Gear pump with high sealing performance

Abstract

The utility model provides a gear pump with high sealing performance, and belongs to the technical field of gear pumps. The problem that in the prior art, a gear pump is insufficient in sealing performance is solved. The pump comprises a pump head and a pump shell, the pump head is connected with one side of the pump shell, a first cam rotor and a second cam rotor are arranged in the pump head, one side of the pump shell is fixedly connected with a pump side cover, a driving shaft and a driven shaft are arranged in the pump shell, and the driving shaft and the driven shaft are longitudinally arranged. The end of the driving shaft and the end of the driven shaft are fixedly sleeved with a driving gear and a driven gear respectively, the portion, on one side of the driving gear, of the driving shaft is fixedly sleeved with a first sealing ring, one end of the driving shaft extends out of the pump side cover, and the other end of the driving shaft is connected with a first cam rotor. A third sealing ring is fixedly sleeved on the driving shaft on one side of the first shaft connecting bearing, the third sealing ring is fixedly attached to the end face of the outer side of the pump shell, a second sealing ring is fixedly sleeved on the driven shaft on one side of the driven gear, the other end of the driven shaft extends into the pump head and is connected with a second cam rotor, and a second shaft connecting bearing is fixedly sleeved on the driven shaft. A fourth sealing ring is fixedly arranged on the driven shaft on one side of the second shaft connecting bearing in a sleeving mode and fixedly attached to the end face of the outer side of the pump shell. The sealing structure has the advantage of being good in sealing performance.

Description

Technical Field

[0001] This utility model belongs to the field of gear pump technology and relates to a high-sealing gear pump. Background Technology

[0002] Gear pumps are a common type of hydraulic pump. They achieve liquid transport by changing the volume of the sealed space through the meshing and disengagement of gears. When a gear pump is working, there is a pressure difference between the suction chamber and the discharge chamber. If the sealing is not good, high-pressure liquid will leak from the discharge chamber to the suction chamber, resulting in a reduction in the actual output flow rate and a decrease in volumetric efficiency, which will fail to meet the required flow and pressure for operation.

[0003] Chinese patent publication number CN207686968U discloses a gear pump, including a housing, a pair of meshing gears disposed within the housing, gear shafts passing through each gear, bearings supporting the outside of each gear shaft, and front and rear covers disposed at opposite ends of the housing. The inner circumferential surface of the housing forms two receiving holes in the shape of spectacle holes, and the pair of gears are received in the two receiving holes. A high-pressure section is provided at the end of the racks of the two gears that gradually approach each other and meshes, and a low-pressure section is provided at the end of the racks of the two gears that gradually separates. The front cover is provided with a high-pressure port for oil suction and discharge and a low-pressure port corresponding to the high-pressure section and the low-pressure section, respectively. Each bearing is a cylindrical shape that extends outward from one side of the gear in a tapering manner.

[0004] The gear pump provided by this patent does not have a seal at the connection between the pump shaft, the gear, and the pump cover. This makes the gear pump prone to insufficient sealing during actual use, thus affecting the overall use of the gear pump. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by providing a gear pump with high sealing performance.

[0006] The objective of this utility model can be achieved through the following technical solution: A high-sealing gear pump includes a pump head and a pump casing. The pump head is connected to one side of the pump casing. A first cam rotor and a second cam rotor are disposed inside the pump head. A pump side cover is fixedly connected to one side of the pump casing. A drive shaft and a driven shaft are disposed inside the pump casing. The drive shaft and the driven shaft are arranged longitudinally. A drive gear and a driven gear are respectively sleeved and fixed at the ends of the drive shaft and the driven shaft. A first sealing ring is sleeved and fixed on the drive shaft on one side of the drive gear. One end of the drive shaft extends out of the pump side cover and the other end... One end is connected to the first cam rotor. A first shaft bearing is fixedly fitted on the drive shaft. A third sealing ring is fixedly fitted on the drive shaft on one side of the first shaft bearing. The third sealing ring is fitted and fixed to the outer end face of the pump housing. A second sealing ring is fixedly fitted on the driven shaft on one side of the driven gear. The other end of the driven shaft extends into the pump head and is connected to the second cam rotor. A second shaft bearing is fixedly fitted on the driven shaft. A fourth sealing ring is fixedly fitted on the driven shaft on one side of the second shaft bearing. The fourth sealing ring is fitted and fixed to the outer end face of the pump housing.

