Pumping assembly, radial plunger pump and coffee machine

Abstract

The invention relates to a pumping assembly, a radial plunger pump and a coffee maker, the pumping assembly comprises a cylinder body, a plunger structure and a transmission mechanism, and the cylinder body is provided with a plurality of medium cavities arranged in the circumferential direction; the plurality of plunger structures are correspondingly and movably arranged in the plurality of medium cavities in a penetrating manner; the transmission mechanism is movably arranged in the cylinder body, the transmission mechanism comprises a transmission sleeve and an eccentric shaft, the periphery of the transmission sleeve is provided with abutting surfaces, the abutting surfaces and the plunger structures are correspondingly and oppositely arranged so as to abut against the corresponding plunger structures, and the eccentric shaft is rotatably arranged in the transmission sleeve in a penetrating mode so as to drive the transmission sleeve to do translational motion; the transmission sleeve comprises a base circle part and vertex transition parts, the outer contour of the base circle part is tangent to at least part of the abutting face, the multiple vertex transition parts are arranged on the periphery of the base circle part in a protruding mode, and each vertex transition part comprises a vertex, a first forming face and a second forming face, the first forming surface and the second forming surface are respectively partial areas of different abutting surfaces.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger pumps, in particular to a pumping assembly, a radial plunger pump and a coffee machine. BACKGROUND

[0002] As a core component of high-pressure fluid delivery, the plunger pump is widely used in industrial equipment. For traditional large hydraulic equipment, it has the characteristics of high pressure and large flow, and is less sensitive to instantaneous flow fluctuations. The design of traditional plunger pumps focuses on meeting the high pressure and large flow requirements of large equipment.

[0003] However, small electromechanical devices are sensitive to flow fluctuations. When the structural configuration of the traditional plunger pump is applied to small electromechanical devices, the phenomenon of flow fluctuation affecting the function of the electromechanical device easily occurs, which needs to be improved. SUMMARY

[0004] Therefore, it is necessary to provide a pumping assembly, a radial plunger pump and a coffee machine to solve the problem of poor stability of the pumping flow of the traditional plunger pump.

[0005] The first aspect of the present application provides a pumping assembly for a radial plunger pump, the pumping assembly comprising a cylinder body, a plunger structure and a transmission mechanism, the cylinder body having a plurality of medium cavities arranged in the circumferential direction; a plurality of the plunger structures are movably arranged in the plurality of medium cavities; the transmission mechanism is movably arranged in the cylinder body, the transmission mechanism comprising a transmission sleeve and an eccentric shaft, the transmission sleeve having a plurality of abutting surfaces on the outer periphery, a plurality of the abutting surfaces being arranged corresponding to a plurality of the plunger structures to abut the corresponding plunger structures, the eccentric shaft being rotatably arranged in the transmission sleeve, the rotation axis of the eccentric shaft being arranged eccentrically relative to the central axis of the transmission sleeve to drive the transmission sleeve to move in translation; wherein the transmission sleeve comprises a base circle portion and a vertex transition portion, the outer contour of the base circle portion being tangent to at least part of the abutting surface, a plurality of the vertex transition portions being protrudingly arranged on the outer periphery of the base circle portion, the vertex transition portion comprising a vertex and a first forming surface and a second forming surface located on different sides of the vertex in the circumferential direction, the first forming surface and the second forming surface being part of different abutting surfaces, respectively.

[0006] In one embodiment, the plunger structure has a rotatable rolling element, and the rolling element is in rolling engagement with the abutting surface.

[0007] In one embodiment, the abutting surface is recessed with an adaptive groove, and the rolling element is in rolling engagement with the inner wall of the adaptive groove.

[0008] In one embodiment, in the circumferential direction of the base circle portion, the adjacent vertices are sequentially connected to form a regular polygon.

[0009] In one of the embodiments, the abutting surface is any one of a flat surface, a concave surface or a convex surface.

[0010] In one of the embodiments, the outer contour of the base circle portion is tangent to all the abutting surfaces.

[0011] In one of the embodiments, the movement direction of each of the plunger structures is directed to the central axis of the cylinder body, and the included angle of the movement direction of any adjacent plunger structures is equal.

[0012] In one of the embodiments, the cylinder body has a movable cavity, the transmission sleeve is movably arranged in the movable cavity, the cross-sectional shape of the movable cavity is configured to be the same as the cross-sectional shape of the transmission sleeve, and the size of the movable cavity is greater than that of the transmission sleeve.

[0013] In one of the embodiments, the central axis of the cylinder body is a third axis, the cylinder body comprises a spliced body, the spliced body has the medium cavity for the plunger structure to pass through, a plurality of the spliced bodies enclose the movable cavity around the third axis, the central angle of each of the spliced bodies is equal, and the seams on both sides of each of the spliced bodies are asymmetric with respect to the movement direction of the plunger structure passing through the inside thereof.

[0014] In one of the embodiments, the movable cavity has a plurality of inner vertices, the central angle of any adjacent inner vertices is equal, the central angle of any adjacent seams is also equal, and around the central axis of the cylinder body, the plurality of seams as a whole deflects by a preset angle with respect to the plurality of inner vertices in a direction opposite to the rotation direction of the eccentric shaft.

[0015] In one of the embodiments, the transmission mechanism further comprises a bearing, the bearing is embedded in the transmission sleeve, and the eccentric shaft passes through the inner ring of the bearing.

[0016] In one of the embodiments, the pumping assembly further comprises a reset member, a plurality of the reset members are correspondingly arranged in a plurality of the medium cavities, and the reset member elastically abuts between the cavity wall of the medium cavity and the side of the plunger structure away from the transmission sleeve.

[0017] In one of the embodiments, the transmission sleeve comprises a plurality of first hook portions arranged in the circumferential direction, the first hook portion has a clamping groove, the plunger structure has a second hook portion, a plurality of the second hook portions are correspondingly clamped with a plurality of the clamping grooves, and at least part of the area of the clamping groove has the same extension path as the abutting surface in the circumferential direction of the base circle portion.

[0018] The second aspect of the present application further provides a radial piston pump comprising the pumping assembly as described above, the radial piston pump further comprising a driver connected with the transmission mechanism, and a medium conveying assembly in communication with the plurality of medium cavities respectively.

[0019] The third aspect of the present application further provides a coffee machine comprising the radial piston pump as described above.

[0020] In the pumping assembly described above, the eccentric shaft is rotatably arranged in the transmission sleeve, and the rotation axis of the eccentric shaft is arranged eccentrically relative to the central axis of the transmission sleeve, so that the transmission sleeve performs translational motion in the rotation plane of the eccentric shaft under the driving of the eccentric shaft. In this way, the abutting surface in the transmission sleeve and the piston structure always have a corresponding relationship, i.e., the same abutting surface is always used to drive the same piston structure to move. Further, the conventional sleeve comprises an apex transition portion located outside the base circle portion. Since the apex transition portion protrudes radially outward relative to the base circle portion, the first forming surface and the second forming surface of the apex transition portion can provide supplemental abutting action for the piston structure, thereby reducing the risk of unstable flow caused by large displacement variation of the piston structure before and after abutting against the limit position. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A simple diagram of an exemplary pumping assembly provided by an embodiment of the present application.

