Lateral flow pipe of multi-stage sliding vane pump

Abstract

The utility model provides a side flow pipe of multistage sliding vane pump, including a plurality of mutually detachable connection pump body, the pump body includes the first-stage pump body, at least one intermediate-stage pump body and last-stage pump body that are connected in order, and the first-stage pump body, the at least one intermediate-stage pump body and the last-stage pump body are mutually independent and are all equipped with rotors equipped with sliding vanes, the rotors are sleeved with eccentric parts, and the eccentric parts are connected with the first-stage pump body and the at least one intermediate-stage pump body and the last-stage pump body. The inner wall of the eccentric part and the rotor are eccentrically arranged and form an eccentric cavity, the eccentric part is wrapped with a grading pump shell, an annular pump cavity is formed between the grading pump shell and the eccentric part, the eccentric part is provided with a plurality of flow distribution holes communicating the pump cavity with the eccentric cavity, side flow pipes are arranged outside the adjacent pump bodies, and the side flow pipes communicate with the pump cavities of the adjacent pump bodies correspondingly; the through-flow area of the side flow pipe is far larger than that of an interstage hole, local resistance of fluid transmission is reduced, and the transmission efficiency is improved; fluid does not directly wash the inner wall of the pump shell, damage of axial thrust to pump body connection is avoided, and the service life of the pump body is prolonged; the bending part of the side flow pipe realizes smooth steering of fluid, kinetic energy loss is reduced, and overall energy consumption is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of vane pump technology, specifically relating to a side flow pipe of a multi-stage vane pump. Background Technology

[0002] Traditional multistage vane pumps typically use built-in interstage orifices to transfer fluid between adjacent pump chambers. This design has significant drawbacks: severe energy loss: the small diameter of the interstage orifices easily generates eddies and local resistance as the fluid flows through, leading to decreased transfer efficiency; axial hydraulic pressure issues: high-speed fluid continuously scours the interstage orifices, generating axial thrust on the pump casing, exacerbating wear at pump body connections, causing vibration, and even structural failure; unreasonable flow path: the fluid ejected from the distribution orifice must make a sharp turn to enter the interstage orifice, and the turning loss further increases energy consumption. These problems limit the pressure regulation flexibility of multistage vane pumps, increase maintenance costs, and affect the long-term stability of the system. Therefore, there is an urgent need for a solution that can optimize the interstage transfer structure, reduce energy loss, and improve reliability. Utility Model Content

[0003] (1) Technical problems to be solved

[0004] This invention provides a side flow pipe for a multi-stage vane pump, aiming to solve problems such as low transmission efficiency.

[0005] (2) Technical solution

[0006] This utility model provides a side flow pipe for a multi-stage vane pump, including several pump bodies that are detachably connected to each other. Each pump body includes a first-stage pump body, at least one intermediate pump body, and a final-stage pump body connected in sequence. The output pressure can be linearly adjusted by increasing or decreasing the number of intermediate pump bodies. The first-stage pump body is provided with a pump outlet, and the final-stage pump body is provided with a pump inlet.

[0007] The first-stage pump body, intermediate-stage pump body, and final-stage pump body are independently arranged and each is equipped with a rotor including a sliding vane. An eccentric component is sleeved on the outside of the rotor. The inner wall of the eccentric component is eccentrically arranged with the rotor to form an eccentric cavity. A staged pump housing is wrapped around the eccentric component. An annular pump cavity is formed between the staged pump housing and the eccentric component. The eccentric component is provided with a plurality of flow distribution holes connecting the pump cavity and the eccentric cavity. Pump shafts extending outward are provided at both ends of the rotor. Adjacent pump shafts are axially detachably connected.

[0008] The pump body is provided with a side flow pipe on the outside of each adjacent pump body. The side flow pipe is connected to the pump chamber of each adjacent pump body. The pressurized fluid in the pump body is transmitted to the next adjacent pump body through the side flow pipe.

