Low-noise gear pump with vibration reduction structure and noise reduction method of low-noise gear pump

Abstract

The invention relates to the technical field of gear pumps, in particular to a low-noise gear pump with a vibration reduction structure and a noise reduction method of the low-noise gear pump, and solves the problems that when an existing gear pump runs, a gear performs pressurized conveying on liquid to cause radial force impact on a shaft body, then the radial force of the shaft body is unbalanced, pulsation is large in the liquid flowing process, and noise is reduced. The device comprises a gear transmission mechanism and two center supporting mechanisms, a pump shell mechanism is installed on the outer side of the gear transmission mechanism, the two center supporting mechanisms are installed on the inner side of the gear transmission mechanism, the gear transmission mechanism comprises a driving shaft, a driven shaft is installed on one side of the driving shaft, and the driven shaft is installed on the other side of the driving shaft. And gears are fixedly arranged on the outer sides of the middle parts of the driving shaft and the driven shaft. According to the gear pump, the shaft body of the gear pump is centrally supported, so that the stability of liquid during pressurized conveying can be effectively improved, the conditions of unbalanced radial force and large liquid flow pulsation are reduced, and the vibration noise of the gear pump is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of gear pumps, in particular to a low-noise gear pump with a vibration reduction structure and a noise reduction method thereof. Background Art

[0002] A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport liquid or increase its pressure. The gear pump is driven by an independent motor and can effectively block upstream pressure pulsation and flow fluctuations. At present, the mature technology, durable quality, energy-saving effect and various models of the gear pump industry have been widely recognized in all walks of life. Various companies are continuously investing a lot of money and energy in technological upgrades. The gear pump industry is entering a more prosperous stage with higher quality and better performance.

[0003] When the existing gear pump is in operation, the gears pressurize the liquid and cause radial force impact on the shaft, which leads to unbalanced radial force on the shaft, large pulsation during the flow of the liquid, and vibration noise. Therefore, it does not meet the existing needs. We have proposed a low-noise gear pump with a vibration reduction structure and a noise reduction method thereof. Summary of the invention

[0004] The object of the present invention is to provide a low-noise gear pump with a vibration reduction structure and a noise reduction method thereof, so as to solve the problem proposed in the above background technology that when the existing gear pump is in operation, the gears pressurize the liquid and convey it, which will cause radial force impact on the shaft, thereby causing unbalanced radial force of the shaft, large pulsation during the flow of the liquid, and causing vibration noise.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a low-noise gear pump with a vibration reduction structure, comprising a gear transmission mechanism and two central support mechanisms, a pump housing mechanism is installed on the outer side of the gear transmission mechanism, and two central support mechanisms are installed on the inner side of the gear transmission mechanism, the gear transmission mechanism comprises a driving shaft, a driven shaft is installed on one side of the driving shaft, gears are fixedly arranged on the outer sides of the middle parts of the driving shaft and the driven shaft, and the two gears are connected by tooth meshing;

[0006] The central support mechanism includes a limit ring, which is fixedly connected to the driving shaft and the driven shaft, a second bearing is installed on the outer side of the limit ring, a positioning ring is installed on one side of the second bearing, a first bearing is installed on the inner side of the positioning ring, a central support rod is installed on the inner side of the first bearing, a positioning column is installed at one end of the central support rod, a sealing limit cover is installed at the other end of the central support rod, a support sleeve is installed on the outer side of one end of the central support rod, a plurality of spline rings are provided on the outer surface of the support sleeve, a transmission sleeve is installed on the outer side of the support sleeve, and a plurality of positioning strips are provided on the inner wall of the transmission sleeve.

[0007] Preferably, the gear transmission mechanism also includes two isolation side plates fitted with the two ends of the two gears, wherein two first shaft sleeves are installed on one side of one of the isolation side plates, and two second shaft sleeves are installed on one side of the other isolation side plate, and a plurality of guide channels are provided at one end of the driving shaft and the driven shaft close to the second shaft sleeve.

