CN217129779U

CN217129779U - High-efficiency gear pump

Info

Publication number: CN217129779U
Application number: CN202122023592.7U
Authority: CN
Inventors: 章锐彪; 张乐园; 李志忠
Original assignee: Hangzhou Advance Gearbox Group Co Ltd
Current assignee: Hangzhou Advance Gearbox Group Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-08-05
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a high-efficiency gear pump, which comprises a shell, an input shaft, an output shaft, a driving gear, a driven gear, two end covers and two shaft sleeves, wherein the front end cover and the rear end cover are respectively and fixedly arranged at the front end and the rear end of the shell to form a closed box body; the input shaft and the output shaft are arranged on the box body, the driving gear is fixedly arranged on the input shaft and is positioned in the box body, the driven gear is fixedly arranged on the output shaft and is positioned in the box body, the driving gear and the driven gear are in meshing transmission, the two shaft sleeves are respectively positioned on the front half section and the rear half section of the shell, a plurality of combined seals are arranged on the inner end surfaces of the shaft sleeves, the plurality of combined seals on the shaft sleeve positioned on the front half section of the shell are attached to the front end surfaces of the driving gear and the driven gear, and the plurality of combined seals on the shaft sleeve positioned on the rear half section of the shell are attached to the rear end surfaces of the driving gear and the driven gear; this technical scheme can reduce the interior hydraulic oil leakage quantity of gear pump.

Description

High-efficiency gear pump

Technical Field

The utility model relates to a hydraulic means technical field especially relates to a high-efficient gear pump.

Background

The existing gear pump is composed of a pair of gear shafts, an oil pump shell, a front cover plate and a rear cover plate to form two closed spaces.

When the gear pair rotates, the volume of the gear disengagement side is increased, hydraulic oil is sucked, the volume of the gear entering the engagement side is decreased, and therefore the hydraulic oil is discharged into a pipeline. The oil inlet cavity and the oil outlet cavity are mutually isolated by the meshing line of the gear pair. The hydraulic oil at the oil outlet of the gear pump is used for driving other loads, so that the oil outlet is a high-pressure cavity, and the oil inlet is a low-pressure cavity.

However, due to manufacturing errors and surface unevenness of parts, a gap always exists between the gear pair and the shaft sleeve, a gap also exists between the gear pair and the oil pump shell, and a gap also exists between the gear pair, so that hydraulic oil in the high-pressure cavity (oil outlet) always leaks back to the low-pressure cavity (oil inlet) through the small gap, the theoretical displacement is always larger than the actual displacement, and the efficiency of the gear pump is not high.

Through relevant experimental statistics, about 70% of leakage amount comes from the clearance between the gear pair and the shaft sleeve; therefore, by a certain technical means, the gap leakage is reduced, the actual discharge capacity of the oil pump is improved, the efficiency of the oil pump is improved, and the urgent need is met; this is also in order to meet the current important policies and trends of energy conservation and emission reduction.

Disclosure of Invention

In order to solve the problem, the utility model aims to overcome the not enough of prior art, provide a can reduce the high-efficient gear pump of hydraulic oil leakage quantity.

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

a high-efficiency gear pump comprises a shell, an input shaft, an output shaft, a driving gear, a driven gear and a front end cover and a rear end cover, wherein the front end cover and the rear end cover are respectively and fixedly arranged at the front end and the rear end of the shell to form a closed box body; the input shaft and the output shaft are arranged on the box body, the driving gear is fixedly arranged on the input shaft and is positioned in the box body, the driven gear is fixedly arranged on the output shaft and is positioned in the box body, the driving gear and the driven gear are in meshing transmission,

still be equipped with two axle sleeves of slidable mounting in the casing, two axle sleeves are located the first half and the latter half of casing respectively, be equipped with a plurality of combination seal on the interior terminal surface of axle sleeve, be located the laminating of the preceding terminal surface of a plurality of combination seal and driving gear and driven gear on the axle sleeve of the first half of casing, be located the laminating of the rear end face of a plurality of combination seal and driving gear and driven gear on the axle sleeve of the latter half of casing.

