Anti-suction safety type gear lubricating pump

Abstract

The utility model relates to a kind of anti-reverse suction safety type gear lubrication pump, belong to gear lubrication pump technical field;Including the pump body and rear cover of mutual fixed connection, the driving gear and the driven gear of the meshing of being rotatably arranged in pump body interior, suction chamber and discharge chamber are arranged in pump body interior, anti-reverse suction valve is arranged between suction chamber and discharge chamber in pump body interior;Safety valve is arranged in rear cover interior, safety valve is arranged between suction chamber and discharge chamber;When driving gear reverses, anti-reverse suction valve opens, oil liquid backflow inlet, gear lubrication pump rotates and does not suck oil supply, to ensure that the oil liquid in host lubricating oil circuit does not reduce;When external load pressure increases, oil pressure of oil outlet rises, overcomes second spring, safety valve opens, pressure oil backflow to inlet, to ensure that the pressure fluctuation in main lubrication path is not big;Solved the problem that the movement of host is not smooth due to the instability of oil pump oil supply caused by external factors.

Description

Technical Field

[0001] This utility model belongs to the field of gear lubrication pump technology, specifically relating to a safe gear lubrication pump with anti-backflow design. Background Technology

[0002] The lubrication system is an auxiliary system within the main unit's operating systems; therefore, the primary goal of the gear lubrication pump is to ensure the normal operation of the main unit under all operating conditions. The inlet pipe connects to the oil tank, and the outlet pipe connects to the main unit's lubrication system. After the pipes are connected, the direction of each port is locked, ensuring the lubricant flows from the oil tank to the main unit's lubrication system for normal operation. Reverse flow in the oil circuit is crucial for proper main unit operation; otherwise, the main unit will malfunction. However, due to the rigid mechanical transmission connection of the main unit, the pump's power take-off shaft may reverse its rotation under certain operating conditions. While the pump is bidirectional, when the power take-off shaft reverses, the pump reverses as well, changing the oil circuit direction—from inlet to pressure and outlet to suction. The pump rapidly removes oil from the main unit's lubrication circuit, causing dry friction components in the main unit to burn due to lack of lubrication. Therefore, designing an anti-backflow device in the pump is essential.

[0003] The pressure in a hydraulic lubrication system is determined by external factors. When external resistance suddenly increases, the moving parts of the main unit transmit pressure to the lubrication system, increasing the outlet pressure of the oil pump. This leads to a sudden increase in pressure within the pump's internal cavity. The constantly operating pump then feeds back the suddenly pressure-changed oil to the main unit's lubrication lines, creating flow and pressure pulsations, which further affect the stability of the main unit's movement. To avoid this, it is essential to use an oil pump with relatively stable oil pressure to ensure the smooth movement of the main unit's working parts. Utility Model Content

[0004] This invention overcomes the shortcomings of the prior art and proposes a safe gear lubrication pump with anti-backflow design; it solves the problem of unstable operation of the main unit caused by unstable oil supply from the oil pump due to external factors.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0006] A backflow-proof safety gear lubrication pump includes a pump body and a rear cover fixedly connected to each other. A driving gear and a driven gear are rotatably arranged inside the pump body and mesh with each other. A suction chamber and a discharge chamber are provided inside the pump body. An backflow-proof valve is provided inside the pump body and is located between the suction chamber and the discharge chamber. A safety valve is provided inside the rear cover and is located between the suction chamber and the discharge chamber.

[0007] Furthermore, corresponding positioning pin holes are provided on the pump body and the rear cover respectively, and the same hollow positioning pin is inserted into the corresponding positioning pin holes of the pump body and the rear cover; the screw passes through the rear cover and is screwed to the pump body, thereby fixing the pump body and the rear cover together.

[0008] Furthermore, a drive shaft and a driven shaft are rotatably installed inside the pump body. The front and rear ends of the driven shaft are rotatably connected to the inner walls of the pump body and the rear cover, respectively. The drive gear is fixedly sleeved on the outside of the drive shaft, and the driven gear is fixedly sleeved on the outside of the driven shaft.

