Novel constant-flow gear pump for excavator

Abstract

The utility model provides a novel constant flow gear pump for an excavator, which comprises a pump body provided with an oil inlet B and an oil outlet F. A driving shaft, a driving gear, a driven shaft and a driven gear are arranged in the pump body, the driving gear is meshed with the driven gear, the oil inlet B of the pump body is externally connected with an oil inlet pipe, an iron plate is arranged in the oil inlet pipe, and the driven shaft is meshed with the driven gear. Magnetic steel is arranged on the end face, deviating from the oil inlet B, of the iron disc, and a plurality of liquid passing holes are formed in the iron disc. Before hydraulic oil enters the pump body, scrap iron impurities in the hydraulic oil are adsorbed by the iron disc, scrap iron is prevented from entering the pump body to abrade the meshed surface of the driving gear and the driven gear, and the operation stability and the service life of the driving gear and the driven gear are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the pump manufacturing field, especially is involved in a new type constant flow gear pump for excavator. BACKGROUND

[0002] The constant flow gear pump is commonly used in the hydraulic transmission system of the excavator, and the constant flow gear pump is a pump that relies on two or more than two gears sealed in a shell to deliver the hydraulic oil in the oil tank to the corresponding equipment through the volume change of the working space generated in the meshing process of the gears. In order to prevent the impurities in the hydraulic oil from wearing the gear pump, a filter screen filter is usually arranged between the oil tank and the gear pump to filter the impurities in the hydraulic oil, so as to improve the cleanliness of the hydraulic oil entering the gear pump.

[0003] In order to not affect the suction capacity of the gear pump, the filter screen is selected to have a coarse filter screen structure, and the filter can only filter out the impurities with large particles in the hydraulic oil, which can solve the problem of impurities wearing the gear pump to a certain extent. The hydraulic transmission system of the equipment is a circulating system, that is, the hydraulic oil is circulated and used, and the hydraulic oil contains iron filings and slag generated during the operation of the equipment. The iron filings and slag are difficult to be filtered out by the coarse filter screen, and the iron filings will enter the gear pump with the hydraulic oil, which will still cause the gear pump to wear and affect the operation stability and service life of the gear pump. SUMMARY

[0004] Therefore, the utility model aims at providing a new type constant flow gear pump for excavator, removing the iron filings and impurities in the hydraulic oil, preventing the iron filings and impurities in the hydraulic oil from wearing the gear pump, and improving the operation stability and service life of the gear pump.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A new type constant flow gear pump for excavator, comprising a pump body provided with an oil inlet B and an oil outlet F, a driving shaft and a driving gear, a driven shaft and a driven gear are arranged in the pump body, the driving gear and the driven gear are engaged, an oil inlet pipe is connected to the oil inlet B of the pump body, an iron disc is arranged in the oil inlet pipe, magnetic steel is arranged on the end face of the iron disc away from the oil inlet B, and a plurality of liquid passing holes are formed in the iron disc.

[0007] Further, the oil inlet pipe is a stainless steel oil inlet pipe.

[0008] Further, the iron disc comprises an inner ring and an outer ring, an annular space is formed between the inner ring and the outer ring, and the inner ring and the outer ring are connected through a plurality of connecting plates arranged at equal intervals in the circumferential direction. The end face of each connecting plate away from the oil inlet B is provided with magnetic steel.

[0009] Further, the iron disc is arranged at the inlet end of the oil inlet pipe.

[0010] Further, the inner tube wall of the oil inlet pipe is provided with a convex ring, and the outer edge of the iron disc is provided with a plurality of connecting ears which are connected and fixed by screws and the convex ring.

[0011] Further, the inlet end of the oil inlet pipe is connected with a corrugated compensator through a flange, and a sealing gasket is arranged between the connecting flanges of the oil inlet pipe and the corrugated compensator.

[0012] Compared with the prior art, the novel constant-flow gear pump for excavators has the following advantages:

[0013] (1) In the utility model, the iron filings impurities in the hydraulic oil are adsorbed by the iron disc before the hydraulic oil enters the pump body, so that the iron filings are prevented from entering the pump body to wear the meshing surfaces of the driving gear and the driven gear, and the operation stability and service life of the driving gear and the driven gear are ensured.

[0014] (2) In the utility model, the iron disc is detachably installed in the oil inlet pipe, the oil inlet pipe is connected with the pipeline of the corresponding equipment through the corrugated compensator arranged by cutting, and the corrugated compensator can be removed during slag removal, so that the iron disc can be conveniently removed and the iron filings adsorbed on the iron disc can be conveniently cleaned, and the convenience of iron disc installation and removal is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings constituting a part of the utility model are used to provide further understanding of the utility model, and the schematic embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0016] Figure 1 A schematic diagram of the novel constant-flow gear pump for excavators according to the utility model embodiment is shown in the figure;

[0017] Figure 2 A Figure 1 A-A sectional view;

[0018] Figure 3 An iron disc structure schematic diagram in the embodiment;

[0019] Explanation of reference signs:

[0020] 1-pump body; 2-oil inlet pipe; 3-iron disc; 31-liquid passing hole; 32-connecting ear; 33-outer ring; 34-inner ring; 35-connecting plate; 4-sealing gasket; 5-corrugated compensator; 6-magnetic steel; 7-driving shaft; 8-driving gear; 9-driven shaft; 10-driven gear. DETAILED DESCRIPTION

[0021] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] As Figure 1 , 2As shown, a new constant flow gear pump for excavator, comprising a pump body 1 provided with an oil inlet B and an oil outlet F, a driving shaft 7 and a driving gear 8, a driven shaft 9 and a driven gear 10 are arranged in the pump body 1, the driving gear 8 and the driven gear 10 are engaged, an oil inlet pipe 2 is connected to the oil inlet B of the pump body 1, the oil inlet pipe 2 is preferably a stainless steel pipe, and an iron disc 3 is arranged in the oil inlet pipe 2.