[0009] Furthermore, the side flow pipe is provided with two bends, and a horizontal flow section is provided between the two bends. One end of the bend is connected to the pump chamber of the pump body, and the other end is connected to the horizontal flow section.

[0010] Furthermore, the bending section has an arc-shaped structure to smoothly transition the fluid, and the diameter of the advection section is uniform.

[0011] Furthermore, the pump body has one or two through holes on the staged pump casing, and the through holes are respectively connected to the pump cavity and one end of the bend of the side flow pipe.

[0012] Furthermore, the intermediate pump body is provided with two through holes symmetrically arranged in the radial direction.

[0013] Furthermore, the through hole is provided with a first mounting position, and one end of the bent portion of the side flow pipe is provided with a second mounting position corresponding to the first mounting position. The first mounting position and the second mounting position are connected by bolts for sealing and fixing.

[0014] Furthermore, the eccentric component is provided with two sets of flow distribution holes, which are symmetrically arranged on the peripheral wall of the eccentric component in the radial direction.

[0015] Furthermore, the through hole and the distribution hole are coaxially corresponding to each other to reduce fluid energy loss.

[0016] Furthermore, one of the adjacent pump shafts is provided with an outwardly extending protrusion, and the other is provided with an inwardly recessed groove, the protrusion and the groove being engaged with each other.

[0017] Furthermore, the first-stage pump body is provided with a front pump cover at the end away from the intermediate pump body, and the last-stage pump body is provided with a rear pump cover at the end away from the intermediate pump body. Several fixing rods are threadedly fixed between the front pump cover and the rear pump cover, and the three together form a rigid frame to resist axial hydraulic force.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] The flow area of ​​the side-flow pipe is much larger than that of the interstage orifice, which suppresses the generation of eddies, reduces local resistance to fluid transmission, and improves interstage transmission efficiency. The fluid no longer directly scours the inner wall of the pump casing, avoiding damage to the pump body connection caused by axial thrust, reducing vibration risk, and extending pump life. The bends in the side-flow pipe enable smooth fluid deflection, reducing kinetic energy loss caused by sharp turns and further reducing overall energy consumption. In summary, this design solves the interstage transmission bottleneck of traditional multistage pumps, and while achieving linear adjustment of output pressure, it improves system energy efficiency and reliability, providing a better solution for high-pressure and high-stability operating conditions. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 .

[0021] Figure 2 For the explosion of this utility model Figure 1 .

[0022] Figure 3 A cross-sectional view of this utility model Figure 1 .

[0023] Figure 4 For the explosion of this utility model Figure 2 .

[0024] Figure 5 This is a diagram of the side flow pipe component of this utility model.

[0025] Figure 6 This is a schematic diagram of the installation of the flow measuring tube of this utility model.

[0026] Figure 7 This is a schematic diagram of the rotor working principle of this utility model.

[0027] Figure 8 A cross-sectional view of this utility model Figure 2 .

[0028] Figure 9 This is the pump shaft connection state of this utility model. Figure 1 .

[0029] Figure 10 This is the pump shaft connection state of this utility model. Figure 2 .

[0030] Figure 11 This is a schematic diagram of the pump shaft snap-fit ​​groove installation of this utility model.

[0031] Figure 12 This is a schematic diagram of the structure of the present invention. Figure 2 .