[0008] Preferably, the pump casing mechanism includes a front cover, which is rotatably connected to the driving shaft and the driven shaft, a pump body shell is installed at one end of the front cover, a rear cover is installed at one end of the pump body shell, a discharge port is provided on the front end face of the pump body shell, and a suction port is provided on the rear end face of the pump body shell, and the front cover, pump body shell and rear cover are fixedly connected by four studs.

[0009] Preferably, an oil seal is provided between the driving shaft and the front cover, the oil seal is connected to the front cover via an elastic retaining spring, the front cover is rotatably connected to the driving shaft and the driven shaft via a first sleeve, the rear cover is rotatably connected to the driving shaft and the driven shaft via a second sleeve, and the rotation direction of the driving shaft is clockwise.

[0010] Preferably, one end of the central support rod passes through the first bearing, the limiting ring and the support sleeve in sequence and is connected to the driving shaft and the driven shaft via a positioning column, and the cross-sectional shape of the positioning column is polygonal.

[0011] Preferably, the sealing limit cover is fixedly connected to the back cover, the sealing limit cover is rotatably connected to the center support rod, the center support rod is rotatably connected to the positioning ring via a first bearing, and the back cover is fixedly connected to the two positioning rings.

[0012] Preferably, the center support rod is fixedly connected to the limiting ring, the limiting ring is rotatably connected to the rear cover via a second bearing, the driving shaft and the driven shaft are both fixedly connected to the center support rod via the limiting ring, and the two center support rods are coaxial with the driving shaft and the driven shaft respectively.

[0013] Preferably, a lubrication cavity is provided between the sealing limit cover and the second bearing, and the central support rod is connected to the driving shaft and the driven shaft through a guide channel and the lubrication cavity.

[0014] Preferably, the central support rod is fixedly connected to the support sleeve, the two transmission sleeves are fixedly connected to the driving shaft and the driven shaft, and the support sleeve and the transmission sleeve are mounted by mutually clamping through the support sleeve and the positioning strip.

[0015] A noise reduction method for a low-noise gear pump with a vibration reduction structure comprises the following steps:

[0016] S1: A center hole is machined on the inner side of the driving shaft and the driven shaft so that the two center support mechanisms are installed on the inner side of the center hole. Specifically, two transmission sleeves are fixed on the inner side of the middle of the driving shaft and the driven shaft, and then the center support rod with the support sleeve fixedly installed is inserted into the inner side of the transmission sleeve and positioned and installed with the driving shaft and the driven shaft through the positioning column;

[0017] S2: A plurality of spline rings are provided on the outer surface of the support sleeve, and a plurality of positioning strips are provided on the inner wall of the transmission sleeve, so that the support sleeve and the transmission sleeve are mutually clamped and installed through the spline rings and the positioning strips. At this time, the second bearing and the positioning ring are sequentially placed inside the rear cover, so that the limiting ring is connected to the rear cover through the second bearing, and the positioning ring is connected to the center support rod through the first bearing. Finally, two sealing limiting covers are fixedly connected to the rear cover and the center support rod is limited, so that the axial stability of the center support rod and the driving shaft and the driven shaft can be maintained;

[0018] S3: A lubrication cavity is provided between the sealing limit cover and the second bearing, and lubricating grease is injected into the lubrication cavity. When the power is turned on, the driving shaft is driven to rotate by an external power source, and then the driving shaft drives the driven shaft to mesh and rotate on the inner side of the pump body shell, and the liquid is sucked through the suction port and discharged through the discharge port for pressurized liquid delivery, thereby achieving a pressurized liquid delivery effect. During the rotation of the driving shaft and the driven shaft, the limit ring, the support sleeve, the transmission sleeve and the positioning column synchronously drive the two central support rods to rotate in opposite directions;

