Low-noise gear pump with damping structure and noise reduction method thereof

Abstract

The present application relates to gear pump technical field, concretely is a kind of low-noise gear pump with vibration reduction structure and its noise reduction method, solve the existing gear pump when running, gear to liquid pressure delivery can cause radial force impact to shaft body, further cause shaft body radial force imbalance, and liquid flow process pulsation is big, and cause the problem of vibration noise, including gear transmission mechanism and two center support mechanism, the outside of gear transmission mechanism is equipped with pump shell mechanism, the inside of gear transmission mechanism is equipped with two center support mechanism, gear transmission mechanism includes driving shaft, the side of driving shaft is equipped with driven shaft, the outside of the middle of driving shaft and driven shaft is fixed with gear.The shaft body of gear pump is supported in the center by the present application, the stability of liquid pressure delivery can be effectively improved, the condition of radial force imbalance and liquid flow pulsation is reduced, and then the vibration noise of gear pump is effectively weakened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear pumps, in particular to a low-noise gear pump with a damping structure and a noise reduction method thereof. BACKGROUND

[0002] A gear pump is a rotary pump that relies on the change and movement of the working volume between the pump cylinder and the meshing gear to transport liquid or pressurize it. The gear pump is driven by an independent motor, which can effectively block the pressure pulsation and flow fluctuation upstream. The mature technology, durable quality, energy-saving effect, and diverse models of the gear pump industry have been widely recognized in various industries. Various enterprises are continuously investing a large amount of funds and efforts in technical upgrading, and the gear pump industry is entering a more prosperous stage with higher quality and better performance.

[0003] The existing gear pump causes radial force impact on the shaft body when the gear pressurizes and transports liquid, which leads to unbalanced radial force of the shaft body and large pulsation and vibration noise during liquid flow. Therefore, it does not meet the existing needs, and for this purpose, a low-noise gear pump with a damping structure and a noise reduction method thereof are proposed. SUMMARY

[0004] The purpose of the present application is to provide a low-noise gear pump with a damping structure and a noise reduction method thereof to solve the problem of unbalanced radial force of the shaft body caused by the radial force impact on the shaft body when the gear pressurizes and transports liquid, and large pulsation and vibration noise during liquid flow.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a low-noise gear pump with a damping structure, comprising a gear transmission mechanism and two center support mechanisms, the outer side of the gear transmission mechanism is provided with a pump housing mechanism, the inner side of the gear transmission mechanism is provided with two center support mechanisms, the gear transmission mechanism comprises a driving shaft, the side of the driving shaft is provided with a driven shaft, the outer side of the middle part of the driving shaft and the driven shaft is fixedly provided with a gear, the two gears are connected through intermeshing;

[0006] The center support mechanism comprises a limiting ring, the limiting ring is fixedly connected with the driving shaft and the driven shaft, the outer side of the limiting ring is provided with a second bearing, the side of the second bearing is provided with a positioning ring, the inner side of the positioning ring is provided with a first bearing, the inner side of the first bearing is provided with a center support rod, one end of the center support rod is provided with a positioning column, the other end of the center support rod is provided with a sealing limiting cover, the outer side of one end of the center support rod is provided with a support sleeve, the outer surface of the support sleeve is provided with a plurality of spline rings, the outer side of the support sleeve is provided with a transmission sleeve, and the inner wall of the transmission sleeve is provided with a plurality of positioning strips.

[0007] Preferably, the gear transmission mechanism further comprises two isolation side plates fitted with both ends of the two gears, one side of one of the isolation side plates is provided with two first shaft sleeves, one side of the other isolation side plate is provided with two second shaft sleeves, and the driving shaft and the driven shaft are provided with a plurality of flow guide channels at one end close to the second shaft sleeves.

[0008] Preferably, the pump shell mechanism comprises a front cover rotatably connected with the driving shaft and the driven shaft, one end of the front cover is provided with a pump body shell, one end of the pump body shell is provided with a rear cover, the front end surface of the pump body shell is provided with a liquid outlet, and the rear end surface of the pump body shell is provided with a suction inlet, and the front cover, the pump body shell and the rear cover are fixedly connected through four stud bolts.

