CN217813911U

CN217813911U - Constant-pressure gear pump

Info

Publication number: CN217813911U
Application number: CN202222290162.6U
Authority: CN
Inventors: 邹云斌; 刘招
Original assignee: Lonking Jiangxi Machinery Co ltd
Current assignee: Lonking Jiangxi Machinery Co ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-11-15
Anticipated expiration: 2032-08-30

Abstract

The utility model discloses a constant voltage gear pump, including the pump cover and the pump body, pump cover sealing connection is on pump body left end face, pump inner chamber upper portion is equipped with driving gear axle, the lower part is equipped with driven gear shaft, driving gear number and modulus homogeneous phase with driven gear, and intermeshing, it is main, the driven gear both sides all are equipped with the curb plate, the pump cover, curb plate and pump body inboard wall form airtight space, it is main, driven gear meshing line separates into the oil absorption chamber of the last front side of each other's intercommunication and the oil extraction chamber of lower rear side again this airtight space, be equipped with the oil inlet on the pump body on the lateral surface before and communicate with each other with oil absorption chamber, right-hand member face is equipped with the oil-out and communicates with each other with the oil extraction chamber, oil extraction chamber right-hand member is equipped with the overflow valve. The utility model discloses under gear pump full load work suppressed the pressure state, when pulse pressure in the twinkling of an eye was higher than rated pressure 5-7MPa, the pressure release will be opened to the overflow valve, makes oil extraction chamber pressure stable in rated pressure within range, has effectively prevented pulse high pressure damage gear pump in the twinkling of an eye, has prolonged gear pump life.

Description

Constant-pressure gear pump

Technical Field

The utility model relates to a gear pump technical field, concretely relates to constant voltage gear pump for engineering machine tool work hydraulic system.

Background

The conventional gear pump for a loader working hydraulic system has the characteristics that due to the full-load work of a loader and the inherent characteristics of the gear pump, the rated pressure of an oil outlet of a high-pressure gear pump reaches 25MPa in normal work, the pressure value is gradually increased and the pulse instantaneous pressure can averagely reach 30MPa in a pressure-holding state when the full-load work is carried out, the pulse instantaneous pressure is generally higher than the rated pressure within 5-7MPa, and the pulse instantaneous pressure can be higher than the rated pressure and can be higher than 7MPa in a pressure impact state under the impact of a large flow rate state, so that the gear pump is subjected to large flexible deformation by a high-pressure impact gear shaft, a pump body is seriously swept and bored, the cleanliness of a system is influenced, and the internal leakage of the gear pump is increased, and the fault of the gear pump is weak is caused.

SUMMERY OF THE UTILITY MODEL

For solving above-mentioned current gear pump can exceed 7 MPa's pressure impact under large-traffic state strikes, cause the gear pump gear to receive high-pressure impact gear shaft to produce great flexible deformation, the boring is seriously swept to the pump body, influence system cleanliness and the interior problem of leaking increase, inequality that causes the gear pump, the utility model provides a constant voltage gear pump.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a constant voltage gear pump, includes the pump cover and the pump body, pump cover sealing connection is on pump body left end face, pump body inner chamber upper portion is equipped with driving gear axle, and the lower part is equipped with driven gear shaft, be equipped with the driving gear in the middle of the driving gear axle, be equipped with in the middle of the driven gear shaft with the driving gear mesh and with the number of teeth, with the driven gear of modulus, the driving gear all is equipped with the curb plate with the driven gear both sides, pump cover, curb plate and pump body inboard wall form airtight space, driving gear and driven gear meshing line separate into the oil absorption chamber of the last front side of each other intercommunication and the oil extraction chamber of lower rear side again this airtight space, be equipped with the oil inlet on the preceding lateral surface on the pump body and inhale the oil chamber and communicate with each other, and the right-hand member face is equipped with the oil-out and communicates with each other its characterized in oil extraction chamber: the right end of the oil discharge cavity is provided with an overflow valve which is used for automatically opening the overflow valve to release pressure when the instantaneous pulse pressure is 5-7MPa higher than the rated pressure, so that the gear pump is prevented from being damaged by instantaneous pulse high-pressure impact.

Furthermore, a boss extending towards the right is arranged on the rear side of the right end of the pump body, the overflow valve is arranged on the front side face of the boss, an oil inlet of the overflow valve is communicated with the oil discharge cavity, an oil return channel is arranged in the pump body, one end of the oil return channel is communicated with an oil outlet of the overflow valve, the other end of the oil return channel is communicated with the oil suction cavity, and when the overflow valve is opened for pressure relief, oil in the oil discharge cavity is distributed and returned to the oil suction cavity through the overflow valve and the oil return channel, so that the purpose of pressure relief is achieved.

Furthermore, sealing pieces are arranged on the left end face of the left side plate and the right end face of the right side plate for sealing.