[0019] S4: Both ends of the center support rod can be axially fixed through the limit ring and the positioning column. At the same time, the center support rod can support the driving shaft and the driven shaft in the radial direction during operation through the support sleeve and the transmission sleeve, effectively reducing the imbalance of radial forces of the driving shaft and the driven shaft and the large flow pulsation, thereby reducing the noise and vibration of the overall operation. The first bearing and the second bearing are provided at one end of the center support rod close to the sealing limit cover, so that the first bearing and the second bearing can provide two-level support for the center support rod when it rotates, avoiding radial runout of the center support rod;

[0020] S5: A plurality of guide channels are provided at one end of the driving shaft and the driven shaft, and the center support rod and the driving shaft and the driven shaft are connected to the lubrication cavity through the guide channels, so that when the gear pump is running, the lubricating grease in the lubrication cavity can be transported to between the center support rod and the driving shaft and the driven shaft through the guide channels.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention drives the driven shaft to mesh and rotate on the inner side of the pump body shell, and the liquid is sucked through the suction port and discharged through the discharge port for pressurized delivery, thereby achieving the pressurized delivery effect of the liquid. The two ends of the central support rod can be axially fixed through the limit ring and the positioning column. At the same time, the central support rod can support the driving shaft and the driven shaft in the radial direction during operation through the support sleeve, effectively reducing the imbalance of radial force of the driving shaft and the driven shaft and the large flow pulsation, thereby reducing the noise and vibration of the overall operation. The first bearing and the second bearing can provide two-level support for the central support rod when it rotates, thereby avoiding radial runout of the central support rod;

[0023] 2. The present invention provides a lubrication cavity between the sealing limit cover and the second bearing, and lubricating grease is injected into the lubrication cavity. The center support rod and the driving shaft and the driven shaft are connected to the lubrication cavity through a guide channel, so that when the gear pump is running, the lubricating grease in the lubrication cavity can be transported to the center support rod and the driving shaft and the driven shaft through the guide channel, thereby improving the overall operating stability and extending the service life. By centrally supporting the shaft body of the gear pump, the stability of liquid pressurized delivery can be effectively improved, the radial force imbalance and large liquid flow pulsation can be reduced, and the vibration noise of the gear pump can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 A rear side view of the present invention as a whole;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the pump shell of the present invention;

[0027] Figure 4 It is a schematic cross-sectional structure diagram of the present invention as a whole;

[0028] Figure 5 It is a structural schematic diagram of the gear transmission mechanism of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the central support mechanism of the present invention;

[0030] Figure 7 It is a schematic diagram of the exploded cross-section structure of the central support mechanism of the present invention.

[0031] In the figure: 1. pump casing mechanism; 101. front cover; 102. pump casing; 103. rear cover; 104. stud; 105. discharge port; 106. suction port; 2. gear transmission mechanism; 201. driving shaft; 202. driven shaft; 203. first bushing; 204. second bushing; 205. isolation side plate; 206. flow guide channel; 3. center support mechanism; 301. sealing limit cover; 302. positioning ring; 303. first bearing; 304. second bearing; 305. limit ring; 306. center support rod; 307. support sleeve; 308. transmission sleeve; 309. positioning column; 310. spline ring; 311. positioning strip. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] See also Figures 1 to 4 An embodiment of the present invention is as follows: a low-noise gear pump with a vibration reduction structure comprises a gear transmission mechanism 2 and two central support mechanisms 3, a pump casing mechanism 1 is installed on the outer side of the gear transmission mechanism 2, the pump casing mechanism 1 comprises a front cover 101, a pump body shell 102 is installed on one end of the front cover 101, a rear cover 103 is installed on one end of the pump body shell 102, a discharge port 105 is provided on the front end surface of the pump body shell 102, a suction port 106 is provided on the rear end surface of the pump body shell 102, the front cover 101, the pump body shell 102 and the rear cover 103 are fixedly connected by four studs 104, and the driving shaft 201 drives the driven shaft 202 to rotate in meshing engagement on the inner side of the pump body shell 102 to suck in the liquid through the suction port 106 and discharge it through the discharge port 105 for boosted pressure, thereby achieving a boosted liquid delivery effect.

