Anti-backflow gear pump

Abstract

The utility model belongs to the technical field of gear pumps, and particularly relates to an anti-backflow gear pump which comprises a shell, a hydraulic cavity is arranged in the shell, a driving shaft and a driven shaft which are parallel to each other are rotatably arranged in the hydraulic cavity, a driving gear is fixedly connected onto the driving shaft, a driven gear is fixedly connected onto the driven shaft, and the driving gear is meshed and matched with the driven gear. An oil inlet hole communicated with the hydraulic cavity is formed in the shell, an oil outlet hole communicated with the hydraulic cavity is formed in the position, opposite to the oil inlet hole, of the shell, and the oil outlet hole is provided with an anti-backflow mechanism. By arranging the backflow prevention mechanism, oil liquid can be prevented from flowing back to the hydraulic cavity through the oil outlet hole after external power driving equipment stops running, and the phenomenon that the hydraulic pressure of a system is insufficient due to backflow of the oil liquid is avoided. By arranging the pressure relief mechanism, when the oil pressure in the oil pressing cavity is too large, redundant oil flows from the oil pressing cavity to the oil suction cavity through the oil return channel, so that the effect of reducing the oil pressure in the oil pressing cavity is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of gear pump technology, and specifically relates to a gear pump that prevents backflow. Background Technology

[0002] Gear pumps, as core components of hydraulic systems, are widely used in industrial production. A gear pump consists of gears, a pump body, and front and rear covers. It transports fluid by changing and moving the working volume between the housing and the meshing gears. When the gears rotate, the volume of the space on the disengaged side increases, creating a vacuum that draws in the fluid. Conversely, the volume of the space on the meshing side decreases, forcing the fluid into the pipeline.

[0003] Traditional gear pumps lack backflow prevention, allowing oil to flow back into the pump from the outlet after the oil supply stops. In some industrial applications, strict control of fluid flow direction is crucial. For example, in hydraulic systems, backflow disrupts normal hydraulic transmission, increasing energy loss and reducing overall transmission efficiency. In some cases, backflow can even lead to insufficient hydraulic pressure and cylinder collapse, potentially causing serious safety accidents. Furthermore, excessively high gear pump speeds can cause excessive output pressure, leading to excessive wear on internal components or shortening the pump's lifespan. Therefore, it is necessary to design a gear pump with anti-backflow and pressure relief functions to address the technical problems of oil backflow and excessive output pressure. Utility Model Content

[0004] The purpose of this invention is to provide a gear pump that prevents backflow, so as to solve the problems mentioned in the background art.

[0005] To achieve the above-mentioned technical objectives, the technical solution of this utility model is as follows:

[0006] A backflow-preventing gear pump includes a housing, an internal hydraulic chamber, a parallel drive shaft and a driven shaft rotatably mounted within the hydraulic chamber, a drive gear fixedly connected to the drive shaft, and a driven gear fixedly connected to the driven shaft, the drive gear and the driven gear meshing with each other, an oil inlet hole communicating with the hydraulic chamber is provided on the housing, and an oil outlet hole communicating with the hydraulic chamber is provided on the housing at a position opposite to the oil inlet hole, the oil outlet hole is provided with an anti-backflow mechanism.

[0007] As a further improvement, the anti-backflow mechanism includes a guide rod located inside the oil outlet hole. Both ends of the guide rod are fixedly connected to support rods, and both support rods are fixedly connected to the inner wall of the oil outlet hole. A sealing disc is slidably connected to the guide rod. A first limiting step is provided on the inner wall of the oil outlet hole, and a sealing ring is fixedly provided on the first limiting step. One end of the sealing disc abuts against the sealing ring, and the other end of the sealing disc is connected to a first spring. The other end of the first spring abuts against the support rod.

[0008] As a further improvement, a front cover is detachably connected to one end of the housing, and a rear cover is detachably connected to the other end of the housing. The driven shaft is rotatably connected to the front cover and the rear cover, and the driving shaft is rotatably connected to the front cover and the rear cover. One end of the driving shaft passes through the front cover, and a pressure relief mechanism is provided on the rear cover.

[0009] As a further improvement, the hydraulic chamber includes an oil suction chamber communicating with the oil inlet and an oil pressure chamber communicating with the oil outlet. The pressure relief mechanism includes a return oil channel located inside the rear end cover. The return oil channel includes a first return oil hole, one end of which communicates with the oil pressure chamber, and the other end of which communicates with a second return oil hole. The second return oil hole communicates with the oil suction chamber. A second limiting step is provided at the connection between the first and second return oil holes. A piston is slidably connected inside the return oil channel, and one end of the piston abuts against the second limiting step. In this embodiment, during operation, if the oil pressure in the hydraulic chamber does not exceed the set value, the piston abuts against the second limiting step, preventing oil from flowing into the return oil channel.