[0007] In the aforementioned high-sealing gear pump, a pump cover is fixedly connected to one side of the pump head, and a sealing groove is formed on the inner side of the pump cover, in which a sealing rubber ring is fixedly installed.

[0008] In the aforementioned high-sealing gear pump, a first sealing sleeve is fixedly fitted onto the drive shaft on one side of the first cam rotor, and a second sealing sleeve is fixedly fitted onto the driven shaft on one side of the second cam rotor.

[0009] In the aforementioned high-sealing gear pump, a first shaft sleeve and a second shaft sleeve are fixedly connected to the inner end face of the pump head, and the first shaft sleeve and the second shaft sleeve are respectively sleeved on the outer ends of the first sealing shaft sleeve and the second sealing shaft sleeve.

[0010] Compared with the prior art, the high-sealing gear pump provided by this utility model has the following beneficial effects: the setting of the first sealing ring and the second sealing ring effectively ensures the sealing between the drive shaft and the driven shaft and the pump side cover; the setting of the third sealing ring and the fourth sealing ring effectively ensures the sealing between the drive shaft and the driven shaft and the inner side of the pump casing; the setting of the first sealing bushing and the second sealing bushing effectively ensures the sealing between the drive shaft and the driven shaft and the pump head, and the setting of the first bushing and the second bushing reduces the external influence on the first sealing bushing and the second sealing bushing, so that this utility model has high sealing performance and long service life. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the internal structure of the first and second shaft sleeves.

[0014] In the diagram: 1. Pump head; 11. First cam rotor; 12. Second cam rotor; 13. Pump cover; 14. Sealing groove; 15. Sealing rubber ring; 2. Pump casing; 21. Pump side cover; 3. Drive shaft; 31. Drive gear; 32. First shaft bearing; 4. Driven shaft; 41. Driven gear; 42. Second shaft bearing; 5. First sealing ring; 6. Second sealing ring; 7. Third sealing ring; 8. Fourth sealing ring; 9. First sealing sleeve; 91. First sleeve; 10. Second sealing sleeve; 101. Second sleeve. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figures 1 to 3 As shown, this embodiment includes a pump head 1 and a pump housing 2. The pump head 1 is connected to one side of the pump housing 2. A first cam rotor 11 and a second cam rotor 12 are arranged inside the pump head 1. The first cam rotor 11 and the second cam rotor 12 are arranged longitudinally. A pump side cover 21 is fixedly connected to one side of the pump housing 2. A drive shaft 3 and a driven shaft 4 are arranged inside the pump housing 2. The drive shaft 3 and the driven shaft 4 are arranged longitudinally. A drive gear 31 is fixedly fitted on the drive shaft 3. A first sealing ring 5 is fixedly fitted on the drive shaft 3 on one side of the drive gear 31. The first sealing ring 5 ensures the sealing between the drive shaft 3 and the pump side cover 21. One end of the drive shaft 3 extends out of the pump side cover 21 and the other end is connected to the first cam rotor. The first cam rotor 11 is connected to the first cam rotor 11. A first shaft bearing 32 is fixedly fitted on the drive shaft 3. A third sealing ring 7 is fixedly fitted on the drive shaft 3 on one side of the first shaft bearing 32. The third sealing ring 7 is fitted and fixed to the outer end face of the pump housing 2. The third sealing ring 7 ensures the sealing between the drive shaft 3 and the inner side of the pump housing 2. A first sealing bushing 9 is fixedly fitted on the drive shaft 3 on one side of the first cam rotor 11. The first sealing bushing 9 ensures the sealing between the drive shaft 3 and the pump head 1. A first bushing 91 is fixedly connected to the inner end face of the pump head 1 near the upper end. The first bushing 91 is fitted on the outer end of the first sealing bushing 9. The first bushing 91 protects the first sealing shaft.