Preferably, the inner end surface of the shaft sleeve is provided with a plurality of mounting grooves, and the plurality of combined seals are respectively mounted in the mounting grooves and protrude out of the inner end surface of the shaft sleeve.

Preferably, the plurality of combined seals are respectively positioned between the input shaft and the housing, between the input shaft and the output shaft, and between the output shaft and the housing.

Preferably, the combined seal is formed by bonding an O-shaped strip made of rubber and a polytetrafluoroethylene square strip.

Preferably, an annular groove is formed in the side wall of the shaft sleeve, and a first sealing ring is installed in the annular groove.

Preferably, the outer end face of the shaft sleeve is provided with a plurality of threaded holes.

Preferably, four sliding bearings are provided, the input shaft being mounted on the front and rear two sleeves via two of the sliding bearings, and the output shaft being mounted on the front and rear two sleeves via the other two sliding bearings.

Preferably, a second sealing ring is further provided, which is located between the input shaft and the end cap located in front.

Preferably, the shell is in a symmetrical structure in a shape like a Chinese character 'hui'.

The utility model has the advantages that: hydraulic oil in the high-pressure cavity can be prevented from leaking back to the low-pressure cavity through end face gaps of the driving gear and the driven gear; thereby improving the actual displacement of the oil pump and improving the efficiency of the oil pump.

Drawings

Fig. 1 is a schematic view of the oil distributor of the present invention;

fig. 2 is a schematic view of the present invention in the direction of a-a in fig. 1.

Description of reference numerals: 10. a housing; 11. an input shaft; 12. an output shaft; 13. a driving gear; 14. a driven gear; 15. an end cap; 16. combining and sealing; 17. an oil inlet; 18. an oil outlet; 19. a shaft sleeve; 20. a first seal ring; 190. a threaded hole; 21. and a second seal ring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The first embodiment is as follows:

as shown in fig. 1 and 2, the high-efficiency gear pump includes a housing 10, an input shaft 11, an output shaft 12, a driving gear 13, a driven gear 14, and front and rear end caps 15, wherein the front and rear end caps 15 are respectively fixedly mounted at front and rear ends of the housing 10 to form a closed box; the input shaft 11 and the output shaft 12 are installed on a box body, the driving gear 13 is fixedly installed on the input shaft 11 and located in the box body, the driven gear 14 is fixedly installed on the output shaft 12 and located in the box body, and the driving gear 13 and the driven gear 14 are in meshing transmission; wherein, still be equipped with two axle sleeves 19 of slidable mounting in casing 10, two axle sleeves 19 are located the first half and the latter half of casing 10 respectively, be equipped with a plurality of combination seal 16 on the interior terminal surface of axle sleeve 19, be located the laminating of the preceding terminal surface of a plurality of combination seal 16 and driving gear 13 and driven gear 14 on the axle sleeve 19 of the first half of casing 10, be located the laminating of the rear end surface of a plurality of combination seal 16 and driving gear 13 and driven gear 14 on the axle sleeve 19 of the latter half of casing 10.

In the embodiment of the present invention, two opposite side surfaces of the housing 10 are respectively provided with an oil inlet 17 and an oil outlet 18, and the oil inlet 17 and the spaces between the two shaft sleeves 19, the driving gear 13 and the driven gear 14 form a low pressure cavity; the oil outlet 18 and the spaces among the two shaft sleeves 19, the driving gear 13 and the driven gear 14 form a high-pressure cavity; therefore, as the plurality of first combined seals 16 are attached to the front end faces of the driving gear 13 and the driven gear 14, and the plurality of second combined seals 16 are attached to the rear end faces of the driving gear 13 and the driven gear 14, hydraulic oil in the high-pressure cavity can be prevented from leaking back to the low-pressure cavity through end face gaps of the driving gear 13 and the driven gear 14; thereby improving the actual displacement of the oil pump and improving the efficiency of the oil pump.

