Gear shaft self-lubricating gear pump

Abstract

The utility model belongs to gear pump technical field, specifically is a kind of gear pump of gear shaft self-lubricating, including pump shell and base, the one end of pump shell is passed through and is provided with main shaft, and the inside of pump shell and the inside of base all start to have a pair of installation groove, the below of main shaft is provided with auxiliary shaft, and the outside of main shaft and the outside of auxiliary shaft are all fixedly connected with gear block, the side of base is fixedly connected with a pair of connecting pipe, the application makes lubricating oil circulation flow in gear pump, lubrication treatment is carried out to gear shaft, does not contact with conveying medium, guarantees the lubrication effect, effectively improves the service life of gear pump, the application can carry out impurity filtration to circulating lubricating oil, improves lubrication effect, and supporting cylinder is convenient to dismount, is convenient to replace, lubricating oil can also be replaced without affecting the installation stability of gear shaft, further facilitate the use of gear pump.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, specifically a gear pump with a self-lubricating gear shaft. Background Technology

[0002] A gear pump is a rotary pump that transports or pressurizes liquids by relying on the change and movement of the working volume formed between the pump cylinder and meshing gears. It consists of two gears, a pump body, and front and rear covers forming two enclosed spaces. When the gears rotate, the volume of the space on the disengaged side of the gears increases from small to large, creating a vacuum that draws in the liquid. Conversely, the volume of the space on the meshing side of the gears decreases from large to small, forcing the liquid into the pipeline.

[0003] Patent document CN222779747U discloses a noise-reducing self-lubricating gear pump, including a pump body, a driving gear shaft and a driven gear shaft that are disposed in the inner cavity of the pump body and mesh with each other, and a floating bushing disposed at the top and bottom of the inner cavity of the pump body and rotatably sleeved and matched with the shaft portion of the driving gear shaft and the driven gear shaft. The floating bushing includes an “8” shaped body that is fitted onto the top and bottom of the inner cavity of the pump body.

[0004] The aforementioned gear pumps still have some problems in use. Existing gear pumps use the conveyed medium, namely hydraulic oil, as a lubricant to lubricate the gear shaft. However, in actual operation, gear pumps convey a wide variety of media, not just hydraulic oil, but also syrups, cosmetics, adhesives, and other items. These media do not provide lubrication; instead, they increase the rotational resistance of the gear shaft. Furthermore, since the gear pump directly uses the conveyed medium as a lubricant, the conveyed medium will directly contact the internal components of the pump body, such as the shaft and bearings, making it impossible to guarantee sealing and prone to leakage. Therefore, to address these issues, a gear pump with a self-lubricating gear shaft is proposed. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this application proposes a gear pump with a self-lubricating gear shaft, in which the lubricating oil circulates inside the gear pump to lubricate the gear shaft without contacting the conveying medium, thus ensuring the lubrication effect and effectively improving the service life of the gear pump.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The gear pump with self-lubricating gear shaft of this utility model includes a pump housing and a base. A main shaft is provided through one end of the pump housing, and a pair of mounting grooves are provided inside the pump housing and the base. A secondary shaft is provided below the main shaft, and gear blocks are fixedly connected to the outer side of the main shaft and the outer side of the secondary shaft. A pair of connecting pipes are fixedly connected to one side of the base. The connecting pipes are connected to the mounting grooves inside the base. A filter mechanism is provided in the center of the opposite surfaces of the two connecting pipes. An impeller is fixedly connected to one end of the main shaft and one end of the secondary shaft. Two sets of liquid guiding grooves are provided inside the main shaft and the secondary shaft. The pump housing and the base are fixedly connected.

[0007] Preferably, the filtration mechanism includes a support cylinder located between the two connecting pipes, a filter element is fixedly connected to the center inside the support cylinder, and extension sleeves are provided through both ends of the support cylinder, with a snap-fit ​​connector and a threaded ring fixedly connected to both ends of the extension sleeves respectively.