[0034] See also Figures 3 to 6The gear transmission mechanism 2 includes a driving shaft 201, a driven shaft 202 is installed on one side of the driving shaft 201, the front cover 101 is rotatably connected with the driving shaft 201 and the driven shaft 202, gears are fixedly arranged on the outer sides of the middle of the driving shaft 201 and the driven shaft 202, the two gears are connected by tooth meshing, two isolation side plates 205 are fitted at both ends of the two gears, two first shaft sleeves 203 are installed on one side of one isolation side plate 205, and two second shaft sleeves 204 are installed on one side of the other isolation side plate 205, the driving shaft 201 and the driven shaft 202 are close to each other. A plurality of guide channels 206 are provided at one end of the second sleeve 204, an oil seal is provided between the driving shaft 201 and the front cover 101, the oil seal is connected to the front cover 101 by an elastic retaining spring, the front cover 101 is rotatably connected to the driving shaft 201 and the driven shaft 202 by the first sleeve 203, the rear cover 103 is rotatably connected to the driving shaft 201 and the driven shaft 202 by the second sleeve 204, the rotation direction of the driving shaft 201 is clockwise, and the two gears can be laterally blocked by two isolation side plates 205, thereby preventing the liquid from interfering with the surfaces of the driving shaft 201 and the driven shaft 202.

[0035] See also Figures 4 to 7 Two central support mechanisms 3 are installed on the inner side of the gear transmission mechanism 2. The central support mechanism 3 includes a limit ring 305. The limit ring 305 is fixedly connected to the driving shaft 201 and the driven shaft 202. A second bearing 304 is installed on the outer side of the limit ring 305. A positioning ring 302 is installed on one side of the second bearing 304. A first bearing 303 is installed on the inner side of the positioning ring 302. The first bearing 303 and the second bearing 304 can provide two-level support for the central support rod 306 when it rotates, thereby avoiding radial runout of the central support rod 306.

[0036] A central support rod 306 is installed on the inner side of the first bearing 303, the sealing limit cover 301 is fixedly connected to the rear cover 103, the sealing limit cover 301 is rotatably connected to the central support rod 306, the central support rod 306 is rotatably connected to the positioning ring 302 through the first bearing 303, the rear cover 103 is fixedly connected to the two positioning rings 302, a positioning column 309 is installed at one end of the central support rod 306, the central support rod 306 is fixedly connected to the limit ring 305, the limit ring 305 is rotatably connected to the rear cover 103 through the second bearing 304, the driving shaft 201 and the driven shaft 202 are both fixedly connected to the central support rod 306 through the limit ring 305, the two central support rods 306 are coaxial with the driving shaft 201 and the driven shaft 202 respectively, and can maintain the axial stability of the central support rod 306 and the driving shaft 201 and the driven shaft 202;

[0037] One end of the central support rod 306 passes through the first bearing 303, the stop ring 305 and the support sleeve 307 in sequence and is connected to the driving shaft 201 and the driven shaft 202 through a positioning column 309. The cross-sectional shape of the positioning column 309 is polygonal. The central support rod 306 can be positioned by the positioning column 309 to prevent the two central support rods 306 from deflecting relative to the driving shaft 201 and the driven shaft 202.

[0038] The other end of the central support rod 306 is installed with a sealing limit cover 301, a lubrication cavity is provided between the sealing limit cover 301 and the second bearing 304, the central support rod 306 and the driving shaft 201 and the driven shaft 202 are connected with the lubrication cavity through the guide channel 206, a support sleeve 307 is installed on the outer side of one end of the central support rod 306, the outer surface of the support sleeve 307 is provided with a plurality of spline rings 310, and a transmission sleeve 308 is installed on the outer side of the support sleeve 307. The inner wall of the moving sleeve 308 is provided with a plurality of positioning strips 311, the central support rod 306 is fixedly connected to the support sleeve 307, the two transmission sleeves 308 are fixedly connected to the driving shaft 201 and the driven shaft 202, the support sleeve 307 and the transmission sleeve 308 are mutually clamped and installed through the support sleeve 307 and the positioning strips 311, and the central support rod 306 can support the driving shaft 201 and the driven shaft 202 in radial direction during operation through the support sleeve 307 and the transmission sleeve 308.

