Novel variable pump without thrust bearing

Abstract

The novel variable pump comprises a pump shell, and a liquid inlet cavity and a liquid outlet cavity are formed in the two opposite sides of the pump shell respectively. The main shaft is rotationally connected to one side of the pump shell, one end of the main shaft is in transmission connection with a driving part, the main shaft is in key connection with a shaft sleeve, and a sliding stroke allowing the shaft sleeve to slide is formed on the main shaft; the impellers comprise the left impeller fixedly connected to one end of the shaft sleeve and the right impeller fixedly connected to the main shaft, and the left impeller and the right impeller are staggered to define an adjusting cavity; the sliding between the shaft sleeve and the main shaft is used for replacing the existing direct sliding between the bearing and the main shaft, and the left impeller is directly fixed on the shaft sleeve, so that the left impeller does not bear the axial thrust generated during rotation, and meanwhile, the bearing acting on the impeller can be prevented from directly rubbing with the main shaft; and the influence on variable control of the pump body due to transverse movement caused by abrasion of the bearing is avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field, specifically relating to a novel variable pump that does not require thrust bearings. Background Technology

[0002] Traditional variable displacement pumps typically use thrust bearings to support the main shaft rotation and bear the axial thrust generated during impeller operation. When the impeller is moved to control fluid flow, the thrust bearing usually slides directly against the main shaft. This sliding friction between the thrust bearing and the main shaft leads to energy loss and reduces pump efficiency. Under long-term high-load operation, the bearings are prone to wear and require frequent maintenance. Furthermore, traditional mechanical structures cannot adjust the axial clearance in real time according to different pump output conditions, resulting in low flow regulation accuracy, especially prone to pressure fluctuations under variable load conditions.

[0003] Therefore, there is an urgent need for a new structure that can control the axial displacement of the impeller, reduce friction, and improve dynamic response capability. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a new type of variable pump without thrust bearing.

[0005] The technical solution adopted in this utility model includes:

[0006] The pump casing has an inlet chamber and an outlet chamber formed on opposite sides;

[0007] The main shaft is rotatably connected to one side of the pump housing, and a drive component is provided at one end of the main shaft. A bushing is keyed on the main shaft, and a sliding stroke is formed on the main shaft for the bushing to slide.

[0008] The impeller includes a left impeller fixedly connected to one end of the bushing and a right impeller fixedly connected to the main shaft. The left and right impellers are interlocked to form an adjustment cavity.

[0009] An impeller drive is connected to the end of the bushing away from the left impeller, and is used to drive the bushing to move along the main shaft.

[0010] As a preferred embodiment of this invention, the inlet extends into the pump housing to form an inlet chamber, and the outlet extends into the pump housing to form an outlet chamber, both of which are connected to the regulating chamber.

[0011] As a preferred embodiment of this invention, the impeller drive component includes:

[0012] The mounting bushing is fixedly connected to the pump housing and located at the end of the main shaft away from the drive component;

[0013] The hydraulic drive component has its fixed end fixedly connected to the mounting bushing, and its output end abutting against one end of the bushing.

[0014] A hydraulic supply component is used to supply hydraulic pressure or return hydraulic pressure to the hydraulic drive component.

[0015] As a preferred embodiment of this invention, the hydraulic drive component includes:

[0016] A retaining ring is sleeved on the main shaft and fixedly connected to the main shaft;

[0017] A propulsion ring is connected to the fixed ring and can slide along the length of the main shaft; the output end of the propulsion ring abuts against the bushing.

[0018] A cavity-splitting ring is sleeved and fixedly connected to the fixed ring, and the fixed ring and the propulsion ring are separated by the cavity-splitting ring to form a left oil cavity and a right oil cavity.

[0019] As a preferred embodiment of this utility model, the hydraulic supply component includes:

[0020] The rotary joint has a fixed end that is fixedly connected to the mounting bushing, and a rotating end that rotates synchronously with the main shaft.

[0021] The left oil chamber supply pipe is formed inside the main shaft, and its two ends are respectively connected to the rotary joint and the left oil chamber;

[0022] The right oil chamber supply pipe is formed inside the main shaft, and its two ends are respectively connected to the rotary joint and the right oil chamber.