[0022] Figure 2 A side view of a radial piston pump provided by an embodiment of the present application.

[0023] Figure 3 A top view of a pumping assembly provided by an embodiment of the present application.

[0024] Figure 4 A schematic diagram of a pumping assembly provided by an embodiment of the present application. Figure 3 A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. A schematic diagram of a pumping assembly provided by an embodiment of the present application.

[0025] A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. Figure 5 A schematic diagram of a pumping assembly provided by an embodiment of the present application. Figure 4 A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application.

[0026] A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. Figure 6a A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application.

[0027] A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. Figure 6b A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application.

[0028] A schematic diagram of a transmission sleeve of a pumping assembly provided by an embodiment of the present application. Figure 7 A cross-sectional view of a pumping assembly, a carrier disc, and a driver of a radial piston pump provided by an embodiment of the present application along line A-A. Figure 2 A cross-sectional view of a pumping assembly, a carrier disc, and a driver of a radial piston pump provided by an embodiment of the present application along line A-A. A cross-sectional view of a pumping assembly, a carrier disc, and a driver of a radial piston pump provided by an embodiment of the present application along line A-A.

[0029] A cross-sectional view of a pumping assembly, a carrier disc, and a driver of a radial piston pump provided by an embodiment of the present application along line A-A. Figure 8Fig. 1 is an exploded view of a radial piston pump according to the present application. Figure 2 Fig. 2 is a perspective view of the radial piston pump of Fig. 1.

[0030] Figure 9 Fig. 3 is a simplified view of a cylinder of the pumping assembly of Fig. 1. Figure 3

[0031] Figure 10 Fig. 4 is a top view of the radial piston pump of Fig. 1. Figure 2

[0032] Figure 11 Fig. 5 is a cross-sectional view of the radial piston pump of Fig. 1 along the line B-B. Figure 10

[0033] Figure 12 Fig. 6 is a cross-sectional view of the media delivery assembly of the radial piston pump of Fig. 1 along the line C-C. Figure 10

[0034] Figure 13 Fig. 7 is an isometric view of a second end cap of the media delivery assembly of the radial piston pump of Fig. 1. Figure 2

[0035] ​​​​​10, radial piston pump; 20, pumping assembly; 30, carrier disc; 31, positioning pin; 40, driver; 50, medium conveying assembly; 51, inlet channel; 52, outlet channel; 60, eccentric wheel; 70, plunger piece; 100, cylinder body; 110, movable cavity; 111, inner vertex; 120, splicing body; 120a, first splicing body; 120b, second splicing body; 120c, third splicing body; 121, medium cavity; 122, communication hole; 123, plug-in part; 124, liquid guide hole; 125, second ring groove; 130, joint; 200, plunger structure; 210, rolling piece; 220, plunger body; 221, clamping cavity; 230, second hook part; 240, first ring groove; 300, transmission mechanism; 310, transmission sleeve; 311, abutting surface; 312, base circle part; 313, vertex transition part; 313a, vertex; 313b, first forming surface; 313c, second forming surface; 314, fitting hole; 315, fitting groove; 316, first hook part; 317, buckling groove; 320, eccentric shaft; 330, bearing; 400, reset piece; 500, first end cover; 510, transfer cavity; 511, transfer groove; 520, liquid inlet hole; 530, liquid outlet hole; 540, third ring groove; 550, fourth ring groove; 560, fifth ring groove; 600, second end cover; 610, liquid inlet groove; 611, inlet; 620, liquid outlet groove; 621, outlet; 630, first interface piece; 640, second interface piece; 700, one-way member; 810, first sealing ring; 820, second sealing ring; 830, third sealing ring; 840, fourth sealing ring; 850, fifth sealing ring; O1, first axis; O2, second axis; O3, third axis; a, preset angle. DETAILED DESCRIPTION

[0036] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways beyond the specific embodiments described and claimed herein, and it is therefore intended that the present application not be limited to the embodiments disclosed but will include all embodiments falling within the scope of the appended claims.

[0037] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0038] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0040] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on" or "below" the second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0041] It is to be noted that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, it is to be understood that when an element such as a layer, film, region, or substrate is referred to as being "connected", "coupled", or "adjacent" to another element, it can be directly connected, coupled, or adjacent to the other element, or intervening elements can also be present. As used herein including the claims, "vertical", "horizontal", "up", "down", "left", "right", and the like shall relate to the application as it is oriented in the drawing figure. However, it is to be understood that the application can assume many orientations when in use and its

[0042] A conventional radial piston pump generally comprises a pumping assembly, a passage assembly, and a motor, the motor is connected with the pumping assembly to drive the pumping assembly to perform periodic motion. The pumping assembly is communicated with the passage inside the passage assembly, and the pumping assembly can alternately form positive pressure and negative pressure in the passage assembly when performing periodic motion, so as to achieve the purpose of pumping liquid. For example, Figure 1 The conventional pumping assembly comprises an eccentric wheel 60 and a piston 70, the eccentric wheel 60 performs eccentric rotation to drive the piston 70 to perform periodic radial motion, so as to alternately form positive pressure and negative pressure in the preset cavity. For example, Figure 1 As an example, the center point of the eccentric wheel 60 is P0, and the eccentric wheel 60 performs eccentric rotation around the P1 axis. Thus, the piston 70 is periodically pressed by the eccentric wheel 60 during the rotation of the eccentric wheel 60, so as to reciprocate in the radial direction, thereby alternately forming positive pressure and negative pressure in the preset cavity. For example, Figure 1 As shown in the figure, taking clockwise rotation as an example, when the eccentric wheel 60 reaches the position with the maximum eccentricity (i.e. the P2 point) to press the piston 70, the piston 70 is pressed to move to the maximum extent in the radial direction. The eccentric wheel 60 is further rotated to the position of the P3 point of the eccentric wheel 60 to press the piston 70. During this process, the piston 70 gradually moves to the inside of the radial direction along the arc segment P2P3. The present inventor finds that the piston 70 will immediately retreat after passing the P2 point. That is, during the movement of the piston 70 from the P2 point to the P3 point along the outer periphery of the eccentric wheel 60, the radial displacement of the piston 70 per unit time changes greatly, thereby causing the pumping flow of the piston pump to be unstable. Further research finds that the above-mentioned problem of unstable flow of the piston pump is mainly caused by the rotational motion of the eccentric wheel 60. It can be understood that both the above-mentioned eccentric wheel 60 and the conventional cam have a limit position (refer to the P2 point). Therefore, before and after the piston 70 moves to the limit position, the displacement per unit time changes greatly, thereby causing the stability of the pumping flow per unit time to be poor.

