Gear pump device

Abstract

The utility model discloses a gear pump device and relates to the technical field of gear pump machinery. The utility model provides an efficient gear pump structure which achieves the purpose of improving the efficiency of a gear pump under high-speed and high-pressure working conditions by improving a sliding bearing, a floating side plate and a shell structure of the gear pump and optimizing a circulation mode of oil lubrication in the gear pump.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear pump machinery, and in particular relates to a gear pump device. Background Art

[0002] At present, in the aerospace fuel system, the existing high-speed and high-pressure gear pumps need to increase the clearance between the tooth tops of the driving gear and the driven gear and the housing to avoid the bore sweeping due to the unbalanced radial force, which leads to increased leakage and reduced efficiency. At the same time, due to the weight and volume restrictions of the fuel system, the radial force cannot be balanced by increasing the sliding bearing. For this reason, the utility model is provided with a high-efficiency gear pump structure. Utility Model Content

[0003] The purpose of the utility model is to provide a high-efficiency gear pump structure, by improving the sliding bearing, floating side plate and housing structure of the gear pump, optimizing the circulation mode of oil lubrication inside the gear pump, and achieving the purpose of improving the efficiency of the gear pump under high-speed and high-pressure working conditions.

[0004] In view of this, according to one aspect of the embodiment of the utility model, a gear pump device is provided, comprising: a driving gear 1, an oil seal 2, a sliding bearing 3, a driven gear 4, a floating side plate 5, a housing 6, a rear cover 7, and a special-shaped gasket 8; wherein the housing 6 and the rear cover 7 are fixedly connected; the driving gear 1 is connected to the motor through a spline; an oil seal 2 is installed on the shaft of the driving gear 1 to prevent liquid leakage; the driving gear 1 and the driven gear 4 are meshed at the gear cavity of the housing 6; the gear pump oil outlet channel 6-3 is perpendicular to the gear pump installation surface; the floating side plate 5 is a plate structure, one side of which is provided with a balancing groove 5-1; the other side is provided with a high The floating side plate 5 is provided with an oil guide groove 5-2; oil guide grooves 5-3 are also provided on both sides of the floating side plate 5; the housing 6 is provided with a sliding bearing 3, which is a cylindrical structure with a spiral groove 3-1 on the inner side and is installed opposite to the rotation direction of the gear shaft; an oil guide pool 6-2 is provided at the bottom of the sliding bearing 3 hole, and a special-shaped gasket 8 is arranged in the high-pressure oil guide groove 5-2, and oil is introduced from the outlet high-pressure chamber 11 into the high-pressure oil guide groove 5-2 on the back side of the contact surface between the floating side plate 5 and the end faces of the driving gear 1 and the driven gear 4. Under the sealing effect of the special-shaped gasket 8, the floating side plate 5 is always in close contact with the end faces of the driving gear 1 and the driven gear 4 under different pressure conditions.

[0005] Optionally, when the gear pump is working, the sliding bearing 3 and the gear shaft are lubricated by introducing oil through the spiral groove 3-1. The spiral grooves 3-1 of the sliding bearings 3 at different installation positions have different rotation directions, so that the oil in the spiral groove 3-1 flows to the oil groove 5-3 of the floating side plate, forming an oil circulation inside the gear pump.

[0006] Optionally, when the gear pump is working, the floating side plate 5 connects the oil with gradually changing pressure in the gear transition area 10 through the balance groove 5-1, so that the oil pressure in the area connected by the balance groove 5-1 is equal, thereby adjusting the size and direction of the radial force on the gear.

[0007] Optionally, the housing 6 and the rear cover 7 are positioned by cylindrical pins and connected by screws.

[0008] Optionally, the oil inlet of the lubrication channel is the gear pump inlet oil pool 6-2, and the bottom of the oil pool 6-2 has a first oil channel 6-4 leading to the oil pool under the sliding bearing 3 at the end of the housing 6 on the driving gear 1 side, and a second oil channel 6-5 leading to the oil pool under the sliding bearing 3 at the end of the housing 6 on the driven gear 4 side.

[0009] Optionally, the low-pressure oil enters the oil pool at the lower side of the housing 6 of the driving gear 1 and the driven gear 4 through the first oil passage 6-4 and the second oil passage 6-5. Under the suction force of the gear meshing and oil suction on the oil inlet side, the low-pressure oil is sucked out from the oil pool at the lower side of the housing 6 along the spiral groove 3-1 between the gear shaft and the sliding bearing 3 to lubricate the sliding bearing 3 on the housing 6 side, and finally returns to the low-pressure end of the gear pump inlet through the oil groove 5-3 from the floating side plate 5.