[0009] Preferably, an oil seal is arranged between the driving shaft and the front cover, the oil seal is connected with the front cover through an elastic clamp spring, the front cover is rotatably connected with the driving shaft and the driven shaft through the first shaft sleeve, the rear cover is rotatably connected with the driving shaft and the driven shaft through the second shaft sleeve, and the rotation direction of the driving shaft is clockwise.

[0010] Preferably, one end of the central support rod sequentially penetrates the first bearing, the limiting ring and the support sleeve, and is connected with the driving shaft and the driven shaft through the positioning column, and the cross-sectional shape of the positioning column is polygonal.

[0011] Preferably, the sealing limiting cover is fixedly connected with the rear cover, the sealing limiting cover is rotatably connected with the central support rod, the central support rod is rotatably connected with the limiting ring through the first bearing, and the rear cover is fixedly connected with the two limiting rings.

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

[0013] Preferably, a lubricating cavity is arranged between the sealing limiting cover and the second bearing, and the central support rod is connected with the lubricating cavity through the flow guide channel.

[0014] Preferably, the central support rod is fixedly connected with the support sleeve, the two transmission sleeves are fixedly connected with the driving shaft and the driven shaft, and the support sleeve and the transmission sleeve are mutually clamped and installed through the support sleeve and the positioning strip.

[0015] A noise reduction method of a low-noise gear pump with a vibration reduction structure, comprising the following steps:

[0016] S1: The center holes are processed on the inner sides of the driving shaft and the driven shaft, so that the two center support mechanisms are installed on the inner sides of the center holes, specifically, the two transmission sleeve pipes are fixed on the inner sides of the middle parts of the driving shaft and the driven shaft, and then the center support rods fixedly installed with the support sleeve pipes are inserted into the inner sides of the transmission sleeve pipes and are fixedly installed with the driving shaft and the driven shaft through the positioning columns;

[0017] S2: The plurality of spline rings are arranged on the outer surface of the support sleeve pipe, and the plurality of positioning strips are arranged on the inner wall of the transmission sleeve pipe, so that the support sleeve pipe and the transmission sleeve pipe 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 arranged in the inner side of the rear cover, so that the limiting ring is connected with the rear cover through the second bearing, the positioning ring is connected with the center support rod through the first bearing, and finally the two sealing limiting covers are fixedly connected with the rear cover and limit the center support rod, so that the axial stability of the center support rod and the driving shaft and the driven shaft can be maintained;

[0018] S3: The lubricating cavity is arranged between the sealing limiting cover and the second bearing, the lubricating oil is injected into the inner part of the lubricating cavity, the power supply is connected, the driving shaft is driven to rotate through the external power source, and then when the driving shaft drives the driven shaft to mesh and rotate in the inner side of the pump body shell, the liquid is sucked through the suction port and is discharged through the discharge port, so that the pressurized conveying effect of the liquid is realized, and in the rotating process of the driving shaft and the driven shaft, the two center support rods are synchronously driven to rotate in opposite directions through the limiting ring, the support sleeve pipe, the transmission sleeve pipe and the positioning column;

[0019] S4: The two ends of the center support rod can be axially fixed through the limiting ring and the positioning column, and the center support rod can support the driving shaft and the driven shaft in the radial direction through the support sleeve pipe and the transmission sleeve pipe, so that the radial force imbalance and the large flow pulsation of the driving shaft and the driven shaft are effectively reduced, and then the noise and vibration of the overall operation are reduced, and the first bearing and the second bearing are arranged at the end of the center support rod close to the sealing limiting cover, so that the center support rod can be supported in two stages through the first bearing and the second bearing when rotating, and the radial jumping of the center support rod is avoided;