[0039] A noise reduction method for a low-noise gear pump with a vibration reduction structure comprises the following steps:

[0040] S1: A center hole is machined on the inner side of the driving shaft 201 and the driven shaft 202, so that the two center support mechanisms 3 are installed on the inner side of the center hole. Specifically, two transmission sleeves 308 are fixed on the inner side of the middle of the driving shaft 201 and the driven shaft 202, and then the center support rod 306 fixed with the support sleeve 307 is inserted into the inner side of the transmission sleeve 308 and positioned and installed with the driving shaft 201 and the driven shaft 202 through the positioning column 309;

[0041] S2: A plurality of spline rings 310 are provided on the outer surface of the support sleeve 307, and a plurality of positioning strips 311 are provided on the inner wall of the transmission sleeve 308, so that the support sleeve 307 and the transmission sleeve 308 are mutually clamped and installed through the spline rings 310 and the positioning strips 311. At this time, the second bearing 304 and the positioning ring 302 are sequentially placed into the inner side of the rear cover 103, so that the limiting ring 305 is connected to the rear cover 103 through the second bearing 304, and the positioning ring 302 is connected to the center support rod 306 through the first bearing 303. Finally, the two sealing limiting covers 301 are fixedly connected to the rear cover 103 and the center support rod 306 is limited, so that the axial stability of the center support rod 306 and the driving shaft 201 and the driven shaft 202 can be maintained;

[0042] S3: A lubrication cavity is provided between the sealing limit cover 301 and the second bearing 304, and lubricating grease is injected into the lubrication cavity. The power is turned on, and the driving shaft 201 is driven to rotate by an external power source. Then, the driving shaft 201 drives the driven shaft 202 to mesh and rotate on the inner side of the pump body shell 102, and the liquid is sucked through the suction port 106 and discharged through the discharge port 105 for boosting pressure, so as to achieve a boosting and conveying effect on the liquid. During the rotation of the driving shaft 201 and the driven shaft 202, the two central support rods 306 are synchronously driven to rotate in opposite directions by the limit ring 305, the support sleeve 307, the transmission sleeve 308 and the positioning column 309;

[0043] S4: The two ends of the center support rod 306 can be kept axially fixed through the limit ring 305 and the positioning column 309. At the same time, the center support rod 306 can support the driving shaft 201 and the driven shaft 202 in the radial direction during operation through the support sleeve 307 and the transmission sleeve 308, effectively reducing the radial force imbalance and large flow pulsation of the driving shaft 201 and the driven shaft 202, thereby reducing the noise and vibration of the overall operation. The first bearing 303 and the second bearing 304 are provided at one end of the center support rod 306 close to the sealing limit cover 301, so that the first bearing 303 and the second bearing 304 can provide two-level support for the center support rod 306 when it rotates, thereby avoiding radial runout of the center support rod 306;

[0044] S5: A plurality of guide channels 206 are provided at one end of the driving shaft 201 and the driven shaft 202, and the center support rod 306 and the driving shaft 201 and the driven shaft 202 are connected to the lubrication cavity through the guide channels 206, so that when the gear pump is running, the lubricating grease in the lubrication cavity can be transported to between the center support rod 306 and the driving shaft 201 and the driven shaft 202 through the guide channels 206, thereby improving the overall operation stability and extending the service life.