[0009] Furthermore, a front oil seal hole is provided on the pump body, and a rear oil seal hole is provided on the rear cover. The front end of the drive shaft extends through the front oil seal hole to the outside of the pump body, and the rear end of the drive shaft extends through the rear oil seal hole to the outside of the rear cover. Oil seals are fixedly installed inside both the front and rear oil seal holes, and the oil seals are sleeved on the outside of the drive shaft. Inclined holes are provided on both the pump body and the rear cover. The oil seals inside the front and rear oil seal holes are connected to the oil inlet through the aforementioned inclined holes, thereby ensuring that the oil pressure at the bottom of the oil seal remains low.

[0010] Furthermore, the outer opening of the suction chamber is the oil inlet, and the outer opening of the discharge chamber is the oil outlet. When the drive shaft drives the drive gear to rotate in the forward direction, the side where the drive gear and driven gear disengage is the suction chamber of the pump body, and the side where the drive gear and driven gear mesh is the discharge chamber. The enclosed space formed between the drive gear, driven gear, and the inner wall of the pump body is the transition chamber. The suction chamber is the low-pressure area, the discharge chamber is the high-pressure area, and the transition chamber is the pressure transition area between the high-pressure area and the low-pressure area.

[0011] Furthermore, a cylindrical inner hole is provided on the inner wall of the pump body on the side away from the rear cover, and the cylindrical inner hole is located inside the suction chamber; the anti-backflow valve is provided inside the cylindrical inner hole, and the anti-backflow valve includes a valve body, a valve seat, a valve pad, and a first spring; a first connecting groove is also provided inside the pump body, one end of the first connecting groove is connected to one end of the inner side of the cylindrical inner hole, and the other end of the first connecting groove is connected to the discharge chamber.

[0012] Furthermore, the valve body is composed of three cylindrical sections of different diameters: a primary cylinder, a secondary cylinder, and a tertiary cylinder, which are sequentially and fixedly connected. The inner diameter of the primary cylinder is larger than that of the secondary cylinder, and the inner diameter of the secondary cylinder is larger than that of the tertiary cylinder. All three cylinders are aligned with the axis of the cylindrical inner bore. The primary cylinder is fixedly positioned at the opening of the cylindrical inner bore, and the tertiary cylinder is located at one end of the inner side of the cylindrical inner bore, maintaining a distance between itself and the inner end face of the cylindrical inner bore. The primary cylinder is connected to the suction chamber, and the end of the tertiary cylinder closest to the inner side of the cylindrical inner bore remains open. A connecting hole is provided on the connecting ring between the secondary and tertiary cylinders, allowing the interior of the secondary cylinder to communicate with the interior of the cylindrical inner bore.

[0013] Furthermore, a valve seat is fixedly installed inside the first-stage cylinder, and three oil passage holes are provided on the valve seat. A circular plate-shaped valve gasket is installed inside the second-stage cylinder, and a first spring is fixedly installed inside the third-stage cylinder. One end of the first spring is fixedly connected to the end of the third-stage cylinder away from the second-stage cylinder, and the other end of the first spring is fixedly connected to the valve gasket. Under the action of the rebound force of the first spring, the valve gasket and the valve seat are in close contact.

[0014] Furthermore, a mounting hole is provided inside the rear cover, and the aforementioned safety valve is installed inside the mounting hole; the safety valve includes a safety valve body, a screw plug, and a second spring; a second connecting groove and a third connecting groove are provided inside the rear cover, one end of the second connecting groove is connected to the discharge chamber, and the other end of the second connecting groove is connected to the inner side of the mounting hole; one end of the third connecting groove is connected to the suction chamber, and the other end of the third connecting groove is connected to the inner wall of the mounting hole.

[0015] Furthermore, the safety valve body is a cylindrical structure with one open end, the open end of the safety valve body facing the outer opening of the mounting hole, and the outer wall of the safety valve body maintaining sliding contact with the inner wall of the mounting hole; the screw plug is screwed into the outer opening of the mounting hole; a second spring is provided inside the mounting hole, one end of the second spring abutting against the inside of the safety valve body, and the other end of the second spring abutting against the inside of the screw plug; through the rebound force of the second spring, the safety valve body is tightly abutting against the inner end of the mounting hole, and the safety valve body isolates the second connecting groove from the third connecting groove.

