A silent gear pump with adjustable noise reduction mechanism

Abstract

This invention discloses a silent gear pump with an adjustable noise reduction mechanism, comprising a pumping housing, an adjusting housing, an inlet pipe, an outlet pipe, a pumping mechanism, and an adjusting mechanism. The adjusting housing is fixedly mounted on the pumping housing. Rotating the adjusting knob drives the adjusting screw to rotate, which in turn pushes a threaded cylinder to move. The threaded cylinder then pushes a push-pull plate to move within the pumping housing, which in turn drives the upper moving housing and the fixed rod to move. This allows the upper moving housing and the driven gear to move relative to the driving gear. At this time, the space between the upper moving housing, the lower moving housing, and the sealing assembly can be adjusted, as can the contact area between the driving gear and the driven gear. This allows the length of the driving gear and the driven gear between the upper and lower moving housings to be adjusted, thereby changing the amount of liquid transferred between the upper and lower moving housings by the driving gear and the driven gear, thus achieving the purpose of adjusting the transfer volume.

Description

Technical Field

[0001] This invention relates to the field of gear pump technology, specifically to a silent gear pump with an adjustable noise reduction mechanism. 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 increases, creating a vacuum that draws in liquid. Conversely, the volume of the space on the meshing side decreases, forcing the liquid into the pipeline. Because the tooth width, tooth pitch, and number of teeth are fixed values ​​and cannot be adjusted during use, the volume of liquid transported per revolution of the gears is the same. Therefore, the flow rate cannot be adjusted, limiting the gear pump's application range to only use as a metering pump. Summary of the Invention

[0003] The purpose of this invention is to provide a silent gear pump with an adjustable noise reduction mechanism to solve the problems mentioned above.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A silent gear pump with an adjustable noise reduction mechanism includes a pumping housing, an adjusting housing, an inlet pipe, an outlet pipe, a pumping mechanism, and an adjusting mechanism. The adjusting housing is fixedly mounted on the pumping housing. The inlet pipe and the outlet pipe are both fixedly mounted on the pumping housing and are connected to the inner cavity of the pumping housing. The pumping mechanism is located inside the pumping housing, and the adjusting mechanism is located inside the adjusting housing. The adjusting mechanism is connected to the pumping mechanism.

[0006] The pumping mechanism includes a driving gear, a driven gear, a fixed rod, a drive rod, an upper movable housing, a lower movable housing, and a sealing assembly. The drive rod, driving gear, and driven gear are all rotatably disposed within the pumping housing. One end of the drive rod rotatably penetrates one side of the pumping housing. The driving gear is fixedly sleeved on the drive rod. The fixed rod is disposed within the pumping housing and is connected to an adjusting mechanism. The driven gear is rotatably disposed on the fixed rod via a bearing and meshes with the driving gear. The upper and lower movable housings are slidably disposed within the pumping housing and are slidably connected. The driving gear and driven gear are both located between the upper and lower movable housings. The sealing assembly is slidably disposed within the pumping housing and is connected to both the upper and lower movable housings. The inlet pipe and outlet pipe are both connected to the lower movable housing.

[0007] The adjustment mechanism includes an adjustment screw, an adjustment knob, a threaded cylinder, a push-pull plate, and a limiting assembly. The adjustment screw and the threaded cylinder are both rotatably disposed within the adjustment housing, and the threaded cylinder is connected to the limiting assembly. The adjustment screw is threadedly connected to the threaded cylinder. The adjustment knob is rotatably disposed on the side of the adjustment housing away from the pumping housing. The end of the adjustment screw away from the threaded cylinder rotatably passes through the side of the adjustment housing and is fixedly connected to the adjustment knob. The push-pull plate is slidably disposed within the pumping housing and is fixedly connected to the upper moving housing and the fixed rod. The end of the threaded cylinder away from the adjustment screw slidably passes through the inner wall of the pumping housing and is fixedly connected to the push-pull plate.