[0008] Preferably, the bearing is fixedly connected inside the mounting groove, the main shaft passes through the two bearings located above, the auxiliary shaft passes through the two bearings located below, and a sealing gasket is provided in the center of the opposite surface of the bearing and the gear block.

[0009] Preferably, the pump casing has connection ports on both sides, and the two gear blocks are meshed and connected. The two connection ports are located on both sides of the connection point of the two gear blocks.

[0010] Preferably, the two sets of liquid guiding grooves inside the main shaft are connected in a continuous manner, the two sets of liquid guiding grooves inside the secondary shaft are connected in a continuous manner, and the two mounting grooves inside the pump housing are connected in a continuous manner.

[0011] Preferably, the impeller at one end of the main shaft is in the opposite direction to the impeller at one end of the auxiliary shaft, and an oil seal is fixedly connected to the connection between the end of the main shaft away from the impeller and the pump casing.

[0012] Preferably, the two snap-fit ​​connectors are respectively snap-fitted into the vertical positions of the two connecting pipes, the threaded ring is located inside the support cylinder near the side, and the threaded ring is threadedly connected to the support cylinder.

[0013] The advantages of this utility model are: 1. In the process of media transportation, the main shaft and the auxiliary shaft drive the impeller to rotate, generating power. The lubricating oil is first used for lubrication in the mounting groove at the lower part of the base. Then, under the action of the impeller rotation, the lubricating oil in the mounting groove at the lower part of the base passes through the liquid guide groove inside the auxiliary shaft and enters the mounting groove at the lower part of the pump casing for lubrication. After that, it enters the mounting groove at the upper part of the pump casing for lubrication. Then, it passes through the liquid guide groove inside the main shaft and enters the mounting groove at the upper part of the base for lubrication. After that, the lubricating oil flows back to the mounting groove at the lower part of the base through the support cylinder. This application makes the lubricating oil circulate inside the gear pump to lubricate the gear shaft without contacting the transported medium, ensuring the lubrication effect and effectively improving the service life of the gear pump. 2. This utility model places the support cylinder between two connecting pipes. By rotating the extension sleeve, it connects to the support cylinder via a threaded ring, causing the clamping heads to move outward. This allows the two clamping heads to engage with the vertical positions of the two connecting pipes, thus fixing the position of the support cylinder. This allows for impurity filtration during the circulation of lubricating oil. Conversely, the clamping heads separate from the connecting pipes, enabling the support cylinder to be disassembled and replaced. This application can filter impurities from circulating lubricating oil, improving lubrication efficiency. Furthermore, the support cylinder is easy to install and remove, facilitating replacement. It also allows for lubricating oil replacement without affecting the stability of the gear shaft installation, further simplifying the use of the gear pump. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the internal structure of the pump casing and base of this utility model; Figure 3 This is an exploded view of the overall structure of this utility model; Figure 4 This is a schematic diagram of the pump casing of this utility model; Figure 5 This is a cross-sectional structural diagram of the secondary shaft of this utility model; Figure 6 This is a schematic diagram of the filtration mechanism of this utility model.