[0010] Optionally, the low-pressure oil enters the oil pool on the lower side of the sliding bearing 3 at the end of the rear cover 7 along the inner hole of the gear. Similarly, under the suction force of the gear meshing and oil suction on the oil inlet side, the low-pressure oil is sucked out from the oil pool on the lower side of the rear cover 7 along the spiral groove 3-1 between the gear shaft and the sliding bearing 3, lubricating the sliding bearing 3 on the side of the rear cover 7, and finally returns to the low-pressure end of the gear pump inlet through the floating side plate 5 through the oil groove 5-3.

[0011] Optionally, the working fluid flows into the gear meshing area inside the gear pump through the oil inlet 6-1 of the housing 6, and the spaces between the teeth in the gear pump inlet area 9 are filled with low-pressure working fluid. The driving gear 1 meshes and rotates with the driven gear 4, and the teeth squeeze the working fluid between the teeth toward the outlet high-pressure chamber 11, forming pressure, and the working fluid flows to the downstream pipeline through the oil outlet channel 6-3 of the housing 6.

[0012] Optionally, the floating side plate 5 is connected to the oil with gradually changing pressure in the transition area 10 by opening a balancing groove with the groove edge of the oil inlet end 5-4 at 40° to the axis and the groove edge of the oil outlet end 5-5 at 60° to the axis.

[0013] Through the above structure, the efficiency of the gear pump under high-speed and high-pressure working conditions is finally increased from 70% to 75%, effectively improving the overall efficiency of the gear pump under high-speed and high-pressure working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a high-efficiency gear pump of the utility model;

[0015] Figure 2 Schematic diagram of the internal pressure division of the gear pump;

[0016] Figure 3 This is a schematic diagram of the sliding bearing of the utility model;

[0017] Figure 4 It is a schematic diagram of the floating side plate of the utility model;

[0018] Figure 5 It is a schematic diagram of the housing of the utility model;

[0019] Figure 6 This is a schematic cross-sectional view of the oil passage of the housing of the utility model;

[0020] Figure 7 This is a schematic diagram of the oil circulation lubrication flow channel of the utility model.

[0021] 1-driving gear, 2-oil seal, 3-sliding bearing, 4-driven gear, 5-floating side plate, 6-housing, 7-rear cover, 8-special-shaped gasket, 9-gear pump inlet area, 10-transition area, 11-high-pressure chamber, 12-low-pressure oil, 3-1-spiral groove, 5-1-balance groove, 5-2-high-pressure oil guide groove, 5-3-oil groove, 5-4-oil inlet end, 5-5-oil outlet end, 6-1-oil inlet, 6-2-oil pool, 6-3-oil outlet channel, 6-4-first oil passage channel, 6-5-second oil passage channel. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model provides a high-efficiency gear pump structure comprising:

[0024] The gear pump is mainly composed of a driving gear 1, an oil seal 2, a sliding bearing 3, a driven gear 4, a floating side plate 5, a housing 6, a rear cover 7, a special-shaped gasket 8, etc. The driving gear 1 is connected to the motor through a spline; an oil seal 2 is installed on the shaft of the driving gear 1 to prevent liquid leakage; the driving gear 1 and the driven gear 4 are meshed at the gear cavity of the housing 6; the gear pump oil outlet channel 6-3 is perpendicular to the gear pump installation surface; the floating side plate 5 is a plate structure, one side is provided with a balance groove 5-1, and the other side is provided with a high-pressure oil guide groove 5-2; the two sides of the floating side plate 5 are also provided with oil grooves 5-3; the housing 6 is installed with a sliding bearing 3, which is a cylindrical structure with a spiral groove 3-1 on the inner side and is installed oppositely according to the rotation direction of the gear shaft; an oil pool 6-2 is provided at the bottom of the sliding bearing 3 hole, and a special-shaped gasket 8 is arranged in the high-pressure oil guide groove 5-2, and oil is introduced from the outlet high-pressure cavity 11 into the high-pressure oil guide groove 5-2 on the back side of the contact surface between the floating side plate 5 and the end faces of the driving gear 1 and the driven gear 4. Under the sealing effect of the special-shaped gasket 8, the floating side plate 5 is always tightly attached to the end faces of the driving gear 1 and the driven gear 4 under different pressure conditions.

[0025] Furthermore, the gear pump is an external meshing gear pump with a two-stage structure, wherein the housing 6 and the rear cover 7 are positioned by cylindrical pins and connected by screws. Furthermore, the driving gear 1 is connected to the motor by a spline.