[0016] The beneficial effects of this utility model compared to the prior art are as follows:

[0017] This utility model provides a safe gear lubrication pump with anti-backflow design. By improving the structural design and optimizing the fluid pressure chamber setting, the fluid flow path is changed under different pressures, so that the pump will not backflow the oil in the main unit's lubrication circuit when the external power reverses. The pressure of the oil supplied to the main unit can be maintained within a certain range in the lubrication circuit, so that the main unit will not generate unnecessary pressure waves due to pressure fluctuations in the lubrication circuit, thus reducing the impact and damage to the main unit and greatly improving the working stability of the entire lubrication circuit. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram showing the relative positions of the suction chamber, discharge chamber, and transition chamber inside the pump body;

[0021] Figure 3 yes Figure 2AA section view in the middle;

[0022] Figure 4 yes Figure 1 BB section view in the middle;

[0023] Among them, 1 is the pump body, 2 is the rear cover, 3 is the driving gear, 4 is the driven gear, 5 is the suction chamber, 6 is the discharge chamber, 7 is the positioning hollow pin, 8 is the screw, 9 is the driving drive shaft, 10 is the driven drive shaft, 11 is the oil seal, 12 is the transition chamber, 13 is the valve body, 14 is the valve seat, 15 is the valve gasket, 16 is the first spring, 17 is the oil passage hole, 18 is the first connecting groove, 19 is the safety valve body, 20 is the screw plug, 21 is the second spring, 22 is the second connecting groove, and 23 is the third connecting groove. Detailed Implementation

[0024] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0025] like Figure 1 As shown in Figure 4, this utility model provides a gear lubrication pump with anti-backflow safety, including a pump body 1 and a rear cover 2 fixedly connected to each other. A driving gear 3 and a driven gear 4 are rotatably arranged inside the pump body 1 and mesh with each other. A suction chamber 5 and a discharge chamber 6 are arranged inside the pump body 1. An anti-backflow valve is arranged inside the pump body 1 and is located between the suction chamber 5 and the discharge chamber 6. A safety valve is arranged inside the rear cover 2 and is located between the suction chamber 5 and the discharge chamber 6.

[0026] Corresponding locating pin holes are provided on the pump body 1 and the rear cover 2, respectively. The same hollow locating pin 7 is inserted into the corresponding locating pin holes of the pump body 1 and the rear cover 2. The hollow locating pin 7 is used to position the assembly of the pump body 1 and the rear cover 2. The screw 8 passes through the rear cover 2 and is screwed into the pump body 1, thereby fixing the pump body 1 and the rear cover 2 together.

[0027] Inside the pump body 1, a drive shaft 9 and a driven shaft 10 are rotatably mounted. The front and rear ends of the driven shaft 10 are rotatably connected to the inner walls of the pump body 1 and the rear cover 2, respectively. A drive gear 3 is fixedly sleeved on the outside of the drive shaft 9, and a driven gear 4 is fixedly sleeved on the outside of the driven shaft 10. A front oil seal hole is provided on the pump body 1, and a rear oil seal hole is provided on the rear cover 2. The front end of the drive shaft 9 extends through the front oil seal hole to the outside of the pump body 1, and the rear end of the drive shaft 9 extends through the rear oil seal hole to the outside of the rear cover 2. Oil seals 11 are fixedly installed inside both the front and rear oil seal holes, and the oil seals 11 are sleeved on the outside of the drive shaft 9.

[0028] The outer opening of the suction chamber 5 is the oil inlet, and the outer opening of the discharge chamber 6 is the oil outlet. When the drive shaft 9 drives the drive gear 3 to rotate in the forward direction, the side where the drive gear 3 and the driven gear 4 are disengaged is the suction chamber 5 of the pump body 1, and the side where the drive gear 3 and the driven gear 4 are engaged is the discharge chamber 6. The enclosed space formed between the drive gear 3 and the driven gear 4 and the inner wall of the pump body 1 is the transition chamber 12; the suction chamber 5 is the low-pressure zone ( Figure 2 The blue area in the middle), the discharge chamber 6 is the high-pressure zone ( Figure 2 The red area in the image), transition cavity 12 is the pressure transition zone between the high-pressure zone and the low-pressure zone ( Figure 2 (The pink area in the middle).

