Embedded plunger pump and integrated system with same

Abstract

The utility model discloses an embedded plunger pump and an integrated system with the same, the embedded plunger pump comprises an embedded plunger pump and an integrated block, the embedded plunger pump comprises a shell, an end cover, components in the pump and a plurality of rotation-stopping and anti-falling mechanisms, and the rotation-stopping and anti-falling mechanisms are used for limiting relative rotation of the shell and the end cover and preventing the shell and the end cover from axially separating; a containing cavity is formed in the shell, the pump internal part is installed in the containing cavity, and an oil inlet and outlet is formed in the bottom of the end cover. The shell is provided with a first outer circle and a second outer circle, and the second outer circle is provided with an oil drainage opening communicated with the containing cavity. A mounting flange is further arranged on the right side of the shell and provided with direction recognition structure features and a plurality of mounting holes evenly distributed in the circumference, and an inserting groove used for mounting an embedded plunger pump is formed in the outer surface of the integrated block. According to the structure, the integrity of the plunger pump is kept, meanwhile, the strength of the integrated block is fully utilized, the small shell wall thickness is adopted, the diameter of the inserting groove is smaller, machining is easy, miniaturization and light weight of a hydraulic system are facilitated, and installation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of hydraulic components, more specifically to an embedded plunger pump and an integrated system with the same. BACKGROUND

[0002] In the prior art, for some application occasions that highly focus on miniaturization and light weight of hydraulic systems, such as EHA and other purposes, it is desired that the hydraulic pump and the hydraulic valve are highly integrated. The highest degree of integration is that the pump-valve integrated block serves as the pump body and the valve body, and the pump-valve components are installed in the integrated block. However, this not only leads to great difficulty in machining the integrated block and assembling and debugging the hydraulic system, but also makes it difficult for the hydraulic component manufacturer to control the performance and quality since the hydraulic components are supplied to the hydraulic system integrated manufacturer in the form of spare parts. Therefore, in practical applications, the plug-in pump and the plug-in valve are an effective way to improve the degree of integration and facilitate implementation.

[0003] The conventional plug-in pump is designed based on the plug-in valve, and the integrated block for installing the pump only provides oil passage for the pump. The pump itself is an independent component, and the shell end cover and its fasteners need to meet the force requirements of the pump itself. Therefore, the shell wall thickness of the pump is large, and the plug-in hole diameter required is large, which is not conducive to miniaturization and light weight.

[0004] CN 110500270 A discloses a bidirectional high-speed micro plunger pump with plug-in oil ports. The oil ports include an axially arranged pressure oil port (tail end), a radially arranged pressure oil port, and a radially arranged shell cavity oil discharge port. Three sealing rings are arranged on the outer circle of the pump body to separate the oil ports from the outside. When the pump is installed on the integrated block, the integrated block needs to be machined with a radial hole to communicate with the inside of the plug-in hole. To avoid damage to the sealing ring when the radial hole on the integrated block intersects with the inside of the plug-in hole during assembly, one way is to set a ring groove with a sealing ring installation guide chamfer at the intersection of the plug-in hole and the radial hole on the integrated block. Another way is to design the outer circle of the pump body as a stepped shape, i.e., the outer diameters of the three sealing rings gradually increase from the tail end to the front end. Correspondingly, the plug-in hole is also designed as a stepped shape, and a sealing ring installation guide chamfer is arranged at each step. Whether the plug-in hole adopts a ring groove with a sealing ring installation guide chamfer or a stepped plug-in hole, it will increase the difficulty of machining the plug-in hole. Further, when the axial oil port is under high pressure, the effective acting area of the pressure oil on the pump body is much larger than the area of the oil port itself. Therefore, the axial hydraulic pressure of the pump body caused by the high-pressure oil in the axial oil port is large. On the one hand, it will lead to an increase in the wall thickness of the pump shell to resist the axial hydraulic pressure, thereby increasing the outer diameter of the shell and the diameter of the plug-in hole. On the other hand, the specification of the connecting screw used to fix the pump to the integrated block also needs to be increased to resist the axial hydraulic pressure. These two aspects will lead to an increase in the size of the integrated block.

