Internal meshing gear pump

Abstract

The utility model discloses an internal meshing gear pump which comprises a pump body, a first delivery pipe and a second delivery pipe, the first delivery pipe and the second delivery pipe are respectively communicated and mounted at the top end and the side wall of the pump body, an internal gear is rotatably mounted in the pump body, an external gear ring is arranged on the inner wall of the pump body, and the internal gear is meshed with the external gear ring. Cover plates are connected to the two sides of the pump body through flanges, a rotating shaft is rotationally connected between the two cover plates, the rotating shaft is fixedly connected with the inner gear, a motor is fixedly installed on the side wall of one cover plate, and the output end of the motor is in transmission connection with the rotating shaft. When the crescent plate needs to be replaced, substances in the pump body are emptied firstly, and then the sealing cover on the cover plate is detached, so that the crescent plate can be detached from the interior of the through groove, the whole body does not need to be detached, and the convenience in replacement of the crescent plate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to an internal gear pump. Background Art

[0002] A gear pump is a fluid conveying device that produces a change in working volume by rotating two meshing gears in a pump cylinder, thereby conveying liquid or achieving pressurization. Its simple and compact structure, low manufacturing cost and wide applicability make it play an important role in many industrial fields such as chemical, petroleum, and food processing. It can efficiently and reliably handle media with high viscosity or containing solid particles, and it is easy to control the flow rate by adjusting the speed, showing excellent performance.

[0003] Gear pumps are mainly divided into two types: external gear pumps and internal gear pumps. Compared with external gear pumps, internal gear pumps have significant advantages in some aspects. First, the internal gear design makes the pump structure more compact and occupies less space, which is very suitable for installation in space-constrained environments. Secondly, because the gears of the internal gear pump are built-in, this design makes the pump more stable during operation, reduces vibration and noise, and improves the comfort of the working environment. In addition, the internal gear pump also performs well in sealing performance, which can effectively prevent leakage, thereby improving the working efficiency and service life of the pump. In general, the internal gear pump has obvious advantages over the external gear pump in many industrial applications with its compact structural design, good running stability and excellent sealing performance.

[0004] Patent document CN213232742U discloses an internal gear pump, which is improved on the basis of the original housing, the inner gear ring set in the inner cavity of the housing and freely rotating, the pinion gear meshing with the inner gear ring and positioned on the transmission shaft, and the crescent block arranged between the tooth top of the pinion gear and the tooth top of the inner gear ring, that is, the inner gear ring is also gap-matched with a composite bushing positioned in the inner cavity of the housing, and the composite bushing is composed of a matrix, an alloy layer sintered on the inner surface of the matrix, and a polymer material layer with polytetrafluoroethylene as the main body coated on the alloy layer. After adopting the above structure, the utility model can effectively avoid the direct contact between the inner gear ring and the inner surface of the pump body on the one hand, greatly reducing the occurrence of the phenomenon of pulling and biting during operation, so it has the characteristics of good working reliability and long service life; on the other hand, with the help of the steel-polytetrafluoroethylene friction pair, the friction coefficient is reduced by one order of magnitude, and the self-lubricating performance is good, which can significantly improve the friction characteristics. At the same time, it has the advantages of low operating noise, high volumetric efficiency, and strong corrosion resistance.

[0005] As in the prior art of the above-mentioned patent, the above-mentioned crescent plate plays a vital role in the internal gear pump. It mainly serves to separate the high and low pressure chambers and guide the gears to mesh correctly. It is a key component to ensure the stable operation of the pump and maintain the sealing. However, long-term use will inevitably lead to wear of the crescent plate. This wear is mainly due to the continuous high-speed friction between the crescent plate and the gear during the operation of the gear pump, coupled with the scouring effect of tiny particles that may exist in the pumping medium, which together lead to the gradual loss of the crescent plate. The worn crescent plate will affect the performance and efficiency of the pump, and in severe cases may even cause the pump to fail. When the crescent plate is worn to a certain extent and needs to be replaced, it is usually necessary to disassemble the entire gear pump of the above-mentioned device. This process is not only cumbersome and time-consuming, but also has the risk of damaging other parts in the pump. Moreover, each disassembly and assembly may introduce new installation errors, thereby affecting the working state of the pump. Utility Model Content

[0006] The utility model aims to provide an internal gear pump to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an internal gear pump, comprising a pump body and a first delivery pipe and a second delivery pipe respectively connected and installed on the top and side wall of the pump body, an internal gear is rotatably installed inside the pump body, an outer gear ring is provided on the inner wall of the pump body, the internal gear and the outer gear ring are meshed with each other, cover plates are flange-connected on both sides of the pump body, a rotating shaft is rotatably connected between the two cover plates, the rotating shaft is fixedly connected to the internal gear, a motor is fixedly installed on the side wall of one of the cover plates, the output end of the motor is transmission-connected to the rotating shaft, through grooves are provided on the side walls of the two cover plates, a crescent plate is slidably installed between the two through grooves, a plurality of mounting holes are provided on the side walls on both sides of the crescent plate, the length of the crescent plate is longer than the distance between the two through grooves, a sealing cover is provided on one side of the two through grooves, a plurality of first bolts are threadedly installed on the side wall of the sealing cover, and the plurality of first bolts are threadedly connected to the plurality of mounting holes.