[0032] Reference numerals: 1-First stage pump body, 11-Pump outlet, 12-Front pump cover, 13-First stage pump shaft, 2-Intermediate stage pump body, 21-Intermediate stage pump shaft, 3-Final stage pump body, 31-Pump inlet, 32-Rear pump cover, 33-Final stage pump shaft, 4-Rotor, 41-Sliding vane, 42-Sliding groove, 43-Volume cavity, 5-Eccentric component, 51-Eccentric cavity, 52-Flow distribution hole, 6-Stage pump casing, 61-Pump cavity, 62-Through hole, 621-First mounting position, 7-Pump shaft, 71-Protrusion, 711-First snap-fit ​​groove, 72-Groove, 721-Second snap-fit ​​groove, 73-Snap-fit ​​block, 8-Side flow pipe, 81-Bend, 811-Second mounting position, 82-Horizontal flow section, 83-Bolt, 9-Fixing rod. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0034] like Figure 1-4 As shown, this utility model provides a side flow pipe for a multi-stage vane pump, including several pump bodies that are detachably connected to each other. The pump bodies include a first-stage pump body 1, multiple intermediate pump bodies 2 (the number of intermediate pump bodies 2 can be determined according to actual needs, and only one intermediate pump body 2 is shown in this article) and a final-stage pump body 3 connected in sequence. The top of the first-stage pump body 1 is provided with a pump outlet 13, and the side end of the final-stage pump body 3 is provided with a pump inlet 33. Liquid enters the pump from the pump inlet 33, flows through the final-stage pump body 3, the intermediate pump bodies 2 and the first-stage pump body 1 in sequence, and is finally discharged from the pump outlet 13.

[0035] The first-stage pump body 1, the intermediate-stage pump body 2, and the final-stage pump body 3 have similar structures, each including a rotor 4 with a sliding vane 41 installed. The rotor 4 is cylindrical, with a pump shaft 7 fixed through its center. When the pump shaft 7 rotates, it can drive the rotor 4 to rotate synchronously.

[0036] The rotor 4 is fitted with an eccentric member 5. The eccentric member 5 is annular, and the diameter of its inner wall is larger than the diameter of the rotor 4. The inner wall is eccentrically arranged with the rotor 4. The gap space formed by the eccentric arrangement of the two constitutes the eccentric cavity 51.

[0037] The eccentric component 5 is provided with a staged pump housing 6. The staged pump housing 6 is a cylindrical shell with an inner diameter larger than the outer diameter of the eccentric component 5, thereby enclosing the rotor 4 and the eccentric component 5 as a whole. At the same time, an annular pump cavity 61 is formed between the inner wall of the staged pump housing 6 and the outer wall of the eccentric component 5. It is worth noting that the first-stage pump body 1, the intermediate pump body 2 and the final-stage pump body 3 are each equipped with their own independent staged pump housing 6.

[0038] The eccentric component 5 is provided with a plurality of flow distribution holes 52 for connecting the pump chamber 61 and the eccentric chamber 51. It is worth noting that the pump chamber 61 and the eccentric chamber 51 can only be connected through the flow distribution holes 52.

[0039] In this embodiment, a side flow pipe 8 is provided on the outside of the adjacent pump body. The side flow pipe 8 has an internal flow channel and is connected to the pump chamber 61 of the adjacent pump body. This allows the pressurized fluid in the pump body to be transferred to the next adjacent pump body only through the side flow pipe 8. The side flow pipe 8 and its internal flow channel are both circular. This design makes the fluid transfer smoother and improves the transfer efficiency. In other embodiments, the side flow pipe 8 has a square shape and flow channel, or it can be square on the outside and circular on the inside, or circular on the outside and square on the inside, which can achieve the same effect.

[0040] In addition, a pump shaft 7 is fixedly connected to the center of the rotor 4. The pump shaft 7 passes through the rotor 4, the eccentric part 5, and the stage pump casing 6. The first-stage pump body 1, multiple intermediate pump bodies 2, and the final-stage pump body 3 are each equipped with their own independent rotor 4, eccentric part 5, stage pump casing 6, and pump shaft 7. These structural components are produced according to a unified standard and have universality. The difference between each stage of the pump body lies mainly in the subtle differences in the assembly structure.