Furthermore, the outer circular surfaces of the left side plate on the driving gear shaft and the driven gear shaft are rotatably connected with the inner side wall of the pump cover through needle roller bearings, and the outer circular surfaces of the right side plate on the driving gear shaft and the driven gear shaft are rotatably connected with the inner side wall of the pump body through needle roller bearings.

Furthermore, a deep groove ball bearing is further arranged between the outer circle surface of the right end of the driving gear shaft and the inner side wall of the pump cover, and an oil seal is further arranged on the right side of the deep groove ball bearing on the driving gear shaft.

Compared with the prior art, the beneficial effects of the utility model are that: the gear teeth in the front side oil suction cavity on the pump body are gradually separated, the volume of a working space is gradually increased to form vacuum, oil in the oil tank enters the oil inlet under the action of atmospheric pressure and then enters the oil suction cavity, the oil sucked into the interdental space is brought to the oil discharge cavity on the lower rear side along with the meshing rotation of the driving gear and the driven gear in the closed space, the volume of the working space is gradually reduced due to the gradual meshing of the gear teeth on the lower side, the oil between the interdental space is extruded and is output from the oil outlet through the oil pipe, the pressure of the overflow valve is set to be the rated pressure of the gear pump, when the gear pump works under full load and is in a pressure-holding state, the pressure value is gradually increased and the pulse instantaneous pressure is higher than the rated pressure by 5-7MPa, the overflow valve is opened, a part of the oil in the oil discharge cavity is discharged from the overflow valve and flows back to the oil suction cavity through the oil outlet and the oil return passage of the overflow valve, the instantaneous pulse high pressure of the system is relieved through the overflow valve, the pressure of the oil discharge cavity is stabilized within the rated pressure range, the instantaneous pulse high-pressure of the gear pump, the instantaneous pulse high-pressure gear pump is effectively prevented from being damaged, and the service life of the gear pump is prolonged.

Drawings

FIG. 1 is a schematic sectional view of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of P-P in FIG. 1.

In the figure: 1. the oil pump comprises a pump cover, 2, a pump body, 201, an oil inlet, 202, an oil suction cavity, 203, an oil discharge cavity, 204, an oil outlet, 205, a boss, 206, a backflow channel, 3, a driving gear shaft, 301, a driving gear, 4, a driven gear shaft, 401, a driven gear, 5, a side plate, 6, a sealing element, 7, an overflow valve, 8, a needle bearing, 9, an oil seal, 10 and a deep groove ball bearing.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the embodiment of the utility model provides a pump cover 1 and the pump body 2, pump cover 1 sealing connection is on the 2 left end faces of the pump body, 2 inner chamber upper portions of the pump body are equipped with driving gear shaft 3, the lower part is equipped with driven gear shaft 4, be equipped with driving gear 301 in the middle of driving gear shaft 3, be equipped with in the middle of driven gear shaft 4 with driving gear 301 meshing and with the number of teeth, driven gear 401 with the modulus, driving gear 301 all is equipped with curb plate 6 with driven gear 401 both sides, pump cover 1, curb plate 6 and the 2 inboard wall of the pump body form airtight space, driving gear 301 and driven gear 401's meshing line separates this airtight space into the last front side inhale oil chamber 202 and the oil extraction chamber 203 of lower rear side that do not communicate with each other again, be equipped with oil inlet 201 on the last front lateral surface of the pump body 2 and inhale oil chamber 202 and communicate with each other, the right-hand member face is equipped with oil outlet 204 and discharges oil chamber 203 and communicates with each other, it is equipped with overflow valve 7 to discharge chamber 203 right-hand member for when pulse instantaneous pressure is higher than rated pressure 5-7MPa, overflow valve 7 will open the pressure automatically, prevent that the gear pump instantaneous pulse high pressure from damaging.

Furthermore, a boss 205 extending towards the right is arranged on the rear side of the right end of the pump body 2, the overflow valve 7 is arranged on the front side face of the boss 205, an oil inlet of the overflow valve 7 is communicated with the oil discharge cavity 203, an oil return channel 206 is arranged in the pump body 2, one end of the oil return channel 206 is communicated with an oil outlet of the overflow valve 7, the other end of the oil return channel 206 is communicated with the oil suction cavity 202, when the overflow valve 7 is opened for pressure relief, oil distributed in the oil discharge cavity 203 returns to the oil suction cavity 202 through the overflow valve 7 and the oil return channel 206, and therefore the purpose of pressure relief is achieved.

Further, a left end surface of the left side plate 5 and a right end surface of the right side plate 5 are provided with a sealing member 6 for sealing.

