Plunger machine

Abstract

At least one embodiment of the present disclosure provides a plunger machine comprising: a housing having an interior space; and a cylinder having a plurality of plunger holes arranged at intervals in a circumferential direction around the rotation axis, each of the plurality of plungers being mounted in one of the plurality of plunger holes. The shell is provided with an outer peripheral side wall extending in the circumferential direction roughly, the cylinder body is at least partially arranged in an inner space defined by the outer peripheral side wall, the outer peripheral side wall is provided with a plurality of longitudinal reinforcing ribs, and the longitudinal reinforcing ribs extend in the direction parallel to the rotation axis roughly and protrude towards the inner space. The plurality of longitudinal reinforcing ribs are triangular in a cross section perpendicular to the rotation axis. The plunger machine has good vibration reduction performance and can reduce noise.

Description

Technical Field

[0001] The present disclosure relates to a plunger machine. Background Art

[0002] Plunger machines include plunger pumps or plunger motors. During operation, these machines generate fluid pulsation and mechanical vibration, which in turn causes noise, impacting the work environment and causing noise pollution. For example, plunger pumps are a crucial component of hydraulic systems. With the trend toward electrification of their drivers, their noise levels have become increasingly noticeable and prominent, making noise reduction increasingly important. Utility Model Content

[0003] The noise of plunger machines primarily stems from fluid pulsation and mechanical vibration. Vibration and noise reduction technologies primarily involve reducing the intensity of the excitation source and blocking the propagation path of the excitation source. This paper optimizes the design of the plunger machine's housing to reduce vibration transmission.

[0004] The present disclosure provides a plunger machine, comprising: a housing having an interior space; a cylinder having a plurality of plunger holes spaced apart in a circumferential direction about a rotation axis, with a plurality of plungers each mounted in one of the plurality of plunger holes. The housing has an outer peripheral sidewall extending generally in the circumferential direction, and the cylinder is at least partially disposed within the interior space surrounded by the outer peripheral sidewall. The outer peripheral sidewall is provided with a plurality of longitudinal reinforcing ribs extending generally parallel to the rotation axis and projecting toward the interior space. The plurality of longitudinal reinforcing ribs are triangular in shape in a cross-section perpendicular to the rotation axis.

[0005] For example, in some embodiments, the outer peripheral sidewall is further provided with a plurality of transverse reinforcing ribs extending substantially in the circumferential direction and protruding toward the interior space, wherein the transverse reinforcing ribs intersect with the longitudinal reinforcing ribs.

[0006] For example, in some embodiments, the transverse reinforcement ribs extend along a circular arc centered about a point on the axis of rotation.

[0007] For example, in some embodiments, the housing has an open end at one end along the rotation axis, and a bearing hole is provided at the other end for mounting a rotating shaft. The rotating shaft is mounted to the cylinder body to drive the cylinder body to rotate. A portion of the internal space adjacent to the bearing hole is used to accommodate a portion of the cylinder body, and this portion of the internal space is cylindrical.

[0008] For example, in some embodiments, when the longitudinal reinforcing rib extends from one side of the open end and terminates at the cylindrical portion of the inner space, and as the longitudinal reinforcing rib extends, the cross-sectional area of ​​the longitudinal reinforcing rib first increases and then decreases.

[0009] For example, in some embodiments, a portion of the interior space near the open end has a square cross-section, and transverse and longitudinal reinforcing ribs are provided at the transition portion between the square portion and the cylindrical portion. The housing is further provided with an intake port and an exhaust port, which are respectively provided on two sides corresponding to opposite sides of the square. The two transverse reinforcing ribs intersect with the two longitudinal reinforcing ribs to form a tic-tac-toe arrangement. Two tic-tac-toe arrangements are respectively provided on two sides of the interior space corresponding to the intake port and the exhaust port.

[0010] For example, in some embodiments, the two tic-tac-toe arrangements are axially symmetrical with respect to an axis of the square, where the axis is parallel to two opposite sides of the square.

[0011] For example, in some embodiments, the plunger machine further comprises a cover. The housing is further provided with a bolt hole for fixing the housing to the cover. The longitudinal reinforcement rib is aligned with the bolt hole in a direction parallel to the rotation axis.