[0008] As a preferred embodiment of the present invention, the sealing assembly includes two movable rings, two blocking plates, and two internal tooth sealing rings. The two movable rings are respectively fixedly mounted on the upper movable shell and the lower movable shell. The two internal tooth sealing rings are respectively rotatably mounted inside the two movable rings and are respectively slidably sleeved on the driving gear and the driven gear. The two blocking plates are respectively fixedly mounted on the two movable rings and are respectively slidably mounted inside the upper movable shell and the lower movable shell.

[0009] As a preferred embodiment of the present invention, a rotary seal is fixedly sleeved on the internal tooth sealing ring, the rotary seal is rotatably connected to the inner wall surface of the moving ring, and a sliding seal is provided on the blocking plate, the two sliding seals being slidably connected to the inner wall surface of the upper moving shell and the inner wall surface of the lower moving shell, respectively.

[0010] As a preferred embodiment of the present invention, two limiting rings are symmetrically arranged on the moving ring, and the internal tooth sealing ring is rotatably disposed between the two limiting rings, wherein the inner diameter of the limiting ring is larger than the outer diameter of the internal tooth sealing ring.

[0011] As a preferred embodiment of the present invention, the limiting component includes a positioning ring and two limiting slide rods. The positioning ring is slidably disposed within the adjusting shell and is fixedly sleeved on the threaded cylinder. Both limiting slide rods are fixedly disposed within the adjusting shell, and the positioning ring is slidably sleeved on the two limiting slide rods.

[0012] As a preferred embodiment of the present invention, both the drive rod and the pump housing are fitted with sealing rings. The sealing ring on the drive rod is used to provide rotational sealing at the connection between the drive rod and the pump housing, and the sealing ring on the pump housing is used to provide movable sealing at the connection between the threaded cylinder and the pump housing.

[0013] As a preferred embodiment of the present invention, there is a gap between the upper moving shell and the pumping shell, and there is also a gap between the lower moving shell and the pumping shell.

[0014] As a preferred embodiment of the present invention, the pump housing is provided with a discharge port, and a threaded plug is threadedly connected to the discharge port.

[0015] As a preferred embodiment of the present invention, the adjusting shell has a strip-shaped hole, a transparent plate is fixedly disposed in the strip-shaped hole, and an indicator plate is fixedly disposed on the positioning ring, the indicator plate being aligned with the transparent plate.

[0016] This invention uses a rotating adjustment mechanism to change the amount of liquid transferred between the upper and lower moving shells by the driving and driven gears, thereby achieving the purpose of adjusting the amount of liquid transferred and expanding the scope of application.

[0017] The present invention can drive the threaded cylinder to move through the adjustment mechanism, which in turn drives the positioning ring to move. The positioning ring drives the indicator plate to move, so that the indicator plate can move relative to the transparent plate. The movement distance of the indicator plate can be observed through the scale lines on the transparent plate, which makes it easy to judge the amount of liquid transferred after adjustment.

[0018] The present invention has gaps between the upper and lower moving shells and the pumping shell, forming a noise reduction mechanism. Liquid can be filled between the upper and lower moving shells and the pumping shell, so that the liquid can wrap around the upper and lower moving shells, thereby absorbing some of the noise and achieving the effect of noise reduction for the driving gear and the driven gear. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure from another perspective of the present invention;

[0021] Figure 3 This is an enlarged structural schematic diagram of the present invention (A).

[0022] Figure 4 This is a schematic diagram of the pumping mechanism in this invention;

[0023] Figure 5 This is a schematic diagram of the sliding seal structure in this invention;

[0024] Figure 6 This is a schematic diagram of the sealing assembly in this invention;

[0025] Figure 7 In this invention Figure 6 A schematic diagram of the cross-sectional structure;

[0026] Figure 8 This is a schematic diagram of the limiting component in this invention;

[0027] Figure 9 This is a schematic diagram of the adjustment mechanism in this invention.