[0043] To solve the above problems, the application provides a pumping assembly, which comprises a plunger structure, a transmission sleeve and an eccentric shaft. The eccentric shaft is rotatably arranged in the transmission sleeve, and the rotation of the eccentric shaft is eccentric rotation. Thus, under the driving of the eccentric shaft, the transmission sleeve will move along a circular track. In the case of translational motion, a specific area (i.e. the abutting surface to be mentioned below) on the transmission sleeve is always used to abut the plunger structure. Thus, by adjusting the structure of the specific area, the displacement of the plunger structure before and after passing through the limit position can be stabilized, so as to improve the stability of the flow of the medium pumped by the pumping assembly. The pumping assembly provided by each embodiment of the application and the radial plunger pump and coffee machine to which the pumping assembly is applied will be described in detail below in combination with the drawings and specific embodiments.

[0044] Please refer to Figure 2 , Figure 2 A side view of a radial plunger pump 10 provided by an embodiment of the application is shown. The radial plunger pump 10 provided by the embodiment of the application has the characteristic of stable pumping flow, which is convenient for maintaining the pressure stability at the downstream module of the radial plunger pump 10. As one example, the radial plunger pump 10 can be used in a coffee machine, and the radial plunger pump 10 can be in communication with the heating and extraction module of the coffee machine, and is used to provide liquid to the heating and extraction module to form coffee liquid. As described above, the radial plunger pump 10 has the characteristic of stable pumping flow, so it is convenient to maintain the expected pressure (for example, the standard extraction pressure 9 Bar in the field of coffee machines) at the heating and extraction module, and to improve the extraction effect.

[0045] Please refer to Figures 2 to 4 , in combination with Figure 7 , an embodiment of the application provides a pumping assembly 20, which can be used in the radial plunger described in each embodiment to achieve the purpose of stable pumping flow. The pumping assembly 20 comprises a cylinder body 100, a plunger structure 200 and a transmission mechanism 300. The cylinder body 100 has a plurality of medium cavities 121 arranged in the circumferential direction. A plurality of plunger structures 200 are movably arranged in the plurality of medium cavities 121. The transmission mechanism 300 is movably arranged in the cylinder body 100 to periodically abut each plunger structure 200, so that the plunger structure 200 reciprocates in the corresponding medium cavity 121, forming alternating positive pressure and negative pressure in the medium cavity 121, so as to suck in and pump out the medium, achieving the purpose of pumping. It can be understood that the above-mentioned medium refers to the substance pumped by the pumping assembly 20, and the medium can be configured as liquid or gas according to the demand.

[0046] Further, the transmission mechanism 300 comprises a transmission sleeve 310 and an eccentric shaft 320. The transmission sleeve 310 has a plurality of abutting surfaces 311 on the outer periphery thereof, and the plurality of abutting surfaces 311 are arranged correspondingly and oppositely to the plurality of plunger structures 200 to abut the corresponding plunger structures 200. The eccentric shaft 320 is rotatably arranged in the transmission sleeve 310, and the rotation axis of the eccentric shaft 320 is arranged eccentrically relative to the central axis of the transmission sleeve 310 to drive the transmission sleeve 310 to move translationally. It should be noted that the movement of the eccentric shaft 320 is a circumferential rotation movement, and the outer peripheral wall of the eccentric shaft 320 has a relative movement with the inner wall of the transmission sleeve 310, so that the transmission sleeve 310 moves translationally in the rotation plane of the eccentric shaft 320 under the driving of the eccentric shaft 320. The difference lies in that, during the overall movement of the transmission mechanism 300, the abutting surface 311 in the transmission sleeve 310 always has a corresponding relationship with the plunger structure 200, that is, the same abutting surface 311 is always used to drive the same plunger structure 200 to move.

[0047] As Figure 4 , the transmission sleeve 310 comprises a base circle portion 312 and a vertex transition portion 313. The outer contour of the base circle portion 312 is tangent to at least part of the abutting surface 311, that is, the base circle portion 312 is approximately an eccentric wheel 60 in the prior art. A plurality of vertex transition portions 313 are protrudingly arranged on the outer periphery of the base circle portion 312. The vertex transition portion 313 comprises a vertex 313a and a first forming surface 313b and a second forming surface 313c located on different sides of the vertex 313a in the circumferential direction. The first forming surface 313b and the second forming surface 313c are part of different abutting surfaces 311, respectively. That is, the vertex transition portion 313 is a transition connection position of the circumferentially adjacent abutting surfaces 311. In combination with Figure 1 , Figure 4 and Figure 5 It can be understood that, when the area of the abutting surface 311 where the tangent point of the base circle portion 312 is located is used to abut the plunger structure 200 (that is, at the limit position), the plunger structure 200 moves to the radially outer side with the largest amplitude. As Figure 5 , the vertex transition portion 313 is further arranged outside the base circle portion 312 in the present application. Since the vertex transition portion 313 protrudes radially outward relative to the base circle portion 312, the first forming surface 313b and the second forming surface 313c of the vertex transition portion 313 can provide supplemental abutting action for the plunger structure 200 relative to the point P3 used to abut the plunger structure 200, thereby reducing the risk of unstable flow caused by the large displacement variation of the plunger structure 200 before and after the limit position abutment.

[0048] It is easy to understand that, as mentioned above, the vertex transition part 313 is a transition connection part of the circumferentially adjacent abutting surface 311. That is to say, for an abutting surface 311, it includes a first forming surface 313b of a vertex transition part 313, a region where the tangent point is located, and a second forming surface 313c of another vertex transition part 313, and the three are distributed in turn. Therefore, the first forming surface 313b and the second forming surface 313c respectively supplement the abutting of the plunger structure 200 before and after the limit position, and improve the stability of the movement of the plunger structure 200. It should be emphasized that the other limit position of the plunger structure 200 occurs at the P4 point shown in the figure abutting the plunger structure 200, which is not affected by the supplementary abutting of the first forming surface 313b and the second forming surface 313c. In other words, the arrangement of the present application does not premise to reduce the stroke of the plunger structure 200. Figure 5

[0049] In the present application, the eccentric shaft 320 is configured to drive the transmission sleeve 310 to move in translation, so that the abutting surface 311 always has a fixed alignment relationship with the plunger structure 200. Therefore, the first forming surface 313b and the second forming surface 313c of the abutting surface 311 can provide supplementary abutting action for the plunger structure 200, and reduce the risk of large displacement change of the plunger structure 200 before and after the limit position, which leads to unstable pumping flow.