[0041] Each pump body is coaxially connected in series via its respective pump shaft 7 to form a continuous transmission shaft. When the pump shaft 7 of the first-stage pump body 1 rotates, it drives all the pump shafts 7 connected in series to rotate synchronously, thereby driving the rotors 4 of each stage to rotate simultaneously. During this process, the eccentric part 5, the stage pump casing 6, and the side flow pipe 8 remain stationary and rotate relative to the rotating pump shaft 7 and rotor 4.

[0042] When the multi-stage vane pump is in operation, the fluid enters the final stage pump body 3 from the pump inlet 33, and after being pressurized, it enters the side flow pipe 8 connecting the final stage pump body 3 and the intermediate stage pump body 2. Then it enters the intermediate stage pump body 2. In the intermediate stage pump body 2, the fluid flows sequentially through one end of the pump chamber 61 and the distribution hole 52 into the eccentric chamber 5. Driven by the rotation of the rotor 4, the vane 41 transfers mechanical energy to the liquid, increasing its pressure. The pressurized liquid enters the other end of the pump chamber 61 through the distribution hole 52, and then flows into the pump body through the side flow pipe 8. The above process is repeated when the fluid flows through each stage pump body (intermediate stage pump body 2 and first stage pump body 1), and the pressure is continuously accumulated stage by stage. Finally, the fluid that reaches the required pressure is discharged from the pump outlet 13 of the first stage pump body 1, completing the pressurized delivery process.

[0043] In traditional multistage vane pumps, fluid is typically transferred between stages through one or more interstage holes on the contact surfaces of adjacent pump bodies. These holes connect adjacent pump chambers. However, this design has the following problems: First, eddies are easily generated when fluid flows through the small-diameter interstage holes, leading to energy loss and reduced transmission efficiency. Second, fluid scouring the interstage holes continuously applies axial hydraulic pressure to the pump casing, exacerbating casing wear and causing vibration, increasing the risk of connection failure or detachment between adjacent pump casings. Third, after the fluid is pressurized and ejected from the distribution hole 52, it needs to undergo a significant turn to enter the interstage holes, which results in significant additional energy loss.

[0044] To address the problems associated with traditional interstage orifice structures, this application proposes an innovative design: an external side flow pipe 8 is installed between adjacent pump bodies to replace the internal interstage orifice. The key advantages of this design are: firstly, significantly reduced eddy current losses and improved transmission efficiency: the diameter of the side flow pipe 8 is much larger than that of the traditional interstage orifice, increasing the flow area and significantly suppressing eddy current generation, thereby reducing energy loss during interstage transmission and making transmission smoother, thus improving overall transmission efficiency; secondly, effectively avoiding pump casing scouring and axial force problems: since the fluid no longer needs to flow through the... The interstage holes in the staged pump casing 6 eliminate the continuous direct scouring of the inner wall of the staged pump casing 6 by the fluid. This not only significantly reduces the wear rate of the pump casing, but also avoids the axial hydraulic pressure generated by scouring, thereby effectively reducing the risk of failure or detachment of adjacent pump casings due to vibration and structural fatigue. Thirdly, the optimized flow path reduces turning losses: the arrangement of the side flow pipe 8 provides a smoother flow path connection. After the fluid is pressurized and ejected from the distribution hole 52, it can enter the side flow pipe 8 more smoothly without having to make a nearly 90-degree sharp turn, which significantly reduces the local resistance and energy loss caused by the sudden change in flow direction.

[0045] In addition, this application adopts modular pressure customization, using a "first-stage pump body 1 + expandable intermediate pump body 2 + final-stage pump body 3" architecture. The output pressure is linearly adjusted by increasing or decreasing the number of intermediate pump bodies to achieve precise pressure adaptation. At the same time, each stage is equipped with an independent rotor 4, eccentric part 5, stage pump casing 6 and pump shaft 7, breaking the constraints of traditional integrated design. Furthermore, all pump body components are produced according to unified standards, which greatly reduces production costs and spare parts inventory, and supports rapid replacement of single stages during maintenance.

