Totally-closed high-rotating-speed gear pump
By using engineering plastic self-lubricating bearings and designing special lubrication grooves in gear pumps, the problems of bearing damage and limited performance of gear pumps at high speeds have been solved, achieving long-term reliable operation at high speeds and improving flow rate and head.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WEISHEN TECH (SHENZHEN) CO LTD
- Filing Date
- 2026-02-24
- Publication Date
- 2026-05-15
AI Technical Summary
Existing gear pumps are prone to bearing damage at high speeds (>1500 rpm), resulting in limited performance output, a small flow and head range, and high requirements for system cleanliness.
The self-lubricating bearing is made of engineering plastics and has a specially designed lubrication groove to achieve self-lubrication, increasing the speed to over 3000 rpm. The lubrication groove design also enables the gear pump to rotate smoothly at high speed.
This enables the gear pump to operate reliably for extended periods at high speeds, improving flow output capacity and head range while reducing the requirements for system cleanliness.
Smart Images
Figure CN122040607A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gear pump technology, and in particular to a fully enclosed high-speed gear pump. Background Technology
[0002] The most basic form of a gear pump is two gears of the same size meshing and rotating inside a tightly fitted housing. The inside of this housing is similar to the shape of an "8", with the two gears installed inside. The outer diameter and sides of the gears fit tightly with the housing.
[0003] Currently available gear pumps on the market have the following problems: 1. They use brass / plated bearings + ball bearings, resulting in limited speed output. 2. At high speeds (>1500 rpm), ball bearings and traditional bearings cannot provide effective output for extended periods or may fail quickly. 3. Performance output is limited, with limited flow and head output and a narrow range. 4. Assembly and operational malfunctions are common, and the bearings require a high degree of system cleanliness. Summary of the Invention
[0004] The purpose of this invention is to provide a fully enclosed high-speed gear pump. By designing a special lubrication groove, the speed can be increased to over 3000 rpm, and the material has a self-lubricating function, which is conducive to the reliable operation of the spindle for a long time.
[0005] To achieve the above objectives, the present invention provides a fully enclosed high-speed gear pump, including a housing, a cover on the top of the housing, and a gear assembly at the bottom inside the housing, the gear assembly being driven by a motor; The gear assembly includes a first gear and a second gear. The first gear is rotatably mounted on the lower cover, which is mounted on the bottom side of the housing. The second gear is fixed on the main shaft on the motor side and meshes with the first gear. A first self-lubricating bearing and a second self-lubricating bearing are respectively provided on the outer side of the main shaft and on the side of the second gear. Both the first self-lubricating bearing and the second self-lubricating bearing are made of engineering plastics.
[0006] An inlet pipe and an outlet pipe are welded and fixed to the outer shell, with the outlet pipe positioned above the inlet pipe.
[0007] A junction box is provided on the top of the cover.
[0008] The gear assembly is also equipped with a filter screen at its bottom inlet side.
[0009] The outer casing is also provided with plug welding pins.
[0010] This invention discloses a fully enclosed high-speed gear pump. The rotation of the main shaft drives the second gear and the first gear to mesh and separate. By utilizing volume changes, a continuous flow rate is output. The pump body of this application uses a first self-lubricating bearing and a second self-lubricating bearing made of high-precision engineering plastic with lubrication grooves. Through the special flow channel design of the first and second self-lubricating bearings, the gear pump can effectively and smoothly rotate at high speed and output a continuous flow. Furthermore, by designing a special lubrication groove, the speed can be increased to over 3000 rpm, and the material has a self-lubricating function, which is beneficial for the main shaft to operate reliably for a long time. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0012] Figure 1 This is a schematic diagram of the overall structure of the fully enclosed high-speed gear pump of the present invention.
[0013] Figure 2 This is a cross-sectional view of the fully enclosed high-speed gear pump of the present invention.
[0014] Figure 3 This is a schematic diagram of the installation position of the second gear of the present invention.
[0015] Figure 4 This is a schematic diagram of the structure of the second self-lubricating bearing of the present invention.
[0016] Figure 5 This is a schematic diagram of the structure of the first self-lubricating bearing of the present invention.