[0016] In the diagram: 1. Pump casing; 2. Base; 3. Main shaft; 4. Connecting port; 5. Mounting groove; 6. Bearing; 7. Countershaft; 8. Gear block; 9. Connecting pipe; 10. Filter mechanism; 11. Sealing gasket; 12. Impeller; 13. Liquid guide groove; 14. Support cylinder; 15. Filter element; 16. Extension sleeve; 17. Snap-fit ​​connector; 18. Threaded ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1 one Figure 6 As shown, a gear pump with a self-lubricating gear shaft is disclosed. The gear pump of this utility model includes a pump housing 1 and a base 2. A main shaft 3 is provided through one end of the pump housing 1, and a pair of mounting grooves 5 are provided inside the pump housing 1 and the base 2. A secondary shaft 7 is provided below the main shaft 3, and gear blocks 8 are fixedly connected to the outer side of the main shaft 3 and the outer side of the secondary shaft 7. A pair of connecting pipes 9 are fixedly connected to one side of the base 2, and the connecting pipes 9 are connected to the mounting grooves 5 inside the base 2. A filter mechanism 10 is provided in the center of the opposite side of the two connecting pipes 9. An impeller 12 is fixedly connected to one end of the main shaft 3 and one end of the secondary shaft 7, and two sets of liquid guiding grooves 13 are provided inside the main shaft 3 and the secondary shaft 7. The pump housing 1 and the base 2 are fixedly connected. During operation, existing gear pumps use hydraulic oil as a lubricant to lubricate the gear shaft. However, in actual operation, gear pumps transport a wide variety of media, not just hydraulic oil. They can also transport syrups, cosmetics, adhesives, and other substances. These media do not provide lubrication and instead increase the rotational resistance of the gear shaft. Furthermore, since the gear pump directly uses the transported medium as a lubricant, the medium will directly contact the internal components of the pump body, such as the shaft and bearing 6. This compromises the sealing performance and can easily lead to leakage. The guide groove 13 connects the two pairs of mounting grooves 5 into a whole, forming a closed-loop lubricating oil flow space to automatically lubricate the bearing 6 and the shaft.

[0019] Furthermore, the filter mechanism 10 includes a support cylinder 14 located between two connecting pipes 9. A filter element 15 is fixedly connected in the center of the support cylinder 14, and extension sleeves 16 are provided through both ends of the support cylinder 14. A snap-fit ​​connector 17 and a threaded ring 18 are fixedly connected to both ends of the extension sleeve 16, respectively. During operation, a filter mechanism 10 is provided to filter impurities carried by the lubricating oil during its circulation, thereby improving the lubrication effect.

[0020] Furthermore, the bearing 6 is fixedly connected inside the mounting groove 5, the main shaft 3 passes through the two bearings 6 located above, the auxiliary shaft 7 passes through the two bearings 6 located below, and a sealing gasket 11 is provided in the center of the opposite surface of the bearing 6 and the gear block 8. During operation, first install two bearings 6 inside the mounting groove 5 inside the base 2, then install two more bearings 6 inside the mounting groove 5 inside the pump housing 1. Next, attach two sealing gaskets 11 to the outer sides of the two pairs of bearings 6 respectively. Then, insert one end of the main shaft 3 through the upper bearing 6 inside the pump housing 1, with one end of the main shaft 3 located on the outer side of the pump housing 1, so that one end of the auxiliary shaft 7 passes through the lower bearing 6 inside the pump housing 1. Then, snap the base 2 into the pump housing 1 and fix it with bolts. At this time, the other end of the main shaft 3 and the other end of the auxiliary shaft 7 pass through the two bearings 6 inside the base 2 respectively. Finally, install an oil seal at the outer end of the main shaft 3 to complete the assembly of the gear pump.

[0021] Furthermore, connection ports 4 are provided on both sides of the pump casing 1, and two gear blocks 8 are meshed and connected. The two connection ports 4 are located on both sides of the connection point of the two gear blocks 8. During operation, the raw material pipe and the conveying pipe are fixedly connected to the two connection ports 4 respectively. Then, the outer end of the main shaft 3 is fixedly connected to the external drive component. The drive component is started to drive the main shaft 3 to rotate. Through the cooperation of the two gear blocks 8, the auxiliary shaft 7 rotates in the opposite direction. The conveying medium enters the gear pump from the raw material pipe, and after the meshing transmission of the two gear blocks 8, it is discharged from the conveying pipe, thus completing the medium conveying work.