[0028] In the diagram: 1. Pump housing; 2. Adjusting housing; 3. Inlet pipe; 4. Outlet pipe; 5. Pumping mechanism; 501. Driving gear; 502. Driven gear; 503. Fixed rod; 504. Drive rod; 505. Upper moving housing; 506. Lower moving housing; 6. Adjusting mechanism; 601. Adjusting screw; 602. Adjusting knob; 603. Threaded cylinder; 604. Push-pull plate; 7. Sealing assembly; 701. Moving ring; 702. Baffle plate; 703. Internal tooth sealing ring; 8. Limiting assembly; 801. Positioning ring; 802. Limiting slide bar; 9. Rotary seal; 10. Sliding seal; 11. Limiting ring; 12. Discharge port; 13. Threaded plug; 14. Strip hole; 15. Transparent plate; 16. Indicator plate; 17. Scale line. Detailed Implementation

[0029] 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. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Example: Please refer to Figure 1-9 The silent gear pump with an adjustable noise reduction mechanism shown includes a pumping housing 1, an adjusting housing 2, an inlet pipe 3, an outlet pipe 4, a pumping mechanism 5, and an adjusting mechanism 6. The adjusting housing 2 is fixedly mounted on the pumping housing 1. The inlet pipe 3 and the outlet pipe 4 are both fixedly mounted on the pumping housing 1 and are connected to the inner cavity of the pumping housing 1. The pumping mechanism 5 is located inside the pumping housing 1, and the adjusting mechanism 6 is located inside the adjusting housing 2. The adjusting mechanism 6 is connected to the pumping mechanism 5.

[0031] In this embodiment, reference is made to Figure 4-5 , Figure 9As shown, the pumping mechanism 5 includes a driving gear 501, a driven gear 502, a fixed rod 503, a drive rod 504, an upper movable housing 505, a lower movable housing 506, and a sealing assembly 7. The drive rod 504, driving gear 501, and driven gear 502 are all rotatably disposed within the pumping housing 1. One end of the drive rod 504 rotatably passes through one side of the pumping housing 1. The driving gear 501 is fixedly sleeved on the drive rod 504. The fixed rod 503 is disposed within the pumping housing 1 and is connected to the adjusting mechanism 6. The driven gear 502 passes through... The bearing is rotatably mounted on the fixed rod 503. The driven gear 502 meshes with the driving gear 501. The upper moving shell 505 and the lower moving shell 506 are both slidably mounted in the pumping shell 1 and are slidably connected. The driving gear 501 and the driven gear 502 are both located between the upper moving shell 505 and the lower moving shell 506. The sealing assembly 7 is slidably mounted in the pumping shell 1 and is connected to the upper moving shell 505 and the lower moving shell 506. The inlet pipe 3 and the outlet pipe 4 are both connected to the lower moving shell 506.

[0032] In this embodiment, reference is made to Figure 2 , Figure 8-9 As shown, the adjustment mechanism 6 includes an adjustment screw 601, an adjustment knob 602, a threaded cylinder 603, a push-pull plate 604, and a limiting assembly 8. The adjustment screw 601 and the threaded cylinder 603 are both rotatably disposed within the adjustment housing 2, and the threaded cylinder 603 is connected to the limiting assembly 8. The adjustment screw 601 is threadedly connected to the threaded cylinder 603. The adjustment knob 602 is rotatably disposed on the side of the adjustment housing 2 away from the pumping housing 1. The end of the adjustment screw 601 away from the threaded cylinder 603 rotatably passes through the side of the adjustment housing 2 and is fixedly connected to the adjustment knob 602. The push-pull plate 604 is slidably disposed within the pumping housing 1 and is fixedly connected to the upper movable housing 505 and the fixed rod 503. The end of the threaded cylinder 603 away from the adjustment screw 601 slidably passes through the inner wall of the pumping housing 1 and is fixedly connected to the push-pull plate 604.