[0012] For example, in some embodiments, the piston machine further includes: a swash plate mounted so as to be rotatable about a swing axis; a first adjustment assembly having a first piston, one end of which is coupled to the swash plate for adjusting the degree of swing of the swash plate; and a second adjustment assembly having a second piston, one end of which is coupled to the swash plate for adjusting the degree of swing of the swash plate. The housing includes a first pressure chamber and a second pressure chamber, the other end of the first piston and the other end of the second piston being inserted into the first pressure chamber and the second pressure chamber, respectively. In a cross section perpendicular to the axis of rotation, a line connecting the first pressure chamber and the second pressure chamber is substantially in the diagonal direction of the square portion, and the deviation from the diagonal direction is within a range of 0 to 15 degrees.

[0013] For example, in some embodiments, the deviation of the connecting line between the first pressure chamber and the second pressure chamber from the diagonal direction is in the range of 0 degrees to 10 degrees.

[0014] For example, in some embodiments, the housing is formed by casting and has an inner parting surface, and a line connecting the center of the first pressure chamber and the center of the second pressure chamber in a cross section perpendicular to the rotation axis is in the inner parting surface.

[0015] For example, in some embodiments, in a cross section perpendicular to the axis of rotation, both sides of the triangle of the longitudinal reinforcement rib are designed to be parallel to a vertical line or inclined toward the entity of the longitudinal reinforcement rib relative to the vertical line, and the vertical line is perpendicular to a line connecting the center of the first pressure chamber and the center of the second pressure chamber.

[0016] For example, in some embodiments, the plunger machine is a plunger pump or a plunger motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 shows an exploded perspective view of a plunger pump according to an embodiment of the present disclosure;

[0019] Figure 2 shows a longitudinal cross-sectional view of a plunger pump according to an embodiment of the present disclosure;

[0020] Figure 3 shows a perspective view of a swash plate assembly, a first adjustment assembly, and a second adjustment assembly according to an embodiment of the present disclosure;

[0021] Figure 4 shows a side view of a swash plate assembly, a first adjustment assembly, and a second adjustment assembly according to an embodiment of the present disclosure;

[0022] Figure 5 A perspective view of a swash plate of a plunger pump according to an embodiment of the present disclosure is shown;

[0023] Figure 6 A plan view showing a swash plate of a plunger pump according to an embodiment of the present disclosure;

[0024] Figure 7 A rear view of a cover of a plunger pump according to an embodiment of the present disclosure is shown;

[0025] Figure 8 A front view of a cover of a plunger pump according to an embodiment of the present disclosure is shown;

[0026] Figure 9 shows a front view of a plunger pump according to an embodiment of the present disclosure, with the cover removed;

[0027] Figure 10 A perspective view of a housing of a plunger pump according to an embodiment of the present disclosure is shown;

[0028] Figure 11 Another perspective view of a housing of a plunger pump according to another embodiment of the present disclosure is shown;

[0029] Figure 12 shows a cross-sectional view of a housing of a plunger pump according to an embodiment of the present disclosure;

[0030] Figure 13A and Figure 13BSchematic diagrams for illustrating the relationship between the shape of the internal space of a housing and the flow rate of a pressure medium in a plunger pump according to an embodiment of the present disclosure are respectively shown;

[0031] Figure 14 and Figure 15 Three-dimensional views of a core mold for casting a shell according to an embodiment of the present disclosure are respectively shown. DETAILED DESCRIPTION

[0032] Below, a plunger machine according to an embodiment of the present disclosure is described in detail with reference to the accompanying drawings. To make the objectives, technical solutions, and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them.

[0033] Therefore, the following detailed description of the embodiments of the present disclosure provided in conjunction with the accompanying drawings is not intended to limit the scope of the present disclosure as claimed, but merely represents selected embodiments of the present disclosure. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative effort are within the scope of protection of the present disclosure.

[0034] Unless the context otherwise defines, the singular includes the plural. Throughout the specification, the terms "including", "having", etc. are used herein to specify the presence of the features, numbers, steps, operations, elements, parts or their combination, but do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts or their combination.

