1. A pair of small gears (4), a pair of large gears (3), a pair of isolation plates (5) and a pair of crescent cover plates (2) which are symmetrically arranged according to a radial plane Z are arranged in the pump shell (1).

2. A pair of small gears (4) are arranged on a pump shaft (7) to drive a pair of corresponding large gears (3) to rotate.

3. The pinion (4) and the bull gear (3) on the same side are separated by a separation plate (5) fixed on the crescent cover plate (2) on the same side.

4. A pair of large gears (3) are installed by a bearing (15) and positioned in the pump shell (1) in the radial direction and connected by an inner hexagon bolt (14).

5. When the inlet cavities (1A) and (1C) of the pump shell (1) are communicated, and the outlet cavities (1B) and (1D) are communicated, double-suction parallel operation can be realized; when the inlet cavities (1A) and (1C) of the pump shell (1) are not communicated and the outlet cavities (1C) and (1B) are communicated, single-suction series operation can be realized.

Background

The inner engaged gear is used for conveying Newtonian liquid or non-Newtonian liquid in the industries of petroleum, chemical industry, coating, dye, food, grease, medicine and the like, and the types of the conveyed liquid can be from light and volatile liquid to heavy and viscous or even semi-solid liquid, so that the inner engaged gear is widely applied. Compared with a screw pump, the internal gear pump has the characteristics of high volume utilization rate, simple processing, strong bearing capacity, small space and the like.

At present, the internal gear pump has the defects of high flow and high pressure and the like due to poor cavitation of the internal gear pump in the large flow and high pressure occasions and the defects of quick abrasion, short service life and the like caused by unbalanced axial force, and the field is occupied by a screw pump with high price.

Disclosure of Invention

The embodiment of the invention aims to provide an internal gear pump with high flow rate, high pressure, long service life and low cavitation, and aims to solve the technical problems in the prior art determined in the background art.

The embodiment of the present invention is realized as follows, and an internal gear pump includes:

a pair of small gears (4), a pair of large gears (3), a pair of isolation plates (5) and a pair of crescent cover plates (2) which are symmetrically arranged according to a radial plane Z are arranged in the pump shell (1).

A pair of small gears (4) are arranged on a pump shaft (7) to drive a pair of corresponding large gears (3) to rotate.

The pinion (4) and the bull gear (3) on the same side are separated by a separation plate (5) fixed on the crescent cover plate (2) on the same side.

A pair of large gears (3) are installed by a bearing (15) and positioned in the pump shell (1) in the radial direction and connected by an inner hexagon bolt (14).

When the inlet cavities (1A) and (1C) of the pump shell (1) are communicated, and the outlet cavities (1B) and (1D) are communicated, double-suction parallel operation can be realized; when the inlet cavities (1A) and (1C) of the pump shell (1) are not communicated and the outlet cavities (1C) and (1B) are communicated, single-suction series operation can be realized.

Compared with the prior art, the invention has the beneficial effects that: the flow passage components (the large gear (3), the small gear (4), the isolating plate (5) and the crescent cover plate (2)) are symmetrically arranged and isolated according to a radial plane Z, axial force is symmetrical and offset to realize balance, and two sides of the flow passage components suck in the double-suction parallel operation, so that cavitation allowance of the gear pump with the same flow rate as that of the gear pump in the market is reduced, and the flow rate is doubled. Because it is a pair of pinion (4) to install and drive a pair of gear wheel (3) that correspond on pump shaft 7 and rotate to realize inside speed reduction, make this patent gear pump can high-speed operation, and can improve the contact ratio of overlap ratio of gear pump when gear wheel (3) and pinion (4) of both sides interlock each other stagger the quadrant angle installation, further improve bearing capacity. When only the flow channel arrangement of the pump shell (1) is replaced, the aim of high pressure in single-suction series operation can be achieved.

Drawings

Fig. 1 is a schematic diagram of a large-flow high-pressure series-parallel balanced gear pump.

FIG. 2 is a schematic diagram of double-suction parallel operation.

FIG. 3 is a schematic diagram of a single suction series operation.