[0005] CN 204436711 U discloses a cylindrical plug-in plunger pump, only one sealing ring is arranged on the outer circle, and the processing difficulty of the plug-in hole is reduced. However, since the oil distribution end cover and the shell are connected by bolts, the bolt installation space causes the diameter of the plug-in hole to increase, which causes the increase of the size of the integrated block.

[0006] CN 109139451 A discloses an embedded plug-in hydraulic pump, two sealing rings are arranged on the outer circle of the shell, which increases the processing difficulty of the plug-in hole. Further, the shell 2 in the scheme is actually composed of two parts, the front half contains the pump internal parts, and the rear half is provided with oil ports. It is not difficult to understand that the shell is divided into two parts because the pump internal parts cannot be assembled if not divided into two parts. Although it is not mentioned in the document how the front half and the rear half of the shell are connected, it can be known based on common sense that the front half and the rear half need to be connected together by screws because the rear half is provided with a flow distribution window, and the front half and the rear half need to be aligned in the circumferential direction. In fact, from the drawings of the patent specification, it can be observed that the waist-shaped flow distribution window connecting the two oil ports and the slot screw for connecting the two parts are arranged on the outer circle of the shell. Figure 2 The threaded holes arranged on the peripheral wall of the shell inevitably cause the increase of the outer diameter of the pump, and the diameter of the plug-in hole is correspondingly increased.

[0007] Therefore, how to provide a new embedded plunger pump and an integrated system with the same, ensure the integrity of the plunger pump itself, fully utilize the strength of the integrated block itself, reduce the wall thickness of the pump shell, and achieve the purpose of reducing the diameter of the plug-in pump, is a problem that needs to be solved by those skilled in the art. Utility model content

[0008] Therefore, the utility model provides a new embedded plunger pump and an integrated system with the same, and aims at solving the technical problem that the design idea of the traditional plug-in pump is based on the structure of the original plunger pump and the utilization of the integrated block is too low.

[0009] An embedded plunger pump comprises a shell, an end cover, an anti-falling and anti-rotation mechanism, pump internal parts, a sealing ring and a pump shaft.

[0010] One end of the shell is provided with a cavity, and the other end is provided with a mounting flange, the mounting flange is provided with one or more than one circumferentially distributed screw through holes, the outer wall surface of the shell is provided with a first outer circle and a second outer circle, the diameter of the first outer circle is greater than that of the second outer circle, the first outer circle is provided with a sealing ring mounting ring groove, the second outer circle is provided with one or more than one radial oil leakage hole communicating with the cavity, and the side of the first outer circle close to the opening of the cavity is further provided with two or more than two circumferentially distributed radial holes.

[0011] The end cover is provided with a third outer circle and a fourth outer circle, the diameter of the third outer circle is greater than the diameter of the fourth outer circle, and the diameter of the third outer circle is less than or equal to the diameter of the first outer circle; the end face of the end cover is provided with a plunger pump oil inlet and a plunger pump oil outlet, the fourth outer circle is provided with circumferentially distributed threaded holes, the number of the threaded holes is the same as that of the radial holes and the positions of the threaded holes correspond to those of the radial holes one by one; the end cover is coaxially installed with the shell, and the fourth outer circle of the end cover is in clearance fit with the opening of the cavity;

[0012] The anti-disengagement and rotation prevention mechanism includes a cylindrical nut and a stud coaxially arranged at the bottom end of the nut and tightly connected, the stud is screw-connected with the threaded hole, the nut is in clearance fit with the radial hole, the anti-disengagement and rotation prevention mechanism is installed on the end cover in a radial direction through the shell, the relative rotation of the shell and the end cover is limited and the axial disengagement of the shell and the end cover is prevented, and the top end of the nut does not exceed the diameter of the first outer circle;

[0013] The pump internal component is installed in the cavity;

[0014] The sealing ring is installed in the sealing ring installation annular groove;

[0015] The outer end of the pump shaft is located at one end of the shell provided with the installation flange.