[0010] As a further improvement, a sealing cap is connected to the external thread of the second oil return hole, and a second spring is provided between the other end of the piston and the sealing cap. When the oil pressure in the hydraulic chamber exceeds the set value, the force exerted by the oil on the piston increases, compressing the second spring. Excess oil flows from the pressure chamber into the suction chamber through the return oil channel, thereby reducing the pressure in the pressure chamber.

[0011] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0012] This utility model provides a gear pump with anti-backflow mechanism, which can prevent oil from flowing back into the hydraulic chamber through the oil outlet after the external power drive equipment stops running, thus avoiding insufficient hydraulic pressure in the system due to oil backflow.

[0013] By setting up a pressure relief mechanism, when the oil pressure in the oil pressure chamber is too high, the excess oil flows from the oil pressure chamber to the oil suction chamber through the oil return channel, thereby reducing the oil pressure in the oil pressure chamber and avoiding a series of problems caused by excessive oil pressure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the present invention;

[0016] Figure 3 This is a schematic diagram of the anti-backflow mechanism of this utility model;

[0017] Figure 4 This is a schematic diagram of the pressure relief mechanism of this utility model.

[0018] Wherein: 1-Housing, 101-Hydraulic chamber, 1011-Oil suction chamber, 1012-Oil pressure chamber, 102-Oil inlet, 103-Oil outlet, 2-Drive shaft, 3-Driven shaft, 4-Drive gear, 5-Driven gear, 6-Anti-backflow mechanism, 601-Guide rod, 602-Support rod, 603-Sealing disc, 604-Sealing ring, 605-First spring, 7-Front end cover, 8-Rear end cover, 9-Pressure relief mechanism, 901-Return oil channel, 902-First return oil hole, 903-Second return oil hole, 904-Piston, 905-Sealing cap, 906-Second spring. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. However, those skilled in the art will understand that the embodiments described below are only some embodiments of this utility model, not all embodiments, and are only used to illustrate this utility model, and should not be regarded as limiting the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0020] like Figure 1-4 As shown, a gear pump with anti-backflow mechanism includes a housing 1, a hydraulic chamber 101 inside the housing 1, a parallel drive shaft 2 and a driven shaft 3 rotatably disposed inside the hydraulic chamber 101, a drive gear 4 fixedly connected to the drive shaft 2, and a driven gear 5 fixedly connected to the driven shaft 3, the drive gear 4 and the driven gear 5 meshing with each other, the housing 1 is provided with an oil inlet 102 communicating with the hydraulic chamber 101, and an oil outlet 103 communicating with the hydraulic chamber 101 is provided on the housing 1 at a position opposite to the oil inlet 102, the oil outlet 103 is provided with an anti-backflow mechanism 6. In operation, the drive shaft 2 is connected to the output shaft of an external power drive device, such as an electric motor or a gearbox. The external power drive device rotates the drive shaft 2, which in turn drives the driven gear 5. The volume of the space on the disengaged side of the first drive gear 4 and the first driven gear 5 increases, creating a vacuum. Oil enters the hydraulic chamber 101 through the oil inlet 102. The volume of the space on the meshing side of the drive gear 4 and the driven gear 5 decreases, and the oil is discharged from the hydraulic chamber 101 through the oil outlet 103. After the external power drive device stops operating, the anti-backflow mechanism 6 prevents oil from flowing back into the hydraulic chamber 101 through the oil outlet 103, ensuring normal hydraulic transmission.

[0021] In this embodiment, the anti-backflow mechanism 6 includes a guide rod 601 disposed within the oil outlet 103. Support rods 602 are fixedly connected to both ends of the guide rod 601, and both support rods 602 are fixedly connected to the inner wall of the oil outlet 103. A sealing disc 603 is slidably connected to the guide rod 601. The outer diameter of the sealing disc 603 is smaller than the inner diameter of the oil outlet 103. A first limiting step is provided on the inner wall of the oil outlet 103, and a sealing ring 604 is fixedly provided on the first limiting step to enhance the sealing effect. One end of the sealing disc 603 abuts against the sealing ring 604, and the other end of the sealing disc 603 is connected to a first spring 605. The other end of the first spring 605 abuts against the support rod 602. In normal operation, this embodiment... Figure 3 As shown, the oil exerts a rightward thrust on the sealing disc 603, thereby compressing the first spring 605. The sealing disc 603 disengages from the sealing ring 604, and the oil can be discharged normally. After the operation of this embodiment stops, the oil in the hydraulic chamber 101 no longer exerts a force on the sealing disc 603. The first spring 605 extends and exerts a leftward force on the sealing disc 603, thereby causing the sealing disc 603 to abut against the sealing ring 604. The oil cannot flow back to the hydraulic chamber 101 through the oil outlet 103, thus achieving the effect of preventing backflow.

[0022] In this embodiment, a front cover 7 is detachably connected to one end of the housing 1, and a rear cover 8 is detachably connected to the other end of the housing 1. The driven shaft 3 is rotatably connected to the front cover 7 and the rear cover 8, and the driving shaft 2 is rotatably connected to the front cover 7 and the rear cover 8. One end of the driving shaft 2 passes through the front cover 7, and a pressure relief mechanism 9 is provided on the rear cover 8 to prevent a series of problems caused by excessive output oil pressure.

