CN107939671A - A kind of tandem low pulse crescent gear pump with error angle - Google Patents

Abstract

The invention discloses a kind of tandem low pulse crescent gear pump with error angle.The connection of front gear babinet is installed between protecgulum and connected body, the connection of backgear babinet is installed between rear cover and connected body, front gear babinet is identical with backgear body structure, including front axle tray, housing, rear axle tray, gear shaft and linkage gear axis are coaxially connected, power is input to gear shaft, drives linkage gear axis to carry out moment of torsion transmission by gear shaft；Gear shaft and linkage gear axis are the multidiameter structure being mainly made of preceding shaft part, rear shaft part and gear segment, the gear segment of gear shaft and linkage gear axis is set in front gear babinet and rear gear box body, and the gear segment of gear shaft and linkage gear axis is installed in gear housing by moon teething ring component.The present invention can be so that exit flow pulsation reduction by more than 65%, realizes the purpose for reducing gear pump outlet flow pulsation.

Description

A series low pulsation internal gear pump with misalignment angle

technical field

The invention relates to an internal meshing gear pump, in particular to a serial low-pulsation internal meshing gear pump with misalignment angle.

Background technique

Internal gear pumps are widely used in injection molding machinery, marine machinery, and precision machine tools due to their compact structure, low noise level, and small outlet pressure pulsation. However, with the increasing proportion of "intelligent manufacturing" in traditional industries, the requirements for control precision of precision machine tools are getting higher and higher. Therefore, higher requirements are put forward for the outlet pulsation of internal gear pumps. It is required that the outlet flow of the internal gear pump is more stable and the pulsation value is smaller, so as to achieve higher precision control.

At the same time, in hydraulic components, the noise is mainly divided into two parts: fluid noise and structure noise. The fluid noise of the internal gear pump is mainly caused by the pulsation of the outlet flow of the pump. By further reducing the pulsation of the outlet flow of the pump, the noise level of the pump can be further reduced, which is also in line with the current social development theme of "green manufacturing".

There are two main methods to reduce the flow pulsation at the outlet of the internal meshing gear pump. One is to optimize the design parameters of the internal meshing gear pair, including the number of teeth, modulus, coefficient of variation, etc.; the other is to optimize the design parameters of the floating side plate. Optimizing the hole structure on it. However, these two methods will increase the complexity of the processing flow and reduce the stability of the processing technology; moreover, these two methods have no obvious effect on reducing the outlet flow pulsation. Therefore, there is an urgent need for an internal gear pump structure that is simple in structure, does not increase the complexity of the processing flow, does not reduce the stability of the processing process, and can greatly reduce the flow pulsation.

Contents of the invention

Aiming at the shortcomings of current methods for reducing outlet flow pulsation of internal gear pumps, the purpose of the present invention is to provide a serial low-pulsation internal gear pump with misalignment angle, which can greatly reduce the outlet flow pulsation of internal gear pumps.

The technical scheme adopted in the present invention is:

The invention includes a front cover, a coupling body, a rear cover, a front gear box and a rear gear box, the front gear box is connected and installed between the front cover and the coupling body, and the rear gear box is connected and installed between the back cover and the coupling body Between the front cover, the front gear case, the connecting body, the rear gear case and the rear cover are connected and fixed by bolt components; the front gear case and the rear gear case have the same structure, including the front bearing plate, the shell, and the rear bearing plate , the front bearing disc and the rear bearing disc are respectively placed on both sides of the housing, the driving gear shaft and the linkage gear shaft are respectively installed in the front gear case and the rear gear case, and the drive gear shaft and the linkage gear shaft are connected coaxially, Power is input to the drive gear shaft, and the drive gear shaft drives the linkage gear shaft for torque transmission.

Both the driving gear shaft and the linkage gear shaft are stepped shaft structures mainly composed of the front shaft section, the rear shaft section and the gear section. The gear section is located between the front shaft section and the rear shaft section and has the largest diameter. The driving gear shaft and the linkage gear shaft The gear sections are set in the front gear box and the rear gear box respectively, the end of the front shaft section of the drive gear shaft passes through the front bearing plate of the front gear box and passes through the front cover to connect with the external power source, and the rear of the drive gear shaft The end of the shaft section passing through the rear bearing plate of the front gear box and the end of the linkage gear shaft after the front shaft section passes through the front bearing plate of the rear gear box are connected coaxially through a spline coupling, and the rear of the linkage gear shaft The shaft section passes through the rear bearing plate of the rear gear box and extends into the rear cover; the gear sections of the driving gear shaft and the linkage gear shaft are all installed in the respective gear boxes through the crescent ring assembly.