[0016] An integrated system includes an integrated block, the embedded plunger pump, the sealing ring two and the sealing ring three;

[0017] The outer surface of the integrated block is provided with a plug-in groove, and the embedded plunger pump is installed in the plug-in groove; the outer side of the slot of the plug-in groove is provided with a threaded bottom hole corresponding to the screw through hole; the side wall surface of the plug-in groove is provided with an oil leakage pipeline corresponding to the second outer circle; the groove bottom surface of the plug-in groove is provided with an oil inlet and an oil outlet, and the oil inlet and the oil outlet are respectively arranged opposite to the plunger pump oil inlet and the plunger pump oil outlet;

[0018] The sealing ring two is sealed at the joint of the oil inlet and the plunger pump oil inlet, and the sealing ring three is sealed at the joint of the oil outlet and the plunger pump oil outlet;

[0019] During installation, the end of the shell provided with the end cover is inserted into the plug-in groove, after the installation flange is installed in place, the end cover is in contact and abutment with the groove bottom surface of the plug-in groove, and the sealing ring is elastically sealed between the groove bottom surface of the sealing ring installation annular groove and the side wall surface of the plug-in groove.

[0020] Through the technical scheme, the utility model discloses a kind of embedded plunger pump, with the following beneficial effects: insertion slot is simple to process, make full use of the strength of integrated block itself, reduce the wall thickness of shell, so the size of insertion slot can be further small, and the integration is higher.

[0021] Preferably, the plunger pump inlet and the plunger pump outlet are respectively provided with sealing grooves one and two, and sealing rings two and three are respectively installed in the sealing grooves one and two and respectively elastically seal between the sealing grooves one and two and the groove bottom surface of the insertion slot.

[0022] Preferably, the side wall surface of the mounting flange is provided with a direction identification hole for determining whether the plunger pump inlet and the plunger pump outlet are respectively aligned with the inlet and the outlet.

[0023] Preferably, the mounting flange is a square flange plate, the number of screw through holes is four, and the four screw through holes are respectively arranged at four corner positions of the mounting flange.

[0024] Preferably, the embedded plunger pump can be bidirectionally rotated, and when the rotation direction of the embedded plunger pump is changed, the plunger pump inlet and the plunger pump outlet are exchanged with the docking positions of the inlet and the outlet of the integrated block to adapt to EHA and other purposes.

[0025] Compared with the prior art, the embedded plunger pump provided by the utility model has the following beneficial effects: the insertion slot is simple to process, makes full use of the strength of the integrated block itself, reduces the wall thickness of the shell, so the size of the insertion slot can be further small, and the integration is higher. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A three-dimensional schematic view of the embedded plunger pump provided by the utility model is shown in the drawings.

[0027] Figure 2 A half-sectional view of the embedded plunger pump provided by the utility model is shown in the drawings.

[0028] Figure 3 A local enlarged view of A in FIG. Figure 2

[0029] A local enlarged view of B in FIG. Figure 4 Figure 2 A local enlarged view of B in FIG.

[0030] ​Figure 5 The structural schematic diagram of the integrated block is provided in the utility model;

[0031] Figure 6 The partial sectional view of the integrated block and the embedded plunger pump under assembly is provided in the utility model;

[0032] Figure 7 For Figure 6 The partial enlarged view of C of

[0033] Figure 8 The partial enlarged view of D of Figure 6

[0034] Wherein: 1 - shell; 2 - end cover; 3 - anti-off rotation mechanism; 4 - pump internal parts; 5 - sealing ring; 6 - pump shaft; 7 - integrated block; 8 - sealing ring two; 9 - sealing ring three; 11 - cavity; 12 - mounting flange; 13 - first outer circle; 14 - second outer circle; 15 - sealing ring installation ring groove; 16 - radial oil leakage hole; 17 - radial hole; 21 - third outer circle; 22 - fourth outer circle; 23 - plunger pump oil inlet; 24 - plunger pump oil outlet; 25 - threaded hole; 31 - nut; 32 - stud; 70 - plug-in slot; 71 - oil leakage pipeline; 72 - oil inlet; 73 - oil outlet; 121 - screw through hole; 122 - direction identification hole; 231 - sealing groove one; 241 - sealing groove two. DETAILED DESCRIPTION

[0035] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not used to limit the scope of the utility model.