Furthermore, the driving gear shaft 3 and the driven gear shaft 4 are rotatably connected with the inner side wall of the pump cover 1 through the needle bearing 8 on the outer circumferential surface of the left side plate 5, and the driving gear shaft 3 and the driven gear shaft 4 are rotatably connected with the inner side wall of the pump body 2 through the needle bearing 8 on the outer circumferential surface of the right side plate 5.

Furthermore, a deep groove ball bearing 10 is further arranged between the outer circular surface of the right end of the driving gear shaft 3 and the inner side wall of the pump cover 1, and an oil seal 9 is further arranged on the right side of the deep groove ball bearing 10 on the driving gear shaft 3.

The utility model discloses a working method: the driving gear shaft 3 rotates in the direction shown in fig. 2 in the enclosed space of the gear pump, gear teeth meshed with the driving gear 301 and the driven gear 401 in the oil suction cavity 202 are gradually separated, the volume of the working space is gradually increased to form vacuum, oil in the oil tank enters the oil suction cavity 202 through the oil inlet 201 under the action of atmospheric pressure, the oil enters tooth grooves of the driving gear 301 and the driven gear 401, the oil sucked into tooth spaces is driven to the oil discharge cavity 203 on the lower rear side along with the rotation of the gears in the enclosed space, the volume of the working space is gradually reduced due to the gradual meshing of the gear teeth on the lower side, and therefore the oil in the tooth spaces is extruded and output from the oil outlet 204, and when the gears rotate ceaselessly, the oil suction cavity and the oil discharge cavity continuously complete oil suction and oil discharge processes, and pressure oil is conveyed to a hydraulic system. When the gear pump is subjected to factory test, the pressure of the overflow valve 7 is set to be the rated pressure of the pump body 2, when the pressure value is gradually increased and the pulse instantaneous pressure is 5-7MPa higher than the rated pressure during full-load work, the overflow valve 7 is opened, part of oil in the oil discharge cavity 203 is discharged from the overflow valve 7 and flows back to the oil suction cavity 202 through the oil outlet of the overflow valve 7 and the oil return channel 206, the instantaneous pulse high pressure of the system is relieved through the overflow valve 7, the pressure of the oil discharge cavity 203 is stabilized within the rated pressure range, the problems of abnormal increase of the system pressure and work failure caused by damage to the gear pump due to the instantaneous pulse high pressure are effectively solved, and the service life of the gear pump is prolonged.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a constant voltage gear pump, includes the pump cover and the pump body, pump cover sealing connection is on pump body left end face, pump body inner chamber upper portion is equipped with driving gear axle, and the lower part is equipped with driven gear shaft, be equipped with the driving gear in the middle of the driving gear axle, be equipped with in the middle of the driven gear shaft with the driving gear engaged with and with the number of teeth, with the driven gear of modulus, the driving gear all is equipped with the curb plate with the driven gear both sides, pump cover, curb plate and pump body inboard wall form airtight space, driving gear and driven gear meshing line separate into the last front side's of each other not communicating oil absorption chamber and the oil extraction chamber of lower rear side again to this airtight space, be equipped with the oil inlet on the preceding lateral surface of the pump body and communicate with each other with oil absorption chamber, be equipped with the oil-out on the right-hand member face and communicate with each other its characterized in that communicates with oil extraction chamber: the right end of the oil discharge cavity is provided with an overflow valve which is used for automatically opening to release pressure when the instantaneous pulse pressure is 5-7MPa higher than the rated pressure, so that the instantaneous pulse high-pressure impact is prevented from damaging the gear pump.

2. The constant pressure gear pump of claim 1, wherein: the rear side of the right end of the pump body is provided with a boss extending towards the right, the overflow valve is arranged on the front side face of the boss, an oil inlet of the overflow valve is communicated with the oil exhaust cavity, an oil return channel is arranged in the pump body, one end of the oil return channel is communicated with an oil outlet of the overflow valve, the other end of the oil return channel is communicated with the oil suction cavity, and when the overflow valve is opened to release pressure, oil distributed in the oil exhaust cavity returns to the oil suction cavity through the overflow valve and the oil return channel, so that the pressure release purpose is achieved.

3. The constant pressure gear pump of claim 1, wherein: sealing pieces are arranged on the left end face of the left side plate and the right end face of the right side plate for sealing.

4. The constant pressure gear pump of claim 1, wherein: the driving gear shaft and the driven gear shaft are rotatably connected with the inner side wall of the pump cover through needle roller bearings on the left outer circular surface of the left side plate, and the driving gear shaft and the driven gear shaft are rotatably connected with the inner side wall of the pump body through needle roller bearings on the right outer circular surface of the right side plate.

5. The constant pressure gear pump of claim 1, wherein: a deep groove ball bearing is arranged between the outer circle surface of the right end of the driving gear shaft and the inner side wall of the pump cover, and an oil seal is further arranged on the right side of the deep groove ball bearing on the driving gear shaft.