[0033] Rotating the adjusting knob 602 drives the adjusting screw 601 to rotate, causing the adjusting screw 601 to push the threaded cylinder 603 to move within the adjusting shell 2 and the pumping shell 1. This, in turn, causes the threaded cylinder 603 to push the push-pull plate 604 to move within the pumping shell 1. The movement of the pumping shell 1 pushes the upper moving shell 505 and the fixed rod 503 to move, causing the fixed rod 503 to drive the driven gear 502 to move. This allows the upper moving shell 505 and the driven gear 502 to move relative to the lower moving shell 506 and the driving gear 501. The movement of the upper moving shell 505 relative to the lower moving shell 506 adjusts the overlap range between the upper moving shell 505 and the lower moving shell 506, thereby adjusting the space between the upper moving shell 505, the lower moving shell 506, and the sealing assembly 7. The size of the space between the driven gear 502 and the driving gear 501 can be adjusted, as can the length of the driven gear 502 and the driving gear 501 between the upper moving shell 505 and the lower moving shell 506. The longer the length of the driving gear 501 and the driven gear 502 between the upper moving shell 505 and the lower moving shell 506, the more liquid it can transport. The movement of the driven gear 502 relative to the driving gear 501 can adjust the contact range between the driven gear 502 and the driving gear 501, so that the squeezing between the driving gear 501 and the driven gear 502 can squeeze out the liquid between the upper moving shell 505 and the lower moving shell 506, achieving the effect of liquid transport. The liquid can enter through the liquid inlet pipe 3 and exit through the liquid outlet pipe 4. The transport volume can be adjusted by rotating the adjustment knob 602, which improves the application range.

[0034] In this embodiment, reference is made to Figure 5-7As shown, the sealing assembly 7 includes two movable rings 701, two baffle plates 702, and two internal tooth sealing rings 703. The two movable rings 701 are fixedly mounted on the upper movable housing 505 and the lower movable housing 506, respectively. The two internal tooth sealing rings 703 are rotatably mounted inside the two movable rings 701, and are slidably sleeved on the driving gear 501 and the driven gear 502, respectively. The two baffle plates 702 are fixedly mounted on the two movable rings 701, and are slidably mounted inside the upper movable housing 505 and the lower movable housing 506, respectively. The toothed structure on the internal tooth sealing rings 703 can tightly engage with the tooth grooves on the driving gear 501 and the driven gear 502. The contact ensures a tight seal, and when the drive gear 501 and driven gear 502 rotate, they drive the internal tooth sealing ring 703 to rotate on the moving ring 701, ensuring that the drive gear 501 and driven gear 502 can rotate normally to transfer liquid. The baffle plate 702 can contact the upper moving shell 505 and lower moving shell 506, so that a closed space can be formed between the upper moving shell 505, lower moving shell 506, two internal tooth sealing rings 703 and two baffle plates 702. The part of the drive gear 501 and driven gear 502 located between the upper moving shell 505, lower moving shell 506, two internal tooth sealing rings 703 and two baffle plates 702 can transfer liquid.

[0035] The internal gear sealing ring 703 is fixedly fitted with a rotary seal 9, which is rotatably connected to the inner wall of the moving ring 701. The baffle plate 702 is provided with a sliding seal 10, which is slidably connected to the inner wall of the upper moving shell 505 and the inner wall of the lower moving shell 506, respectively. The rotary seal 9 can seal between the internal gear sealing ring 703 and the moving ring 701, ensuring that the sealing effect can still be achieved when the driving gear 501 and the driven gear 502 rotate normally. The sliding seal 10 can seal between the baffle plate 702 and the upper moving shell 505 and the lower moving shell 506, ensuring that the baffle plate 702 can achieve a sealing effect while moving relative to the upper moving shell 505 and the lower moving shell 506.

[0036] The movable ring 701 is also symmetrically provided with two limiting rings 11. The internal tooth sealing ring 703 is rotatably disposed between the two limiting rings 11. The inner diameter of the limiting ring 11 is larger than the outer diameter of the internal tooth sealing ring 703. When the upper movable shell 505 and the lower movable shell 506 move relative to each other, they can drive the limiting ring 11 to move, so that the limiting ring 11 can push the internal tooth sealing ring 703 to move laterally from the side, thereby driving the rotary seal 9 to move laterally. This can prevent the rotary seal 9 from being subjected to lateral force and avoid affecting its sealing effect.

