CN214007497U

CN214007497U - Two-stage booster gear pump

Info

Publication number: CN214007497U
Application number: CN202023282314.5U
Authority: CN
Inventors: 杨杰
Original assignee: Jiangsu Vocational College of Electronics and Information
Current assignee: Jiangsu Vocational College of Electronics and Information
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-08-20
Anticipated expiration: 2030-12-30

Abstract

The utility model discloses a two-stage booster gear pump, including transmission shaft gear I, the pump body, there are two waist shape holes inside the pump body, two waist shape holes include the front hole, the back hole, install the back pump driving gear in the back hole, back pump driven gear, back pump shaft sleeve assembly, install the front pump driving gear in the front hole, front pump driven gear, front pump shaft sleeve assembly, have on the pump body with the oil inlet a of front pump suction chamber intercommunication, with the d hole that is used for producing oil of front pump suction chamber intercommunication and with the h hole of back pump suction chamber intercommunication fuel feeding extrusion, the oil absorption chamber of d hole intercommunication back pump. Two gear pumps share a pump body around, and preceding pump oil inlet intercommunication oil tank, the oil-out communicates with each other with the oil inlet of rear pump, and this design makes the rear pump oil inlet be high-pressure oil, under the roughly the same circumstances of pressure differential with preceding pump business turn over hydraulic fluid port, can be so that rear pump hydraulic fluid port pressure is higher to satisfy some high-pressure system's requirement.

Description

Two-stage booster gear pump

Technical Field

The utility model relates to a gear pump, concretely relates to two-stage booster gear pump.

Background

The gear pump has the advantages of simple structure, low cost, insensitivity to oil pollution, convenient processing and the like, and is widely applied to hydraulic systems of agricultural machinery and the like. However, the gear pump has the defect of unbalanced radial hydraulic pressure, the larger the pressure difference of the oil inlet and the oil outlet of the gear pump is, the larger the radial hydraulic unbalanced force is, so the pressure difference of the oil inlet and the oil outlet of the gear pump cannot be too large; the inlet of the gear pump is generally connected with an oil tank, and the pressure of the inlet is basically unchanged, so that the outlet pressure, namely the working pressure, of the gear pump cannot be too high, and the requirements of some high-pressure systems cannot be met.

Disclosure of Invention

The utility model discloses not enough to prior art provides a two-stage booster gear pump, under the basically unchangeable condition of guaranteeing gear pump processing technology performance, a pump body of two gear pumps sharing around, the front pump is the same with ordinary gear pump, the oil tank is led to the front pump oil inlet, the oil inlet of front pump oil outlet and back pump communicates with each other, this design makes the back pump oil inlet be the high-pressure oil, under the roughly the same circumstances with front pump business turn over hydraulic fluid port pressure differential, make back pump oil outlet pressure higher, thereby satisfy some high-pressure system's requirement.

In order to achieve the above object, the utility model provides a following technical scheme: a two-stage booster gear pump comprises a transmission shaft gear I and a pump body, wherein two waist-shaped inner holes are formed in the pump body, the two waist-shaped inner holes comprise a front hole and a rear hole, a rear pump driving gear, a rear pump driven gear and a rear pump shaft sleeve assembly are arranged in the rear hole, the rear pump driving gear is meshed with the rear pump driven gear, a front pump driving gear, a front pump driven gear and a front pump shaft sleeve assembly are arranged in the front hole, the front pump driving gear is meshed with the front pump driven gear, the transmission shaft gear I is meshed with a transmission shaft gear II and a transmission shaft gear III, a gear shaft of the transmission shaft gear II is connected with a gear shaft of the rear pump driving gear through a cross-shaped slider joint, a gear shaft of the transmission shaft gear III is connected with a gear shaft of the pump II driving gear through a cross-shaped slider joint, an oil inlet a communicated with a front pump pumping oil cavity, a d hole communicated with the front pumping oil cavity and an h hole communicated with the rear pumping oil cavity for oil supply and oil supply extrusion, the hole d is communicated with an oil suction cavity of the rear pump.

On the basis of the above scheme, as preferred, the front end fixed mounting of the pump body has the protecgulum, and the protecgulum includes protecgulum and lower protecgulum, goes up protecgulum and passes through bolt fixed connection with lower protecgulum.

In addition to the above-mentioned scheme, preferably, a sealing piece II is installed on the joint surface of the upper front cover and the lower front cover.

On the basis of the scheme, preferably, the shaft extending positions of the upper front cover and the transmission shaft gear I are sealed through framework oil seals.

On the basis of the scheme, preferably, a transmission shaft gear is arranged in an inner cavity formed by the upper front cover and the lower front cover, rolling ball bearings are arranged on journals at two ends of each transmission shaft gear, and each transmission shaft gear comprises a transmission shaft gear I, a transmission shaft gear II and a transmission shaft gear III.