[0050] It should be further pointed out that, since the transmission sleeve 310 can simultaneously abut the plurality of plunger structures 200 during the translation movement along the circular track, each vertex transition part 313 of the transmission sleeve 310 has a supplementary abutting action for each plunger structure 200. Therefore, under the drive of the transmission sleeve 310, the plurality of plunger structures 200 stably cooperate, which can greatly improve the stability of the pumping assembly 20 in pumping medium, and the pressure and flow pulsation of the output medium is extremely small. When it is applied to a coffee machine, it can provide a constant water flow for coffee extraction, and ensure the extraction effect.

[0051] In one embodiment, the outer contour of the base circle part 312 can be configured to be tangent to all abutting surfaces 311. Of course, in some embodiments, the base circle part 312 can also be configured not to have a tangent relationship with a small part of the abutting surface 311.

[0052] Please refer to Figure 3 and Figure 4 ​In one embodiment, the central axis of the transmission sleeve 310 is a first axis O1, and the rotation axis of the eccentric shaft 320 is a second axis O2. The second axis O2 is arranged eccentrically relative to the first axis O1, so that the eccentric shaft 320 rotates eccentrically relative to the first axis O1 to drive the transmission sleeve 310 to perform translational motion. It can be understood that the variation range of the displacement of the plunger structure 200 per unit time can be controlled by adjusting the eccentricity between the first axis O1 and the second axis O2, and the size of the protrusion of the vertex transition portion 313 from the base circle portion 312.

[0053] As Figure 5 Further, the central angle between each adjacent vertex 313a is equal with the first axis O1 as the center. That is, the angle span of each abutting surface 311 is the same, so that each plunger structure 200 receives the same abutting effect.

[0054] In one embodiment, in the circumferential direction of the base circle portion 312, the adjacent vertices 313a are sequentially connected to form a regular polygon, so that the plurality of abutting surfaces 311 are uniformly arranged in the circumferential direction around the central axis of the transmission sleeve 310 (i.e., the first axis O1), and the angle span is the same. Thus, the plurality of abutting surfaces 311 can provide the same abutting effect to each corresponding plunger structure 200, so that the pumping effect is smooth.

[0055] Please refer to Figure 3 and Figure 4 , in combination with Figure 6a and Figure 6b In one embodiment, the abutting surface 311 can be configured as any one of a plane, an inner concave arc surface, or an outer convex arc surface.

[0056] As one of the examples, when the abutting surface 311 is configured as a plane, the first forming surface 313b and the second forming surface 313c are both planes.

[0057] As one of the examples, when the abutting surface 311 is configured as an inner concave arc surface, the first forming surface 313b and the second forming surface 313c are also inner concave arc surfaces. At this time, the first forming surface 313b and the second forming surface 313c have a stronger complementary abutting effect (compared with the plane).

[0058] As one of the examples, when the abutting surface 311 is configured as an outer convex arc surface, the first forming surface 313b and the second forming surface 313c are also outer convex arc surfaces. At this time, the first forming surface 313b and the second forming surface 313c have a weaker complementary abutting effect (compared with the plane).

[0059] The configuration of the flat, concave or convex of the abutting surface 311 in the embodiments of the present application is not specifically limited and can be selected at will according to actual needs. For the convenience of description, the abutting surface 311 is configured as a flat in the following embodiments, and the outer contour of the transmission sleeve 310 can be configured as a regular polygon. For example, the outer contour of the transmission sleeve 310 can be configured as an equilateral triangle, a square, a regular pentagon, a regular hexagon, a regular heptagon, a regular octagon, and a regular nonagon, etc.

[0060] It should be emphasized that the effects of the specific shape of the components of the pumping assembly 20 are illustrated by using standard geometric shapes in the embodiments of the present application. In actual production and processing, the components of the pumping assembly 20 can be configured to have local features such as rounded corners and chamfers, which also belong to the scope of the present specification and are within the protection scope of the present patent.

[0061] As Figure 3 In one embodiment, the transmission mechanism 300 further comprises a bearing 330 embedded in the transmission sleeve 310, and the eccentric shaft 320 penetrates the inner ring of the bearing 330. By configuring the eccentric shaft 320 to drive the transmission sleeve 310 to move through the bearing 330, the risk of rotational movement of the transmission sleeve 310 due to contact friction during rotation of the eccentric shaft 320 can be reduced, and the alignment accuracy and stability of the abutting surface 311 and the plunger structure 200 can be improved.

[0062] It can be understood that the plurality of plunger structures 200 abut the transmission sleeve 310 from different areas in the circumferential direction, and the reaction force of the plurality of plunger structures 200 can also make the transmission sleeve 310 maintain translational motion without self-rotation.

[0063] The bearing 330 can be configured as a needle bearing or a ball bearing according to actual needs.

[0064] Please refer to Figure 3 and Figure 4 , in combination with Figure 9 In one embodiment, the movement direction of each plunger structure 200 is directed to the central axis of the cylinder body 100, and the included angle of the movement direction of any adjacent plunger structure 200 is equal. Further, the central axis of the cylinder body 100 is a third axis O3, and the plurality of plunger structures 200 can be uniformly distributed in the circumferential direction around the third axis O3. That is, taking the position of the third axis O3 as the center, the central angle between the extension directions of any adjacent plunger structures 200 is equal, and the central angle between the movement directions of any adjacent plunger structures 200 is equal. In this way, the stability of the pumping medium can be further improved.

[0065] Further, the third axis O3 can coincide with the second axis O2, that is, the eccentric shaft 320 rotates around the central axis of the cylinder body 100, so that each plunger structure 200 is subjected to approximately the same abutting action.

[0066] Referring to Figure 7 In one embodiment, the transmission sleeve 310 is provided with an accommodating hole 314, which is configured as a circular hole with the first axis O1 as the axis. The eccentric shaft 320 is arranged in the accommodating hole 314, and the eccentric shaft 320 is arranged to move the transmission sleeve 310 in different directions by abutting against different circumferential regions of the hole wall of the accommodating hole 314 during eccentric rotation. Further, the outer ring of the bearing 330 is clamped in the accommodating hole 314, and the eccentric shaft 320 abuts against the hole wall of the accommodating hole 314 through the bearing 330. Further, the accommodating hole 314 can be provided in the base circle portion 312.

[0067] Referring to Figure 3 In combination Figure 7 As described above, the transmission sleeve 310 as a whole moves along a circular path under the driving of the eccentric shaft 320. Therefore, for the plunger structure 200, the abutting surface 311 not only moves in the radial direction, but also has a tangential relative motion. In order to reduce the influence of the tangential force on the plunger structure 200, in one embodiment, the plunger structure 200 has a rotatable rolling element 210, which is used to roll with the abutting surface 311. In this way, by replacing the traditional sliding contact form with the rolling contact form of the rolling element 210 and the abutting surface 311, the tangential friction force when the transmission sleeve 310 abuts against the plunger structure 200 can be reduced, the friction and wear and noise can be reduced, and the plunger structure 200 can be more accurately kept in the radial motion. The accurate radial motion of the plunger structure 200 not only can improve the stability of the pumped medium, but also can reduce the risk of jamming and interference of the plunger structure 200 with the inner wall of the medium cavity 121, and reduce the risk of jamming of the plunger structure 200 with the inner wall of the medium cavity 121.