[0008] As a further description of the above technical solution: the side wall of the crescent plate is provided with a wear-resistant layer.

[0009] As a further description of the above technical solution: the outer side wall and the inner side wall of the sealing cover are fixedly installed with an outer sealing strip and an inner sealing strip, and the outer sealing strip and the inner sealing strip are respectively arranged around the through groove, and the outer sealing strip and the inner sealing strip are tightly fitted with the crescent plate.

[0010] As a further description of the above technical solution: the side walls of the two cover plates are fixedly mounted with fixing plates, the fixing plates are threadedly mounted with second bolts, and the second bolts are threadedly connected to the top and bottom ends of the sealing cover.

[0011] As a further description of the above technical solution: a sealing ring is provided between the connection between the cover plate and the pump body.

[0012] As a further description of the above technical solution: the inner wall of the sealing cover is provided with a magnetic attraction layer, and the sealing cover is magnetically connected to the crescent plate through the magnetic attraction layer.

[0013] As a further description of the above technical solution: filters are detachably provided inside the first delivery pipe and the second delivery pipe.

[0014] The utility model provides an internal gear pump, which has the following beneficial effects: due to frequent use, the crescent plate of the utility model will be worn. When the crescent plate needs to be replaced, the material in the pump body is first emptied, and after emptying, the sealing cover on the cover plate is removed, and the crescent plate can be removed from the through groove without removing the entire body, which increases the convenience of replacing the crescent plate.

[0015] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0016] This application document provides an overview of various implementations or examples of the technology described in the present disclosure, and is not a comprehensive disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of an internal gear pump proposed by the utility model;

[0018] Figure 2 It is a schematic diagram of the three-dimensional explosion structure of the utility model;

[0019] Figure 3 It is a schematic diagram of the three-dimensional exploded structure of the cover plate, sealing strip and crescent plate of the utility model;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the crescent plate of the utility model.

[0021] Legend:

[0022] 1. First delivery pipe; 2. Pump body; 3. Second delivery pipe; 4. Cover plate; 5. Sealing ring; 6. Rotating shaft; 7. Internal gear; 8. External gear ring; 9. Motor; 10. Crescent plate; 11. Mounting hole; 12. Wear-resistant layer; 13. Sealing cover; 14. First bolt; 15. Fixing plate; 16. Second bolt; 17. External sealing strip; 18. Through groove; 19. Internal sealing strip; 20. Magnetic layer; 21. Filter. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Reference Figure 1-4 , an internal gear pump, comprising a pump body 2 and a first delivery pipe 1 and a second delivery pipe 3 which are respectively connected and installed on the top and side walls of the pump body 2, an internal gear 7 is rotatably installed inside the pump body 2, an outer gear ring 8 is provided on the inner wall of the pump body 2, the internal gear 7 and the outer gear ring 8 are meshed with each other, cover plates 4 are flange-connected on both sides of the pump body 2, a rotating shaft 6 is rotatably connected between the two cover plates 4, the rotating shaft 6 is fixedly connected to the internal gear 7, a motor 9 is fixedly installed on the side wall of one of the cover plates 4, the output end of the motor 9 is transmission-connected to the rotating shaft 6, a through groove 18 is provided on the side walls of the two cover plates 4, a crescent plate 10 is slidably installed between the two through grooves 18, a plurality of mounting holes 11 are provided on the side walls on both sides of the crescent plate 10, the length of the crescent plate 10 is longer than the distance between the two through grooves 18, and one side of the two through grooves 18 is provided with A sealing cover 13, a side wall of which is threadedly mounted with a plurality of first bolts 14, which are threadedly connected to a plurality of mounting holes 11; the pump body 2, the internal gear 7, the external gear ring 8 and the two delivery pipes are all prior art, and their function is to rotate the internal gear 7 under the drive of the motor 9, and the rotation of the internal gear 7 drives the external gear ring 8 to rotate, thereby generating a pressure difference inside the main body, and being able to transport the material inside the first delivery pipe 1 to the inside of the second delivery pipe 3, thereby realizing the transportation of the material through the gear pump. However, due to the frequent use of the gear pump, the crescent plate 10 will be worn. When the crescent plate 10 needs to be replaced, the material inside the pump body 2 is first emptied, and after emptying, the sealing cover 13 on the cover plate 4 is removed, so that the crescent plate 10 can be removed from the inside of the through groove 18, and the entire main body does not need to be dismantled, thereby increasing the convenience of replacing the crescent plate 10.