[0017] In the diagram: 1-Outer shell, 2-First gear, 3-Second gear, 4-Inlet pipe, 5-Second self-lubricating bearing, 6-First self-lubricating bearing, 7-Connecting plate, 8-Outlet pipe, 9-Cap, 10-Gate box, 11, 20-Flat key, 12-Motor, 13-Motor housing, 14, 19-Screw, 15-Upper cover, 16-Gear cavity, 17-Positioning pin, 18-Lower cover, 21-Filter screen, 22-Thrust plate, 23-Main shaft, 24-Plug welding pin. Detailed Implementation
[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention. Example
[0019] like Figures 1 to 5 As shown, where Figure 1 This is a schematic diagram of the overall structure of a fully enclosed high-speed gear pump. Figure 2This is a cross-sectional view of a fully enclosed high-speed gear pump. Figure 3 This is a schematic diagram showing the installation position of the second gear. Figure 4 This is a schematic diagram of the second self-lubricating bearing. Figure 5 This is a schematic diagram of the structure of the first self-lubricating bearing. The present invention provides a fully enclosed high-speed gear pump: comprising a housing 1, a cover 9, a motor 12, a main shaft 23, a lower cover 18, a first self-lubricating bearing 6, a second self-lubricating bearing 5, and a gear assembly, wherein the gear assembly includes a first gear 2 and a second gear 3. Through the aforementioned solution, by designing a dedicated lubrication groove, the rotational speed can be increased to over 3000 rpm, and the material has self-lubricating properties, which facilitates the reliable long-term operation of the main shaft. It is understood that the aforementioned solution facilitates the reliable long-term operation of the main shaft.
[0020] In this embodiment, the outer shell 1 is used for sealing protection. In addition, the standard parts used in this application can all be purchased from the market, and can all be customized according to the description and drawings. The specific connection methods of each part all adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, which are common knowledge in the field. Furthermore, since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit connection in detail.
[0021] The outer casing 1 is provided with a cover 9 on top, and a gear assembly is provided at the bottom inside the outer casing 1. The gear assembly is driven by a motor 12. The gear assembly continuously outputs flow by meshing and separating the gears and utilizing volume changes.
[0022] The first gear 2 is rotatably mounted on the lower cover 18, which is mounted on the bottom side of the outer casing 1. The second gear 3 is fixed on the main shaft 23 on the side of the motor 12 and meshes with the first gear 2. A first self-lubricating bearing 6 and a second self-lubricating bearing 5 are respectively provided on the outer side of the main shaft 23 and on the side of the second gear 3. The first self-lubricating bearing 6 and the second self-lubricating bearing 5 are used for shaft support during rotation.
[0023] Both the first self-lubricating bearing 6 and the second self-lubricating bearing 5 are made of engineering plastics. Each of the first self-lubricating bearing 6 and the second self-lubricating bearing 5 has a corresponding lubrication groove.
[0024] Secondly, an inlet pipe 4 and an outlet pipe 8 are welded and fixed to the outer shell 1, with the outlet pipe 8 positioned above the inlet pipe 4.
[0025] Then, a junction box 10 is provided on the top of the cover 9.
[0026] Furthermore, a filter screen 21 is provided on the bottom inlet side of the gear assembly. The filter screen 21 is used to filter impurities, reducing the amount of impurities entering the meshing area of the first gear 2 and the second gear 3.
[0027] Finally, the outer casing 1 is also provided with plug welding pins 24. Three plug welding pins 24 are arranged in a ring, with a 120° interval between them.
[0028] When using the fully enclosed high-speed gear pump of the present invention, the corresponding components are first processed using a corresponding CNC machine tool, and then the pump is assembled. The specific assembly process is as follows: The inlet pipe 4 and the outlet pipe 8 are sealed and welded to the outer shell 1 to form component I; The first self-lubricating bearing 6 and the second self-lubricating bearing 5 are press-fitted together with the upper cover 15 to form component II; The second self-lubricating bearing 5 is press-fitted together with the lower cover 18 to form component III; the thrust disk 22 is connected to the main shaft 23 with the flat key 11 to form component IV; The motor 12 and the motor housing 13 are cold-pressed together to form component V; The junction box 10 and the cover 9 are spot welded to form component VII.