[0035] In addition, even if ordinal terms such as “first”, “second”, etc. are used to describe various components, these components are not limited by these terms, and these terms are only used to distinguish one element from other elements.

[0036] In addition, in the description of the present invention, it should be understood that in the following description and the appended claims, the terms "longitudinal", "axial direction" or "axial direction" refer to the extension direction of the longest dimension of the modified feature, "radial" refers to the direction perpendicular to the axial direction or axial direction, "circumferential" refers to the direction around the axial direction or axial direction, and "cross-section" refers to the plane perpendicular to the "longitudinal", "axial" or "axial direction". For the convenience of description, the position of the mounting flange of the plunger machine is referred to as the front end or front, and the position opposite to the front end or front along the rotation axis of the rotating shaft is referred to as the rear end or rear, and the direction from the front end or front to the rear end or rear is referred to as the rear direction, and vice versa as the forward direction. However, it should be understood that the above-mentioned designations are merely for the convenience of description and are not intended to limit the scope of this application.

[0037] Figure 1 and Figure 2 1 and 2 show an exploded perspective view and a longitudinal cross-sectional view of a plunger pump according to an embodiment of the present disclosure. Figure 1 As shown, the plunger pump includes a pump housing, a rotating shaft 18, a swash plate assembly having a swash plate 13, a cylinder block 17, a plurality of plungers 16, a first adjustment assembly 14, and a second adjustment assembly 15. The swash plate assembly, cylinder block 17, a plurality of plungers 16, the first adjustment assembly 14, and the second adjustment assembly 15 are disposed in the pump housing. The pump housing includes a housing 12 and a cover 11.

[0038] like Figure 2 As shown, the cylinder block 17 is mounted within the housing 12. The cylinder block 17 is provided with a plurality of plunger holes 171. Each of the plurality of plungers 16 is mounted at one end within one of the plurality of plunger holes 171 through a cylindrical fit, allowing for longitudinal translation. The other ends of the plurality of plungers 16, extending beyond the plunger holes 171, are connected to plunger shoes 161 via a ball-and-socket structure. Through the plunger shoes 161, the plungers 16 abut against and slide on the working surface 133 of the swash plate 13. The swash plate 13 is mounted within the cover 11 so as to be pivotable relative to the rotation axis O, with its working surface 133 tilted relative to the rotation axis O. Therefore, when the rotating shaft 18 rotates the cylinder block 17 and the plungers 16 about the rotation axis O, the plungers 16 translate longitudinally within the plunger holes 171, transferring pressure medium. The pressure medium is ultimately transmitted through the port plate 172 and corresponding piping to equipment external to the plunger pump.

[0039] Figure 3-Figure 4 1 and 2 show a perspective view and a side view of a swash plate assembly, a first adjustment assembly 14, and a second adjustment assembly 15 according to an embodiment of the present disclosure. Figure 3-Figure 4 As shown, the first adjustment assembly 14 may be a return piston adjustment assembly, which includes a first piston 141 and a coil spring 143 that biases the first piston 141 toward the swash plate 13. The second adjustment assembly 15 may be a variable piston assembly, which includes a second piston 151. The first end of the first piston 141 is engaged with the first protrusion 1321 of the swash plate 13, and the first end of the second piston 151 is engaged with the second protrusion 1322 of the swash plate 13. The second end of the first piston 141 is inserted into the first pressure chamber 121 (see FIG. 1 ) provided in the housing 12. Figure 12 The second end portion of the second piston 151 is inserted into the second pressure chamber 122 provided in the housing 12 (see Figure 12When the first and second pressure chambers 121, 122 are respectively connected to a high-pressure medium (e.g., high-pressure oil), the first piston 141 experiences a thrust from the high-pressure medium across its pressure-bearing surface area, pushing the swash plate 13 to increase its degree of oscillation. The second piston 151 experiences a thrust from the high-pressure medium across its pressure-bearing surface area, pushing the swash plate 13 to decrease its degree of oscillation. Furthermore, the first piston 141 is subjected to a spring force generated by the compression of the coil spring 143, which acts to push the swash plate 13 to increase its degree of oscillation. Because the pressure-bearing surface area of ​​the end face of the first piston 141 in contact with the high-pressure medium is smaller than that of the end face of the second piston 151, the thrust of the first piston 141 is smaller than that of the second piston 151. The forces acting on the swash plate by the first and second pistons 141, 151, balance with the spring force of the coil spring 143 to determine the deflection angle of the swash plate 13. Therefore, the tilt angle of the swash plate 13 can be adjusted by varying the pressure of the high-pressure medium within the two pressure chambers, thereby adjusting the stroke of the multiple plungers 16.