[0068] Further, the plunger structure 200 further includes a plunger body 220, which is arranged to extend in the radial direction. The rolling element 210 is embedded in one end of the plunger body 220 close to the transmission sleeve 310. As Figure 3 Further, one end of the plunger body 220 close to the transmission sleeve 310 is provided with a clamping cavity 221, and the rolling element 210 is movably embedded in the clamping cavity 221 to roll with the abutting surface 311.

[0069] Please continue to refer to Figure 3 and Figure 7 In one embodiment, the rolling element 210 can be configured as a spherical structure or a cylindrical structure, and the clamping cavity 221 is correspondingly configured as a spherical cavity or a cylindrical cavity.

[0070] Please continue to refer to Figure 3 and Figure 7In one embodiment, the abutting surface 311 is concave and provided with an adaptive groove 315, and the rolling member 210 is in rolling cooperation with the inner wall of the adaptive groove 315. The adaptive groove 315 can provide guidance and limiting effect for the rolling member 210, and reduce the stability of the cooperation between the plunger structure 200 and the abutting surface 311.

[0071] Please refer to Figure 8 , and combine Figure 11 In one embodiment, the pumping assembly 20 further comprises a plurality of reset members 400, and the plurality of reset members 400 are correspondingly arranged in the plurality of medium cavities 121. The reset member 400 is elastically arranged between the cavity wall of the medium cavity 121 and the side of the plunger structure 200 away from the driving sleeve 310. In other words, in the present embodiment, the driving sleeve 310 is used to drive the plunger structure 200 to move to the radial outside, so as to form a positive pressure in the medium cavity 121, and pump the medium in the medium cavity 121 out. The reset member 400 is used to drive the plunger structure 200 to move to the radial inside, so as to form a negative pressure in the medium cavity 121, and suck the medium into the medium cavity 121.

[0072] In one embodiment, the reset member 400 can be configured as a compression spring. It is easy to understand that the arrangement of the reset member 400 radially between the driving sleeve 310 and the plunger structure 200 will result in that the active cavity 110 needs to be configured to have a larger radial space for accommodating the reset member 400. The above-mentioned arrangement of the reset member 400 in the medium cavity 121 can relatively reduce the size of the active cavity 110, and the physical structure of the reset member 400 occupies less space in the medium cavity 121. In this way, the overall size of the pumping assembly 20 is reduced under the condition of meeting the reset requirement, which facilitates the miniaturization and integration design of the radial plunger pump 10, so that the radial plunger pump 10 can be applied to small integrated devices.

[0073] Please refer to Figure 7 In another embodiment, the driving sleeve 310 comprises a plurality of first hook portions 316 arranged in the circumferential direction, and the first hook portion 316 has a buckle groove 317. The plunger structure 200 has a second hook portion 230, and the plurality of second hook portions 230 correspondingly buckle with the plurality of buckle grooves 317. That is to say, the cooperation between the plunger structure 200 and the driving sleeve 310 is not only through the rolling cooperation between the rolling member 210 and the abutting surface 311, but also through the buckling cooperation between the second hook portion 230 and the buckle groove 317. The abutting surface 311 is used to push the plunger structure 200 to move to the radial outside, and the inner wall of the buckle groove 317 pulls the plunger structure 200 back to the radial inside by hooking the second hook portion 230, so as to reset it. That is to say, in the present embodiment, the driving force for the reciprocating movement of the plunger structure 200 is provided by the driving sleeve 310.

[0074] At least part of the area of the buckle groove 317 has the same extension path as the abutting surface 311 in the circumferential direction of the base circle part 312. That is, the buckle groove 317 allows the second hook part 230 to move along the abutting surface 311, so that the buckling fit of the second hook part 230 with the buckle groove 317 does not affect the smooth sliding of the rolling member 210 on the abutting surface 311, and the second hook part 230 and the rolling member 210 can move synchronously along the abutting surface 311.

[0075] In this embodiment, the plunger structure 200 is driven back by the groove wall of the buckle groove 317, which is a purely mechanical return mechanism, which can significantly reduce the risk of elastic fatigue, elastic attenuation and elastic failure that may occur when a spring is used for resetting, so that the working life of the pumping assembly 20 is longer, and the dynamic response and reliability are higher.

[0076] Please refer to

[0077] In some embodiments, the plunger structure 200 can also be driven back by hydraulic balance force return or magnetic force return.

[0078] Please refer to Figure 3 In an embodiment, the cross-sectional shape of the movable cavity 110 is configured to be the same as the cross-sectional shape of the transmission sleeve 310, and the size is larger than the transmission sleeve 310. As described above, the transmission sleeve 310 moves in a circular path, so configuring the cross-sectional shape of the movable cavity 110 to be the same as the cross-sectional shape of the transmission sleeve 310 and the size to be larger than the transmission sleeve 310 can make the movable cavity 110 occupy less space while meeting the free movement of the transmission sleeve 310, so as to facilitate the miniaturization and integration design of the pumping assembly 20 and even the radial plunger pump 10 as a whole.

[0079] Please refer to Figure 8 and Figure 9 In an embodiment, the cylinder body 100 includes spliced bodies 120, and the spliced bodies 120 have medium cavities 121 for the plunger structure 200 to pass through, that is, a plurality of plunger structures 200 correspondingly pass through a plurality of spliced bodies 120. The plurality of spliced bodies 120 enclose the movable cavity 110 around the third axis O3, and the central angles of the spliced bodies 120 are equal, so that the medium cavities 121 in each spliced body 120 can have approximately the same volume, and the plunger structure 200 can be provided with approximately the same support effect. Moreover, the seams 130 on both sides of each spliced body 120 are asymmetric with respect to the movement direction of the plunger structure 200 passing through them, so as to reduce the running instability.