[0023] As a preferred embodiment of this invention, the impeller drive component further includes an oil return component, which comprises:

[0024] A leakage groove is formed between the mounting bushing and the hydraulic drive component, and the leakage groove is used to collect hydraulic oil leaking from the left oil chamber;

[0025] A return hole is provided on the push ring, which is used to collect hydraulic oil leaking from the right oil chamber;

[0026] A wool felt is attached to the retaining ring and serves as a seal between the retaining ring and the mounting bushing.

[0027] As a preferred embodiment of this utility model, the oil leakage return component further includes a return pipe formed inside the main shaft, one end of which is a closed end and the other end is connected to the rotary joint, and the return hole is connected to the return pipe.

[0028] As a preferred embodiment of this utility model, fixed upright plates are fixedly provided at both ends of the pump casing.

[0029] The beneficial effects of the utility model are as follows:

[0030] This invention is a novel variable displacement pump that eliminates the need for thrust bearings. It replaces the direct sliding between the existing bearing and the main shaft with the sliding between the bushing and the main shaft. Since the left impeller is directly fixed on the bushing, it is exempt from the axial thrust generated during rotation. At the same time, it avoids direct friction between the bearing acting on the impeller and the main shaft, and avoids lateral movement caused by bearing wear that would affect the variable displacement control of the pump body.

[0031] By setting a dual-chamber hydraulic control cylinder in the hydraulic drive component, the synchronous, equal, and staggered operation of hydraulic oil supply and return between the left and right oil chambers is used to drive the impeller to slide on the main shaft by pushing the bushing. At the same time, the synchronous rotation of the main shaft and the impeller can be maintained. By using the fixed connection between the impeller and the bushing, the lateral movement of the impeller is achieved by the movement between the bushing and the main shaft, thereby reducing the service life of the bearings acting on the impeller rotation. Attached Figure Description

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 This is a front sectional view of the structure of this utility model;

[0035] Figure 3 This is a side sectional view of the present invention.

[0036] Figure 4 This is a partial cross-sectional structural schematic diagram of the present invention.

[0037] In the diagram: 1. Pump casing; 2. Main shaft; 3. Impeller; 4. Impeller drive component; 11. Inlet; 12. Outlet; 13. Inlet chamber; 14. Outlet chamber; 15. Mounting bushing; 16. Fixed vertical plate; 21. Bushing; 22. Drive component; 31. Left impeller; 32. Right impeller; 33. Adjustment chamber; 41. Hydraulic drive component; 42. Hydraulic supply component; 43. Oil leakage return component; 411. Fixing ring; 412. Propulsion ring; 413. Dividing ring; 414. Left oil chamber; 415. Right oil chamber; 421. Rotary joint; 422. Left oil chamber supply pipe; 423. Right oil chamber supply pipe; 431. Leakage groove; 432. Return hole; 433. Felt; 434. Return pipe. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] The following is combined with Figures 1-4 This invention describes a novel variable displacement pump without thrust bearings, comprising:

[0041] The pump casing 1 has an inlet chamber 13 and an outlet chamber 14 on opposite sides, which are used for the input of fluid before pressurization and the output after pressurization.

[0042] The main shaft 2 is rotatably connected to one side of the pump housing 1, and a drive member 22 is provided at one end of the main shaft 2. A bushing 21 is keyed on the main shaft 2, and a sliding stroke is formed on the main shaft 2 for the bushing 21 to slide.

[0043] The impeller 3 includes a left impeller 31 fixedly connected to one end of the bushing 21 and a right impeller 32 fixedly connected to the main shaft 2. The left impeller 31 and the right impeller 32 are interlocked to form an adjustment chamber 33. Fluid enters the pump casing 1 through the inlet 11 and is pressurized by the rotation of the impeller blades. In this structure, by dividing the impeller 3 into a right impeller 32 and a left impeller 31 that is adjustable relative to the right impeller 32, the adjustment chamber 33 formed between the left impeller 31 and the right impeller 32 is changed by altering the distance between them, thereby changing the fluid pumping output. In this structure, since the left impeller 31 is fixedly connected to the bushing 21 and the bushing 21 is keyed to the main shaft 2, the sliding between the bushing 21 and the main shaft 2 is used to replace the sliding between the bearing and the main shaft 2 in the prior art, so as to reduce the wear of the bearing of the left impeller 31. At the same time, since the impeller 3 generates axial thrust during rotation, the bearing directly sliding with the main shaft 2 is easily affected by the axial thrust generated by the rotation, which affects the movement accuracy of the impeller 3. In this structure, the bearing of the left impeller 31 is directly fixed to the bushing 21. Under the limiting effect of the bushing 21, the axial thrust generated by the rotation of the impeller 3 is prevented from affecting the sliding accuracy of the left impeller 31.