[0040] Figure 5-Figure 6 1 and 2 show a perspective view and a plan view of the swash plate 13 of the plunger pump according to an embodiment of the present disclosure. Figure 5-Figure 6 As shown, the swash plate 13 includes a central hole 139 and a working surface 133. The rotating shaft 18 passes through the central hole. During operation, the plunger shoe 161 slides along a circular or elliptical path on the working surface 133. The swash plate 13 also includes a pair of supporting surfaces 131 on opposite sides of the working surface 133. The supporting surfaces 131 are arc-shaped in side view. A pair of corresponding supporting surfaces 1121 in the cover body 11 (see Figure 7 ) cooperate with the pair of bearing surfaces 131 of the swash plate 13 in a known manner, for example, by sliding engagement, to allow adjustment of the swash plate 13 for rotation about its swing axis S, thereby adjusting the inclination of the swash plate 13. Furthermore, the cooperation between the arcuate bearing surfaces 131 of the swash plate 13 and the corresponding bearing surfaces 1121 formed on the cover body defines the swing axis S.

[0041] Figure 7-Figure 8 1 and 2 respectively show a rear view and a front view of the cover 11 of the plunger pump according to an embodiment of the present disclosure. Figure 7-8 As shown, the cover body 11 is roughly in the shape of a rectangular parallelepiped and includes a flange portion 111 and a cover body portion 112. The flange portion 111 is used to connect with a standard flange to fix the plunger pump to other equipment in the use environment. The cover body portion 112 forms a part of the internal space of the pump housing, which is roughly square in shape in a cross section perpendicular to the rotation axis O, and defines a first axis A and a second axis B perpendicular to each other for determining the orientation of the pump housing of the plunger pump. The first axis A and the second axis B are in a plane perpendicular to the rotation axis O. It should be noted that, as Figure 7As shown, the square shape may include a rectangle, a square, or a diamond shape, and may have cut edges, such as chamfers or rounded corners forming the square shape, wherein the length of the cut edges is at least less than at least one pair of sides of the square shape. In addition, the sides of the square shape may not be strictly straight lines, but they correspond to the sides of the square shape of a standard flange.

[0042] Figure 9 FIG. 1 shows a front view of a plunger pump according to an embodiment of the present disclosure, wherein the cover 11 is removed. Figure 9 As can be seen in the figure, the portion of the housing 12 connected to the cover 11 includes a generally rectangular interior space having a first axis A and a second axis B. Unlike the prior art, the swash plate 13 is mounted so that its oscillation axis S is offset relative to the first axis A by an angle α about the rotation axis O of the rotary shaft. In other words, the oscillation axis S of the swash plate 13 is not parallel to either the first axis A or the second axis B and is located approximately diagonally within the interior space of the housing housing the swash plate. In some examples, this angle α is within a range of 30-60 degrees, or 0-15 degrees offset from the diagonal. Compared to prior art plunger pumps in which the oscillation axis S of the swash plate 13 is parallel to either the first axis A or the second axis B, the interior space of the pump housing, particularly the space housing the swash plate, is more efficiently utilized, and the swash plate 13 is more compactly arranged within the pump housing.