[0023] In this embodiment, the hydraulic chamber 101 includes an oil suction chamber 1011 communicating with the oil inlet 102 and an oil pressure chamber 1012 communicating with the oil outlet 103. The pressure relief mechanism 9 includes a return oil channel 901 located inside the rear end cover 8. The return oil channel 901 includes a first return oil hole 902. One end of the first return oil hole 902 is connected to the oil pressure chamber 1012, and the other end of the first return oil hole 902 is connected to a second return oil hole 903. The second return oil hole 903 is connected to the oil suction chamber 1011. A second limiting step is provided at the connection between the first return oil hole 902 and the second return oil hole 903. A piston 904 is slidably connected inside the return oil channel 901, and one end of the piston 904 abuts against the second limiting step. When the oil pressure in the oil pressure chamber 1012 is too high, the pressure of the oil on the piston 904 increases and pushes the piston 904 to move. The excess oil flows from the oil pressure chamber 1012 to the oil suction chamber 1011 through the oil return channel 901 to achieve the effect of pressure relief.

[0024] In this embodiment, a sealing cap 905 is externally threaded onto the second oil return hole 903, and a second spring 906 is provided between the other end of the piston 904 and the sealing cap 905. During the depressurization process, the piston 904 moves, compressing the second spring 906. After the depressurization is completed, the pressure of the oil on the piston 904 decreases, the second spring 906 extends and pushes the piston 904 against the second limiting step, and the oil no longer flows to the oil suction chamber 1011.

[0025] In this embodiment, during use, the external power drive device drives the drive shaft 2 to rotate. The volume of the space on the disengaged side of the drive gear 4 and driven gear 5 increases, while the volume of the space on the meshing side decreases. Oil enters the suction chamber 1011 and the pressure chamber 1012 through the oil inlet 102. Under the force of the oil, the sealing disc 603 disengages from the sealing ring 604 and compresses the first spring 605. After the external power drive device stops rotating, the first spring 605 applies a thrust to the sealing disc 603, causing the sealing disc 603 to adhere to the sealing ring 604, preventing oil backflow. When the oil pressure in the pressure chamber 1012 is too high, the pressure of the oil on the piston 904 increases, pushing the piston 904 to move. Excess oil flows from the pressure chamber 1012 to the suction chamber 1011 through the return oil channel 901, achieving a pressure relief effect.

[0026] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A gear pump with anti-backflow capability, comprising a housing, characterized in that, The housing has a hydraulic chamber inside, and a parallel drive shaft and a driven shaft are rotatably mounted inside the hydraulic chamber. A drive gear is fixedly connected to the drive shaft, and a driven gear is fixedly connected to the driven shaft. The drive gear and the driven gear mesh with each other. The housing has an oil inlet hole communicating with the hydraulic chamber, and an oil outlet hole communicating with the hydraulic chamber is located opposite to the oil inlet hole on the housing. The oil outlet hole is equipped with an anti-backflow mechanism.

2. The anti-backflow gear pump according to claim 1, characterized in that, The anti-backflow mechanism includes a guide rod disposed in the oil outlet hole. Both ends of the guide rod are fixedly connected to support rods. Both support rods are fixedly connected to the inner wall of the oil outlet hole. A sealing disc is slidably connected to the guide rod. A first limiting step is provided on the inner wall of the oil outlet hole. A sealing ring is fixedly provided on the first limiting step. One end of the sealing disc abuts against the sealing ring. The other end of the sealing disc is connected to a first spring. The other end of the first spring abuts against the support rod.

3. The anti-backflow gear pump according to claim 1, characterized in that, One end of the housing is detachably connected to a front cover, and the other end of the housing is detachably connected to a rear cover. The driven shaft is rotatably connected to the front cover and the rear cover, and the driving shaft is rotatably connected to the front cover and the rear cover. One end of the driving shaft passes through the front cover, and the rear cover is provided with a pressure relief mechanism.

4. The anti-backflow gear pump according to claim 3, characterized in that, The hydraulic chamber includes an oil suction chamber communicating with the oil inlet and an oil pressure chamber communicating with the oil outlet. The pressure relief mechanism includes a return oil channel located inside the rear end cover. The return oil channel includes a first return oil hole, one end of which communicates with the oil pressure chamber, and the other end of which communicates with a second return oil hole. The second return oil hole communicates with the oil suction chamber. A second limiting step is provided at the connection between the first return oil hole and the second return oil hole. A piston is slidably connected in the return oil channel, and one end of the piston abuts against the second limiting step.

5. A gear pump for preventing backflow according to claim 4, characterized in that, The second oil return hole is externally threaded with a sealing cap, and a second spring is provided between the other end of the piston and the sealing cap.

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