment, in order to connect all pressure outlets 22 of the pump elements 14 to the pressure connection 12 of the radial piston pump 200.

[0046] In the Fig. Figures 8 to 10 illustrate a radial piston pump 300 according to a third embodiment of the present invention. For the sake of clarity, only those elements of the radial piston pump 300 that are necessary for explanation are shown.

[0047] The radial piston pump 300 comprises three ring housing blocks 40, two pressure collecting plates 44 and two suction collecting plates 50.

[0048] The suction collection plates 50 form the suction collection sections 34 of the high-pressure-resistant suction line structure 26 of the radial piston pump 300. A separate piping structure 30 forms a suction riser section 52 of the high-pressure-resistant suction line structure. The suction riser section 52 connects the suction collection plates 50 to one another and to the suction port 10 of the radial piston pump 300. Thus, the high-pressure-resistant suction line structure 26 connects the suction inlets 20 of all pump elements 14 to the suction port 10 of the radial piston pump 300.

[0049] Similarly, a separate piping structure 30 forms a pressure riser section of the high-pressure-resistant pressure line structure 24 of the radial piston pump 300, which connects the two pressure collection plates 44 to each other and to the pressure connection 12. Thus, the high-pressure-resistant pressure line structure 24 connects the pressure outlets 22 of all pump elements 14 to the pressure connection 12 of the radial piston pump 300.

[0050] In the ring housing blocks 40 of the radial piston pump 300, both the suction inlets 20 (see Fig. 9) as well as the pressure outputs 22 (see Fig. 10) of the pump elements 14 are aligned parallel to the pump axis A.

[0051] Those skilled in the field of radial piston pumps will appreciate that, depending on the requirements profile, the radial piston pump 300 may also comprise more or fewer than three annular housing blocks 40 and a corresponding number of pressure collecting plates 44 or suction collecting plates 50. The same applies analogously to the first and second embodiments as well as the fourth embodiment described below.

[0052] In the Fig. 11 to 16, a radial piston pump 400 according to a fourth embodiment is shown.

[0053] In the radial piston pump 400, both the high-pressure-resistant suction line structure 26 and the high-pressure-resistant pressure line structure 24 are completely integrated into the housing of the radial piston pump 400.

[0054] The housing of the radial piston pump 400 is formed by five ring housing blocks 40, a pressure collecting plate 44 and a suction collecting plate 50. Between each two ring housing blocks 40, a sealing plate 51 is arranged, which is shown in detail in Fig. 16. The five ring housing blocks 40 are arranged in five axial pump planes with respect to the pump axis A.

[0055] The Fig. 12 to 15 illustrate an internal piping structure 53 of the ring housing blocks 40 of the radial piston pump 400.

[0056] Like in your Fig. 12 to 14, the high-pressure-resistant suction line structure 26 of the radial piston pump 400 in a ring housing block 40 comprises three partially circumferential suction collecting line sections 34 in the form of partially circumferential suction collecting grooves 54. Furthermore, the high-pressure-resistant suction line structure 26 of the radial piston pump 400 in a ring housing block 40 comprises three suction riser sections 52 in the form of suction through-bores 56. Each suction through-bore 56 opens into a suction collecting groove 54 on one side (see Fig. 12) and on the other side into an axial end face of the ring housing block 40 (see Fig. 13). More precisely, each suction through-bore 56 opens centrally into a suction collecting groove 54, viewed in the circumferential direction of the pump axis A.

[0057] Similarly, the high-pressure-resistant pressure line structure 24 of the radial piston pump 400 in a ring housing block 40 comprises three partially circumferential pressure collection line sections in the form of partially circumferential pressure collection grooves 58. Furthermore, the high-pressure-resistant pressure line structure 26 of the radial piston pump 400 in a ring housing block 40 comprises three pressure riser sections in the form of pressure through-bores 60. Each pressure through-bore 60 opens into a pressure collection groove 58 on one side (see Fig. 13) and on the other side into an axial end face of the ring housing block 40 (see Fig. 12). More precisely, each pressure through-bore 60 opens centrally into a pressure collecting groove 58, viewed in the circumferential direction of the pump axis A.

[0058] This results in, as in Fig. 15 schematically shows a mirror-symmetrical arrangement of the high-pressure-resistant suction line structure 26 and the high-pressure-resistant pressure line structure 24 with respect to a mirror plane S defined by the pump axis A and a suction-riser section 52 for three annular housing blocks 40. Thus, by alternately rotating the individual annular housing blocks 40 by 180 degrees about a horizontal axis passing through the mirror plane S, any number of annular housing blocks 40 can be modularly combined with one another to increase the maximum achievable volume flow of the radial piston pump 400. In other words, each sealing plate 51 functions as an additional mirror plane T for the two annular housing blocks 40 arranged directly thereon.