[0043] Return to reference Figure 5-Figure 6 The swash plate 13 includes a pair of protrusions 132 extending outward from the area where the working surface 133 is located, so as to be connected to the first adjustment assembly 14 and the second adjustment assembly 15 respectively. It should be understood that the connection includes not only direct connection, but also connection through an intermediate member or being operationally related. Figure 9 As shown, when the swash plate 13 is arranged as described above, the protruding portion 132 is arranged substantially along the diagonal direction of the inner space of the cover body 11 having a square cross section. Figure 4-6 As shown, the first protrusion 1321 of the pair of protrusions 132 engages with the first piston 141 of the first adjustment assembly 14, while the second protrusion 1322 engages with the second piston 151 of the second adjustment assembly 15. Therefore, since the first protrusion 1321 and the second protrusion 1322 are respectively the parts of the swash plate 13 that are farthest from the swash plate swing axis S, the first force arm L1 acting on the swash plate 13 by the first piston 141 and the second force arm L2 acting on the swash plate 13 by the second piston 151 are maximized (see Figure 9), which helps improve the response to adjustments in the inclination of the swash plate 13, that is, the response to adjustments in the stroke of the plunger 16. In the prior art, responses are often improved by increasing the difference in the pressure-bearing surface area between the first piston 141 and the second piston 151, or by increasing the first and second lever arms. Both approaches sacrifice space utilization within the pump housing, resulting in an increase in the volume of the plunger pump. In the disclosed embodiment, the swash plate 13's swing axis S is positioned by deflecting it relative to the axes A and B of a portion of the pump housing's interior space that accommodates the swash plate 13. This allows the first and second protrusions 1321 and 1322 of the swash plate 13 to extend diagonally within the generally square interior space of the pump housing. Without increasing the size of the pump housing, the protrusions 132 can be arranged within the maximum dimension of the pump housing's interior space, thereby increasing the first and second lever arms L1 and L2 and effectively utilizing the space within the pump housing. When the interior space has a rhombus-shaped cross-section, the swing axis is perpendicular to the direction along which the long diagonal of the rhombus extends. Therefore, the first lever arm L1 and the second lever arm L2 can be further increased to further effectively utilize the space in the pump housing.

[0044] Next, the housing 12 of a plunger pump according to an embodiment of the present disclosure will be described. The housing 12 can be used in the plunger pump described above, in which the swing axis S of the swash plate 13 is not parallel to either the first axis A or the second axis B, but is located approximately diagonally within the interior space of the pump housing 12 housing the swash plate 13. If desired, the housing 12 can also be used in a plunger pump in which the swing axis S of the swash plate 13 is parallel to either the first axis A or the second axis B, although the present disclosure is not limited thereto.

[0045] Figure 10 FIG. 1 shows a perspective view of a housing 12 of a plunger pump according to an embodiment of the present disclosure. Figure 11 Another perspective view of the housing 12 of the plunger pump according to an embodiment of the present disclosure is shown. Figure 12 A cross-sectional view of a housing 12 of a plunger pump according to an embodiment of the present disclosure is shown.

[0046] like Figure 10-12 As shown, the housing 12 of the plunger pump has an internal space formed by surrounding peripheral side walls, and the cylinder 17 is at least partially accommodated in the internal space. The suction port 1251 and the discharge port 1252 are respectively provided on the housing 12. One end of the housing 12 along the rotation axis O is an open end, and the other end has a bearing hole 129 for mounting the rotating shaft 18. The distribution plate 172 is installed in the internal space, near the other end of the housing 12. The distribution plate 172 has a suction opening 1721 and a discharge opening 1722. The pressure medium enters the plunger hole 171 from the suction port 1251 via the suction opening 1721, and is discharged from the plunger hole 171 to the discharge port 1252 via the discharge opening 1722.

[0047] A portion of the internal space near the open end is a square portion 127, whose cross section is square. Bolt holes (not shown in the figure) are provided at the square portion 127 to fix the housing 12 and the cover 11, thereby forming a closed space for accommodating the pressure medium. A portion of the internal space near the bearing hole 129 is a cylindrical portion 126, whose cross section is circular. The cylindrical portion 126 is used to accommodate a portion of the cylinder body 17. Compared with the square cross section of the housing 12 in the prior art, the cylindrical portion 126 helps to achieve lightweighting of the plunger pump and reduce energy consumption when the pressure medium circulates, which will be described in detail below.