[0080] Please refer to Figure 9The movement direction of the plunger structure 200 arranged in one splicing body 120 is shown as the label L. It can be understood that when the transmission sleeve 310 drives the plunger structure 200 to move, there is a tangential force between the two, which will be transmitted to the splicing body 120 and borne by it. As shown in Figure 9 The following three continuously distributed splicing bodies 120 are respectively referred to as the first splicing body 120a, the second splicing body 120b, and the third splicing body 120c. For the second splicing body 120b, when the two side seams 130 are symmetrical relative to the movement direction of the plunger structure 200, the forces exerted by the first splicing body 120a and the third splicing body 120c on the second splicing body 120b at the two seams 130 are also symmetrical to each other. Thus, as shown in Figure 9 K1 and K2, in the direction perpendicular to the movement direction of the plunger structure 200 in the second splicing body 120b (tangential direction t), the tangential components of the two forces cancel each other out; while in the direction along the movement direction of the plunger structure 200 in the second splicing body 120b (normal direction n, i.e., radial direction), the normal components of the two forces add up to each other, causing the force to concentrate on the normal direction n, which easily leads to deformation and loosening of the second splicing body 120b. As shown in Figure 9 K3 and K4, by configuring the two seams 130 to be asymmetrical, the components of the two forces in the tangential direction t cannot completely cancel each other out, and the normal component of the two forces is smaller than that in the symmetrical design. In this way, the force form of the splicing body 120 is diversified, and the risk of deformation and loosening of the splicing body 120 caused by the concentration of force in the same direction is reduced.

[0081] Further, as mentioned above, the cylinder body 100 is assembled from a plurality of splicing bodies 120, so that one plunger structure 200 is arranged in one splicing body 120, forming an independent unit design, and any unit damage can be replaced independently, greatly reducing the maintenance cost and time.

[0082] Please refer to Figure 9 In one embodiment, the shape of the movable cavity 110 is the same as that of the transmission sleeve 310, so similarly, the movable cavity 110 has a plurality of inner vertices 111. The central angles of any adjacent inner vertices 111 are equal, and the central angles of any adjacent seams 130 are also equal. Around the central axis of the cylinder body 100, the plurality of seams 130 as a whole deflects by a preset angle a relative to the plurality of inner vertices 111 in the direction opposite to the rotation direction of the eccentric shaft 320. In this way, the ability of the splicing body 120 to bear the tangential force transmitted by the transmission sleeve 310 can be improved, and the overall structural stability can be improved. The above-mentioned preset angle a can be adaptively set according to requirements, for example, the preset angle a can be 5°, 10°, 15°, 20°, 25°, and 30°, etc.

[0083] It should be noted that the center angle, radial direction and circumferential direction of each feature in each embodiment of the present application are based on the center axis of the component where the feature is located.

[0084] Please refer to Figure 8 , and in combination Figure 2 In one embodiment, the radial piston pump 10 further comprises a driver 40 and a medium delivery assembly 50. The driver 40 is connected with the transmission mechanism 300 to drive the transmission mechanism to move. The movement provided by the driver 40 can be converted into reciprocating movement of the plurality of piston structures 200 through the transmission of the transmission mechanism 300, so as to achieve the purpose of pumping medium. The medium delivery assembly 50 is in communication with the plurality of medium cavities 121 respectively. The medium delivery assembly 50 can provide the medium cavities 121 with the medium required to be pumped, and receive the medium pumped out by the medium cavities 121.

[0085] Further, the driver 40 can be connected with the eccentric shaft 320 to drive the eccentric shaft 320 to rotate.

[0086] In one embodiment, the driver 40 can be configured as a brush DC motor, a brushless DC motor, a stepper motor and the like.

[0087] Please refer to Figure 8 In one embodiment, the radial piston pump 10 further comprises a carrier plate 30, and the pumping assembly 20 is arranged on the carrier plate 30. The plurality of spliced bodies 120 of the cylinder body 100 can have relatively fixed positions by being fixed on the carrier plate 30. The driver 40 is located on the side of the carrier plate 30 away from the pumping assembly 20. One of the output shaft of the driver 40 and the eccentric shaft 320 penetrates the carrier plate 30 to be connected with the other one, so as to achieve transmission.

[0088] As Figure 8 The side of the carrier plate 30 facing the pumping assembly 20 is provided with a plurality of positioning pins 31. The spliced body 120 has a positioning hole (not shown in the figure, the same below). The positioning pins 31 and the positioning hole are inserted and matched, so as to facilitate the positioning of the spliced body 120 relative to the carrier plate 30, and reduce the difficulty of alignment during installation.

[0089] The medium conveying assembly 50 is arranged at a side of the pumping assembly 20 away from the carrier disc 30. That is, the carrier disc 30, the pumping assembly 20 and the medium conveying assembly 50 are arranged in layers and stacked in sequence, which is simple in structure and regular in distribution, and can reduce the overall axial dimension of the radial piston pump 10. Further, the medium conveying assembly 50 can jointly clamp the pumping assembly 20 with the carrier disc 30, that is, the radial piston pump 10 does not need to be provided with an additional housing or the like for providing mounting support, but the pumping assembly 20 between the medium conveying assembly 50 and the carrier disc 30 can be clamped and fixed. In this way, the overall structure of the radial piston pump 10 is more compact, occupies less space, and is convenient for being applied to small electromechanical devices (for example, a coffee machine to be mentioned below).

[0090] As one of the examples, a threaded connector (not shown, the same below) can be arranged to pass through the medium conveying assembly 50 and the carrier disc 30 to lock and fix the two, so that the two stably clamp the pumping assembly 20. Further, each splicing body 120 has at least one through hole 122, which is located in the solid area of the splicing body 120, that is, it is not communicated with the medium cavity 121. The threaded connector passes through the through hole 122 to improve the effectiveness of locking the splicing body 120.

[0091] Of course, in other embodiments, the carrier disc 30, the pumping assembly 20 and the medium conveying assembly 50 can also be fixed in other ways, such as welding.

[0092] Please refer to Figure 11 In one embodiment, the driver 40 and the carrier disc 30 can also be directly locked together by a threaded connector. In this way, the overall structure of the radial piston pump 10 is more compact without additional connecting structure. Of course, in some embodiments, an intermediate transmission element, such as a gear transmission element or a belt transmission element, can also be arranged between the driver 40 and the eccentric shaft 320.

[0093] Please refer to Figure 11 Please refer to Figure 8 In one embodiment, the medium conveying assembly 50 has an inlet channel 51 and an outlet channel 52, which are respectively communicated with each medium cavity 121. In other words, the medium in the inlet channel 51 flows to each medium cavity 121 respectively, and the medium pumped out of each medium cavity 121 converges in the outlet channel 52 and is uniformly conveyed to the downstream module by the outlet channel 52.

[0094] Please refer to Figure 8 and Figure 11 In one embodiment, the splicing body 120 includes a liquid guide hole 124, which is communicated with the medium cavity 121 and is used to communicate the inlet channel 51 and the outlet channel 52 for the medium to flow in and out.

[0095] Referring to Figure 11 and Figure 12 In one embodiment, the medium conveying assembly 50 comprises a first end cover 500, the first end cover 500 is clamped with the cylinder body 100 to form a plurality of transfer cavities 510, and the plurality of transfer cavities 510 are in one-to-one correspondence with the plurality of guide holes 124 of the plurality of splicing bodies 120.