[0044] The impeller 3 drive component 22 is connected to the end of the bushing 21 away from the left impeller 31, and is used to push the bushing 21 to move along the main shaft 2. The impeller 3 drive component 22 drives the bushing 21 and the left impeller 31 fixedly connected to the bushing 21 to rotate along the length direction of the main shaft 2 by hydraulic drive, so as to realize the volume change of the adjustment cavity 33 formed between the left impeller 31 and the left impeller 31. At the same time, the contact area between the blades of the impeller 3 that acts on the fluid pressurization changes, so as to realize the variable control of the fluid.

[0045] In this embodiment, please refer to Figures 1-2 As shown, the inlet 11 extends into the pump housing 1 to form an inlet chamber 13, and the outlet 12 extends into the pump housing 1 to form an outlet chamber 14. Both the inlet chamber 13 and the outlet chamber 14 are connected to the regulating chamber 33.

[0046] In one embodiment of this application, please refer to Figure 2 , Figure 4 As shown, the impeller 3 drive component 22 includes:

[0047] The mounting bushing 15 is fixedly connected to the pump housing 1 and is located at the end of the main shaft 2 away from the drive component 22;

[0048] The hydraulic drive component 41 has its fixed end fixedly connected to the mounting bushing 15, and its output end abutting against one end of the bushing 21.

[0049] Hydraulic supply component 42 is used to provide oil pressure to the hydraulic drive component 41;

[0050] The fixed end of the hydraulic drive component 41 is connected to the mounting sleeve 15, which is fixedly connected to the pump housing 1. The pushing end of the left impeller 31 abuts against the sleeve 21. The hydraulic drive component 41 drives the sleeve 21 to move, thereby changing the distance between the left impeller 31 and the right impeller 32. The hydraulic supply component 42 is used to supply hydraulic oil to the hydraulic drive component 41 or return hydraulic oil to achieve the sliding adjustment of the sleeve 21 along the main shaft 2.

[0051] In this embodiment, please refer to Figure 4 As shown, the hydraulic drive component 41 includes:

[0052] A retaining ring 411 is sleeved on the main shaft 2 and fixedly connected to the main shaft 2;

[0053] The push ring 412 is connected to the fixed ring 411 and can slide along the length of the main shaft 2. The output end of the push ring 412 abuts against the bushing 21.

[0054] A cavity ring 413 is sleeved and fixedly connected to the fixed ring 411, and the fixed ring 411 and the push ring 412 are separated by the cavity ring 413 to form a left oil chamber 414 and a right oil chamber 415. When the hydraulic drive component 41 pushes the bushing 21 to move, the hydraulic drive component 41 pushes the bushing 21 to move by filling the left oil chamber 414 with oil pressure and extracting the oil pressure into the right oil chamber 415. The fixed ring 411 and the push ring 412 rotate synchronously with the main shaft 2.

[0055] In some embodiments, please refer to Figure 4 As shown, the hydraulic supply component 42 includes:

[0056] The rotary joint 421 has a fixed end that is fixedly connected to the mounting bushing 15, and a rotating end that rotates synchronously with the main shaft 2. The rotary joint 421 is an existing standard part, which can rotate synchronously with the main shaft 2 while providing hydraulic oil to the hydraulic drive component 41.