[0048] Figure 13A and Figure 13B Schematic diagrams are shown for illustrating the relationship between the shape of the internal space of the housing 12 and the flow rate of the pressure medium in the plunger pump according to an embodiment of the present disclosure. Figure 13A The housing 12 , the cylinder 17 , and the gap G between the housing 12 and the cylinder 17 are shown in cross-section. Figure 13B The housing 12 having an inner space with a circular cross section, the housing 12' having an inner space with a rectangular cross section, the cylinder 17, and the gaps G, G' between the respective housings 12, 12' and the cylinder 17 are shown in cross section. Figure 13B In FIG. 1 , the flow rate of the pressure medium in the housing 12 ′ whose internal space has a rectangular cross section is indicated by a solid arrow, and the flow rate of the pressure medium in the housing 12 whose internal space has a circular cross section is indicated by a dotted arrow. Figure 13B As shown, since the cylinder 17 is circular, when the cross section of the internal space is circular, the cross-sectional area of ​​the space for accommodating the pressure medium in the housing 12 (i.e., the gaps G and G') and the cross-sectional area of ​​the housing 12 itself can be effectively reduced, thereby reducing the volume of the pressure medium in the housing 12 and the mass of the housing 12, thereby achieving a lightweight plunger pump. In addition, the pressure medium in the housing 12 will circulate as the cylinder 17 rotates, and the speed of the pressure medium near the inner side of the outer peripheral side wall of the housing 12 is zero, while the speed near the cylinder 17 is the largest. Figure 13B As shown, the circular housing 12 is conducive to reducing the kinetic energy of the pressure medium, thereby reducing the energy loss when the pressure medium circulates and reducing the heat dissipation of the plunger pump. In addition, since the kinetic energy of the pressure medium is reduced, it is helpful to reduce the fluid pulsation and mechanical vibration of the plunger pump.

[0049] In addition, in order to ensure that the housing 12 has sufficient strength and rigidity to suppress its deformation and vibration transmission when the plunger pump is running, the housing 12 according to the embodiment of the present disclosure is also provided with reinforcing ribs. Compared with simply increasing the wall thickness of the housing 12 to suppress its deformation and vibration transmission, the reasonable provision of reinforcing ribs can avoid the increase in the weight of the plunger pump and improve the power density ratio of the plunger pump. Figure 10-12 As shown, in this example, the shell 12 has six longitudinal reinforcing ribs 123 and four transverse reinforcing ribs 124. However, the present disclosure does not limit the number of the longitudinal reinforcing ribs 123 and the transverse reinforcing ribs 124.

[0050] The longitudinal reinforcing ribs 123 extend generally in an axial direction parallel to the rotation axis O and protrude toward the interior space. The transverse reinforcing ribs 124 extend generally in a circumferential direction and protrude toward the interior space. These transverse reinforcing ribs 124 and longitudinal reinforcing ribs 123 may be provided at a transition portion 128 between the square portion 127 and the cylindrical portion 126.

[0051] In an embodiment of the present disclosure, the longitudinal reinforcing ribs 123 have a triangular shape in a cross-section perpendicular to the rotation axis O. This triangular cross-section helps improve the housing 12's resistance to tensile deformation in the circumferential direction and flexural deformation in the radial direction. The longitudinal reinforcing ribs 123 extend from one side of the open end and terminate in a cylindrical portion 126 within the interior space. As they extend, the cross-sectional area of ​​the longitudinal reinforcing ribs 123 first increases and then decreases, effectively accommodating the transition from the square portion 127 to the cylindrical portion 126. Furthermore, because the cross-sectional area of ​​the longitudinal reinforcing ribs 123 first increases and then decreases, the longitudinal reinforcing ribs 123 form a pyramidal shape, which is more stable and further improves the strength and rigidity of the housing 12. Furthermore, the transverse reinforcing ribs 124 extend along a circular arc centered at a point on the rotation axis O, resulting in a nearly circular cross-section of the transition portion 128. This helps reduce energy consumption during pressure medium circulation and reduces fluid pulsation and mechanical vibration in the plunger pump.

