CN111997894A

CN111997894A - Gear pump convenient for optimizing set position of unloading groove

Info

Publication number: CN111997894A
Application number: CN202010949685.XA
Authority: CN
Inventors: 杨程
Original assignee: Konsk Pump Suzhou Co ltd
Current assignee: Konsk Pump Suzhou Co ltd
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2020-11-27
Anticipated expiration: 2040-09-10
Also published as: CN111997894B

Abstract

The invention provides a gear pump convenient for optimizing the opening position of an unloading groove, which comprises an upper end cover, a pump shell, a lower end cover, an upper shaft seat, a lower shaft seat, a driving gear and a driven gear, wherein the lower end surface of the upper shaft seat and the upper end surface of the lower shaft seat are both provided with a strip groove, a middle sealing block capable of moving along the length direction of the strip groove is inserted in the strip groove, and the gear pump also comprises a displacement adjusting mechanism for adjusting the moving position of the middle sealing block in the strip groove. The part for forming a dead volume with the end face of the gear is made into an independent middle sealing block, the middle sealing block divides the long strip groove into two unloading grooves which are respectively communicated with the oil suction cavity and the oil pressing cavity, and the deviation of the unloading grooves on two sides to the oil suction cavity or the oil pressing cavity is synchronously realized through the movement of the middle sealing block, so that a large number of upper shaft seat and lower shaft seat sample pieces with different unloading groove positions are omitted from being processed, the adjustment is quick and convenient, the optimal unloading groove opening position of the developed gear pump can be quickly obtained, and the performance of the gear pump is optimized.

Description

Gear pump convenient for optimizing set position of unloading groove

Technical Field

The invention relates to the technical field of gear pumps, in particular to a gear pump which is convenient for optimizing the opening position of an unloading groove.

Background

Gear pumps are rotary pumps that deliver liquid by virtue of the change in working volume and movement created between a pump cylinder and a meshing gear. The condition of ensuring the normal oil pumping of the gear pump is that the high-pressure cavity and the low-pressure cavity can not be directly communicated. For this reason, in the gear pump, it must be ensured that at any time when the gear pump is operating, more than one pair of teeth are engaged, i.e. the contact ratio >1, and that when the former pair of teeth has not been disengaged, the latter pair of teeth has already been engaged, i.e. the gear pump is operating with both pairs of teeth engaged simultaneously. The liquid remaining between the two pairs of engaging teeth is neither communicated with the low pressure chamber nor the high pressure chamber, and the enclosed space formed between the two pairs of engaging teeth is called "dead volume". During the operation of the gear pump, the dead volume is maximum when just forming, and gradually decreases along with the rotation of the gear until the two meshing points are symmetrically connected, at the moment, the volume is minimum, and the dead volume is increased when the gear pump continues to rotate. In the process that the dead volume is reduced from large to small, the trapped liquid is extruded, the pressure is increased rapidly, so that the gear and the bearing are subjected to large radial force, and the liquid is extruded from the gap forcibly; during the process that the dead volume is changed from small to big, a partial vacuum is formed, so that air mixed in the liquid is separated out to generate a cavitation phenomenon. This phenomenon causing a sharp change in oil pressure in the dead volume is called oil trapping. In the displacement hydraulic pump, a dead volume is inevitably generated in order to ensure the normal oil pumping of the hydraulic pump. In the gear pump, the change of the dead volume generates the oil trapping phenomenon. To eliminate trapping, the dead volume should be varied to ensure that the valve does not fully close. The specific structural measure is that an unloading groove (the position of the unloading groove is shown by a dotted line in the attached drawing 1) is respectively milled on two side covers of the gear pump, the unloading groove enables the dead volume which is changed in the operation process to be not closed, the dead volume is ensured to be not communicated with the oil pressing cavity and the oil suction cavity when the dead volume is minimum, the dead volume is communicated with the oil pressing cavity in the process from large to small before the dead volume reaches the minimum position, and the reduced volume is discharged to the oil pressing cavity; the dead volume is communicated with the oil suction cavity in the process of changing from small to large, and the increased volume can be supplemented by the oil suction cavity.