[0037] In this embodiment, reference is made to Figure 8-9As shown, the limiting assembly 8 includes a positioning ring 801 and two limiting slide rods 802. The positioning ring 801 is slidably disposed within the adjusting shell 2 and is fixedly sleeved on the threaded cylinder 603. Both limiting slide rods 802 are fixedly disposed within the adjusting shell 2, and the positioning ring 801 is slidably sleeved on the two limiting slide rods 802. Rotating the adjusting knob 602 drives the adjusting screw 601 to rotate, causing the adjusting screw 601 to push the threaded cylinder 603 to move. This allows the threaded cylinder 603 to drive the positioning ring 801 to slide on the limiting slide rods 802. The cooperation between the positioning ring 801 and the limiting slide rods 802 can limit the threaded cylinder 603, preventing the threaded cylinder 603 from rotating with the adjusting screw 601. This ensures that the threaded cylinder 603 can only move in a straight line, improving the sealing effect.

[0038] Both the drive rod 504 and the pump housing 1 are fitted with sealing rings. The sealing ring on the drive rod 504 is used to provide a rotational seal at the connection between the drive rod 504 and the pump housing 1, and the sealing ring on the pump housing 1 is used to provide a movable seal at the connection between the threaded cylinder 603 and the pump housing 1. This improves the sealing effect between the drive rod 504, the threaded cylinder 603 and the pump housing 1, and can prevent liquid leakage.

[0039] In this embodiment, there is a gap between the upper movable shell 505 and the pumping shell 1, and there is also a gap between the lower movable shell 506 and the pumping shell 1. Liquid can be filled between the upper movable shell 505, the lower movable shell 506 and the pumping shell 1 so that the liquid can surround the upper movable shell 505 and the lower movable shell 506. Since the liquid has the effect of absorbing sound, noise reduction can be achieved.

[0040] The pump housing 1 is provided with a discharge port 12, and a threaded plug 13 is threadedly connected to the discharge port 12. The liquid between the upper moving housing 505, the lower moving housing 506 and the pump housing 1 can be discharged through the discharge port 12, which facilitates the replacement of the liquid inside them to cope with the transmission of different liquids. The threaded plug 13 can block the discharge port 12, which can prevent the liquid from leaking between the upper moving housing 505, the lower moving housing 506 and the pump housing 1, and facilitate the replacement of the liquid between the upper moving housing 505, the lower moving housing 506 and the pump housing 1.

[0041] In this embodiment, reference is made to Figure 2-3 , Figure 8-9As shown, the adjusting shell 2 has a strip-shaped hole 14, and a transparent plate 15 is fixedly installed inside the strip-shaped hole 14. An indicator plate 16 is fixedly installed on the positioning ring 801. The indicator plate 16 is aligned with the transparent plate 15. Rotating the adjusting knob 602 drives the adjusting screw 601 to rotate, so that the adjusting screw 601 can push the threaded cylinder 603 to move. In turn, the threaded cylinder 603 can drive the indicator plate 16 to move through the positioning ring 801. By observing the moving distance of the indicator plate 16, the moving distance of the driven gear 502 can be determined, and thus the transmission amount can be determined.

[0042] The transparent plate 15 is provided with a scale line 17, which is aligned with the indicator plate 16. The indicator plate 16 can move relative to the scale line 17. The scale line 17 marks the amount of liquid that can be transferred at different positions. The position of the indicator plate 16 on the scale line 17 is the amount of liquid that the driving gear 501 and the driven gear 502 can currently transfer.