[0025] As a preferred technical solution of this embodiment, the side wall of the crescent plate 10 is provided with a wear-resistant layer 12; the material of the wear-resistant layer 12 is generally a silicon carbide coating, which has good corrosion resistance and wear resistance, and can increase the service life of the crescent plate 10 and reduce the number of replacements.

[0026] As the preferred technical solution of this embodiment, the outer side wall and the inner side wall of the sealing cover 13 are fixedly installed with an outer sealing strip 17 and an inner sealing strip 19, and the outer sealing strip 17 and the inner sealing strip 19 are respectively arranged around the through groove 18, and the outer sealing strip 17 and the inner sealing strip 19 are tightly fitted with the crescent plate 10; the material of the sealing strip is generally elastic rubber, which can increase the sealing performance of the sealing cover 13 and prevent liquid leakage.

[0027] As a preferred technical solution of this embodiment, the side walls of the two cover plates 4 are fixedly installed with a fixing plate 15, and the fixing plate 15 is threadedly installed with a second bolt 16, and the second bolt 16 is threadedly connected to the top and bottom ends of the sealing cover 13; the sealing cover 13 can be fixed by the second bolt 16, thereby increasing the stability of the sealing cover 13.

[0028] As a preferred technical solution of this embodiment, a sealing ring 5 is arranged between the connection between the cover plate 4 and the pump body 2; the setting of the sealing ring 5 can ensure the sealing between the cover plate 4 and the pump body 2 and prevent the conveying medium from leaking from between the cover plate 4 and the pump body 2.

[0029] As a preferred technical solution of this embodiment, the inner wall of the sealing cover 13 is provided with a magnetic attraction layer 20, and the sealing cover 13 is magnetically connected to the crescent plate 10 through the magnetic attraction layer 20; the provision of the magnetic attraction layer 20 can make the connection between the crescent plate 10 and the sealing cover 13 tighter.

[0030] As a preferred technical solution of this embodiment, a filter screen 21 is detachably provided inside the first delivery pipe 1 and the second delivery pipe 3; the setting of the filter screen 21 can filter the substance during the process of conveying the substance to prevent impurities in the conveying medium from accelerating the wear of the crescent plate 10 and the internal parts of the pump body 2.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An internal gear pump, comprising a pump body (2) and a first delivery pipe (1) and a second delivery pipe (3) which are respectively connected and installed on the top and side wall of the pump body (2), wherein an internal gear (7) is rotatably installed inside the pump body (2), an external gear ring (8) is provided on the inner wall of the pump body (2), the internal gear (7) and the external gear ring (8) are meshed with each other, both sides of the pump body (2) are flange-connected with cover plates (4), a rotating shaft (6) is rotatably connected between the two cover plates (4), the rotating shaft (6) is fixedly connected to the internal gear (7), a motor (9) is fixedly installed on the side wall of one of the cover plates (4), and the output end of the motor (9) is drivingly connected to the rotating shaft (6), characterized in that: The side walls of the two cover plates (4) are provided with through grooves (18), a crescent plate (10) is slidably mounted between the two through grooves (18), the side walls on both sides of the crescent plate (10) are provided with a plurality of mounting holes (11), the length of the crescent plate (10) is longer than the distance between the two through grooves (18), a sealing cover (13) is provided on one side of the two through grooves (18), a plurality of first bolts (14) are threadedly mounted on the side wall of the sealing cover (13), and the plurality of first bolts (14) are threadedly connected to the plurality of mounting holes (11).

2. An internal gear pump according to claim 1, characterized in that: The side wall of the crescent plate (10) is provided with a wear-resistant layer (12).

3. An internal gear pump according to claim 1, characterized in that: An outer sealing strip (17) and an inner sealing strip (19) are fixedly mounted on the outer side wall and the inner side wall of the sealing cover (13); the outer sealing strip (17) and the inner sealing strip (19) are respectively arranged around the through groove (18); and the outer sealing strip (17) and the inner sealing strip (19) are tightly fitted to the crescent plate (10).

4. An internal gear pump according to claim 1, characterized in that: A fixing plate (15) is fixedly mounted on the side walls of the two cover plates (4), a second bolt (16) is threadedly mounted on the fixing plate (15), and the second bolt (16) is threadedly connected to the top and bottom ends of the sealing cover (13).

5. An internal gear pump according to claim 1, characterized in that: A sealing ring (5) is provided between the connection between the cover plate (4) and the pump body (2).

6. An internal gear pump according to claim 1, characterized in that: The inner wall of the sealing cover (13) is provided with a magnetic attraction layer (20), and the sealing cover (13) is magnetically connected to the crescent plate (10) via the magnetic attraction layer (20).

7. An internal gear pump according to claim 1, characterized in that: The first delivery pipe (1) and the second delivery pipe (3) are both detachably provided with filter screens (21).

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