[0057] The oil supply pipe of the left oil chamber 414 is formed inside the main shaft 2, and its two ends are respectively connected to the rotary joint 421 and the left oil chamber 414;

[0058] The right oil chamber supply pipe 423 is formed inside the main shaft 2, and its two ends are respectively connected to the rotary joint 421 and the right oil chamber 415; the left oil chamber 414 supply pipe and the right oil chamber supply pipe 423 are respectively used for the direct supply or return of hydraulic oil to the left oil chamber 414 and the right oil chamber 415. The rotary joint 421 is externally connected to two fluid pressure supply components. By setting a double oil chamber in the hydraulic drive component 41, where each individual oil chamber corresponds to an independent charging and extraction shared pipeline, the synchronous charging and return of hydraulic oil to the two oil chambers can be controlled by an oil pump to improve the working efficiency of the hydraulic drive component 41.

[0059] Please refer to Figure 4 As shown, the impeller 3 drive component 22 also includes an oil leakage return component 43, which comprises:

[0060] A leakage groove 431 is formed between the mounting bushing 15 and the hydraulic drive component 41. The leakage groove 431 is used to collect the hydraulic oil leaking from the left oil chamber 414 and to collect the hydraulic oil generated by the sliding of the hydraulic drive component 41, so as to prevent the oil pressure from overflowing in all directions.

[0061] A return port 432 is provided on the push ring 412. The push ring 412 is used to collect hydraulic oil leaking from the right oil chamber 415. The return port is used to prevent hydraulic oil from overflowing in all directions in the right oil chamber 415.

[0062] Wool felt 433 is attached to the retaining ring 411 and is used for sealing between the retaining ring 411 and the mounting sleeve 15. The retaining ring 411 and the mounting sleeve 15 are fixedly connected. By setting wool felt 433, the sealing performance between the mounting sleeve 15 and the retaining ring 411 can be improved.

[0063] Please refer to Figure 2 As shown, the oil leakage return component 43 also includes a return pipe 434 formed inside the main shaft 2, one end of which is a closed end and the other end is connected to the rotary joint 421. The return hole 432 is connected to the return pipe 434, and the return pipe 434 can realize the return of the leaking oil pressure inside the right oil chamber 415.

[0064] Please refer to Figure 1. Fixed vertical plates 16 are fixed at both ends of the pump casing 1, and the vertical plates provide horizontal support for the pump body.

[0065] Working principle of this utility model:

[0066] Fluid enters through inlet 11 and flows sequentially through inlet chamber 13, regulating chamber 33 for pressurization, outlet chamber 14, and finally exits through outlet 12. During the fluid pressurization process, the drive unit 22 synchronously drives the main shaft 2, the keyed bushing 21 on the main shaft 2, the right impeller 32 fixed on the main shaft 2, and the left impeller 31 sleeved on the bushing 21 to rotate synchronously. The fluid in the regulating chamber 33 changes its output pressure under the action of the blades of the left impeller 31 and the right impeller 32.

[0067] During the fluid variable process, the change in position between the left impeller 31 and the right impeller 32 is used to achieve the change in internal volume. At the same time, since the blades between the left impeller 31 and the right impeller 32 are staggered, the contact surface between the blades and the fluid changes accordingly when the distance between them changes, so as to achieve fluid variable control.

[0068] During the movement of the left impeller 31 relative to the right impeller 32, the output end of the hydraulic drive component 41 drives the bushing 21 to slide on the main shaft 2. The fixed ring 411 and the push ring 412 rotate synchronously with the main shaft 2, and the fixed ring 411 is fixedly connected to the main shaft 2, while the push ring 412 can slide along the length of the fixed ring 411. The push ring 412 and the fixed ring 411 are separated by a cavity ring 413, and the inner ring of the cavity ring 413 is fixedly connected to the fixed ring 411. When the hydraulic drive component 41 drives the bushing 21 to move, the oil supply pipe to the left oil chamber 414 is used to supply oil to the left oil chamber 414. When oil pressure is filled into the pump, the oil supply pipe 423 of the right oil chamber draws oil pressure into the right oil chamber 415, which enables the propulsion ring 412 to push the bushing 21 to move to the right. Similarly, the opposite enables the bushing 21 to move to the left. The movement of the bushing 21 changes the relative position between the left impeller 31 and the right impeller 32, thereby changing the volume of the adjustment chamber 33 formed between the left impeller 31 and the right impeller 32, and realizing variable control of the pump body. By sliding the bushing 21 against the main shaft 2, the sliding of the left impeller 31 bearing directly against the main shaft 2 is replaced, thereby improving the accuracy of variable sliding control and avoiding wear of the left impeller 31 bearing.