[0043] In use, rotating the adjustment knob 602 causes the adjustment screw 601 to rotate, which in turn moves the threaded cylinder 603. The threaded cylinder 603 then moves the positioning ring 801, which in turn moves the indicator plate 16. The indicator plate 16 moves relative to the scale line 17, allowing the volume of liquid that can be transferred to be determined. The movement of the threaded cylinder 603 also pushes the push-pull plate 604, which in turn moves the upper moving shell 505 and the fixed rod 503, ultimately driving the driven gear 502. When the upper movable housing 505 moves, it can push one of the internal tooth sealing rings 703 to move on the driving gear 501. When the driven gear 502 moves, it can move relative to the internal tooth sealing ring 703 on the lower movable housing 506. It can also adjust the distance between the two internal tooth sealing rings 703 and the two baffles 702, thereby adjusting the size of the space between the upper movable housing 505, the lower movable housing 506, the two internal tooth sealing rings 703 and the two baffles 702, and adjusting the length of the driving gear 501 and the driven gear 502 between the upper movable housing 505 and the lower movable housing 506. This can achieve the effect of adjusting the transmission volume, allowing liquid to enter from the inlet pipe 3.

[0044] After being transmitted through the driving gear 501 and driven gear 502 between the upper moving shell 505 and the lower moving shell 506, the liquid is discharged through the outlet pipe 4. Liquid can be introduced between the upper moving shell 505, the lower moving shell 506, and the pumping shell 1 through the discharge port 12, allowing the liquid to envelop the lower moving shell 506 and the upper moving shell 505, thus achieving a noise reduction effect. The liquid between the upper moving shell 505, the lower moving shell 506, and the pumping shell 1 can be transferred with the liquid between the upper moving shell 505 and the lower moving shell 506, and the liquid between the upper moving shell 505, the lower moving shell 506, and the pumping shell 1 is the same as the liquid between the upper moving shell 505 and the lower moving shell 506. Therefore, there is no need to worry about the liquid between the upper moving shell 505, the lower moving shell 506, and the pumping shell 1 mixing with the liquid between the upper moving shell 505 and the lower moving shell 506.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A silent gear pump with an adjustable noise reduction mechanism, characterized in that: The system includes a pump housing (1), an adjusting housing (2), an inlet pipe (3), an outlet pipe (4), a pumping mechanism (5), and an adjusting mechanism (6). The adjusting housing (2) is fixedly mounted on the pump housing (1). The inlet pipe (3) and the outlet pipe (4) are both fixedly mounted on the pump housing (1) and are connected to the inner cavity of the pump housing (1). The pumping mechanism (5) is located inside the pump housing (1), and the adjusting mechanism (6) is located inside the adjusting housing (2). The adjusting mechanism (6) is connected to the pumping mechanism (5). The pumping mechanism (5) includes a driving gear (501), a driven gear (502), a fixed rod (503), a driving rod (504), an upper movable housing (505), a lower movable housing (506), and a sealing assembly (7). The driving rod (504), the driving gear (501), and the driven gear (502) are all rotatably disposed inside the pumping housing (1). One end of the driving rod (504) rotatably penetrates one side of the pumping housing (1). The driving gear (501) is fixedly sleeved on the driving rod (504). The fixed rod (503) is disposed inside the pumping housing (1) and is connected to the adjusting mechanism (6). The driven gear (502) is connected to the adjusting mechanism (6). The bearing is rotatably mounted on the fixed rod (503). The driven gear (502) meshes with the driving gear (501). The upper moving shell (505) and the lower moving shell (506) are both slidably mounted in the pumping shell (1). The upper moving shell (505) and the lower moving shell (506) are slidably connected. The driving gear (501) and the driven gear (502) are both located between the upper moving shell (505) and the lower moving shell (506). The sealing assembly (7) is slidably mounted in the pumping shell (1) and is connected to the upper moving shell (505) and the lower moving shell (506). The inlet pipe (3) and the outlet pipe (4) are both connected to the lower moving shell (506). The adjusting mechanism (6) includes an adjusting screw (601), an adjusting knob (602), a threaded cylinder (603), a push-pull plate (604), and a limiting assembly (8). The adjusting screw (601) and the threaded cylinder (603) are both rotatably disposed within the adjusting housing (2), and the threaded cylinder (603) is connected to the limiting assembly (8). The adjusting screw (601) is threadedly connected to the threaded cylinder (603), and the adjusting knob (602) is rotatably disposed in the adjusting housing (2) away from the pump housing (1). On one side, the end of the adjusting screw (601) away from the threaded cylinder (603) rotates through one side of the adjusting shell (2) and is fixedly connected to the adjusting knob (602). The push-pull plate (604) is slidably disposed inside the pumping shell (1). The push-pull plate (604) is fixedly connected to the upper moving shell (505) and the fixing rod (503). The end of the threaded cylinder (603) away from the adjusting screw (601) slides through the inner wall of the pumping shell (1) and is fixedly connected to the push-pull plate (604).