[0029] Assembly process: Pass component IV through the inner holes of the first self-lubricating bearing 6 and the second self-lubricating bearing 5 in component II. Insert the second gear 3 into one end of the main shaft 23 with a clearance fit. Then connect them together using a flat key 20. Slightly rotate the direction to assemble the first gear 2 into component II according to its tooth profile, ensuring it is flush with the contact surface of component II. Then install the gear cavity 16 according to the outer contour of the gear and the hole orientation on component II, flush with the bottom surface of component II, and position it using the locating pin 17. Next, install component III into the other end of the gear cavity 16 according to the corresponding hole orientation and locating pin orientation, and connect them together using screws 19. Thus, the pump head assembly is assembled. After confirming there is no jamming, proceed. Invert the component V and slowly lower it through the gap between the motor stator and rotor until it aligns with the upper surface of the upper cover 15. Gently press it down with a hydraulic press to ensure that component V is flush with the upper surface of the upper cover 15. Then, place the connecting plate 7 on the upper surface of component V, align it with the threaded holes on the surface of the upper cover 15, and tighten it with screws 14. Spot weld the filter screen 21 to the corresponding hole on the lower surface of the lower cover 18 to form component VI. Test the suction force by powering on. After ensuring there are no abnormalities, slowly press component VI into component I with a hydraulic press. After pressing it to the specified position, insert the plug pin 24 corresponding to the plaque on the circumference of the upper cover 15, and seal it to component I with the plug pin 24. Align and seal component VII with component I according to the drawing requirements to complete the product assembly.
[0030] Operating Principle: The refrigerant medium enters the lower cavity of the pump body through the inlet pipe 4. The motor 12, when energized, drives component IV to rotate. The first gear 2 and the second gear 3 mesh, drawing the refrigerant from the suction port corresponding to the filter screen 21 through the holes on the surface of the lower cover 18 into the cavity of the gear chamber 16. The engagement and disengagement of the first gear 2 and the second gear 3 continuously change the volume, compressing the refrigerant medium. The refrigerant is then discharged from the outlet hole corresponding to the upper cover 15 into the cavity formed by component V and the upper surface of the upper cover 15. It also discharges through the holes on the circumference of the lower surface of the motor housing 13 into the cavity formed by the circumference of components I and V. The compressed liquid is discharged from the outlet pipe 8 on component I and flows into the circulation system. This cycle repeats continuously, providing a continuous supply of refrigerant to the system.
[0031] The pump body of this application uses a first self-lubricating bearing 6 and a second self-lubricating bearing 5 made of high-precision engineering plastic with lubrication grooves. Through the special flow channel design of the first self-lubricating bearing 6 and the second self-lubricating bearing 5, the gear pump can rotate effectively and smoothly at high speed and output continuously. In addition, by designing special lubrication grooves, the speed can be increased to more than 3000 rpm, and the material has a self-lubricating function, which is conducive to the reliable operation of the spindle for a long time.
[0032] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.
Claims
1. A fully enclosed high-speed gear pump, comprising a housing (1), characterized in that, A cover (9) is provided on the top of the outer shell (1), and a gear assembly is provided at the bottom inside the outer shell (1). The gear assembly is driven by a motor (12). The gear assembly includes a first gear (2) and a second gear (3). The first gear (2) is rotatably mounted on the lower cover (18), which is mounted on the bottom side of the housing (1). The second gear (3) is fixed on the main shaft (23) on the side of the motor (12) and meshes with the first gear (2). A first self-lubricating bearing (6) and a second self-lubricating bearing (5) are respectively provided on the outer side of the main shaft (23) and on the side of the second gear (3). Both the first self-lubricating bearing (6) and the second self-lubricating bearing (5) are made of engineering plastics.
2. The fully enclosed high-speed gear pump as described in claim 1, characterized in that, An inlet pipe (4) and an outlet pipe (8) are also welded and fixed on the outer shell (1), with the outlet pipe (8) positioned above the inlet pipe (4).
3. The fully enclosed high-speed gear pump as described in claim 1, characterized in that, A junction box (10) is provided on the top of the cover (9).
4. The fully enclosed high-speed gear pump as described in claim 1, characterized in that, A filter screen (21) is also provided on the bottom inlet side of the gear assembly.
5. The fully enclosed high-speed gear pump as described in claim 1, characterized in that, The outer casing (1) is also provided with a plug welding pin (24).