[0046] Specifically, such as Figure 5-6 As shown, in one embodiment of this utility model, the side flow pipe 8 is provided with two bends 81, and a horizontal flow section 82 is provided between the two bends 81. One end of each of the two bends 81 is connected to the pump chamber of the adjacent pump body, and the other end is connected to the horizontal flow section 82. The bends 81 are arc-shaped. This structure can effectively guide the fluid direction to change smoothly, significantly reduce the abrupt change in the flow channel cross section and the rapid change in flow direction, thereby greatly reducing the possibility of the fluid generating vortices at the bend and improving the smoothness of the flow. On the other hand, the arc-shaped structure makes the outer contour lines of the side flow pipe smooth and has a good visual effect. In other embodiments, the bends 81 can also be square structures, which can achieve the same effect.

[0047] Furthermore, the flow section 82 is a hollow cylindrical structure with a uniform diameter. This cylindrical structure design, on the one hand, eliminates local contraction or expansion by maintaining a constant flow channel cross-section, maximizing the flow cross-sectional area of ​​the fluid and helping to maintain a high flow volume. On the other hand, the uniform cylindrical flow channel provides the fluid with a low-resistance straight transmission path. Compared with areas with curved structures (such as the bend 81), the fluid flows more smoothly and the flow velocity distribution is more uniform in this flow section 82, significantly reducing the frictional resistance and local pressure drop in the flow channel, thereby achieving faster transmission and further reducing energy loss.

[0048] Specifically, such as Figure 7-8 As shown, in one embodiment of the utility model, each rotor 4 is provided with a plurality of sliding grooves 42 extending radially outward from the center. The sliding grooves 42 are rectangular grooves. The sliding plate 41, which is also rectangular in structure, can be placed in the sliding grooves 42 and can slide freely along the sliding grooves to the outside of the rotor 4. The friction between the sliding plate 41 and the sliding grooves 42 is extremely small. When the rotor 4 rotates under the drive of the pump shaft 7, the sliding plate 41 slides outward along the sliding grooves 42 under the action of centrifugal force until its outer end abuts against the inner wall of the eccentric member 5. At the same time, there are a total of 9 sliding plates 41 and corresponding sliding grooves 42, which are evenly distributed around the center of the rotor 4.

[0049] Furthermore, the inner wall of the eccentric component 5 of the pump body abuts against the outer wall of the rotor 4, making the eccentric cavity 51 appear as a crescent shape. The crescent-shaped structure of the eccentric cavity 51 includes symmetrical and asymmetrical types. The eccentric component 5 is provided with two sets of flow distribution holes 52. The two sets of flow distribution holes 52 are symmetrically arranged on the peripheral wall of the eccentric component 5 in the radial direction and are located at the two narrowest points of the eccentric cavity 51.

[0050] When the rotor 4 rotates, two adjacent sliding plates 41 and the inner wall of the eccentric member 5 together form a volume cavity 43. All the sliding plates 41 divide the eccentric cavity 51 into several such volume cavities 43. Since the eccentric cavity 51 is crescent-shaped, the volume of each volume cavity 43 changes continuously as the rotor 4 rotates.

[0051] Taking the intermediate pump body 2 as an example: the liquid enters the eccentric cavity 51 through the distribution hole 52 at the bottom of the eccentric component 5. When the volume chamber 43 moves from the bottom end to the side end of the eccentric cavity 51, its volume gradually increases. At this time, the volume chamber 43 is still connected to the distribution hole 52 at the bottom end. The increase in volume leads to a decrease in the pressure inside the cavity, thereby generating suction and drawing the liquid into the cavity.

[0052] As the rotor 4 continues to rotate, the volume chamber 43 moves from the side end of the eccentric chamber 51 to the top end. During this process, the volume of the volume chamber 43 gradually decreases, and the pressure inside the chamber increases accordingly. When the volume chamber 43 reaches the top end and connects with the distribution hole 52 there, its internal pressure is higher than the pressure outside the eccentric part 5 (pump chamber 61). This pressure difference generates thrust, which pushes the liquid from the volume chamber 43 into the pump chamber 61.