[0036] Referring to the drawings Figures 1-8 The utility model discloses an embedded plunger pump, including: shell 1, end cover 2, anti-off rotation mechanism 3, pump internal parts 4, sealing ring 5 and pump shaft 6.

[0037] The cavity 11 is arranged at one end of the shell 1, and the mounting flange 12 is arranged at the other end of the shell 1, the mounting flange 12 is provided with two or more than two screw through holes 121 that are circumferentially distributed, the outer wall surface of the shell 1 is provided with the first outer circle 13 and the second outer circle 14, and the diameter of the first outer circle 13 is greater than the diameter of the second outer circle 14, the sealing ring installation ring groove 15 is arranged on the first outer circle 13, the second outer circle 14 is provided with one or more than one radial oil leakage hole 16 that is communicated with the cavity 11, and the first outer circle 13 is provided with two or more than two radial holes 17 that are circumferentially distributed on the side close to the opening of the cavity 11.

[0038] ​The end cover 2 has a third outer circle 21 and a fourth outer circle 22. The diameter of the third outer circle 21 is larger than the diameter of the fourth outer circle 22, and the diameter of the third outer circle 21 is less than or equal to the diameter of the first outer circle 13. The end face of the end cover 2 has a plunger pump inlet 23 and a plunger pump outlet 24. The fourth outer circle 22 has circumferentially distributed threaded holes 25. The number of threaded holes 25 is the same as the radial holes 17, and their positions correspond one-to-one. The end cover 2 is coaxially mounted with the housing 1, and the fourth outer circle 22 of the end cover 2 forms a clearance fit with the opening of the cavity 11.

[0039] The anti-detachment and anti-rotation mechanism 3 includes a cylindrical nut 31 and a stud 32 coaxially arranged and fastened to the bottom end of the nut 31. The stud 32 is screwed to the threaded hole 25, and the nut 31 is clearance-fitted to the radial hole 17. The anti-detachment and anti-rotation mechanism 3 is radially installed on the end cover 2 through the housing 1, restricting the relative rotation of the housing 1 and the end cover 2 and preventing them from axially separating. The top of the nut 31 does not exceed the diameter of the first outer circle 13.

[0040] Pump internal component 4 is installed inside the cavity 11;

[0041] The sealing ring 5 is installed in the sealing ring mounting groove 15;

[0042] The extended end of the pump shaft 6 is located at the end of the housing 1 where the mounting flange 12 is provided.

[0043] An integrated system includes: an integrated block 7, the aforementioned embedded plunger pump, a second seal ring 8, and a third seal ring 9;

[0044] The outer surface of the integrated block 7 is provided with a cartridge groove 70, and the embedded plunger pump is installed in the cartridge groove 70; the outer side of the slot of the integrated block 7 is provided with a threaded bottom hole corresponding to the screw through hole 121; the side wall of the cartridge groove 70 is provided with an oil drain pipe 71 corresponding to the second outer circle 14; the bottom surface of the cartridge groove 70 is provided with an oil inlet 72 and an oil outlet 73, which are respectively arranged opposite to the plunger pump inlet 23 and plunger pump outlet 24.

[0045] Seal ring 28 is located at the junction of oil inlet 72 and plunger pump inlet 23, and seal ring 39 is located at the junction of oil outlet 73 and plunger pump outlet 24.