[0096] The cavity wall of the transfer cavity 510 is provided with an inlet hole 520 and an outlet hole 530, the inlet hole 520 is used for connecting the inlet flow channel 51 and the transfer cavity 510, and the outlet hole is used for connecting the outlet flow channel 52 and the transfer cavity 510.

[0097] The medium conveying assembly 50 further comprises a one-way component 700, the one-way component 700 is arranged at the inlet hole 520 and the outlet hole 530 for one-way conduction. As one of the examples, the one-way component 700 can be configured as any one of an umbrella valve, a cone valve, a ball valve and a flat plate valve. Of course, the one-way component 700 can also be configured as other components with one-way conduction function. It can be understood that when the medium cavity 121 and the transfer cavity 510 are in a negative pressure state, the one-way component 700 at the inlet hole 520 is opened, and the one-way component 700 at the outlet hole 530 is closed, so that the medium in the inlet flow channel 51 enters the medium cavity 121 and the transfer cavity 510. When the medium cavity 121 and the transfer cavity 510 are in a positive pressure state, the one-way component 700 at the outlet hole 530 is opened, and the one-way component 700 at the inlet hole 520 is closed, so that the medium in the medium cavity 121 and the transfer cavity 510 is pumped into the outlet flow channel 52.

[0098] In one embodiment, the one-way component 700 can also be integrated in the cylinder body 100, that is, the one-way component 700 can also be arranged in the medium cavity 121.

[0099] Please continue to refer to Figure 11 In one embodiment, the side of the first end cover 500 facing the cylinder body 100 is recessed to form a transfer groove 511, and the transfer groove 511 is closed by the cylinder body 100 to form the above-mentioned transfer cavity 510.

[0100] Further, the inlet hole 520 and the outlet hole 530 can be arranged on the bottom wall of the transfer groove 511, that is, the inlet hole 520 and the outlet hole 530 are arranged on the first end cover 500.

[0101] Please refer to Figure 11 , and Figure 8 In one embodiment, the splicing body 120 comprises a plug-in part 123, the plug-in part 123 is inserted with the transfer groove 511 to form the transfer cavity 510. By inserting the plug-in part 123 with the transfer groove 511, the tightness of the two can be improved, and the risk of leakage of the transfer cavity 510 can be reduced. Among them, the guide hole 124 can be extended and distributed in the plug-in part 123.

[0102] Please continue to see Figure 11 In one embodiment, the medium conveying assembly 50 further comprises a second end cover 600, which is arranged on the side of the first end cover 500 away from the cylinder body 100, and the first end cover 500 and the second end cover 600 are clamped to form the above-mentioned inlet flow channel 51 and outlet flow channel 52. Thus, in the first aspect, the inlet flow channel 51 and the outlet flow channel 52 are respectively formed by different structural members, and in the present embodiment, the first end cover 500 and the second end cover 600 are clamped to simultaneously form the two flow channels, so that the purposes of simplifying the structure, reducing the volume, and improving the compactness of the overall structure of the radial piston pump 10 can be achieved.

[0103] In the second aspect, the inlet flow channel 51 and the outlet flow channel 52 are integrally arranged between the two end covers, that is, the two flow channels are located on the same side of the pumping assembly 20, so that the transfer cavity 510 can be directly and effectively communicated with both of them at the same time, without the need for complex flow channel design. In the case of meeting the pumping flow demand, the volume of the splicing body 120 and the first end cover 500 can be configured to be smaller, facilitating integrated design.

[0104] In the third aspect, since the inlet flow channel 51 and the outlet flow channel 52 are located on the same side of the overall radial piston pump 10, the radial piston pump 10 can be connected with the upstream module and the downstream module at the same side (i.e. Figure 11 the top as shown), which is convenient for the layout of the external pipeline of the radial piston pump 10.

[0105] Please see Figure 11 and Figure 12 In one embodiment, the second end cover 600 has a first interface member 630 and a second interface member 640, the first interface member 630 is communicated with the inlet flow channel 51 and is used to communicate with the medium supply module such as a water tank. The second interface member 640 is communicated with the outlet flow channel 52 and is used to communicate with the downstream module (for example, the heating and extraction module of the coffee machine).

[0106] Please see Figure 12 and Figure 13 In one embodiment, the side of the second end cover 600 facing the first end cover 500 is recessed to be provided with an inlet liquid groove 610 and an outlet liquid groove 620, the inlet liquid groove 610 is closed by the first end cover 500 to form the inlet flow channel 51, and the outlet liquid groove 620 is closed by the first end cover 500 to form the outlet flow channel 52.

[0107] As Figure 13In one embodiment, one of the inlet flow channel 51 and the outlet flow channel 52 surrounds the other, i.e. one of the inlet liquid groove 610 and the outlet liquid groove 620 surrounds the other. In this way, on the one hand, the inlet liquid groove 610 and the outlet liquid groove 620 are both arranged in a ring shape, so that the extensions of both are distributed in the area where each splicing body 120 is located to communicate with each liquid guide hole 124. On the other hand, one of the inlet liquid groove 610 and the outlet liquid groove 620 surrounds the other, so that at each area in the circumferential direction, the inlet liquid groove 610 and the outlet liquid groove 620 both have sufficient radial spacing to facilitate fluid isolation operation (for example, the fourth sealing ring 840 to be mentioned below).

[0108] Further, the inlet flow channel 51 and the outlet flow channel 52 can be distributed in the form of concentric circles. The inlet liquid groove 610 and the outlet liquid groove 620 can be recessed in the first end cover 500 in the form of concentric circles.

[0109] Please refer to Figure 13 In one embodiment, the inlet liquid groove 610 has an inlet 611 that communicates with the first interface member 630. The outlet liquid groove 620 has an outlet 621 that communicates with the second interface member 640.

[0110] Please refer to Figure 7 and Figure 8 In one embodiment, the pumping assembly 20 includes a first sealing ring 810 and a second sealing ring 820, the first sealing ring 810 is sleeved on the plunger structure 200 and tightly abuts the inner wall of the medium cavity 121 to isolate the medium cavity 121 from the movable cavity 110. Further, the plunger body 220 or the inner wall of the medium cavity 121 can be configured to have a first annular groove 240 for installing the first sealing ring 810. Of course, in other embodiments, the plunger body 220 can be sleeved with a sealing sleeve to improve the sealing between the plunger structure 200 and the inner wall of the medium cavity 121.

[0111] Please refer to Figure 8 The second sealing ring 820 is sleeved on the plug-in part 123 and tightly abuts the inner wall of the transfer groove 511 or the end face of the first end cover 500 to seal the transfer cavity 510. Further, at least one of the outer circumferential wall of the plug-in part 123, the top wall of the splicing body 120, the bottom wall of the first end cover 500, and the inner wall of the transfer groove 511 is configured to have a second annular groove 125 for installing the second sealing ring 820.