It should be noted here that the driving gear 13 and the driven gear 14 are identical in size and are a pair of gear pairs having the same parameters.

In the embodiment of the present invention, a plurality of mounting grooves are formed on the inner end surface of the shaft sleeve 19, and the plurality of combined seals 16 are respectively mounted in the plurality of mounting grooves and protrude from the inner end surface of the shaft sleeve 19.

Further preferably, the plurality of combined seals 16 are respectively located between the input shaft 11 and the housing 10, between the input shaft 11 and the output shaft 12, and between the output shaft 12 and the housing 10.

More preferably, the combined seal 16 is formed by bonding an O-shaped strip made of rubber and a polytetrafluoroethylene square strip; like this, when the combined seal 16 was installed in the mounting groove, the O type strip through extrusion rubber produced elastic deformation to elasticity through the O type strip makes the square strip of polytetrafluoroethylene laminating in the side of driving gear 13 and driven gear 14, in order to hinder hydraulic oil from high-pressure chamber to low pressure chamber leakage, has reduced the leakage of hydraulic oil, has improved the actual discharge capacity of oil pump, and then has improved the efficiency that the gear pump carried hydraulic oil.

In the embodiment of the present invention, an annular groove is formed on the side wall of the shaft sleeve 19, and a first sealing ring 20 is installed in the annular groove; therefore, hydraulic oil can be prevented from leaking from the high-pressure cavity through the gap between the contact surfaces of the shaft sleeve 19 and the shell 10, the leakage amount of the hydraulic oil is reduced, the actual discharge capacity of the oil pump is improved, and the efficiency of conveying the hydraulic oil by the gear pump is improved.

In the embodiment of the present invention, the outer end surface of the shaft sleeve 19 is provided with a plurality of threaded holes 190. When the parts inside the high-efficiency gear pump need to be replaced or repaired, the screw holes 190 are provided with bolts, and the sleeve 19 can be slowly pulled out of the housing 10 by the bolts.

In the embodiment of the invention, four sliding bearings are further provided, the input shaft 11 is mounted on the front and rear bushings 19 through two of the sliding bearings, and the output shaft 12 is mounted on the front and rear bushings 19 through the other two sliding bearings; specifically, the shaft sleeve 19 is heated to a certain temperature range, and then four sliding bearings are respectively installed in inner holes of two identical shaft sleeves 19, so that the sliding bearings and the shaft sleeve 19 have certain interference, and are matched with the shaft sleeve 19 to form an assembly;

the inner hole of the shaft sleeve 19 for installing the sliding bearing is reserved with a machining allowance of about 0.5mm, when the shaft sleeve 19 is cooled to normal temperature, the two components are arranged in the inner hole of the oil pump shell 10, the shaft sleeve 19 component and the oil pump shell 10 are clamped tightly through a clamp, and then the inner hole of the sliding bearing is machined to the designed size; therefore, the coaxiality of the inner holes of the front and rear sliding bearings and the parallelism of the center lines of the inner holes of the upper and lower sliding bearings are ensured in the aspect of processing technology, and the run-out of the input shaft 11 and the output shaft 12 in the operation process is further reduced.

In the embodiment of the present invention, a second seal ring 21 is further provided, the second seal ring 21 is located between the input shaft 11 and the end cover 15 located in front, and the second seal ring 21 is a lip-shaped seal ring; with this arrangement, the leakage of the hydraulic oil from the gap between the input shaft 11 and the end cover 15 located in front can be prevented, and the external environment can be prevented from being polluted.

In the embodiment of the present invention, the two end faces of the end cover 15 located at the front are provided with semi-open grooves, and are connected to the driving device through bolts or screws, and the outer side of the front cover plate is provided with a male spigot and a female spigot for accurate radial positioning of the oil pump. The user can select the 'male spigot' or the 'female spigot' to position according to the requirement.