On the basis of the scheme, the pump further comprises a rear cover, the rear cover is fixedly connected with the pump body through bolts, and a sealing piece I is arranged between the pump body and the rear cover.

On the basis of the scheme, the pump body is preferably provided with a small hole e, the small hole e is communicated with a hole d, the hole e is communicated with a hole j on the rear cover, the hole j is communicated with the hole k, and a safety valve is arranged in the hole k.

On the basis of the scheme, as preferred, including big diameter section, little diameter section on the k hole, the lower extreme of the safety valve core of relief valve is pressed there is the relief valve spring to support the safety valve core the junction shutoff at big diameter section and little diameter section, the spring force pressure regulating valve rod of relief valve spring passes through set nut and fixes on the back lid, sealed pad is installed at both ends about the set nut to lock with the valve gap nut, still include hole m, hole m one end intercommunication big diameter section, hole b on the other end intercommunication pump body, hole b is linked together with the inlet port an of preceding pump.

On the basis of the scheme, preferably, two end journals of the front pump driving gear and the front pump driven gear are arranged in two inner holes of the front pump shaft sleeve assembly, and the front pump shaft sleeve assembly is provided with a groove c for communicating a front pump pumping oil cavity with the two inner holes of the front pump bearing assembly.

On the basis of the scheme, preferably, two end journals of the rear pump driving gear and the rear pump driven gear are arranged in two inner holes of the rear pump shaft sleeve assembly, and the two inner holes of the rear pump shaft sleeve assembly are communicated with a front pump pumping oil cavity.

Compared with the prior art, the beneficial effects of the utility model are that:

two gear pumps share a pump body around, and the front pump is the same with ordinary gear pump, and the oil tank is led to the front pump oil inlet, and the front pump oil outlet communicates with each other with the oil inlet of rear pump, and this design makes the rear pump oil inlet be high-pressure oil, under the roughly the same circumstances of front pump oil inlet outlet pressure differential for rear pump oil outlet pressure is higher, thereby satisfies some high-pressure system's requirement.

Drawings

Fig. 1 is a schematic structural diagram of the present invention, and is a sectional view of fig. 2 at a position a-a.

Fig. 2 is a cross-sectional view of fig. 1 at position B-B.

Fig. 3 is a cross-sectional view of the rear cover at the position of fig. 2F-F.

The reference numbers indicate that 1-transmission shaft gear I, 2-transmission shaft gear II, 3-front cover, 31-upper front cover, 32-lower front cover, 4-pump body, 5-rear cover, 6-rear pump driving gear, 7-rear pump shaft sleeve assembly, 8-front pump driving gear, 9-front pump shaft sleeve assembly, 10-sealing piece I, 11-cross slide block joint, 12-sealing piece II, 13-transmission shaft gear III, 14-framework oil seal, 15-rear pump driven gear, 16-front pump driven gear, 17-safety valve core, 18-safety valve spring, 19-pressure regulating valve rod, 20-positioning nut, 3-front cover, 31-upper front cover, 32-lower front cover, 4-pump body, 5-rear cover, 6-rear pump driving gear, 7-rear pump, 21-sealing gasket, 22-valve cap nut.

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 work belong to the protection scope of the present invention.

As shown in fig. 1 to 3, the utility model discloses by transmission gear I1, protecgulum 3, the pump body 4, back lid 5, back pump driving gear 6, back pump shaft cover assembly 7, front pump driving gear 8, preceding pump shaft cover assembly 9, crosshead shoe joint 11, back pump driven gear 15, parts such as front pump driven gear 16 constitute. The front cover 3 is composed of an upper front cover 31 and a lower front cover 32 which are connected together through bolts, the joint surfaces of the upper front cover and the lower front cover are sealed by a sealing piece II 12, and the shaft extending positions of the upper front cover and the transmission shaft gear I are sealed by a framework oil seal 14. The transmission shaft gears are arranged in an inner cavity formed by the upper front cover and the lower front cover, and rolling ball bearings are arranged on journals at two ends of each transmission shaft gear; two kidney-shaped inner holes are formed in the pump body 4, a rear pump driving gear, a rear pump driven gear and a rear pump shaft sleeve assembly are arranged in the rear hole, a front pump driving gear, a front pump driven gear and a front pump shaft sleeve assembly are arranged in the front hole, the rear cover, the pump body and the front cover are connected together through bolts, and in order to prevent oil leakage, sealing pieces I10 are arranged between the pump body and the front cover and between the pump body and the rear cover.