[0023] The specific structure of the iron disc 3 is shown in Figure 3 It comprises an inner ring 34 and an outer ring 33 arranged concentrically, an annular space is formed between the inner ring 34 and the outer ring 33, and the inner ring 34 and the outer ring 33 are connected by a plurality of connecting plates 35 arranged equidistantly in the circumferential direction, the inner ring 34, the outer ring 33 and the connecting plate 35 are all iron pieces, wherein at least three connecting ears 32 are arranged on the outer edge of the outer ring 33, the connecting plate 35 is preferably a rectangular plate arranged radially along the iron disc 3, the inner ring 34 and the outer ring 33 are connected by the connecting plate 35, and a liquid passage 31 is formed between every two adjacent connecting plates 35. A magnetic steel 6 is arranged on the end face of each connecting plate 35 away from the oil inlet B, and the magnetic steel 6 is preferably a rectangular magnetic steel sheet structure corresponding to the connecting plate 35. Since the iron disc 3 is made of iron, the entire iron disc has magnetic properties under the action of the magnetic steel, so as to adsorb iron filings.

[0024] In order to facilitate the disassembly and assembly of the iron disc 3, a convex ring is arranged on the inner wall of the oil inlet pipe 2 near the inlet end, and the connecting ears 32 are connected and fixed by screws and the convex ring. At the same time, the inlet end of the oil inlet pipe 2 is connected to the corrugated compensator 5 through a flange, the corrugated compensator 5 is connected to the outlet pipeline of the filter in the hydraulic system, and a sealing gasket 4 is arranged between the connecting flanges of the oil inlet pipe 2 and the corrugated compensator 5.

[0025] During the operation of the constant flow gear pump, the hydraulic oil circulates in the hydraulic system. When the hydraulic oil is transported to the constant flow gear pump through the oil inlet pipe 2, the iron filings carried by the hydraulic oil are adsorbed by the iron disc 3, and the pure hydraulic oil after filtration enters the constant flow gear pump, effectively preventing the iron filings from wearing the gears of the gear pump. The iron disc 3 can be regularly disassembled and cleaned of iron filings, or the suction condition of the gear pump can be judged. If the suction capacity of the gear pump is found to be reduced, it can be judged that the iron disc 3 is not circulating well, and at this time the iron disc 3 can be disassembled and cleaned of the adsorbed iron filings.

[0026] The constant flow gear pump has a built-in iron filings filtering structure and a corresponding installation structure for the hydraulic system, which ensures the cleanliness of the hydraulic oil entering the pump body and prevents gear wear. At the same time, the installation structure corresponding to the hydraulic system is arranged to facilitate the removal of the iron filings adsorbed by the iron filings filtering structure, thereby improving the operation convenience and efficiency.

[0027] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A new constant flow gear pump for excavator, comprising a pump body (1) provided with an oil inlet B and an oil outlet F, a driving shaft (7) and a driving gear (8), a driven shaft (9) and a driven gear (10) are arranged in the pump body (1), the driving gear (8) and the driven gear (10) are engaged, characterized in that: The oil inlet B of the pump body (1) is externally connected with an oil inlet pipe (2), an iron disc (3) is arranged in the oil inlet pipe (2), a magnetic steel (6) is arranged on the end face of the iron disc (3) away from the oil inlet B, and a plurality of liquid passing holes (31) are formed in the iron disc (3).

2. A novel constant flow gear pump for excavators as claimed in claim 1 wherein: The oil inlet pipe (2) is a stainless steel oil inlet pipe.

3. A novel constant flow gear pump for excavator as claimed in claim 1 wherein: The iron disc (3) comprises an inner ring (34) and an outer ring (33), an annular space is formed between the inner ring (34) and the outer ring (33), and a plurality of connecting plates (35) are arranged at equal intervals in the circumferential direction and connect the inner ring (34) and the outer ring (33), and the magnetic steel (6) is arranged on the end face of each connecting plate (35) away from the oil inlet B.

4. A novel constant flow gear pump for excavator as claimed in claim 1 wherein: The iron disc (3) is arranged at the inlet end of the oil inlet pipe (2).

5. A novel constant flow gear pump for excavators as claimed in claim 4 wherein: A convex ring is arranged on the inner wall of the oil inlet pipe (2), a plurality of connecting lugs (32) are arranged on the outer edge of the iron disc (3), and the connecting lugs (32) are fixedly connected with the convex ring through screws.

6. A novel constant flow gear pump for excavators as claimed in claim 1, wherein: The inlet end of the oil inlet pipe (2) is connected with a corrugated compensator (5) through a flange, and a sealing gasket (4) is arranged between the connected flanges of the oil inlet pipe (2) and the corrugated compensator (5).

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