In the embodiment of the present invention, the housing 10 has a symmetric structure.

In the embodiment of the invention, the specific installation process of the high-efficiency gear pump is as follows:

the combined seal 16 is coated with a small amount of butter in advance and then placed into the two shaft sleeves 19; and the first sealing ring 20 is also sleeved in the annular grooves of the two shaft sleeves 19;

then, the right shaft sleeve 19 is laid flat, and the end face of the side provided with the combined seal 16 faces upwards; the input shaft 11 and the output shaft 12 are sleeved into the inner hole of the sliding bearing of the shaft sleeve 19 respectively;

then, the shell 10 is slowly sleeved outside the gear pair and the shaft sleeve 19 from top to bottom;

then, the assembly is turned over by 90 °, and one end cap 15 is connected to the right end face of the housing 10 and fastened with a socket head cap screw;

then, firstly sleeving the left component on the input shaft 11, and slowly moving towards the inner hole of the oil pump shell 10 to be gradually sleeved on the output shaft 12;

finally, the other end cover 15 is attached to the left end face of the oil pump housing 10 and fastened with a hexagon socket head screw.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency gear pump comprises a shell (10), an input shaft (11), an output shaft (12), a driving gear (13), a driven gear (14) and a front end cover and a rear end cover (15), wherein the front end cover and the rear end cover (15) are fixedly arranged at the front end and the rear end of the shell (10) respectively to form a closed box body; the input shaft (11) and the output shaft (12) are arranged on the box body, the driving gear (13) is fixedly arranged on the input shaft (11) and is positioned in the box body, the driven gear (14) is fixedly arranged on the output shaft (12) and is positioned in the box body, and the driving gear (13) and the driven gear (14) are in meshing transmission;

still be equipped with two axle sleeves (19) of slidable mounting in casing (10), two axle sleeves (19) are located the first half section and the second half section of casing (10) respectively, be equipped with a plurality of combination seal (16) on the interior terminal surface of axle sleeve (19), a plurality of combination seal (16) that are located on axle sleeve (19) of the first half section of casing (10) and the preceding terminal surface laminating of driving gear (13) and driven gear (14), a plurality of combination seal (16) that are located on axle sleeve (19) of the second half section of casing (10) and the rear end surface laminating of driving gear (13) and driven gear (14).

2. A high-efficiency gear pump according to claim 1, characterized in that the inner end surface of the shaft sleeve (19) is provided with a plurality of mounting grooves, and the plurality of combined seals (16) are respectively mounted in the plurality of mounting grooves and protrude from the inner end surface of the shaft sleeve (19).

3. A high-efficiency gear pump according to claim 1, characterized in that said several combined seals (16) are located between the input shaft (11) and the housing (10), between the input shaft (11) and the output shaft (12) and between the output shaft (12) and the housing (10), respectively.

4. A high-efficiency gear pump according to claim 1, characterized in that the combined seal (16) is made by bonding of rubber O-bars with teflon square bars.

5. A high-efficiency gear pump according to claim 1, characterized in that the side wall of the bushing (19) is provided with an annular groove, and the first sealing ring (20) is mounted in the annular groove.

6. A high-efficiency gear pump according to claim 1, characterized in that the external end face of the bushing (19) is provided with threaded holes (190).

7. A high-efficiency gear pump according to claim 1, characterized in that four plain bearings are provided, the input shaft (11) being mounted on two bushings (19) in front and rear by two of the plain bearings, and the output shaft (12) being mounted on two bushings (19) in front and rear by two of the other plain bearings.

8. A high-efficiency gear pump according to claim 1, characterized in that a second sealing ring (21) is provided, said second sealing ring (21) being located between the input shaft (11) and the forward end cap (15).

9. A high-efficiency gear pump according to claim 8, characterized in that the housing (10) is of a symmetrical "return" configuration.