[0045] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A low-noise gear pump with a vibration reduction structure, comprising a gear transmission mechanism (2) and two central support mechanisms (3), characterized in that: A pump housing mechanism (1) is installed on the outer side of the gear transmission mechanism (2), two central support mechanisms (3) are installed on the inner side of the gear transmission mechanism (2), the gear transmission mechanism (2) comprises a driving shaft (201), a driven shaft (202) is installed on one side of the driving shaft (201), gears are fixedly provided on the outer sides of the middle parts of the driving shaft (201) and the driven shaft (202), and the two gears are connected by tooth meshing; The central support mechanism (3) comprises a limiting ring (305), the limiting ring (305) is fixedly connected to both the driving shaft (201) and the driven shaft (202), a second bearing (304) is installed on the outer side of the limiting ring (305), a positioning ring (302) is installed on one side of the second bearing (304), a first bearing (303) is installed on the inner side of the positioning ring (302), a central support rod (306) is installed on the inner side of the first bearing (303), and the central A positioning column (309) is installed at one end of the central support rod (306), and a sealing limit cover (301) is installed at the other end of the central support rod (306). A support sleeve (307) is installed on the outer side of one end of the central support rod (306), and a plurality of spline rings (310) are provided on the outer surface of the support sleeve (307). A transmission sleeve (308) is installed on the outer side of the support sleeve (307), and a plurality of positioning strips (311) are provided on the inner wall of the transmission sleeve (308).

2. A low-noise gear pump with a vibration reduction structure according to claim 1, characterized in that: The gear transmission mechanism (2) further comprises two isolation side plates (205) fitted with the two ends of the two gears, one side of one of the isolation side plates (205) being fitted with two first shaft sleeves (203), and one side of the other isolation side plate (205) being fitted with two second shaft sleeves (204), and a plurality of guide channels (206) being provided at one end of the driving shaft (201) and the driven shaft (202) close to the second shaft sleeves (204).

3. A low-noise gear pump with a vibration reduction structure according to claim 2, characterized in that: The pump casing mechanism (1) comprises a front cover (101), wherein the front cover (101) is rotatably connected to a driving shaft (201) and a driven shaft (202); a pump casing (102) is mounted on one end of the front cover (101); a rear cover (103) is mounted on one end of the pump casing (102); a liquid discharge port (105) is provided on the front end surface of the pump casing (102); and a suction port (106) is provided on the rear end surface of the pump casing (102); the front cover (101), the pump casing (102) and the rear cover (103) are fixedly connected via four studs (104).

4. A low-noise gear pump with a vibration reduction structure according to claim 3, characterized in that: An oil seal is provided between the driving shaft (201) and the front cover (101); the oil seal is connected to the front cover (101) via an elastic retaining spring; the front cover (101) is rotatably connected to the driving shaft (201) and the driven shaft (202) via a first shaft sleeve (203); the rear cover (103) is rotatably connected to the driving shaft (201) and the driven shaft (202) via a second shaft sleeve (204); and the rotation direction of the driving shaft (201) is clockwise.

5. A low-noise gear pump with a vibration reduction structure according to claim 4, characterized in that: One end of the central support rod (306) passes through the first bearing (303), the limiting ring (305) and the support sleeve (307) in sequence and is connected to the driving shaft (201) and the driven shaft (202) via a positioning column (309), and the cross-sectional shape of the positioning column (309) is polygonal.

6. A low-noise gear pump with a vibration reduction structure according to claim 5, characterized in that: The sealing limit cover (301) is fixedly connected to the rear cover (103), the sealing limit cover (301) is rotatably connected to the central support rod (306), the central support rod (306) is rotatably connected to the positioning ring (302) via a first bearing (303), and the rear cover (103) is fixedly connected to the two positioning rings (302).

7. A low-noise gear pump with a vibration reduction structure according to claim 6, characterized in that: The central support rod (306) is fixedly connected to the limiting ring (305), and the limiting ring (305) is rotatably connected to the rear cover (103) via a second bearing (304). Both the driving shaft (201) and the driven shaft (202) are fixedly connected to the central support rod (306) via the limiting ring (305), and the two central support rods (306) are coaxial with the driving shaft (201) and the driven shaft (202), respectively.