[0046] During installation, the end of the housing 1 with the end cap 2 is inserted into the insertion groove 70. After the mounting flange 12 is installed in place, the end cap 2 contacts and abuts against the bottom surface of the insertion groove 70. The sealing ring 5 is elastically sealed between the bottom surface of the sealing ring mounting groove 15 and the side wall surface of the insertion groove 70.

[0047] In order to further optimize the above technical scheme, the plunger pump oil inlet 23 and the plunger pump oil outlet 24 are respectively provided with a sealing groove one 231 and a sealing groove two 241 at the ports thereof, and the sealing ring two 8 and the sealing ring three 9 are respectively installed in the sealing groove one 231 and the sealing groove two 241 and are respectively elastically sealed between the sealing groove one 231 and the sealing groove two 241 and the groove bottom surface of the plug-in groove 70. Therefore, the sealing ring two 8 and the sealing ring three 9 are respectively installed in the sealing grooves of the plunger pump oil inlet 23 and the plunger pump oil outlet 24 and are elastically sealed with the groove bottom surface of the plug-in groove 70, further improving the sealing performance of the hydraulic system and avoiding oil leakage.

[0048] In order to further optimize the above technical scheme, the side wall surface of the mounting flange 12 is provided with a direction identification hole 122 for judging whether the plunger pump oil inlet 23 and the plunger pump oil outlet 24 are respectively aligned with the oil inlet 72 and the oil outlet 73. Therefore, the setting of the direction identification hole 122 can quickly judge whether the plunger pump oil inlet 23 and the plunger pump oil outlet 24 are aligned with the oil inlet 72 and the oil outlet 73 of the plug-in groove 70, improving the accuracy and efficiency of installation and avoiding installation problems caused by wrong direction.

[0049] In order to further optimize the above technical scheme, the mounting flange 12 is a square flange plate, the number of screw through holes 121 is four and the screw through holes 121 are respectively arranged at four corner positions of the mounting flange 12, and the number of threaded bottom holes is four and the threaded bottom holes are respectively arranged corresponding to the four screw through holes 121.

[0050] In some embodiments, the embedded plunger pump can be bidirectionally rotated, and when the rotation direction of the embedded plunger pump is changed, the plunger pump oil inlet 23 and the plunger pump oil outlet 24 are exchanged with the abutting positions of the oil inlet 72 and the oil outlet 73 of the integrated block 7 to adapt to EHA and other uses.

[0051] The specific principle and use method of the new embedded plunger pump and the integrated system provided by the embodiment are as follows:

[0052] During installation, one end of the shell 1 provided with the end cover 2 is inserted into the plug-in groove 70, the end cover 2 is in contact with and abuts against the groove bottom surface of the plug-in groove 70, and the mounting flange 12 is detachably connected with the outer surface of the integrated block 7, so that the axial force generated in the embedded plunger pump during operation acts on the groove bottom surface of the plug-in groove 70, the strength of the integrated block 7 itself is fully utilized, the wall thickness of the shell 1 can be further thinned, the overall volume of the embedded plunger pump is reduced, and the processing difficulty of the plug-in groove 70 is simplified.