[0059] It will be apparent to those skilled in the art in the field of radial piston pumps that the high-pressure-resistant suction line structure 26 of the radial piston pump 400 according to the fourth embodiment is designed for a ring housing block 40 (cf. Fig. 14) is not limited to the number of three suction collecting grooves 54, three suction through-bores 56, three pressure collecting grooves 58, and three pressure through-bores 60. Thus, in a housing block 40, only two or more than three suction collecting grooves 54, suction through-bores 56, pressure collecting grooves 58, and pressure through-bores 60 can be arranged in such a way that the mirror symmetry to the mirror plane S is maintained.

[0060] As further stated in Fig. 16, the sealing plate 51 in this embodiment comprises three partially circumferential collecting recesses 62, three rising recesses 64 and twelve fastening recesses. In the assembled state of the radial piston pump 400, the collecting recesses 62 correspond to the suction collecting grooves 54 or the pressure collecting grooves 58 of the annular housing blocks 40 adjacent to the sealing plate 51. Furthermore, in the assembled state of the radial piston pump 400, the rising recesses 64 correspond to the suction through-bores 56 or the pressure through-bores 60 of the annular housing blocks 40 adjacent to the sealing plate 51. The same applies to the fastening recesses 66. The person skilled in the art will recognize that the recesses in the sealing plate 51 can also be arranged differently in order to correspond to adjacent elements of the radial piston pump 400, such as the annular housing block 40 or any collecting plates that may be present.

[0061] As also in Fig. 16, the sealing plate 51 in this embodiment further comprises six sealing elements 68, which are arranged in the collecting recesses 62 and the rising recesses 64 such that the sealing plate 51 ensures a fluid-tight connection between the two annular housing blocks 40 adjacent to the sealing plate 51. In addition, the sealing plate has a further, circumferential sealing element 68 on the inner circumference of the sealing plate 51, which seals a housing chamber 70 of the radial piston pump 400.

[0062] The sealing of the individual housing elements of the radial piston pump 400, such as the ring housing blocks 40, with each other and also the sealing of the housing chamber 70 can be achieved by other known sealing means than the sealing plate 51 discussed in detail here.

[0063] For example, in the Fig. As can be seen in Figures 11 to 13, the pump shaft 16 of the radial piston pump 400 is arranged in sections in the housing space 70 of the radial piston pump 400. The housing space 70 is designed to be pressure-tight with respect to the environment, and a cleaning fluid, which differs from the fluid to be pumped by the radial piston pump 400 and is preferably pre-pressurized with respect to the ambient pressure, is accommodated in the housing space 70. In Fig. 11, it is not shown that the radial piston pump 400 further comprises a cleaning fluid inlet for introducing the cleaning fluid into the housing space 70 and a cleaning fluid outlet for discharging the cleaning fluid from the housing space 70. The cleaning fluid can be pre-pressurized relative to the ambient pressure, for example, to 2 to 3 bar. An analogous configuration is also conceivable for the radial piston pumps of the second, third, and fourth embodiments.

[0064] In a further alternative of the fourth embodiment, the high-pressure-resistant suction line structure 26 in a ring housing block can also comprise only one suction collecting groove 54, one suction through-bore 56, one pressure collecting groove 56, and one pressure through-bore 60. In this case, corresponding pressure collecting plates 44 and suction collecting plates 50 are arranged between the ring housing blocks 40. For example, in this case, the suction collecting groove 54 can be formed completely circumferentially with a first radius on one axial end face of the ring housing block 40. The pressure collecting groove 58 is in this case formed completely circumferentially with a second radius on the other axial end face of the ring housing block 40. The first radius and the second radius differ from one another. For example, the first radius is smaller than the second radius, or vice versa.In this case, a suction through-bore 56 extends from the suction collecting groove 54 parallel to the pump axis A to the other axial end face of the annular housing block 40, on which a suction collecting plate 50 is arranged. A pressure through-bore 60 extends from the pressure collecting groove 58 parallel to the pump axis A to one end face of the annular housing block 40, on which a pressure collecting plate 44 is arranged. REFERENCE SYMBOL 10 Suction connection 12 Pressure connection 14 Pump element 16 Pump shaft 18 eccentric 20 Suction inlet 22 Pressure output 24 high-pressure resistant pressure pipe structure 26 high-pressure resistant suction line structure 28 Housing block 30 separate piping arrangement 32 T-piece 33 Pipe section 34 Suction manifold section 36 separate pressure manifold arrangement 38 Return spring 40 ring housing block 42 mounting hole 44 Pressure collection plate 46 Pressure input 48 mounting hole 50 suction collection plate 51 sealing sheet 52 Suction riser section 53 internal management structure 54 Suction collecting groove 56 Suction through hole 58 Pressure collecting groove 60 pressure through hole 62 Collective recess 64 Riser recess 66 Mounting recess 68 Sealing element 70 housing space 100 - 400 Radial piston pump A pump axis S mirror plane T additional mirror plane