The motor drives the transmission shaft gear I to rotate, and the transmission shaft gear I simultaneously drives the transmission shaft gear II and the transmission shaft gear III to rotate in the same direction; as shown in the figure, the transmission shaft gear I rotates leftwards to drive the transmission shaft gear II and the transmission shaft gear III to rotate rightwards. The transmission shaft gear II drives the rear pump driving gear 6 to rotate rightwards through the crosshead shoe joint 11, and the transmission shaft gear III 13 drives the front pump driving gear 8 to rotate rightwards through the crosshead shoe joint 11.

The oil inlet of the front pump is communicated with the oil tank, and the pressure is represented by P1; the front pump driving gear drives the front pump driven gear to rotate left in the right direction, hydraulic oil is sucked in from an oil inlet a of the front pump and pressed out from a hole d through meshing transmission of the two gears, and oil outlet pressure is represented by P2. The hole d is an oil inlet hole of the rear pump and leads to an oil suction cavity of the rear pump, and the front pump pressurizes and supplies oil to the rear pump, so that oil is fed into an oil inlet of the rear pump as high-pressure oil. The rear pump driving gear drives the rear pump driven gear to rotate left in the right direction, hydraulic oil is sucked from an oil inlet d of the rear pump through meshing transmission of the two gears and then is extruded from an oil pressing port h, and the pressure is represented by P3. The pressure difference of the front pump oil inlet and outlet is P2-P1, the pressure difference of the rear pump oil inlet and outlet is P3-P2, and the rear pump can output higher pressure under the condition that the pressure difference of the rear pump oil inlet and outlet is approximately the same as that of the front pump oil inlet and outlet, so that the requirement of a high-pressure system is met.

A small hole e is processed on the pump body and communicated with a hole d of an oil outlet of the front pump, the hole e is communicated with a hole j on the rear cover, and the hole j is communicated with a hole k; a safety valve is installed in the pump, pressure oil P2 of an oil outlet of the front pump flows to a small hole e through a hole d and then flows to a rear cover through a hole e to cover a hole j, then flows to a hole k through the hole j to act on the upper end of a safety valve core 17, a safety valve spring 18 is pressed at the lower end of the safety valve core 17, the spring force of the safety valve spring 18 is adjusted by a pressure adjusting valve rod 19, a positioning nut 20 fixes the position after adjustment, a sealing gasket 21 is installed at the upper end and the lower end of the positioning nut to prevent external oil leakage, and the sealing gasket is locked by a valve cover nut. Different spring forces correspond to different set pressures of the safety valve, when the pressure oil P2 at the oil outlet is smaller than the set pressure of the safety valve, the hydraulic pressure acting on the upper end of the safety valve core 17 is smaller than the spring force, the overflow hole k is closed, and the k port does not overflow; when the load becomes larger and the outlet pressure oil P2 is larger than the set pressure of the safety valve, the hydraulic pressure acting on the upper end of the safety valve core 17 is larger than the spring force, the safety valve core 17 is jacked open, the overflow hole k is opened for overflow, so that the outlet pressure oil P2 is reduced to the set pressure of the safety valve and is kept basically unchanged. The overflow hole k opens the oil liquid which overflows and flows to the upper hole b of the pump body through the hole m and then is communicated with the oil inlet hole a of the front pump.

The set pressure of the safety valve is about half of the highest pressure of the hydraulic system, namely half of P3, so that the maximum working pressure of the front pump is half of the maximum working pressure of the whole two-stage booster gear pump, the loads borne by the front pump and the rear pump are basically the same, and the maximum performance of the two pumps is exerted.

The structure of the front pump is the same as that of a common gear pump, two end journals of a driving gear and a driven gear of the front pump are arranged in two inner holes of a front pump shaft sleeve assembly 9, a sealing piece is arranged on the front pump shaft sleeve assembly to separate low-pressure oil and high-pressure oil from an oil inlet and an oil outlet, the low-pressure oil at the oil inlet is communicated with the two inner holes of the front pump shaft sleeve assembly 9 through an upper groove c of the front pump shaft sleeve assembly 9, and the two end journals of the driving gear and the driven gear of the front pump are lubricated.