The specific arrangement positions of the unloading grooves are researched in the prior art, and some unloading grooves are symmetrical, and some unloading grooves are deviated to the oil suction cavity. In the actual gear pump product design, due to the difference of the product structure size, the manufacturing precision, the actual use working condition and other conditions, the position of the unloading groove has no good theoretical algorithm, and in the gear pump design and development process, the optimal position of the unloading groove needs to be obtained through a large number of experimental actual measurements, so that a large number of samples with different sizes need to be manufactured for assembly test, the material consumption is high, the workload is high, and the test time consumption is long.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a gear pump which is convenient for optimizing the opening position of an unloading groove.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: a gear pump convenient for optimizing the position of an unloading groove comprises an upper end cover, a pump shell, a lower end cover, an upper shaft base, a lower shaft base, a driving gear and a driven gear, wherein the upper end cover and the lower end cover are respectively arranged at the upper end and the lower end of the pump shell in a covering manner, the upper shaft base, the lower shaft base, the driving gear and the driven gear are arranged in the pump shell and are meshed with each other, the lower end surface of the upper shaft base is attached to the upper end surfaces of the driving gear and the driven gear, the upper end surface of the lower shaft base is attached to the lower end surfaces of the driving gear and the driven gear, the lower end surface of the upper shaft base and the upper end surface of the lower shaft base are both provided with an inwards concave strip groove, the length direction of the strip groove is vertical to the central connecting line of the driving gear and the driven gear, two side surfaces of the strip groove are provided with limiting ribs, and a middle sealing, the two side faces of the middle sealing block are provided with limiting grooves, the limiting grooves are matched with the limiting ribs, the surface of the middle sealing block is flush with the lower end face of the upper shaft seat or the upper end face of the lower shaft seat, and the middle sealing block further comprises a displacement adjusting mechanism for adjusting the moving position of the middle sealing block in the strip groove.

By adopting the technical scheme of the invention, the part for forming the dead volume with the end face of the gear is made into an independent middle sealing block, the middle sealing block divides the long-strip groove into two unloading grooves which are respectively communicated with the oil suction cavity and the oil pressing cavity, and the deviation of the unloading grooves at two sides to the oil suction cavity or the oil pressing cavity is synchronously realized by the movement of the middle sealing block, so that an upper shaft seat and a lower shaft seat sample piece with different unloading groove positions are not required to be processed, the adjustment is quick and convenient, the optimal unloading groove opening position of the developed gear pump can be quickly obtained, and the performance of the gear pump is optimized.

Furthermore, the displacement adjusting mechanism comprises a lateral cover body and two spiral fine adjusting mechanisms respectively connected with the upper middle sealing block and the lower middle sealing block, the lateral cover body is installed on an oil inlet of the pump shell, and an interface used for connecting an oil inlet pipe is arranged on the lateral cover body.

Further, the spiral fine adjustment mechanism comprises a fixed sleeve, a spiral sleeve and a screw rod, the fixed sleeve is installed on the lateral cover body, the spiral sleeve is rotatably installed on the fixed sleeve, and the screw rod is screwed in the inner thread of the thread sleeve.

By adopting the preferable scheme, the position of the middle sealing block can be conveniently and stably adjusted.

Furthermore, a rubber sealing strip is arranged on the contact surface of the middle sealing block and the long groove.

Furthermore, a plurality of rubber sealing strips which are arranged at intervals in the length direction of the long strip groove are arranged on the contact surface of the middle sealing block and the long strip groove.

Further, the rubber sealing strips are arranged in a wave shape.

By adopting the preferable scheme, the isolation effect of the high-pressure area and the low-pressure area at two sides of the middle sealing block is ensured, the oil is prevented from leaking from the oil pressing cavity to the oil suction cavity, and the accuracy of experimental testing is improved.