2. A silent gear pump with an adjustable noise reduction mechanism according to claim 1, characterized in that: The sealing assembly (7) includes two movable rings (701), two baffles (702), and two internal tooth sealing rings (703). The two movable rings (701) are fixedly mounted on the upper movable shell (505) and the lower movable shell (506), respectively. The two internal tooth sealing rings (703) are rotatably mounted inside the two movable rings (701), and the two internal tooth sealing rings (703) are slidably mounted on the driving gear (501) and the driven gear (502), respectively. The two baffles (702) are fixedly mounted on the two movable rings (701), and the two baffles (702) are slidably mounted inside the upper movable shell (505) and the lower movable shell (506), respectively.

3. A silent gear pump with an adjustable noise reduction mechanism according to claim 2, characterized in that: A rotary seal (9) is fixedly sleeved on the internal toothed sealing ring (703). The rotary seal (9) is rotatably connected to the inner wall surface of the moving ring (701). A sliding seal (10) is provided on the baffle plate (702). The two sliding seals (10) are slidably connected to the inner wall surface of the upper moving shell (505) and the inner wall surface of the lower moving shell (506), respectively.

4. A silent gear pump with an adjustable noise reduction mechanism according to claim 3, characterized in that: Two limiting rings (11) are symmetrically arranged on the moving ring (701). The internal tooth sealing ring (703) is rotatably arranged between the two limiting rings (11). The inner diameter of the limiting ring (11) is larger than the outer diameter of the internal tooth sealing ring (703).

5. A silent gear pump with an adjustable noise reduction mechanism according to claim 1, characterized in that: The limiting component (8) includes a positioning ring (801) and two limiting slide rods (802). The positioning ring (801) is slidably disposed in the adjusting shell (2) and is fixedly sleeved on the threaded cylinder (603). The two limiting slide rods (802) are both fixedly disposed in the adjusting shell (2) and the positioning ring (801) is slidably sleeved on the two limiting slide rods (802).

6. A silent gear pump with an adjustable noise reduction mechanism according to claim 1, characterized in that: Both the drive rod (504) and the pump housing (1) are fitted with sealing rings. The sealing ring on the drive rod (504) is used to provide rotational sealing at the connection between the drive rod (504) and the pump housing (1), and the sealing ring on the pump housing (1) is used to provide movable sealing at the connection between the threaded cylinder (603) and the pump housing (1).

7. A silent gear pump with an adjustable noise reduction mechanism according to claim 1, characterized in that: There is a gap between the upper movable shell (505) and the pumping shell (1), and there is also a gap between the lower movable shell (506) and the pumping shell (1).

8. A silent gear pump with an adjustable noise reduction mechanism according to claim 1, characterized in that: The pump housing (1) is provided with a discharge port (12), and a threaded plug (13) is threadedly connected to the discharge port (12).

9. A silent gear pump with an adjustable noise reduction mechanism according to claim 5, characterized in that: The adjusting shell (2) has a strip hole (14), a transparent plate (15) is fixedly installed inside the strip hole (14), and an indicator plate (16) is fixedly installed on the positioning ring (801), with the indicator plate (16) aligned with the transparent plate (15).

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