The crescent ring assembly includes an outer ring gear, a crescent block, a floating side plate and a crescent pin. The outer ring gear is placed in the gear box, and the gear segments of the driving gear shaft or the linkage gear shaft are all set in the outer ring gear. The outer teeth of the outer gear and the inner teeth of the outer ring gear are meshed for transmission connection, and there is a gap between the gear segment and the outer ring gear, and a crescent block is installed in the gap between the gear segment and the outer ring gear, and the crescent block is along the axial direction of the gear segment The cross-section is crescent-shaped, and there are floating side plates between the end faces of the gear segment and the outer ring ring and the front bearing plate and the rear bearing plate respectively. Both ends of the crescent block are axially connected by crescent pins and floating side plates. The pins are inserted into the inner walls of the front bearing disc and the rear bearing disc. At the same time, the crescent block and the floating side plate play a certain sealing role.

The drive gear shaft and the linkage gear shaft are coaxially fixedly connected by a spline coupling, and the teeth of the gear segment of the drive gear shaft and the linkage gear shaft in the circumferential direction do not overlap along the axial direction of the gear segment, and there is a misalignment angle

A shaft seal is arranged between the front shaft section of the drive gear shaft and the front cover.

The front shaft sections of the drive gear shaft and the linkage gear shaft are connected together with the front bearing disk through sliding bearings, and the rear shaft sections of the drive gear shaft and the linkage gear shaft are connected together with the rear bearing disk through sliding bearings.

Both the housings in the front gear case and the rear gear case are provided with two ports, which are respectively used as an oil suction port and an oil discharge port for oil suction and oil discharge of the pump.

There is a misalignment angle between the two sets of internal meshing gear pairs, so that there is a phase difference in the flow generated by the gear pairs. When two streams of flow with phase difference merge and superimpose, by adjusting the phase angle reasonably, the flow pulsation at the outlet can be reduced by more than 65%, achieving the purpose of reducing the flow pulsation at the gear pump outlet.

The beneficial effects of the present invention are:

The present invention uses two sets of internal meshing gear pair structures with misalignment angles in the circumferential direction, and the two sets of gear pair structures mesh and rotate at the same speed, and the generated flow has the same pulsation law and pulsation period.

Moreover, the present invention can reasonably adjust the misalignment angle, so that when the flows generated by the two sets of gear pairs merge, the peaks and troughs are superimposed, thereby achieving the purpose of greatly reducing the flow pulsation at the outlet of the internal meshing gear pump.

Description of drawings

Fig. 1 is a structural sectional view of the internal gear pump of the present invention.

Fig. 2 is a schematic diagram of the misalignment angle of the front and rear gear pairs of the internal gear pump of the present invention.

Fig. 3 is a schematic cross-sectional view of the structure of the internal gear pump of the present invention.

Fig. 4 is a schematic diagram of flow pulsation generated by two groups of gear pairs in the present invention.

Fig. 5 is an effect diagram of reducing outlet flow pulsation by adjusting the misalignment angle in the present invention.

In the figure: 1. Crescent block, 2. Drive gear shaft, 3. Shaft seal, 4. Front cover, 5. Front bearing plate, 6. Housing, 7. Front ring gear, 8. Rear bearing plate, 9. Slide Bearing, 10. coupling body, 11. spline coupling, 12. linkage gear shaft, 13. rear ring gear, 14. rear cover, 15. bolt assembly, 16. floating side plate, 17. crescent pin.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the present invention includes a crescent block 1, a drive gear shaft 2, a shaft seal 3, a front cover 4, a front bearing disc 5, a housing 6, a front ring gear 7, a rear bearing disc 8, a sliding bearing 9, a coupling Body 10, spline coupling 11, linkage gear shaft 12, rear ring gear 13, rear cover 14 and bolt assembly 15.

The front gear box and the rear gear box have the same structure, and both include a front bearing disc 5, a housing 6, and a rear bearing disc 8. The front bearing disc 5 and the rear bearing disc 8 are respectively placed on the front and rear sides of the housing 6, and the front cover 4. The coupling body 10 , the rear cover 14 , and the front bearing disc 5 , the casing 6 , and the rear bearing disc 8 of the front and rear gear boxes are connected and installed together through bolt assemblies 15 .

The drive gear shaft 2 and the linkage gear shaft 12 are installed in the front gear case and the rear gear case respectively, and the drive gear shaft 2 and the linkage gear shaft 12 are coaxially connected, and the power is input to the drive gear shaft 2, and the drive gear shaft 2 Drive the linkage gear shaft 12 for torque transmission.