[0020] S5: A plurality of flow guide channels are arranged at one end of the driving shaft and the driven shaft, and the center support rod is connected with the lubricating cavity through the flow guide channels and the lubricating cavity, so that the lubricating oil in the lubricating cavity can be conveyed to the center support rod and the driving shaft and the driven shaft through the flow guide channels when the gear pump operates.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] 1、The present application drives the driven shaft on the inside of the pump body shell to mesh and rotate, through the suction port to suck liquid and through the liquid discharge port to pressurize and discharge, realizing the pressurized delivery effect of the liquid, the two ends of the center support rod can be axially fixed through the limiting ring and the positioning column, and the center support rod can support the radial direction of the driving shaft and the driven shaft during operation through the support sleeve, effectively reducing the radial force imbalance and large flow pulsation of the driving shaft and the driven shaft, thereby reducing the overall operation noise and vibration, and the first bearing and the second bearing can support the center support rod during rotation, avoiding the radial jumping of the center support rod;

[0023] 2、The present application is provided with a lubricating cavity between the sealing limiting cover and the second bearing, lubricating oil is injected into the inside of the lubricating cavity, and the center support rod is connected with the lubricating cavity through the flow guide channel between the driving shaft and the driven shaft, so that the lubricating oil in the lubricating cavity can be delivered to the center support rod and the driving shaft and the driven shaft through the flow guide channel during the operation of the gear pump, thereby improving the overall operation stability and prolonging the service life, the shaft body of the gear pump is centrally supported, which can effectively improve the stability of the liquid pressurized delivery, reduce the radial force imbalance and large liquid flow pulsation, and effectively reduce the vibration noise of the gear pump. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall structure diagram of the present application;

[0025] Figure 2 It is the rear view of the overall structure of the present application;

[0026] Figure 3 It is the cross-sectional structure diagram of the pump body shell of the present application;

[0027] Figure 4 It is the cross-sectional structure diagram of the overall structure of the present application;

[0028] Figure 5 It is the structure diagram of the gear transmission mechanism of the present application;

[0029] Figure 6 It is the structure diagram of the center support mechanism of the present application;

[0030] Figure 7 It is the cross-sectional exploded structure diagram of the center support mechanism of the present application.

[0031] In the figure: 1. Pump casing mechanism; 101. Front cover; 102. Pump body shell; 103. Rear cover; 104. Stud; 105. Discharge port; 106. Suction port; 2. Gear transmission mechanism; 201. Driving shaft; 202. Driven shaft; 203. First shaft sleeve; 204. Second shaft sleeve; 205. Isolation side plate; 206. Diversion channel; 3. Center support mechanism; 301. Sealing limit cover; 302. Positioning ring; 303. First bearing; 304. Second bearing; 305. Positioning 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 clearly and completely described 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 , the present invention provides an embodiment: a low-noise gear pump with a vibration reduction structure, including a gear transmission mechanism 2 and two central support mechanisms 3, a pump casing mechanism 1 is installed on the outside of the gear transmission mechanism 2, the pump casing mechanism 1 includes a front cover 101, one end of the front cover 101 is installed with a pump body shell 102, one end of the pump body shell 102 is installed with a rear cover 103, the front end surface of the pump body shell 102 is provided with a discharge port 105, and the rear end surface of the pump body shell 102 is provided with a suction port 106, the front cover 101, the pump body shell 102 and the rear end surface of the pump body shell 102 are fixedly connected by four studs 104, and the driving shaft 201 drives the driven shaft 202 to engage and rotate 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 comprises a driving shaft 201, one side of the driving shaft 201 is provided with a driven shaft 202, the front cover 101 is rotationally connected with the driving shaft 201 and the driven shaft 202, the outer side of the middle part of the driving shaft 201 and the driven shaft 202 is fixedly provided with a gear, the two gears are connected through the meshing of the gears, the two ends of the two gears are abutted and mounted with two isolation side plates 205, one side of one of the isolation side plates 205 is mounted with two first shaft sleeves 203, one side of the other isolation side plate 205 is mounted with two second shaft sleeves 204, the end of the driving shaft 201 and the driven shaft 202 close to the second shaft sleeve 204 is provided with a plurality of flow guide channels 206, the oil seal is arranged between the driving shaft 201 and the front cover 101, the oil seal is connected with the front cover 101 through the elastic clamping spring, the front cover 101 is rotationally connected with the driving shaft 201 and the driven shaft 202 through the first shaft sleeve 203, the rear cover 103 is rotationally connected with the driving shaft 201 and the driven shaft 202 through the second shaft sleeve 204, the rotation direction of the driving shaft 201 is clockwise, the two gears can be laterally blocked through the two isolation side plates 205, so as to avoid the interference of the liquid to the surface of the driving shaft 201 and the driven shaft 202.