[0052] The six longitudinal reinforcing ribs 123 are aligned with six of the eight bolt holes provided in the square portion in an axial direction parallel to the rotation axis O. Two of the four transverse reinforcing ribs 124 intersect with the two longitudinal reinforcing ribs 123 to form a crisscross arrangement, and the other two transverse reinforcing ribs 124 intersect with the other two longitudinal reinforcing ribs 123 to form another crisscross arrangement. In this example, the suction port 1251 and discharge port 1252 of the housing 12 are respectively provided on opposite sides of the housing 12, corresponding to opposite sides of the square cross-section of the square portion 127. The two crisscross arrangements are provided on opposite sides of the interior space corresponding to the suction port 1251 and discharge port 1252. Therefore, the combination of the longitudinal reinforcing ribs 123 and the transverse reinforcing ribs 124 can more effectively enhance the rigidity and strength of the housing 12 in the axial, circumferential, and radial directions, increase the natural frequency of vibration of the housing 12 in the corresponding directions, suppress deflection and vibration of the housing 12, and reduce noise. Preferably, the two tic-tac-toe arrangements are symmetrically arranged relative to the first axis A of the square portion 127 , wherein the two opposite sides are parallel to the first axis A.

[0053] The housing 12 can be connected to the reference Figure 1-9 The configuration of the embodiment shown is configured accordingly, in Figure 1-9 In the illustrated embodiment, the swing axis S of the swash plate 13 is not parallel to either the first axis A or the second axis B and is located approximately diagonally with respect to the interior space of the pump housing 12 that accommodates the swash plate 13. Therefore, in a cross-section perpendicular to the rotational axis O, the line connecting the first pressure chamber 121 and the second pressure chamber 122 of the housing 12 is approximately diagonally aligned with the square portion 127 of the housing 12, with the deviation from the diagonal direction ranging from 0 to 15 degrees.

[0054] The housing 12 may be formed by casting. Figure 14 and Figure 15 The figures show three-dimensional views of a core mold 2 for casting a shell 12 according to an embodiment of the present disclosure. As shown in the figure, the shell 12 has an inner parting surface C, and the core mold 2 can be split at the inner parting surface C and drafted in a direction substantially perpendicular to the inner parting surface C. In a cross section perpendicular to the rotation axis O, the two sides of the triangle of all six longitudinal reinforcing ribs 123 are designed to be parallel to a vertical line perpendicular to the inner parting surface C or to be inclined relative to the vertical line toward the longitudinal reinforcing rib 123 to facilitate drafting. For example, Figure 12As shown, the side 1231a of the longitudinal reinforcing rib 123a is perpendicular to the parting surface C, and the side 1232b of the longitudinal reinforcing rib 123b is perpendicular to the parting surface C, that is, parallel to the vertical line. The side 1231a and the side 1232b can also be inclined relative to the vertical line toward the entity of the corresponding longitudinal reinforcing rib 123a, 123b to form a certain draft angle. When the two tic-tac-toe arrangements are symmetrically arranged relative to the first axis A, in the cross section, the length of the two adjacent sides 1231a of the triangle of the pair of longitudinal reinforcing ribs 123 constituting the tic-tac-toe arrangement can be greater than the length of the other two sides 1232b. By appropriately setting the orientation of the various sides of the triangle in the cross section of the shell 12, it is helpful to simplify manufacturing and reduce manufacturing costs while improving the mechanical properties of the shell 12.

[0055] Although the present application has been described above based on a preferred embodiment of the present application, it should be understood that the present application is not limited to the specific structure described above, but includes any changes or variations made by those skilled in the art without departing from the essence of the above embodiments of the present application. In addition, although the present application is described above using a plunger pump as an example, it will be understood by those skilled in the art that the present application can also be applied to a plunger motor or other similar plunger machines. Therefore, the scope of the present disclosure is not limited by the above-described embodiments, but is only limited by the appended claims and their equivalents.

Claims

1. A plunger machine, characterized in that, include: a housing having an interior space; a cylinder having a plurality of plunger holes arranged at intervals in a circumferential direction around a rotation axis, a plurality of plungers each being installed in one of the plurality of plunger holes, The housing has an outer peripheral side wall extending substantially in the circumferential direction, the cylinder body is at least partially disposed in the inner space surrounded by the outer peripheral side wall, the outer peripheral side wall is provided with a plurality of longitudinal reinforcing ribs, the plurality of longitudinal reinforcing ribs extending substantially in a direction parallel to the rotation axis and protruding toward the inner space, The plurality of longitudinal reinforcing ribs are triangular in shape in a cross section perpendicular to the rotation axis.