Furthermore, the lower end surface of the upper shaft seat and the upper end surface of the lower shaft seat are coated with Teflon layers.

Further, all surfaces of the middle sealing block are coated with the teflon layers.

Adopt above-mentioned preferred scheme, promote wear resistance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the operation of a gear pump;

FIG. 2 is a schematic structural diagram of one embodiment of the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic structural view of a lower shaft seat according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of an arrangement mode of a rubber sealing strip on the middle sealing block in the invention.

Names of corresponding parts represented by numerals and letters in the drawings:

10-upper end cap; 20-a pump housing; 30-lower end cap; 40-upper shaft seat; 50-lower shaft seat; 60-a drive gear; 70-a driven gear; 80-long grooves; 801-limiting ribs; 90-middle sealing block; 901-a limit groove; 91-displacement adjusting mechanism; 911-lateral cover; 912-fixing sleeves; 913-a helical sleeve; 914-screw rod; 92-rubber seal strip.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 2 to 4, in an embodiment of the present invention, a gear pump facilitating optimization of the position of the relief groove comprises an upper end cover 10, a pump housing 20, a lower end cover 30, an upper shaft base 40, a lower shaft base 50, a driving gear 60 and a driven gear 70, wherein the upper end cover 10 and the lower end cover 30 are respectively covered on the upper end and the lower end of the pump housing 20, the upper shaft base 40, the lower shaft base 50, the driving gear 60 and the driven gear 70 are arranged in the pump housing 20, the driving gear 60 is engaged with the driven gear 70, the lower end surface of the upper shaft base 40 is attached to the upper end surfaces of the driving gear 60 and the driven gear 70, the upper end surface of the lower shaft base 50 is attached to the lower end surfaces of the driving gear 60 and the driven gear 70, an inwardly concave strip groove 80 is arranged on both the lower end surface of the upper shaft base 40 and the upper end surface of the lower shaft base 50, the length, the both sides face in rectangular groove 80 is equipped with spacing muscle 801, rectangular groove 80 interpolation is furnished with the middle sealing piece 90 that can follow rectangular groove length direction and remove, and the both sides face of middle sealing piece 90 is equipped with spacing groove 901, and spacing groove 901 sets up with spacing muscle 801 phase-match, and the surface of middle sealing piece 90 and the lower terminal surface of last axle bed 40 or with the up end parallel and level of lower axle bed 50 still include the displacement adjustment mechanism that is used for adjusting middle sealing piece at rectangular inslot shift position.

The beneficial effect of adopting above-mentioned technical scheme is: the part for forming a dead volume with the end face of the gear is made into an independent middle sealing block, the middle sealing block divides the long strip groove into two unloading grooves which are respectively communicated with the oil suction cavity and the oil pressing cavity, and the deviation of the unloading grooves on two sides to the oil suction cavity or the oil pressing cavity is synchronously realized through the movement of the middle sealing block, so that an upper shaft seat and a lower shaft seat sample piece with different unloading groove positions are omitted from being processed, the adjustment is quick and convenient, the optimal unloading groove opening position of the developed gear pump can be quickly obtained, and the performance of the gear pump is optimized.

In another embodiment of the present invention, as shown in fig. 3, the displacement adjusting mechanism includes a lateral cover 911 and two spiral fine-adjusting mechanisms respectively connected to the upper and lower middle sealing blocks, the lateral cover 911 is installed on the oil inlet of the pump housing 20, and the lateral cover 911 is provided with an interface for connecting the oil inlet pipe. The screw fine adjustment mechanism comprises a fixed sleeve 912, a screw sleeve 913 and a screw 914, wherein the fixed sleeve 912 is installed on the lateral cover body 911, the screw sleeve 913 is rotatably installed on the fixed sleeve 912, and the screw 914 is screwed in the internal thread of the screw sleeve. The beneficial effect of adopting above-mentioned technical scheme is: the position of the middle sealing block can be conveniently and stably adjusted.