[0035] Please refer to Figures 4 to 7 The inner side of the gear transmission mechanism 2 is mounted with two center support mechanisms 3, the center support mechanism 3 comprises a limiting ring 305, the limiting ring 305 is fixedly connected with the driving shaft 201 and the driven shaft 202, the outer side of the limiting ring 305 is mounted with a second bearing 304, one side of the second bearing 304 is mounted with a positioning ring 302, the inner side of the positioning ring 302 is mounted with a first bearing 303, the rotation of the center support rod 306 can be supported by the first bearing 303 and the second bearing 304 in two stages, so as to avoid the radial jumping of the center support rod 306;

[0036] The inner side of the first bearing 303 is mounted with a center support rod 306, the sealing limiting cover 301 is fixedly connected with the rear cover 103, the sealing limiting cover 301 is rotationally connected with the center support rod 306, the center support rod 306 is rotationally connected with the positioning ring 302 through the first bearing 303, the rear cover 103 is fixedly connected with the two positioning rings 302, one end of the center support rod 306 is mounted with a positioning column 309, the center support rod 306 is fixedly connected with the limiting ring 305, the limiting ring 305 is rotationally connected with the rear cover 103 through the second bearing 304, the driving shaft 201 and the driven shaft 202 are fixedly connected with the center support rod 306 through the limiting ring 305, the two center support rods 306 are coaxial with the driving shaft 201 and the driven shaft 202, so as to keep the axial stability of the center support rod 306, the driving shaft 201 and the driven shaft 202;

[0037] One end of the center support rod 306 penetrates the first bearing 303, the limiting ring 305 and the support sleeve 307 in turn and is connected with the driving shaft 201 and the driven shaft 202 through the positioning column 309, the cross-sectional shape of the positioning column 309 is polygonal, the center support rod 306 can be positioned through the positioning column 309, and the two center support rods 306 are prevented from being deflected relative to the driving shaft 201 and the driven shaft 202;

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

[0039] A noise reduction method of a low-noise gear pump with a vibration reduction structure, comprising the following steps:

[0040] S1: center holes are machined in 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, the two transmission sleeves 308 are fixedly installed on the inner sides of the middle parts of the driving shaft 201 and the driven shaft 202, then the center support rod 306 fixedly installed with the support sleeve 307 is inserted into the inner side of the transmission sleeve 308 and is 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 arranged on the outer surface of the support sleeve 307, and a plurality of positioning strips 311 are arranged 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 limiting ring 302 are sequentially arranged in the inner side of the rear cover 103, so that the limiting ring 305 is connected with the rear cover 103 through the second bearing 304, the limiting ring 302 is connected with the center support rod 306 through the first bearing 303, and finally the two sealing limiting covers 301 are fixedly connected with the rear cover 103 and limit the center support rod 306, so as to keep the axial stability of the center support rod 306, the driving shaft 201 and the driven shaft 202;

[0042] S3: A lubricating cavity is arranged between the sealing limiting cover 301 and the second bearing 304, lubricating grease is injected into the interior of the lubricating cavity, the power supply is connected, 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 inside of the pump body shell 102, the liquid is sucked in through the suction port 106 and is pressurized and discharged through the liquid discharge port 105, the pressurized conveying effect of the liquid is realized, and the two center support rods 306 are synchronously driven to rotate in opposite directions by the limiting ring 305, the support sleeve 307, the transmission sleeve 308 and the positioning column 309 during the rotation of the driving shaft 201 and the driven shaft 202;