[0053] Specifically, such as Figure 6-8 As shown in one embodiment of this utility model, the stage pump casing 6 of the first-stage pump body 1 and the last-stage pump body 3 is provided with a through hole 62. The intermediate pump body 2 is provided with two through holes 62 symmetrically arranged in the radial direction. The through holes 62 are respectively connected to the pump chamber 61 and one of the bends 81 of the side flow pipe 8. The through holes 62 are coaxially corresponding to the distribution holes 52. This structural design allows the fluid to be pressed out from the distribution holes 52 after being pressurized by the rotor 4. At this time, the through holes 62 and the distribution holes 52 are directly opposite each other. The pressurized fluid directly enters the side flow pipe 8 through the through holes 62, reducing the stroke in the pump chamber 61 and improving the fluid transmission efficiency. Similarly, when the fluid enters the next stage pump body from the flow measuring pipe 8, it directly enters the distribution hole 52 that is directly opposite it through the through holes 62, and continues to be pressurized in the eccentric cavity 51.

[0054] Furthermore, a first mounting position 621 is provided outside the through hole 62, and a second mounting position 811 corresponding to and fitting with the first mounting position 621 is provided at one end of the bent portion 81 of the side flow pipe 8. Both the first mounting position 621 and the second mounting position 811 are provided with four corresponding screw holes. A bolt 83 is provided in the screw holes, which penetrates the second mounting position 811 and the first mounting position 621 at one time, so that the side flow pipe 8 is fixedly installed on the through hole 62 of the stage pump housing 6 and maintains sealing and stability.

[0055] Specifically, such as Figure 9-11 As shown, in one embodiment of this utility model, the pump shaft 7 includes a first-stage pump shaft 13, an intermediate pump shaft 21, and a final-stage pump shaft 33, respectively corresponding to the first-stage pump body 1, a plurality of intermediate pump bodies 2, and a final-stage pump body 3. The first-stage pump shaft 13 is provided with a protrusion 71 facing the intermediate pump shaft 21, and the final-stage pump shaft 33 is provided with a groove 72 facing the intermediate pump shaft 21. The two ends of the intermediate pump shaft 21 are respectively provided with a groove 72 facing the first-stage pump shaft 13 and a protrusion 71 facing the final-stage pump shaft 33. The protrusion 71 is inserted into the corresponding groove 72 and achieves a snap-fit ​​connection.

[0056] The end of the first-stage pump shaft 13 away from the intermediate pump shaft 21 is connected to a drive device. When the drive device drives the first-stage pump shaft 13 to rotate, the intermediate pump shaft 21 and the final-stage pump shaft 33 rotate synchronously through the cooperation of the protrusion 71 and the groove 72.

[0057] In other embodiments, the first-stage pump shaft 13 facing the intermediate pump shaft 21 can be the groove 72, and the last-stage pump shaft 33 facing the intermediate pump shaft 21 can be the protrusion 71. The two ends of the intermediate pump shaft 21 can be the protrusion 71 facing the first-stage pump shaft 13 and the groove 72 facing the last-stage pump shaft 33, respectively, which can achieve the above-mentioned effect.

[0058] In other embodiments, the detachable connection structure between adjacent pump shafts 7 can also be a spline coupling or a flange bolt connection, which can achieve the same effect.

[0059] Furthermore, such as Figure 11 As shown, the side end of the protrusion 71 is provided with a first engaging groove 711 extending toward its center, and the inner peripheral wall of the groove 72 is provided with a second engaging groove 721 extending outward. The center of the first engaging groove 711, the second engaging groove 721 and the protrusion 71 are located on the same straight line, and an engaging block 73 is embedded between the first engaging groove 711 and the second engaging groove 721. The engaging block 73 fills both grooves at the same time, thereby forming a reliable engaging structure.