[0026] Furthermore, the working fluid flows into the gear meshing area inside the gear pump through the oil inlet 6-1 of the housing 6, and the space between the teeth is filled with low-pressure working fluid in the gear pump inlet area 9. The driving gear 1 and the driven gear 4 mesh and rotate, and the teeth squeeze the working fluid between the teeth to the outlet high-pressure chamber 11, forming a certain pressure, thereby giving energy to the working fluid, and flowing to the lower-level pipeline through the oil outlet channel 6-3 of the housing 6. In order to improve the volumetric efficiency of the gear pump, the floating side plate 5 with the end face clearance automatic compensation structure is adopted to reduce end face leakage.

[0027] Furthermore, oil is introduced from the outlet high-pressure chamber 11 into the high-pressure oil guide groove 5-2 on the back side of the contact surface between the floating side plate 5 and the end faces of the driving gear 1 and the driven gear 4. Under the sealing effect of the special-shaped gasket 8, the floating side plate 5 is always in close contact with the end faces of the driving gear 1 and the driven gear 4 under different pressure conditions, thereby realizing automatic compensation of the end face gap and reducing end face leakage.

[0028] Furthermore, the sliding bearing 3 and the gear shaft are lubricated by introducing oil through the spiral groove 3-1. The spiral groove 3-1 of the sliding bearing 3 at different installation positions has different rotation directions, so that the oil in the spiral groove 3-1 flows to the oil groove 5-3 of the floating side plate, forming an oil circulation inside the gear pump.

[0029] Furthermore, the oil inlet of the lubrication flow channel is the gear pump inlet oil pool 6-2, and the bottom of the oil pool 6-2 has a first oil passage 6-4 leading to the oil pool under the sliding bearing 3 at the end of the housing 6 on the driving gear 1 side, and a second oil passage 6-5 leading to the oil pool under the sliding bearing 3 at the end of the housing 6 on the driven gear 4 side. The low-pressure oil 12 enters the oil pool under the housing 6 end of the driving and driven gears through the passage, and under the suction force of the meshing oil suction of the gears on the oil inlet side, the low-pressure oil is sucked out from the oil pool under the housing 6 along the spiral groove 3-1 between the gear shaft and the sliding bearing 3, lubricates the sliding bearing 3 on the housing 6 side, and finally returns to the low-pressure end of the gear pump inlet through the oil groove 5-3 of the floating side plate 5.

[0030] Furthermore, at the same time, the low-pressure oil enters the oil pool at the lower side of the sliding bearing 3 at the end of the rear cover 7 along the inner hole of the gear. Similarly, under the suction force of the meshing oil suction of the gear on the oil inlet side, the low-pressure oil is sucked out from the oil pool at the lower side of the rear cover 7 along the spiral groove 3-1 between the gear shaft and the sliding bearing 3, lubricating the sliding bearing 3 on the side of the rear cover 7, and finally returns to the low-pressure end of the gear pump inlet through the oil groove 5-3 from the floating side plate 5. This is the gear pump oil circulation lubrication flow channel, which can circulate the low-pressure oil 12 in the gear pump inlet area 9, and finally reduce the friction loss of each friction pair and improve the mechanical efficiency.

[0031] Furthermore, under the high-speed and high-pressure working condition of the gear pump, the floating side plate 5 is connected to the oil in the transition area 10 by opening a balance groove with the groove edge of the oil inlet end 5-4 at 40 degrees to the axis and the groove edge of the oil outlet end 5-5 at 60 degrees to the axis, so as to make the oil pressure in the area connected by the balance groove equal and adjust the size and direction of the radial force on the gear. Thus, the gap between the tooth top and the housing is reduced, leakage is reduced, and volumetric efficiency is increased.

[0032] Through the above structure, the efficiency of the gear pump under high-speed and high-pressure working conditions is finally increased from 70% to 75%, effectively improving the overall efficiency of the gear pump under high-speed and high-pressure working conditions.