As shown in Figure 1, both the driving gear shaft 2 and the linkage gear shaft 12 are stepped shaft structures mainly composed of a front shaft section, a rear shaft section and a gear section, and the gear section is located between the front shaft section and the rear shaft section and has the largest diameter. , the gear sections of the drive gear shaft 2 and the linkage gear shaft 12 are set in the front gear case and the rear gear case respectively, and the front shaft section of the drive gear shaft 2 passes through the end of the front bearing disc 5 of the front gear case and passes through The front cover 4 is connected with an external power source, and the front cover 4 is provided with a through hole that allows the driving gear shaft 2 to pass through, and the rear shaft section of the driving gear shaft 2 passes through the rear end of the rear bearing plate 8 of the front gear box and the linkage gear The end of the front shaft section of the shaft 12 passing through the front bearing disc 5 of the rear gear box is coaxially connected through a spline coupling 11, and the rear shaft section of the linkage gear shaft 12 passes through the rear bearing disc 8 of the rear gear box and extends into In the back cover 14, the back cover 14 is closed and does not open the through hole.

A shaft seal 3 is provided between the front shaft section of the driving gear shaft 2 and the front cover 4, and the front shaft sections of the driving gear shaft 2 and the linkage gear shaft 12 are connected together with the front bearing plates 5 of the respective gear boxes through sliding bearings 9 , the rear shaft sections of the drive gear shaft 2 and the linkage gear shaft 12 are all connected together with the rear bearing discs 8 of the respective gear boxes through sliding bearings 9 .

As shown in FIG. 2 , the gear segments of the driving gear shaft 2 and the linkage gear shaft 12 are installed in respective gear boxes through the crescent ring assembly. The crescent ring assembly includes the outer ring gear, the crescent block 12, the floating side plate 16 and the crescent pin 17. The outer ring gear is placed in the gear box, and the gear segments of the drive gear shaft 2 or the linkage gear shaft 12 are all set in the outer ring gear. The outer teeth of the gear segment and the inner teeth of the outer ring gear are in meshing transmission connection, and there is a gap between the gear segment and the outer ring gear. The diameter of the index circle of the gear segment is smaller than the diameter of the index circle of the outer ring gear. The crescent block 12 is installed in the gap between the ring gears. The cross section of the crescent block 12 along the axial direction of the gear segment is crescent-shaped. There is a floating side plate 16, both ends of the crescent block 12 are axially connected to the floating side plate 16 through the crescent pin 17, the crescent pin 17 is parallel to the axial direction of the gear segment, and the crescent pin 17 is inserted into the front bearing plate 5 and the rear bearing plate 8 in the inner wall. Simultaneously, the crescent block 12 and the floating side plate 16 play a certain role of sealing.

As shown in Figure 3, the casing 6 in the front gear case and the rear gear case has two ports, which are respectively used as an oil suction port and an oil discharge port for oil suction and oil discharge of the pump. Both the casing 6 of the front gear case and the oil suction port of the casing 6 of the rear gear case are connected to the same oil source, and the casing 6 of the front gear case and the oil discharge port of the casing 6 of the rear gear case are also connected to the same oil source. Combined output flow in the oil circuit.

In specific implementation, the outer ring gear installed in the front gear case is the front ring gear 7, and the gear section of the drive gear shaft 2 is set in the front ring gear 7; the outer ring gear installed in the rear gear case is the rear ring gear 13, and the linkage The gear segment of the gear shaft 12 is sleeved in the rear ring gear 13 .

The driving gear shaft 2 and the linkage gear shaft 12 are coaxially fixedly connected by the spline coupling 11, and the arrangement of the teeth of the gear section of the driving gear shaft 2 and the linkage gear shaft 12 in the circumferential direction does not overlap along the axial direction of the gear section, and there is a misalignment angle

Concrete implementation work process of the present invention is as follows:

During work, the gear section of the driving gear shaft 2 or the linkage gear shaft 12 rotates around its own central axis, and the crescent block 12 remains fixed due to the connection between the crescent pin 17 and the floating side plate 16, and the maximum thickness of the crescent block 12 in the section is outside The difference between the diameter of the addendum circle of the ring gear and the diameter of the addendum circle of the gear segment, the rotation of the gear segment drives the outer ring gear to rotate around its own central axis.

Since the two sets of internal meshing front and rear gear pairs between the drive gear shaft 2 and the front ring gear 7 and between the linkage gear shaft 12 and the rear ring gear 13 rotate at the same speed, the flow generated by the two sets of gear pairs has the same The pulsation regularity and pulsation period of , as shown in Figure 4. The flow generated by the gear pair is pulsating, and the peaks and troughs are periodically distributed. Since the front and rear gear pairs have a misalignment angle in the circumferential direction Therefore, there is a fixed phase difference between the flow generated by the two sets of gear pairs.

The flow generated by the two sets of gear pairs will merge, and through reasonable design of the misalignment angle The peak of the flow generated by one gear pair can be just in the trough of the flow generated by another set of gear pairs. Through the flow superposition process, the peak and the trough are superimposed, thereby achieving the purpose of greatly reducing the flow pulsation at the pump outlet. As shown in Figure 5, it is an effect diagram of reducing outlet flow pulsation by adjusting the misalignment angle. The dotted line in the figure indicates the outlet flow at the oil discharge port after the front and rear gear pairs are superimposed after the optimal misalignment angle is arranged during the implementation process. The specific implementation The optimal misalignment angle of The solid line in the figure represents the outlet flow at the oil discharge port after the superposition of the front and rear gear pairs without dislocation angle in the implementation process.