The structure of the rear pump is different from that of a common gear pump, two end journals of a driving gear and a driven gear of the rear pump are arranged in two inner holes of a rear pump shaft sleeve assembly 7, high-pressure oil is communicated with an oil inlet of the rear pump, and a sealing element is arranged on the rear pump shaft sleeve assembly to separate oil from an oil inlet and an oil outlet; the oil inlet and the oil outlet are separated from two inner holes of the rear pump shaft sleeve assembly 7, so that lubricating oil for lubricating two end journals of a driving gear and a driven gear of the rear pump cannot be introduced from an oil inlet of the rear pump but needs to be introduced from an oil inlet of the front pump; low-pressure oil at an oil inlet of the front pump enters an inner cavity of the front cover through a plurality of internal channels, enters an inner hole of a rear pump shaft sleeve assembly at the left end of the rear pump shown in the figure 1 from the joint of a driving gear of the rear pump and the crosshead shoe, and is introduced into an inner hole at the right side shown in the figure 2 of the rear pump shaft sleeve assembly at the right end of the rear pump shown in the figure 1 through a hole g on a driven gear of the rear pump to lubricate a journal at the right end of the driven gear of the rear pump; and lubricating oil is introduced into an inner hole provided with a driving gear shaft neck of the right-end rear pump shaft sleeve assembly through a groove f on the rear pump shaft sleeve assembly to lubricate the right-end shaft neck of the driving gear of the rear pump.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A two-stage booster gear pump is characterized by comprising a transmission shaft gear I (1) and a pump body (4), wherein two waist-shaped inner holes are formed in the pump body (4), the two waist-shaped inner holes comprise a front hole and a rear hole, a rear pump driving gear (6), a rear pump driven gear (15) and a rear pump shaft sleeve assembly (7) are arranged in the rear hole, the rear pump driving gear is meshed with the rear pump driven gear, a front pump driving gear (8), a front pump driven gear (16) and a front pump shaft sleeve assembly (9) are arranged in the front hole, the front pump driving gear is meshed with the front pump driven gear, the transmission shaft gear I (1) is meshed with a transmission shaft gear II (2) and a transmission shaft gear III (13), a gear shaft of the transmission shaft gear II is connected with a gear shaft of the rear pump driving gear through a cross slide block joint, a gear shaft of the transmission shaft gear III is connected with a gear shaft of the pump driving gear II through a cross slide block joint (11), the pump body is provided with an oil inlet a communicated with the front pump pumping oil cavity, a hole d communicated with the front pump pumping oil cavity and used for oil outlet, and a hole h communicated with the rear pump pumping oil cavity and used for oil supply and extrusion, and the hole d is communicated with the oil suction cavity of the rear pump.

2. A two-stage booster gear pump according to claim 1, characterised in that the front end of the pump body (4) is fixedly fitted with a front cover (3), the front cover (3) comprising an upper front cover (31) and a lower front cover (32), the upper front cover and the lower front cover being fixedly connected by means of bolts.

3. A two-stage booster gear pump according to claim 2, characterised in that a seal ii (12) is mounted at the junction surface of the upper and lower front covers.

4. A two-stage booster gear pump according to claim 2, characterised in that the shaft extensions of the upper front cover and the drive shaft gear i are sealed by a skeleton oil seal (14).

5. The two-stage booster gear pump of claim 2, wherein the inner cavity formed by the upper and lower front covers has drive shaft gears mounted therein, and ball bearings are mounted on journals at both ends of each drive shaft gear, and the drive shaft gears include a drive shaft gear i (1), a drive shaft gear ii, and a drive shaft gear iii.

6. A two-stage booster gear pump according to claim 1, further comprising a rear cover (5) which is fixedly connected to the pump body by bolts, and a seal i (10) is installed between the pump body and the rear cover.

7. The two-stage booster gear pump of claim 1, wherein the pump body has a small bore e communicating with a bore d, the bore e communicating with a bore j on the rear cover, the bore j communicating with a bore k, and a relief valve mounted in the bore k.

8. The two-stage booster gear pump according to claim 7, wherein the k-hole includes a large diameter section and a small diameter section, a safety valve spring (18) is pressed at the lower end of a safety valve core (17) of the safety valve to abut against the joint of the large diameter section and the small diameter section to block the small diameter section, a spring force pressure regulating valve rod (19) of the safety valve spring is fixed on the rear cover through a positioning nut (20), sealing gaskets (21) are installed at the upper end and the lower end of the positioning nut and are locked by a valve cap nut (22), the two-stage booster gear pump further includes a hole m, one end of the hole m is communicated with the large diameter section, the other end of the hole m is communicated with a hole b on the pump body, and the hole b is communicated with an oil inlet hole a of the front pump.

9. The two-stage booster gear pump of claim 1, wherein the front pump drive gear and the front pump driven gear are journaled at opposite ends in two bores of a front pump sleeve assembly, the front pump sleeve assembly having a channel c communicating the front pump pumping chamber with the two bores of the front pump sleeve assembly.

10. The two-stage booster gear pump of claim 1, wherein the rear pump drive gear and the rear pump driven gear are journaled at opposite ends in two bores in the rear pump shaft sleeve assembly, the two bores in the rear pump shaft sleeve assembly being in communication with the front pump pumping chamber.