[0053] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An in-line plunger pump characterized by, The utility model relates to a kind of embedded plunger pump, including: Shell (1), end cover (2), anti-off rotation mechanism (3), pump internal parts (4), sealing ring (5) and pump shaft (6); One end of the shell (1) is provided with a cavity (11), and the other end is provided with a mounting flange (12), the mounting flange (12) is provided with two or more screw through holes (121) distributed uniformly on the circumference, the outer wall surface of the shell (1) is provided with a first outer circle (13) and a second outer circle (14), and the diameter of the first outer circle (13) is greater than the diameter of the second outer circle (14), the first outer circle (13) is provided with a sealing ring mounting ring groove (15), the second outer circle (14) is provided with one or more radial oil drain holes (16) communicating with the cavity (11), and the first outer circle (13) is provided with two or more radial holes (17) distributed uniformly on the circumference on the side close to the opening of the cavity (11); The end cover (2) is provided with a third outer circle (21) and a fourth outer circle (22), the diameter of the third outer circle (21) is greater than the diameter of the fourth outer circle (22), and the diameter of the third outer circle (21) is less than or equal to the diameter of the first outer circle (13);The end surface of the end cover (2) is provided with a plunger pump oil inlet (23) and a plunger pump oil outlet (24), the fourth outer circle (22) is provided with a plurality of screw holes (25) distributed uniformly on the circumference, the number of the screw holes (25) is the same as that of the radial holes (17), and the positions correspond one by one;The end cover (2) is coaxially installed with the shell (1), and the fourth outer circle (22) of the end cover (2) is gap-fitted with the opening of the cavity (11); The anti-off rotation mechanism (3) includes a cylindrical nut (31) and a stud (32) coaxially arranged at the bottom end of the nut (31) and tightly connected, the stud (32) is screw-connected with the screw hole (25), the nut (31) is gap-fitted with the radial hole (17), the anti-off rotation mechanism (3) is installed on the end cover (2) by penetrating the shell (1) in the radial direction, to limit the relative rotation of the shell (1) and the end cover (2) and prevent the axial separation of the two, and the top end of the nut (31) does not exceed the diameter of the first outer circle (13); The pump internal parts (4) are installed in the cavity (11); The sealing ring (5) is installed in the sealing ring mounting ring groove (15); The outer end of the pump shaft (6) is located at the end of the shell (1) provided with the mounting flange (12).

2. An integrated system characterized by, The utility model relates to a kind of embedded plunger pump, including: Integrated block (7), the embedded plunger pump of claim 1, sealing ring two (8) and sealing ring three (9); The outer surface of the integrated block (7) is provided with a plug-in slot (70), and the plug-in plug-in pump is installed in the plug-in slot (70); The integrated block (7) is located outside the slot of the plug-in slot (70) and is provided with a threaded bottom hole corresponding to the screw through hole (121); The sidewall surface of the plug-in slot (70) is provided with an oil drain pipe (71) corresponding to the second outer circle (14); The slot bottom surface of the plug-in slot (70) is provided with an oil inlet (72) and an oil outlet (73), and the oil inlet (72) and the oil outlet (73) are respectively arranged opposite to the plug-in pump oil inlet (23) and the plug-in pump oil outlet (24); The sealing ring two (8) is sealed at the joint of the oil inlet (72) and the plug-in pump oil inlet (23), and the sealing ring three (9) is sealed at the joint of the oil outlet (73) and the plug-in pump oil outlet (24); During installation, one end of the shell (1) installed with the end cover (2) is inserted into the plug-in slot (70), and after the installation flange (12) is installed in place, the end cover (2) is in contact with the bottom surface of the plug-in slot (70), and the sealing ring (5) is elastically sealed between the bottom surface of the sealing ring installation ring groove (15) and the sidewall surface of the plug-in slot (70).

3. The integrated system of claim 2, wherein, The plug-in pump oil inlet (23) and the plug-in pump oil outlet (24) are respectively provided with a sealing groove one (231) and a sealing groove two (241) at the port thereof, and the sealing ring two (8) and the sealing ring three (9) are respectively installed in the sealing groove one (231) and the sealing groove two (241), and are respectively elastically sealed between the sealing groove one (231) and the sealing groove two (241) and the bottom surface of the plug-in slot (70).

4. The integrated system of claim 2, wherein, The sidewall surface of the installation flange (12) is provided with a direction identification hole (122) for judging whether the plug-in pump oil inlet (23) and the plug-in pump oil outlet (24) are respectively aligned with the oil inlet (72) and the oil outlet (73).

5. The integrated system of claim 2, wherein, The installation flange (12) is a square flange, and the number of the screw through holes (121) is four, which are respectively arranged at the four corner positions of the installation flange (12), and the number of the threaded bottom holes is four and is respectively arranged corresponding to the four screw through holes (121).

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