[0069] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0070] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A novel variable displacement pump without thrust bearing, characterized in that, include: The pump casing (1) has an inlet chamber (13) and an outlet chamber (14) on opposite sides, respectively; The main shaft (2) is rotatably connected to one side of the pump housing (1), and a drive member (22) is provided at one end of the main shaft (2). A bushing (21) is keyed on the main shaft (2), and a sliding stroke is formed on the main shaft (2) for the bushing (21) to slide. Impeller (3), which includes a left impeller (31) fixedly connected to one end of the bushing (21) and a right impeller (32) fixedly connected to the main shaft (2), wherein the impellers (3) between the left impeller (31) and the right impeller (32) are interleaved to form an adjustment cavity (33); An impeller drive (22) is connected to the end of the bushing (21) away from the left impeller (31) and is used to drive the bushing (21) to move along the main shaft (2).

2. The novel variable pump without thrust bearing according to claim 1, characterized in that: The inlet (11) extends into the pump housing (1) to form an inlet chamber (13), and the outlet (12) extends into the pump housing (1) to form an outlet chamber (14). Both the inlet chamber (13) and the outlet chamber (14) are connected to the regulating chamber (33).

3. The novel variable pump without thrust bearing according to claim 1, characterized in that, The impeller drive component (22) includes: The mounting bushing (15) is fixedly connected to the pump housing (1) and located at the end of the main shaft (2) away from the drive member (22); The hydraulic drive component (41) has its fixed end fixedly connected to the mounting bushing (15), and its output end abuts against one end of the bushing (21). A hydraulic supply unit (42) is used to supply oil pressure or return oil pressure to the hydraulic drive unit (41).

4. A novel variable displacement pump without thrust bearing according to claim 3, characterized in that, The hydraulic drive component (41) includes: A retaining ring (411) is sleeved on the main shaft (2) and fixedly connected to the main shaft (2); The push ring (412) is connected to the fixed ring (411) and can slide along the length direction of the main shaft (2). The output end of the push ring (412) abuts against the bushing (21). A cavity-splitting ring (413) is sleeved and fixedly connected to the fixed ring (411), and the fixed ring (411) and the propulsion ring (412) are separated by the cavity-splitting ring (413) to form a left oil cavity (414) and a right oil cavity (415).

5. A new type of variable capacity pump with no thrust bearing according to claim 4, characterized in that, The hydraulic supply component (42) includes: The rotary joint (421) has a fixed end that is fixedly connected to the mounting bushing (15), and a rotating end that rotates synchronously with the main shaft (2). The oil supply pipe of the left oil chamber (414) is formed in the main shaft (2), and its two ends are respectively connected to the rotary joint (421) and the left oil chamber (414); The right oil chamber supply pipe (423) is formed inside the main shaft (2), and its two ends are respectively connected to the rotary joint (421) and the right oil chamber (415).

6. A novel variable displacement pump without thrust bearing according to claim 5, characterized in that, The impeller drive component (22) also includes an oil return component (43), which comprises: A leakage groove (431) is formed between the mounting bushing (15) and the hydraulic drive (41), the leakage groove (431) being used to collect hydraulic oil leaking from the left oil chamber (414); A return hole (432) is provided on the push ring (412), which is used to collect hydraulic oil leaking from the right oil chamber (415); A wool felt (433) is attached to the retaining ring (411) and is used for sealing between the retaining ring (411) and the mounting bushing (15).

7. A novel variable displacement pump without thrust bearing according to claim 6, characterized in that: The oil leakage return component (43) also includes a return pipe (434) formed inside the main shaft (2), one end of which is a closed end and the other end is connected to the rotary joint (421), and the return hole (432) is connected to the return pipe (434).

8. A novel variable displacement pump without thrust bearing according to claim 1, characterized in that: Fixed vertical plates (16) are fixed at both ends of the pump casing (1).

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