[0022] Furthermore, the two sets of liquid guiding grooves 13 inside the main shaft 3 are connected through each other, the two sets of liquid guiding grooves 13 inside the auxiliary shaft 7 are connected through each other, and the two mounting grooves 5 inside the pump housing 1 are connected through each other. During operation, lubricating oil enters the lower mounting groove 5 inside the base 2 for lubrication. When the main shaft 3 and the auxiliary shaft 7 rotate, they drive the impeller 12 to rotate, generating power. The lubricating oil in the lower mounting groove 5 of the base 2 then passes through the liquid guide groove 13 inside the auxiliary shaft 7 and enters the lower mounting groove 5 inside the pump housing 1 for lubrication. After that, it enters the upper mounting groove 5 inside the pump housing 1 for lubrication, and then passes through the liquid guide groove 13 inside the main shaft 3 and enters the upper mounting groove 5 of the base 2 for lubrication.

[0023] Furthermore, the impeller 12 at one end of the main shaft 3 is in the opposite direction to the impeller 12 at one end of the auxiliary shaft 7, and an oil seal is fixedly connected to the connection between the end of the main shaft 3 away from the impeller 12 and the pump casing 1. During operation, when the main shaft 3 and the auxiliary shaft 7 rotate, they drive the impeller 12 to rotate, generating power and causing the lubricating oil to flow inside the gear pump.

[0024] Furthermore, the two snap-fit ​​connectors 17 are respectively snap-fitted into the vertical positions of the two connecting pipes 9, and the threaded ring 18 is located inside the support cylinder 14 near the side, and the threaded ring 18 is threadedly connected to the support cylinder 14. During operation, the lubricating oil flows back through the support cylinder 14 to the mounting groove 5 below the base 2, achieving the circulation of the lubricating oil. During the return flow, the lubricating oil is filtered by the filter element 15. Rotating the extension sleeve 16 drives the threaded ring 18 to rotate, which in turn moves the snap connector 17. When the snap connector 17 separates from the connecting pipe 9, the support cylinder 14 can be removed to replace the filter element. At the same time, the lubricating oil can be replaced without affecting the installation stability of the gear shaft.

[0025] Working principle: First, install two bearings 6 inside the mounting groove 5 inside the base 2. Then, install two more bearings 6 inside the mounting groove 5 inside the pump housing 1. Next, attach two sealing gaskets 11 to the outer sides of the two pairs of bearings 6 respectively. Then, insert one end of the main shaft 3 through the upper bearing 6 inside the pump housing 1, with one end of the main shaft 3 located on the outer side of the pump housing 1. Insert one end of the auxiliary shaft 7 through the lower bearing 6 inside the pump housing 1. Then, snap the base 2 into the pump housing 1 and fix it with bolts. At this time, the other end of the main shaft 3 and the other end of the auxiliary shaft 7 respectively pass through the two bearings 6 inside the base 2. Finally, install an oil seal at the outer end of the main shaft 3. Then, pour lubricating oil into the mounting groove 5 below the base 2 through the connecting pipe 9 below the base 2. Then, place the support cylinder 14 between the two connecting pipes 9. Rotate the extension sleeve 16, and connect it to the support cylinder 14 through the threaded ring 18. Move the snap-fit ​​connector 17 outward so that the two snap-fit ​​connectors 17 are snapped into the vertical positions of the two connecting pipes 9 respectively. This completes the assembly of the gear pump.

[0026] The raw material pipe and the conveying pipe are fixedly connected to the two connection ports 4 respectively. Then, the outer end of the main shaft 3 is fixedly connected to the external drive component. The drive component is started to drive the main shaft 3 to rotate. Through the cooperation of the two gear blocks 8, the auxiliary shaft 7 rotates in the opposite direction. The conveying medium enters the gear pump from the raw material pipe. After the meshing transmission of the two gear blocks 8, it is discharged from the conveying pipe, completing the medium conveying work.