8. A low-noise gear pump with a vibration reduction structure according to claim 7, characterized in that: A lubrication cavity is provided between the sealing limit cover (301) and the second bearing (304), and the central support rod (306) and the driving shaft (201) and the driven shaft (202) are all connected to the lubrication cavity via a guide channel (206).

9. A low-noise gear pump with a vibration reduction structure according to claim 8, characterized in that: The central support rod (306) is fixedly connected to the support sleeve (307), the two transmission sleeves (308) are fixedly connected to the driving shaft (201) and the driven shaft (202), and the support sleeve (307) and the transmission sleeve (308) are mutually clamped and installed through the support sleeve (307) and the positioning strip (311).

10. A noise reduction method for a low-noise gear pump with a vibration reduction structure, characterized in that: A noise reduction method for a low-noise gear pump with a vibration reduction structure according to any one of claims 1 to 9 comprises the following steps: S1: Center holes are machined on the inner sides of the driving shaft (201) and the driven shaft (202), so that the two center support mechanisms (3) are installed on the inner sides of the center holes. Specifically, two transmission sleeves (308) are fixed on the inner sides of the middle parts of the driving shaft (201) and the driven shaft (202), and then the center support rod (306) fixed with the support sleeve (307) is inserted into the inner side of the transmission sleeve (308) and positioned and installed with the driving shaft (201) and the driven shaft (202) through the positioning column (309); S2: A plurality of spline rings (310) are provided on the outer surface of the support sleeve (307), and a plurality of positioning strips (311) are provided on the inner wall of the transmission sleeve (308), so that the support sleeve (307) and the transmission sleeve (308) are mutually clamped and installed through the spline rings (310) and the positioning strips (311). At this time, the second bearing (304) and the positioning ring (302) are sequentially placed into the inner side of the rear cover (103), so that the limiting ring (305) and the rear cover (103) are connected through the second bearing (304), and the positioning ring (302) and the center support rod (306) are connected through the first bearing (303). Finally, the two sealing limiting covers (301) are fixedly connected to the rear cover (103) and the center support rod (306) is limited, so that the axial stability of the center support rod (306) and the driving shaft (201) and the driven shaft (202) can be maintained; S3: A lubrication cavity is provided between the sealing limit cover (301) and the second bearing (304), and lubricating grease is injected into the lubrication cavity. The power is turned on, and the driving shaft (201) is driven to rotate by an external power source. Then, the driving shaft (201) drives the driven shaft (202) to mesh and rotate on the inner side of the pump body shell (102), and the liquid is sucked in through the suction port (106) and discharged through the discharge port (105) with increased pressure, thereby achieving a pressurized liquid delivery effect. During the rotation of the driving shaft (201) and the driven shaft (202), the limit ring (305), the support sleeve (307), the transmission sleeve (308) and the positioning column (309) synchronously drive the two central support rods (306) to rotate in opposite directions; S4: The two ends of the central support rod (306) can be axially fixed by means of the limit ring (305) and the positioning column (309). At the same time, the central support rod (306) can support the driving shaft (201) and the driven shaft (202) in the radial direction during operation through the support sleeve (307) and the transmission sleeve (308), thereby effectively reducing the radial force imbalance and large flow pulsation of the driving shaft (201) and the driven shaft (202), thereby reducing the noise and vibration of the overall operation. The first bearing (303) and the second bearing (304) are provided at one end of the central support rod (306) close to the sealing limit cover (301), so that the first bearing (303) and the second bearing (304) can provide two-level support for the central support rod (306) during rotation, thereby avoiding radial runout of the central support rod (306); S5: A plurality of guide channels (206) are provided at one end of the driving shaft (201) and the driven shaft (202), and the central support rod (306) and the driving shaft (201) and the driven shaft (202) are connected to the lubrication cavity through the guide channels (206), so that when the gear pump is running, the lubricating grease in the lubrication cavity can be transported to the central support rod (306) and the driving shaft (201) and the driven shaft (202) through the guide channels (206).

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