In other embodiments of the invention, as shown in fig. 5, the contact surface of the middle sealing block 90 and the elongated groove is provided with an inward groove body, and a rubber sealing strip 92 is embedded in the groove body. To further improve the sealing performance, the rubber seal strip 92 includes a plurality of rubber seal strips spaced apart in the longitudinal direction of the elongated groove, and the rubber seal strip 92 is arranged in a wave shape. The beneficial effect of adopting above-mentioned technical scheme is: the isolation effect of the high-pressure area and the low-pressure area on two sides of the middle sealing block is ensured, the oil is prevented from leaking from the oil pressing cavity to the oil suction cavity, and the accuracy of experimental testing is improved.

In other embodiments of the present invention, the lower end surface of the upper shaft housing 40 and the upper end surface of the lower shaft housing 50 are coated with a Teflon layer. All surfaces of the middle seal block 90 are coated with a teflon layer. The beneficial effect of adopting above-mentioned technical scheme is: the wear resistance is improved.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the scope of the present invention.

Claims

1. A gear pump convenient for optimizing the position of an unloading groove comprises an upper end cover, a pump shell, a lower end cover, an upper shaft base, a lower shaft base, a driving gear and a driven gear, wherein the upper end cover and the lower end cover are respectively arranged at the upper end and the lower end of the pump shell in a covering manner, the upper shaft base, the lower shaft base, the driving gear and the driven gear are arranged in the pump shell and are meshed with each other, the lower end surface of the upper shaft base is attached to the upper end surfaces of the driving gear and the driven gear, the upper end surface of the lower shaft base is attached to the lower end surfaces of the driving gear and the driven gear, the gear pump is characterized in that the lower end surface of the upper shaft base and the upper end surface of the lower shaft base are both provided with an inwards concave strip groove, the length direction of the strip groove is vertical to a central connecting line of the driving gear and, rectangular inslot interpolation is furnished with the middle piece that seals that can follow rectangular groove length direction and remove, the both sides face of middle piece that seals is equipped with the spacing groove, the spacing groove with spacing muscle phase-match sets up, the surface of middle piece that seals with go up the lower terminal surface of axle bed or with the up end parallel and level of axle bed down, still including the displacement adjustment mechanism who is used for adjusting middle piece that seals at rectangular inslot shift position.

2. The gear pump convenient for optimizing the opening position of the unloading groove according to claim 1, wherein the displacement adjusting mechanism comprises a lateral cover body and two spiral fine adjustment mechanisms respectively connected with an upper middle sealing block and a lower middle sealing block, the lateral cover body is installed on an oil inlet of the pump shell, and the lateral cover body is provided with an interface used for connecting the oil inlet pipe.

3. The gear pump facilitating optimized unloading slot opening position according to claim 2, characterized in that the screw fine adjustment mechanism comprises a fixed sleeve, a screw sleeve and a screw rod, the fixed sleeve is mounted on the lateral cover body, the screw sleeve is rotatably mounted on the fixed sleeve, and the screw rod is screwed in the inner thread of the screw sleeve.

4. The gear pump facilitating optimization of the opening position of the unloading groove according to claim 1, wherein a rubber sealing strip is arranged on a contact surface of the middle sealing block and the long groove.

5. The gear pump convenient for optimizing the position of the unloading groove according to claim 4, wherein a plurality of rubber sealing strips arranged at intervals in the length direction of the long groove are arranged on the contact surface of the middle sealing block and the long groove.

6. The gear pump facilitating optimization of the position of an unloading groove according to claim 5, wherein the rubber sealing strips are arranged in a wave shape.

7. The gear pump facilitating optimization of the position where an unloading groove is formed according to claim 1, wherein a teflon layer is coated on the lower end face of the upper shaft seat and the upper end face of the lower shaft seat.

8. A gear pump facilitating optimized relief groove opening position according to claim 7, characterized in that all surfaces of the middle seal block are coated with Teflon layer.