[0060] The drive device drives the first-stage pump shaft 13 to rotate, and transmits torque through the snap-fit ​​structure (including snap-fit ​​block) between the protrusion 71 and the groove 72, so that the intermediate pump shaft 21 and the final pump shaft 33 rotate synchronously. The eccentric part 5 and the stage pump housing 6 remain stationary, forming a dynamic seal with the rotating parts.

[0061] Specifically, such as Figure 12 As shown, in one embodiment of this utility model, a front pump cover 14 is installed at the end of the first-stage pump body 1 away from the intermediate pump body 2, and a rear pump cover 34 is installed at the end of the last-stage pump body 3 away from the intermediate pump body 2. The front pump cover 14 and the rear pump cover 34 sandwich several pump bodies in the middle. At the same time, four fixing rods 8 are connected between the front pump cover 14 and the rear pump cover 34. These four fixing rods 8 together form a cavity for accommodating and supporting the assembled first-stage pump body 1, intermediate pump body 2 and last-stage pump body 3, forming a rigid frame to resist axial hydraulic force. The fixing rods 8 are fixedly connected to the front pump cover 14 and the rear pump cover 34 by threads.

[0062] The working principle of this utility model is explained in detail below:

[0063] Fluid enters from the pump inlet 31 of the final stage pump body 3, is pressurized by the rotor 4 and vane 41, and is then injected into the pump chamber 61 through the distribution hole 52. The external side flow pipe 8 connects adjacent pump chambers 61, replacing the traditional interstage orifice.

[0064] Interstage transfer: Pressurized fluid flows smoothly from the first-stage pump chamber through the bend 81 (arc transition) of the side flow pipe 8 into the horizontal flow section 82 (straight pipe of equal diameter), and then enters the intermediate pump chamber through the next bend 81;

[0065] Stepwise pressurization: The fluid repeats the process in each pump stage: pump chamber 61 → distribution hole 52 → eccentric chamber 51 (mechanical pressurization by sliding vanes) → distribution hole 52 → pump chamber 61 → side flow pipe 8, with the pressure of each stage increasing linearly;

[0066] Power transmission: The drive device drives the first-stage pump shaft 13 to rotate, and all the pump shafts 7 are linked by the snap-fit ​​structure of the protrusion 71 and the groove 72, driving the rotors 4 of each stage to rotate synchronously;

[0067] Frame compression resistance: The front pump cover 12, the rear pump cover 32, and the fixing rod 9 form a rigid frame to resist residual axial force and ensure the series stability of the pump body;

[0068] Finally, the high-pressure fluid is discharged from the outlet 11 of the primary pump, completing multi-stage pressurization. The side flow pipe 8 is externally mounted throughout, preventing the fluid from directly scouring the stage pump casing 6, thus achieving efficient and low-loss transmission.

[0069] The innovations of this invention are as follows: Significantly reduced energy loss: The flow area of ​​the side-flow pipe is much larger than that of the interstage orifice, suppressing eddy current generation, reducing local resistance in fluid transmission, and improving interstage transmission efficiency; Elimination of axial hydraulic pressure hazards: The fluid no longer directly scours the pump casing inner wall, avoiding damage to the pump body connection from axial thrust, reducing vibration risk, and extending pump life; Optimized fluid path: The bends in the side-flow pipe allow for smooth fluid deflection, reducing kinetic energy loss caused by sharp turns and further reducing overall energy consumption. In summary, this design solves the interstage transmission bottleneck of traditional multistage pumps, achieving linear adjustment of output pressure while improving system energy efficiency and reliability, providing a better solution for high-pressure, high-stability operating conditions.