[0112] Please refer to Figure 8 In combination with Figure 12 In one embodiment, the radial plunger pump 10 further includes a third sealing ring 830, a fourth sealing ring 840, and a fifth sealing ring 850, which are all arranged between the first end cover 500 and the second end cover 600 to improve the sealing of the inlet flow channel 51 and the outlet flow channel 52.

[0113] As one of the examples, the outflow channel 52 can surround the inflow channel 51. At this time, the third sealing ring 830 is arranged at the inner circle of the inflow channel 51, the fourth sealing ring 840 is arranged at the outer circle of the inflow channel 51 and at the inner circle of the outflow channel 52, and the fifth sealing ring 850 is arranged at the outer circle of the outflow channel 52. In this way, the inflow channel 51 and the outflow channel 52 are arranged with sealing rings on both the inner and outer sides in the radial direction, so as to reduce the risk of leakage of the flow channel.

[0114] Please refer to Figure 8 In one embodiment, the side of the first end cover 500 facing the second end cover 600 is recessed to be provided with a third ring groove 540, a fourth ring groove 550 and a fifth ring groove 560, the distribution positions of which correspond to the third sealing ring 830, the fourth sealing ring 840 and the fifth sealing ring 850, for mounting the sealing rings.

[0115] It should be noted that the sealing means at each position is described by taking the sealing ring as an example in each embodiment. In other embodiments, combined sealing members such as gaskets and seals can be used instead of the sealing rings.

[0116] In one embodiment, the first interface member 630 can be configured as a double-pyramid shape, which facilitates quick plug-in and self-tightening fixation of the water inlet hose without the need for additional pipe clamps. The second interface member 640 can be configured as an internally threaded pipe, so that the second interface member 640 can be threadedly connected with the downstream high-pressure pipeline, to improve the sealing performance at the interface and reduce leakage. Of course, the first interface member 630 and the second interface member 640 can also adopt other standard hydraulic connector forms such as quick connectors and sleeve connectors, which are not limited in the present application.

[0117] An embodiment of the present application also provides a coffee machine, which comprises the radial piston pump 10 described in each embodiment, and thus has all the features of the radial piston pump 10 and all the beneficial effects brought by each feature.

[0118] As one of the examples, the coffee machine comprises a water tank and a heating and extraction module (for example, a brewing head), the first interface member 630 can be used to communicate with the water tank to suck liquid in the water tank. The second interface member 640 is used to communicate with the heating and extraction module to provide liquid with stable flow and pressure to the heating and extraction module, so that the heating and extraction module can stably maintain the expected pressure and improve the extraction effect.

[0119] The technical features of the above-described embodiments can be combined in any manner. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0120] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A pumping assembly, characterized in that, The pumping assembly is used in a radial plunger pump, and the pumping assembly includes: A cylinder body having a plurality of media cavities arranged in a circumferential direction; A plunger structure, wherein multiple plunger structures are correspondingly and movably disposed in the multiple medium cavities; A transmission mechanism is movably disposed within the cylinder body. The transmission mechanism includes a transmission sleeve and an eccentric shaft. The outer periphery of the transmission sleeve has a bearing surface. Multiple bearing surfaces are arranged opposite to multiple plunger structures to bear against the corresponding plunger structures. The eccentric shaft is rotatably disposed through the transmission sleeve. The rotation axis of the eccentric shaft is eccentrically disposed relative to the central axis of the transmission sleeve to drive the transmission sleeve to translate. The transmission sleeve includes a base circle portion and a vertex transition portion. The outer contour of the base circle portion is tangent to at least a portion of the abutment surface. A plurality of vertex transition portions protrude from the outer periphery of the base circle portion. Each vertex transition portion includes a vertex and a first forming surface and a second forming surface located on different sides of the vertex in the circumferential direction. The first forming surface and the second forming surface are respectively partial regions of different abutment surfaces.

2. The pumping assembly according to claim 1, characterized in that, The plunger structure has a rotatable rolling element that rolls into contact with the abutment surface.

3. The pumping assembly according to claim 2, characterized in that, The abutment surface is recessed and has an adaptation groove, and the rolling element rolls in cooperation with the inner wall of the adaptation groove.

4. The pumping assembly according to claim 1, characterized in that, In the circumferential direction of the base circle, adjacent vertices are connected sequentially to form a regular polygon; and / or The abutting surface is any one of a plane, a concave arc surface, or a convex arc surface; and / or The outer contour of the base circle is tangent to all of the abutment surfaces; and / or The movement direction of each plunger structure points to the central axis of the cylinder, and the included angle between the movement directions of any adjacent plunger structures is equal.

5. The pumping assembly according to claim 1, characterized in that, The cylinder has a movable cavity, and the transmission sleeve is movably disposed in the movable cavity. The cross-sectional shape of the movable cavity is configured to be the same as the cross-sectional shape of the transmission sleeve, and its size is larger than that of the transmission sleeve.

6. The pumping assembly according to claim 5, characterized in that, The central axis of the cylinder body is a third axis. The cylinder body includes a splicing body. The splicing body has a medium cavity through which the plunger structure passes. Multiple splicing bodies surround the third axis to form the movable cavity. The central angles of each splicing body are equal, and the seams on both sides of each splicing body are asymmetrical with respect to the movement direction of the plunger structure passing through it.

7. The pumping assembly according to claim 6, characterized in that, The movable cavity has multiple inner vertices, and the central angles of any adjacent inner vertices are equal. The central angles of any adjacent joints are also equal. Around the central axis of the cylinder, the multiple joints are deflected by a preset angle relative to the multiple inner vertices in a direction opposite to the rotation direction of the eccentric shaft.

8. The pumping assembly according to claim 1, characterized in that, The transmission mechanism also includes a bearing, which is embedded in the transmission sleeve, and the eccentric shaft passes through the inner ring of the bearing.

9. The pumping assembly according to claim 1, characterized in that, The pumping assembly further includes reset members, a plurality of which are correspondingly disposed within a plurality of media cavities. The reset members are elastically held between the cavity wall of the media cavity and the side of the plunger structure away from the transmission sleeve; or The transmission sleeve includes a plurality of first hooks arranged in the circumferential direction, each first hook having a locking groove. The plunger structure has a second hook, and the plurality of second hooks are engaged with the plurality of locking grooves. In the circumferential direction of the base circle, at least a portion of the locking groove has the same extension path as the abutment surface.

10. A radial piston pump, characterized in that, The radial piston pump includes the pumping assembly as described in any one of claims 1 to 9, and the radial piston pump further includes: A driver, which is connected to the transmission mechanism; A media delivery assembly, wherein the media delivery assembly is respectively connected to a plurality of media cavities.

11. A coffee machine, characterized in that, The coffee machine includes the radial plunger pump as described in claim 10.

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