[0033] The above is only a specific embodiment of the utility model, and the utility model is described in detail. The undetailed part is conventional technology. However, the protection scope of the utility model is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. The protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A gear pump device, characterized in that: include: A driving gear (1), an oil seal (2), a sliding bearing (3), a driven gear (4), a floating side plate (5), a housing (6), a rear cover (7), and a special-shaped gasket (8); wherein the housing (6) and the rear cover (7) are fixedly connected; the driving gear (1) is connected to the motor via a spline; an oil seal (2) is installed on the shaft of the driving gear (1) to prevent liquid leakage; the driving gear (1) and the driven gear (4) are meshed at the gear cavity of the housing (6); the gear pump oil outlet channel (6-3) is perpendicular to the gear pump installation surface; the floating side plate (5) is a plate-type structure, one side of which is provided with a balancing groove (5-1); the other side of which is provided with a high-pressure oil guide groove (5-2); the floating side plate (5) is provided with a plurality of Oil grooves (5-3) are also provided on both sides; the housing (6) is installed with a sliding bearing (3), which is a cylindrical structure with a spiral groove (3-1) provided on the inner side and is installed opposite to each other according to the rotation direction of the gear shaft; an oil pool (6-2) is provided at the bottom of the hole of the sliding bearing (3); a special-shaped gasket (8) is arranged in the high-pressure oil introduction groove (5-2), and oil is introduced from the outlet high-pressure chamber (11) into the high-pressure oil introduction groove (5-2) on the back side of the contact surface between the floating side plate (5) and the end surface of the driving gear (1) and the driven gear (4); under the sealing effect of the special-shaped gasket (8), the floating side plate (5) is always in close contact with the end surface of the driving gear (1) and the driven gear (4) under different pressure conditions.

2. The device according to claim 1, characterized in that When the gear pump is working, the sliding bearing (3) and the gear shaft are lubricated by introducing oil through the spiral groove (3-1). The spiral grooves (3-1) of the sliding bearings (3) at different installation positions have different rotation directions, so that the oil in the spiral groove (3-1) flows to the oil groove (5-3) of the floating side plate, forming an oil circulation inside the gear pump.

3. The device according to claim 1, characterized in that When the gear pump is working, the floating side plate (5) is connected to the oil with gradually changing pressure in the gear transition area (10) through the balance groove (5-1), so that the oil pressure in the area connected by the balance groove (5-1) is equalized, thereby adjusting the size and direction of the radial force on the gear.

4. The device according to claim 1, characterized in that The gear pump is an external meshing gear pump with a two-stage structure; the housing (6) and the rear cover (7) are positioned by cylindrical pins and connected by screws.

5. The device according to claim 2, characterized in that The oil inlet of the lubrication channel is the gear pump inlet oil pool (6-2), and the bottom of the oil pool (6-2) is provided with a first oil channel (6-4) leading to the oil pool below the sliding bearing (3) at the housing (6) end on the driving gear (1) side, and a second oil channel (6-5) leading to the oil pool below the sliding bearing (3) at the housing (6) end on the driven gear (4) side.

6. The device according to claim 5, characterized in that The low-pressure oil enters the oil pool at the lower side of the housing (6) of the driving gear (1) and the driven gear (4) through the first oil passage (6-4) and the second oil passage (6-5). Under the suction force of the meshing oil suction of the oil inlet side gears, the low-pressure oil is sucked out from the oil pool at the lower side of the housing (6) along the spiral groove (3-1) between the gear shaft and the sliding bearing (3), lubricates the sliding bearing (3) on the housing (6) side, and finally returns to the low-pressure inlet end of the gear pump through the oil groove (5-3) of the floating side plate (5).

7. The device according to claim 6, characterized in that The low-pressure oil enters the oil pool at the lower side of the sliding bearing (3) at the rear cover (7) end along the inner hole of the gear. Similarly, under the suction force of the meshing oil suction of the gear on the oil inlet side, the low-pressure oil is sucked out from the oil pool at the lower side of the rear cover (7) along the spiral groove (3-1) between the gear shaft and the sliding bearing (3), lubricates the sliding bearing (3) on the rear cover (7) side, and finally returns to the low-pressure inlet end of the gear pump through the oil groove (5-3) from the floating side plate (5).

8. The device according to claim 1, characterized in that The working fluid flows into the gear meshing area inside the gear pump through the oil inlet (6-1) of the housing (6), and the spaces between the teeth are filled with low-pressure working fluid in the gear pump inlet area (9). The driving gear (1) and the driven gear (4) mesh and rotate, and the teeth squeeze the working fluid between the teeth toward the outlet high-pressure chamber (11), thereby generating pressure, and the working fluid flows to the downstream pipeline through the oil outlet channel (6-3) of the housing (6).

9. The device according to claim 1, characterized in that The floating side plate (5) is connected to the oil with gradually changing pressure in the transition area (10) through a balance groove with a groove edge at an angle of 40° to the axis at the oil inlet end (5-4) and a groove edge at an angle of 60° to the axis at the oil outlet end (5-5).

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