[0043] S4: The two ends of the center support rod 306 can be axially fixed through the limiting ring 305 and the positioning column 309, and the center support rod 306 can support the radial direction of the driving shaft 201 and the driven shaft 202 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, and then reducing the noise and vibration of the overall operation, and the end of the center support rod 306 close to the sealing limiting cover 301 is provided with the first bearing 303 and the second bearing 304, so that the center support rod 306 can be supported by two stages through the first bearing 303 and the second bearing 304 during rotation, avoiding radial jumping of the center support rod 306;

[0044] S5: A plurality of flow guide channels 206 are arranged 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 through the flow guide channels 206 and the lubricating cavity, so that the lubricating grease in the lubricating cavity can be conveyed to the center support rod 306 and the driving shaft 201 and the driven shaft 202 through the flow guide channels 206 during the operation of the gear pump, thereby improving the overall operation stability and prolonging the service life.

[0045] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and not limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of the equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

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), and 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), and gears are fixed 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 inter-tooth meshing; The central support mechanism (3) includes 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 support mechanism (305) is fixedly connected to the driving shaft (201) and the driven shaft (202). A positioning column (309) is installed at one end of the central support rod (306), 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 outside of one end of the central support rod (306), 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 outside of the support sleeve (307), and a plurality of positioning strips (311) are provided on the inner wall of the transmission sleeve (308); The gear transmission mechanism (2) further comprises two isolation side plates (205) fitted with the two ends of the two gears, wherein one side of the isolation side plates (205) is fitted with two first shaft sleeves (203), and the other side of the isolation side plates (205) is fitted with two second shaft sleeves (204), and a plurality of guide channels (206) are provided on one end of the driving shaft (201) and the driven shaft (202) close to the second shaft sleeves (204); The sealing limit cover (301) is fixedly connected to the rear cover (103); A lubrication cavity is provided between the sealing limit cover (301) and the second bearing (304), and the central support rod (306), the driving shaft (201), and the driven shaft (202) are all connected to the lubrication cavity via a guide channel (206).

2. A low-noise gear pump with a vibration reduction structure according to claim 1, characterized in that: The pump housing 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 housing (102) is mounted on one end of the front cover (101); a rear cover (103) is mounted on one end of the pump housing (102); a liquid discharge port (105) is provided on the front end face of the pump housing (102); and a suction port (106) is provided on the rear end face of the pump housing (102); and the front cover (101), the pump housing (102) and the rear cover (103) are fixedly connected via four studs (104).

3. A low-noise gear pump with a vibration-damping structure according to claim 2, characterized in that: An oil seal is provided between the driving shaft (201) and the front cover (101), and 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). The rotation direction of the driving shaft (201) is clockwise.

4. The low-noise gear pump with a vibration reduction structure according to claim 3, characterized in that: One end of the central support rod (306) is connected to both 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.

5. The low-noise gear pump with a vibration reduction structure according to claim 4, characterized in that: 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).

6. The low-noise gear pump with a vibration reduction structure according to claim 5, 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). The driving shaft (201) and the driven shaft (202) are both 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.

7. The 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 support sleeve (307), and 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 multiple spline rings (310) and positioning strips (311) on the outer surface of the support sleeve (307).

8. A noise reduction method for a low-noise gear pump with a vibration reduction structure, characterized in that: The noise reduction method of a low-noise gear pump with a vibration reduction structure according to any one of claims 1 to 7 comprises the following steps: 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 part 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 engaged 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 on 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 central 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 central support rod (306) is limited, thereby maintaining the axial stability of the central support rod (306) and the driving shaft (201) and the driven shaft (202); 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 engage 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 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); S4: Both ends of the central support rod (306) can be kept axially fixed by means of the limiting 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 supporting 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. A first bearing (303) and a second bearing (304) are provided at one end of the central support rod (306) close to the sealing limiting cover (301), so that the first bearing (303) and the second bearing (304) can provide two-stage 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 each 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 all connected to the lubrication cavity via 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 central support rod (306) and the driving shaft (201) and the driven shaft (202) via the guide channels (206).

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