[0017] like Figures 1 to 3As shown, a second sealing ring 6 is fixedly fitted on the driven shaft 4 on one side of the driven gear 41. The second sealing ring 6 ensures the sealing between the driven shaft 4 and the pump side cover 21. The other end of the driven shaft 4 is connected to the second cam rotor 12. A second shaft bearing 42 is fixedly fitted on the driven shaft 4. A fourth sealing ring 8 is fixedly fitted on the driven shaft 4 on one side of the second shaft bearing 42. The fourth sealing ring 8 is fitted and fixed to the outer end face of the pump housing 2. The fourth sealing ring 8 ensures the sealing between the driven shaft 4 and the inner side of the pump housing 2. A second sealing bushing 10 is fixedly fitted on the driven shaft 4 on one side of the second cam rotor 12. The second sealing bushing 10 ensures the sealing between the driven shaft 4 and the pump head 1. A second bushing 101 is fixedly connected to the inner end face of the pump head 1 near the lower end. The second bushing 101 is fitted on the outer end of the second sealing bushing 10. The second bushing 101 protects the second sealing shaft.

[0018] To elaborate further, such as Figures 1 to 3 As shown, a pump cover 13 is fixedly connected to one side of the pump head 1. A sealing groove 14 is opened on the inner side of the pump cover 13. A sealing rubber ring 15 is fixedly installed in the sealing groove 14. The sealing rubber ring 15 ensures the internal sealing when the pump cover 13 and the pump head 1 are connected.

[0019] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0020] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A high-sealing gear pump, comprising a pump head (1) and a pump housing (2), wherein the pump head (1) is connected to one side of the pump housing (2), a first cam rotor (11) and a second cam rotor (12) are disposed inside the pump head (1), and a pump side cover (21) is fixedly connected to one side of the pump housing (2), characterized in that: The pump housing (2) is internally provided with a driving shaft (3) and a driven shaft (4), which are arranged longitudinally, and the driving shaft (3) and the driven shaft (4) are respectively sleeved with a driving gear (31) and a driven gear (41) at the ends, the first sealing ring (5) is sleeved and fixed on one side of the driving shaft (3), one end of the driving shaft (3) extends out of the pump side cover (21) and the other end is connected with the first cam rotor (11), the first shaft connecting bearing (32) is sleeved and fixed on the driving shaft (3), the third sealing ring (7) is sleeved and fixed on one side of the driving shaft (3), the third sealing ring (7) is fixedly attached to the outer end face of the pump housing (2), the second sealing ring (6) is sleeved and fixed on one side of the driven gear (41) of the driven shaft (4), the other end of the driven shaft (4) extends into the pump head (1) and is connected with the second cam rotor (12), the second shaft connecting bearing (42) is sleeved and fixed on the driven shaft (4), the fourth sealing ring (8) is sleeved and fixed on one side of the driven shaft (4), and the fourth sealing ring (8) is fixedly attached to the outer end face of the pump housing (2).

2. A high containment gear pump according to claim 1, characterized in that: The pump head (1) is fixedly connected with a pump cover (13) on one side, a sealing groove (14) is formed in the inner side of the pump cover (13), and a sealing rubber ring (15) is fixedly installed in the sealing groove (14).

3. A high containment gear pump in accordance with claim 1, wherein: The first sealing shaft sleeve (9) is sleeved and fixed on one side of the driving shaft (3) of the first cam rotor (11), and the second sealing shaft sleeve (10) is sleeved and fixed on one side of the driven shaft (4) of the second cam rotor (12).

4. A high containment gear pump according to claim 3, wherein: The first shaft sleeve (91) and the second shaft sleeve (101) are fixedly connected to the inner end face of the pump head (1), and the first shaft sleeve (91) and the second shaft sleeve (101) are respectively sleeved on the outer ends of the first sealing shaft sleeve (9) and the second sealing shaft sleeve (10).

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