[0027] During the media transport process, the main shaft 3 and the auxiliary shaft 7 drive the impeller 12 to rotate, generating power. The lubricating oil is first used for lubrication in the mounting groove 5 at the lower part of the base 2. Then, under the rotation of the impeller 12, the lubricating oil in the mounting groove 5 at the lower part of the base 2 passes through the liquid guide groove 13 inside the auxiliary shaft 7 and enters the mounting groove 5 at the lower part of the pump casing 1 for lubrication. After that, it enters the mounting groove 5 at the upper part of the pump casing 1 for lubrication. Then, it passes through the liquid guide groove 13 inside the main shaft 3 and enters the mounting groove 5 at the upper part of the base 2 for lubrication. After that, the lubricating oil flows back to the mounting groove 5 at the lower part of the base 2 through the support cylinder 14, realizing the circulation of the lubricating oil. During the return flow, the lubricating oil is filtered by the filter element 15 to improve the lubrication effect, thereby effectively improving the service life of the gear pump.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or similar improvements made within the theoretical and principle content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gear pump with a self-lubricating gear shaft, comprising a pump housing (1) and a base (2), characterized in that: One end of the pump housing (1) is provided with a main shaft (3), and both the inside of the pump housing (1) and the inside of the base (2) have a pair of mounting grooves (5). A secondary shaft (7) is provided below the main shaft (3), and gear blocks (8) are fixedly connected to the outside of the main shaft (3) and the outside of the secondary shaft (7). A pair of connecting pipes (9) are fixedly connected to one side of the base (2), and the connecting pipes (9) are connected to the mounting grooves (5) inside the base (2). A filter mechanism (10) is provided in the center of the opposite surfaces of the two connecting pipes (9). An impeller (12) is fixedly connected to one end of the main shaft (3) and one end of the secondary shaft (7), and two sets of liquid guiding grooves (13) are opened inside the main shaft (3) and the secondary shaft (7). The pump housing (1) and the base (2) are fixedly connected.

2. The gear pump with self-lubricating gear shaft according to claim 1, characterized in that: The filter mechanism (10) includes a support cylinder (14) located between the two connecting pipes (9). A filter element (15) is fixedly connected in the center of the support cylinder (14), and an extension sleeve (16) is provided through both ends of the support cylinder (14). A snap connector (17) and a threaded ring (18) are fixedly connected to both ends of the extension sleeve (16).

3. A gear pump with a self-lubricating gear shaft according to claim 1, characterized in that: The mounting groove (5) is internally fixedly connected to the bearing (6), the main shaft (3) passes through the two bearings (6) located above, the auxiliary shaft (7) passes through the two bearings (6) located below, and a sealing gasket (11) is provided in the center of the opposite surface of the bearing (6) and the gear block (8).

4. A gear pump with a self-lubricating gear shaft according to claim 1, characterized in that: The pump casing (1) has connection ports (4) on both sides, and the two gear blocks (8) are meshed and connected. The two connection ports (4) are located on both sides of the connection between the two gear blocks (8).

5. A gear pump with self-lubricating gear shaft according to claim 1, characterized in that: The two sets of liquid guiding grooves (13) inside the main shaft (3) are connected through each other, the two sets of liquid guiding grooves (13) inside the secondary shaft (7) are connected through each other, and the two mounting grooves (5) inside the pump housing (1) are connected through each other.

6. A gear pump with self-lubricating gear shaft according to claim 1, characterized in that: The impeller (12) at one end of the main shaft (3) is in the opposite direction to the impeller (12) at one end of the secondary shaft (7), and an oil seal is fixedly connected to the connection between the end of the main shaft (3) away from the impeller (12) and the pump casing (1).

7. A gear pump with self-lubricating gear shaft according to claim 2, characterized in that: The two clamping connectors (17) are respectively clamped to the vertical positions of the two connecting pipes (9), and the threaded ring (18) is located inside the support cylinder (14) near the side, and the threaded ring (18) is threadedly connected to the support cylinder (14).

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