[0070] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0071] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A side flow pipe for a multi-stage vane pump, characterized in that, The pump body includes several pump bodies that are detachably connected to each other. The pump body includes a first-stage pump body (1), at least one intermediate pump body (2) and a final-stage pump body (3) connected in sequence. The output pressure is linearly adjusted by increasing or decreasing the number of intermediate pump bodies (2). The first-stage pump body (1) is provided with a pump outlet (11) and the final-stage pump body (3) is provided with a pump inlet (31). The first-stage pump body (1), the intermediate-stage pump body (2) and the final-stage pump body (3) are independently arranged and each is equipped with a rotor (4) including a sliding vane (41). An eccentric part (5) is sleeved on the outside of the rotor (4). The inner wall of the eccentric part (5) is eccentrically arranged with the rotor (4) to form an eccentric cavity (51). A staged pump housing (6) is wrapped around the eccentric part (5). An annular pump cavity (61) is formed between the staged pump housing (6) and the eccentric part (5). The eccentric part (5) is provided with a plurality of flow distribution holes (52) connecting the pump cavity (61) and the eccentric cavity (51). Pump shafts (7) extending outward are provided at both ends of the rotor (4) in the axial direction. Adjacent pump shafts (7) are axially detachably connected. The adjacent pump bodies are provided with side flow pipes (8) on the outside. The side flow pipes (8) are respectively connected to the pump chambers (61) of the adjacent pump bodies. The pressurized fluid in the pump body is transmitted to the adjacent next-stage pump body through the side flow pipes (8).

2. The side flow pipe of a multi-stage vane pump according to claim 1, characterized in that, The side flow pipe (8) is provided with two bends (81), and a horizontal flow section (82) is provided between the two bends (81). One end of the bend (81) is connected to the pump chamber (61) of the pump body, and the other end is connected to the horizontal flow section (82).

3. The side flow pipe of a multi-stage vane pump according to claim 2, characterized in that, The bending section (81) has an arc-shaped structure for smooth fluid transition, and the diameter of the lateral flow section (82) is uniform.

4. The side flow pipe of a multi-stage vane pump according to claim 2, characterized in that, The graded pump casing (6) of the pump body has one or two through holes (62), which are respectively connected to the pump cavity (61) and one end of the bend (81) of the side flow pipe (8).

5. The side flow pipe of a multi-stage vane pump according to claim 4, characterized in that, The intermediate pump body (2) is provided with two through holes (62) arranged symmetrically in the radial direction.

6. The side flow pipe of a multi-stage vane pump according to claim 5, characterized in that, The through hole (62) is provided with a first mounting position (621), and one end of the bend (81) of the side flow pipe (8) is provided with a second mounting position (811) corresponding to the first mounting position (621). The first mounting position (621) and the second mounting position (811) are sealed and fixedly connected by bolts (83).

7. The side flow pipe of a multi-stage vane pump according to claim 4, characterized in that, The eccentric component (5) is provided with two sets of flow distribution holes (52), which are symmetrically arranged on the peripheral wall of the eccentric component (5) in the radial direction.

8. The side flow pipe of a multi-stage vane pump according to claim 7, characterized in that, The through hole (62) is coaxially corresponding to the distribution hole (52) to reduce fluid energy loss.

9. The side flow pipe of a multi-stage vane pump according to claim 1, characterized in that, One of the adjacent pump shafts (7) is provided with an outwardly extending protrusion (71), and the other is provided with an inwardly recessed groove (72). The protrusion (71) and the groove (72) are engaged with each other.

10. The side flow pipe of a multi-stage vane pump according to claim 1, characterized in that, The first-stage pump body (1) is provided with a front pump cover (12) at one end away from the intermediate pump body (2), and the last-stage pump body (3) is provided with a rear pump cover (32) at one end away from the intermediate pump body (2). Several fixing rods (9) are threadedly fixed between the front pump cover (12) and the rear pump cover (32), and the three together form a rigid frame to resist axial hydraulic force.

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