Claims

[1] Radial piston pump (100 - 400) for pumping high-pressure fluid, wherein the radial piston pump (100 - 400) comprises a suction port (10), a pressure port (12), several pump elements (14), a pump shaft (16) defining a pump axis (A), and an eccentric (18), wherein each pump element (14) comprises at least one suction inlet (20) and at least one pressure outlet (22), wherein the pump shaft (16) is configured to drive the pump elements (14) via the eccentric (18) to pump the high-pressure fluid from the suction port (10) to the pressure port (12), wherein the radial piston pump (100 - 400) comprises a high-pressure resistant pressure line structure (24) that connects the pressure port (12) to the at least one pressure outlet (22) of each pump element (14), characterized by , that the radial piston pump (100 - 400) comprises a high-pressure resistant suction line structure (26) that connects the suction port (10) to the at least one suction inlet (20) of each pump element (14). [2] Radial piston pump (100 - 400) according to claim 1, characterized by , that the multiple pump elements (14) are arranged in at least two axial pump planes which differ from each other in their axial position with respect to the pump axis (A). [3] Radial piston pump (100 - 400) according to one of the preceding claims, characterized by , that the high-pressure resistant suction line structure (26) is formed at least partially by a separate piping arrangement (30). [4] Radial piston pump (100 - 400) according to one of the preceding claims, characterized by , that the high-pressure resistant suction line structure (26) is at least partially integrated into a housing of the radial piston pump (100 - 400). [5] Radial piston pump (100 - 400) according to one of the preceding claims, characterized by , that the high-pressure resistant suction line structure (26) comprises at least one suction collector section (34) and at least one suction riser section (52), wherein the at least one suction collector section (34) extends at least partially circumferentially with respect to the pump axis (A) and the at least one suction riser section (52) extends parallel to the pump axis (A). [6] Radial piston pump (100) according to one of the preceding claims, characterized by , that each pump element (14) is arranged in a separate housing block (28). [7] Radial piston pump (200 - 400) according to any one of claims 1 to 5, characterized by , that the multiple pump elements (14) are arranged in at least one ring housing block (40). [8] Radial piston pump (100 - 400) according to one of claims 5 to 7, characterized by, that at least one suction collection section (34) is formed by a separate piping arrangement (30). [9] Radial piston pump (100 - 400) according to claims 5 and 7, characterized by , that at least one suction manifold section (34) is formed in at least one separate manifold plate (50). [10] Radial piston pump (100 - 400) according to any one of claims 5 to 9, characterized by , that at least one suction riser section (52) is formed by a separate piping arrangement (30). [11] Radial piston pump (100 - 400) according to claims 5 and 7, characterized by , that the at least one suction collection section (34), in particular in the form of an at least partially circumferential suction collection groove (54), is integrated into the at least one ring housing block (40). [12] Radial piston pump (100 - 400) according to claims 7 and 8 or claim 11, characterized by, that the at least one suction riser section (52), in particular in the form of a suction through-bore (56), is integrated into the at least one ring housing block (40). [13] Radial piston pump (100 - 400) according to claims 11 and 12, characterized by , that each annular housing block (40) comprises three suction riser sections (52) in the form of suction through bores (56) and three suction collector sections (34) in the form of partially circumferential suction collector grooves (54), wherein each suction through bore (56) opens into a suction collector groove (54) on one side and opens into an axial end face of the annular housing block (40) on the other side. [14] Radial piston pump (100 - 400) according to one of the preceding claims, characterized by , that a mirror plane (S) is defined by the pump axis (A) and a suction riser section (52), wherein the high-pressure resistant suction line structure (26) is mirror-symmetric to the mirror plane (S). [15] Radial piston pump (100 - 400) according to one of the preceding claims, characterized by that the pump elements (14) do not include any return elements. [16] Radial piston pump (100 - 400) according to one of the preceding claims, characterized by that the pump shaft is arranged at least partially in a housing space of the radial piston pump, wherein the housing space is pressure-tight from the environment and a cleaning fluid, which differs from the fluid to be pumped, is contained in the housing space.

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