It can be seen that the optimal design of the misalignment angle After that, the amplitude of outlet flow pulsation is reduced by more than 65%.

This shows that the present invention can effectively reduce the flow pulsation at the outlet of the internal meshing gear pump, and has outstanding technical effects.

Claims (6)

1. A tandem low-pulsation internal gear pump with misalignment angle, characterized in that: it comprises a front cover (4), a connecting body (10), a rear cover (14), a front gear case and a rear gear case, The front gear case is connected and installed between the front cover (4) and the connecting body (10), the rear gear case is connected and installed between the rear cover (14) and the connecting body (10), the front cover (4), the front gear The case body, coupling body (10), rear gear case body and rear cover (14) are connected and fixed by bolt assembly (15); Body (6), rear bearing disc (8), front bearing disc (5) and rear bearing disc (8) are respectively placed on both sides of the housing (6), and the drive gear shaft (2) and linkage gear shaft (12) They are respectively installed in the front gear box and the rear gear box, and the drive gear shaft (2) and the linkage gear shaft (12) are coaxially connected, and the power is input to the drive gear shaft (2), driven by the drive gear shaft (2) The linkage gear shaft (12) carries out torque transmission; Both the driving gear shaft (2) and the linkage gear shaft (12) are stepped shaft structures mainly composed of a front shaft section, a rear shaft section and a gear section. The gear section is located between the front shaft section and the rear shaft section and has the largest diameter. The gear sections of the gear shaft (2) and the linkage gear shaft (12) are respectively set in the front gear case and the rear gear case, and the front shaft section of the drive gear shaft (2) passes through the front bearing plate (5) of the front gear case The rear end passes through the front cover (4) and is connected with the external power source, and the rear shaft section of the drive gear shaft (2) passes through the rear end of the rear bearing plate (8) of the front gear case and the linkage gear shaft (12) The end of the front shaft section after passing through the front bearing plate (5) of the rear gear box is coaxially connected through a spline coupling (11), and the rear shaft section of the linkage gear shaft (12) passes through the rear bearing plate of the rear gear box (8) Rear stretches in the back cover (14); The gear section of driving gear shaft (2) and linkage gear shaft (12) is all installed in the respective gear box body by crescent ring assembly. 2. A serial low-pulsation internal gear pump with misalignment angle according to claim 1, characterized in that: said crescent ring assembly includes an outer ring gear, a crescent block (12), a floating side plate ( 16) and crescent pin (17), the outer ring gear is placed in the gear box, the gear segments of the driving gear shaft (2) or the linkage gear shaft (12) are all set in the outer ring gear, the outer teeth of the gear segment and the outer ring gear The internal teeth are meshed and connected, and there is a gap between the gear segment and the outer ring gear. The crescent block (12) is installed in the gap between the gear segment and the outer ring gear. The cross-section of the crescent block (12) along the axial direction of the gear segment It is crescent-shaped, and there are floating side plates (16) between the end faces of the gear segment and the outer ring gear and the front bearing disc (5) and the rear bearing disc (8) respectively, and both ends of the crescent block (12) are passed The crescent pin (17) is axially connected with the floating side plate (16), and the crescent pin (17) is inserted into the inner wall of the front bearing disc (5) and the rear bearing disc (8). 3. A tandem low-pulsation internal gear pump with misalignment angle according to claim 2, characterized in that: the drive gear shaft (2) and the linkage gear shaft (12) are connected through a spline coupling (11) Coaxial fixed connection, the arrangement of the teeth of the gear section of the driving gear shaft (2) and the linkage gear shaft (12) in the circumferential direction does not overlap along the axial direction of the gear section, and there is a misalignment angle 4. A tandem low-pulsation internal gear pump with misalignment angle according to claim 1, characterized in that: between the front shaft section of the drive gear shaft (2) and the front cover (4) Shaft seal (3). 5. A tandem low-pulsation internal gear pump with misalignment angle according to claim 1, characterized in that: the front shaft sections of the drive gear shaft (2) and the linkage gear shaft (12) pass through The sliding bearing (9) is connected with the front bearing disc (5), and the rear shaft section of the driving gear shaft (2) and the linkage gear shaft (12) are connected together with the rear bearing disc (8) through the sliding bearing (9) . 6. A tandem low-pulsation internal gear pump with misalignment angle according to claim 1, characterized in that: the housings (6) in the front gear case and the rear gear case have two openings. Two ports are respectively used as oil suction port and oil discharge port for pump oil suction and oil discharge.