2. The plunger machine according to claim 1, characterized in that The outer peripheral side wall is further provided with a plurality of transverse reinforcing ribs extending substantially in the circumferential direction and protruding toward the inner space, wherein the transverse reinforcing ribs intersect with the longitudinal reinforcing ribs.

3. The plunger machine according to claim 2, characterized in that The transverse reinforcement ribs extend along a circular arc centered on a point on the rotation axis.

4. The plunger machine according to claim 2, characterized in that One end of the housing along the rotation axis is an open end, and the other end is provided with a bearing hole for mounting a rotating shaft, and the rotating shaft is used to be mounted to the cylinder body to drive the cylinder body to rotate. A portion of the internal space adjacent to the bearing hole is used to accommodate a portion of the cylinder body, and the portion of the internal space is cylindrical.

5. The plunger machine according to claim 4, characterized in that When the longitudinal reinforcing rib extends from one side of the opening end and terminates at the cylindrical portion of the inner space, and as it extends, the cross-sectional area of ​​the longitudinal reinforcing rib first increases and then decreases.

6. The plunger machine according to claim 4, characterized in that The cross section of a portion of the inner space near the open end is square, and the transverse reinforcement ribs and the longitudinal reinforcement ribs are provided at a transition portion between the square portion and the cylindrical portion. The housing is further provided with an inlet and an outlet, which are respectively arranged on two sides corresponding to the two opposite sides of the square. The two transverse reinforcing ribs intersect with the two longitudinal reinforcing ribs to form a tic-tac-toe arrangement, The two crisscross arrangements are respectively provided on two sides of the internal space corresponding to the suction port and the discharge port.

7. The plunger machine according to claim 6, characterized in that The two tic-tac-toe arrangements are axially symmetrical with respect to an axis of the square, and the axis is parallel to the two opposite sides of the square.

8. The plunger machine according to claim 6, characterized in that Also includes a cover, The housing is also provided with bolt holes for fixing the housing to the cover. The longitudinal reinforcement ribs are aligned with the bolt holes in a direction parallel to the rotation axis.

9. The plunger machine according to claim 6, characterized in that The plunger machine also includes: a swash plate mounted so as to be rotatable about a swing axis; a first adjustment assembly having a first piston, one end of which is coupled to the swash plate for adjusting the degree of swing of the swash plate; and a second adjusting assembly having a second piston, one end of which is coupled to the swash plate for adjusting the swing degree of the swash plate; The housing includes a first pressure chamber and a second pressure chamber, the other end of the first piston and the other end of the second piston are respectively inserted into the first pressure chamber and the second pressure chamber, In a cross section perpendicular to the rotation axis, a line connecting the first pressure chamber and the second pressure chamber is substantially in a diagonal direction of the square portion, and a deviation from the diagonal direction is within a range of 0 to 15 degrees.

10. The plunger machine according to claim 9, characterized in that A connecting line between the first pressure chamber and the second pressure chamber is substantially in a diagonal direction of the square portion, and a deviation from the diagonal direction is within a range of 0 to 10 degrees.

11. The plunger machine according to claim 9, characterized in that The swing axis of the swash plate is substantially in a diagonal direction of the square portion, and a deviation from the diagonal direction is within a range of 0 to 15 degrees.

12. The plunger machine according to claim 9, characterized in that The housing is formed by casting and has an inner parting surface in which a line connecting the center of the first pressure chamber and the center of the second pressure chamber in a cross section perpendicular to the rotation axis is located.

13. The plunger machine according to claim 9, characterized in that In a cross section perpendicular to the axis of rotation, both sides of the triangle of the longitudinal reinforcement rib are designed to be parallel to a vertical line or to be inclined toward the entity of the longitudinal reinforcement rib relative to the vertical line, and the vertical line is perpendicular to a line connecting the center of the first pressure chamber and the center of the second pressure chamber.

14. The plunger machine according to any one of claims 1 to 13, characterized in that The plunger machine is a plunger pump or a plunger motor.

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