In the drawings: 1-pump shell, 2-crescent cover plate, 3-big gear, 4-small gear, 5-isolation plate, 6-isolation sleeve, 7-pump shaft, 8-taper sleeve, 9-key, 10-shaft sleeve, 11-gland, 12-screw, 13-partition bolt, 14-hexagon socket bolt, 15-big gear bearing, 16-bearing outer ring sleeve, 17-bearing, 18-bolt.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Specific implementations of the present invention are described in detail below with reference to specific embodiments.

As shown in fig. 1, for an internal gear structure diagram provided by an embodiment of the present invention, main flow passage components symmetrically arranged according to a radial plane Z are installed in a pump casing (1): a pair of small gears (4), a pair of big gears (3), a pair of isolation plates (5) and a pair of crescent cover plates (2). Crescent cover plates (2) on two sides are fixed at two ends of the pump shell (1) by bolts (18); the bearing outer ring sleeve (16) is positioned in the pump shell (1); the two bull gear bearings (15) are positioned in the bearing outer ring sleeve (16); bearings (17) at two ends are arranged in the crescent cover plates (2) at two sides; the pump shaft (7) is mounted in bearings (17) supported at both ends and can rotate freely.

A pair of large gears (3) are arranged in large gear bearings (15) positioned in the pump shell (1) through bearings (15) and are connected through hexagon socket head bolts (14) and can freely rotate together.

The right pinion (4) is radially positioned on the right side of the pump shaft (7) through a key (9), the left pinion (4) is positioned on the left side of the pump shaft (7) through a taper sleeve (8) according to the requirements of assembly clearance and contact ratio, and meanwhile the left pinion (4) and the right pinion are accurately isolated through an isolation sleeve (6). Thus, when the pump shaft (7) rotates, the pair of small gears (4) drives the pair of corresponding large gears (3) to rotate in an engaged manner.

The pinion (4) and the bull gear (3) on the same side are isolated by an isolation plate (5) which is fixed on the crescent cover plate (2) on the same side through a partition plate bolt (13) so as to realize axial pressure balance of the pinion (4) on the same side and liquid isolation on two sides.

As shown in figure 2, when the inlet cavities (1A) and (1C) of the pump shell (1) are communicated at the inlet and the outlet cavities (1B) and (1D) are communicated at the outlet, when the pump shaft (7) drives the pair of pinions (4) at the left side and the right side to rotate, the pair of pinions (3) at the corresponding sides are driven to be meshed and rotate, liquid enters from the two sides of the inlet cavities (1A) and (1C) of the pump shell (1), then enters the gears of the pair of pinions (4) and the pinions (3) at the left side and the right side which are not meshed in an over-rotating mode, and then is extruded through the meshing of the gears of the pair of pinions (4) and the pinions (3) at the left side and the right side at the outlet side of the pump shell (1) and flows out through the outlet cavities (1B) and (1D) of the pump shell (1). Thus, double suction parallel operation of simultaneous suction and simultaneous discharge at both left and right sides is realized.

As shown in figure 3, when the inlet cavities (1A) and (1C) of the pump shell (1) are isolated at the inlet and the outlet cavities (1B) and (1D) are isolated at the outlet, when the pump shaft (7) drives the pair of pinions (4) at the left side and the right side to rotate, the pair of pinions (3) at the corresponding sides are driven to engage and rotate, liquid enters from the inlet cavity (1A) of the pump shell (1), then enters the left side (lower side) rotating and non-engaging pinions (4) and the gears of the pinions (3), then is extruded to the outlet cavity (1B) through the engagement of the left side (lower side) pinions (4) and the gears of the pinions (3) at the outlet side of the pump shell (1), then flows into the inlet cavity (1C) of the pump shell (1) through the internal flow passage of the pump shell (1), and then enters the right side (upper side) rotating and non-engaging pinions (4) and the gears of the, and then the outlet side of the pump shell (1) is extruded to an outlet cavity (1D) through meshing of a right side (upper side) pinion (4) and a gear of the bull gear (3), so that the water flows out of the pump shell (1). Thus, the double-suction parallel operation that one side inlet cavity (1A) sucks, one side outlet cavity (1D) discharges and the left side and the right side operate in series is realized.

And respectively flows out through outlet chambers (1B) and (1D) of the pump shell (1). Thus, single suction series operation of simultaneous suction and simultaneous discharge at both left and right sides is realized.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.