[0029] Both the pump body 1 and the rear cover 2 are provided with oblique holes. The oil seal 11 inside the front oil seal hole and the rear oil seal hole is connected to the oil inlet through the above-mentioned oblique holes, so that the oil pressure at the bottom of the oil seal 11 is always kept low.

[0030] A cylindrical inner hole is provided on the inner wall of the pump body 1 on the side away from the rear cover 2, and the cylindrical inner hole is located inside the suction chamber 5. The anti-backflow valve is provided inside the cylindrical inner hole, and the anti-backflow valve includes a valve body 13, a valve seat 14, a valve pad 15, and a first spring 16. A first connecting groove 18 is also provided inside the pump body 1. One end of the first connecting groove 18 is connected to one end of the inner side of the cylindrical inner hole, and the other end of the first connecting groove 18 is connected to the discharge chamber 6.

[0031] The valve body 13 is composed of three cylindrical sections of different diameters: a primary cylinder, a secondary cylinder, and a tertiary cylinder, which are sequentially and fixedly connected. The inner diameter of the primary cylinder is larger than that of the secondary cylinder, and the inner diameter of the secondary cylinder is larger than that of the tertiary cylinder. All three cylinders are aligned with the axis of the cylindrical inner bore. The primary cylinder is fixedly positioned at the opening of the cylindrical inner bore, and the tertiary cylinder is located at one end of the inner side of the cylindrical inner bore, maintaining a distance between itself and the inner end face of the cylindrical inner bore. The primary cylinder is in communication with the suction chamber 5, and the end of the tertiary cylinder closest to the inner side of the cylindrical inner bore remains open. A connecting hole is provided on the connecting ring between the secondary and tertiary cylinders, allowing communication between the interior of the secondary cylinder and the interior of the cylindrical inner bore.

[0032] A circular plate-shaped valve seat 14 is fixedly installed inside the first-stage cylinder. Three oil passage holes 17 are provided on the valve seat 14, connecting the suction chamber 5 to the interior of the second-stage cylinder. A circular plate-shaped valve gasket 15 is installed inside the second-stage cylinder. The outer diameter of the valve gasket 15 is smaller than the inner diameter of the second-stage cylinder, and the thickness of the valve gasket 15 is smaller than the thickness of the second-stage cylinder. A first spring 16 is fixedly installed inside the third-stage cylinder. One end of the first spring 16 is fixedly connected to the end of the third-stage cylinder furthest from the second-stage cylinder, and the other end is fixedly connected to the valve gasket 15. Under the restoring force of the first spring 16, the valve gasket 15 is in close contact with the valve seat 14, thereby blocking the oil passage holes 17 on the valve seat 14 and isolating the suction chamber 5 from the inner side of the valve body 13 and the inner side of the cylindrical inner hole.

[0033] An installation hole is provided inside the rear cover 2, and the aforementioned safety valve is installed inside the installation hole. The safety valve includes a safety valve body 19, a screw plug 20, and a second spring 21. A second connecting groove 22 and a third connecting groove 23 are provided inside the rear cover 2. One end of the second connecting groove 22 is connected to the discharge chamber 6, and the other end of the second connecting groove 22 is connected to the inner side of the installation hole. One end of the third connecting groove 23 is connected to the suction chamber 5, and the other end of the third connecting groove 23 is connected to the inner wall of the installation hole.

[0034] The safety valve body 19 is a cylindrical structure with one open end, facing the outer opening of the mounting hole. The outer wall of the safety valve body 19 maintains sliding contact with the inner wall of the mounting hole. The screw plug 20 is screwed into the outer opening of the mounting hole. A second spring 21 is installed inside the mounting hole, with one end abutting against the inside of the safety valve body 19 and the other end abutting against the inside of the screw plug 20. The rebound force of the second spring 21 ensures that the safety valve body 19 is tightly abutted against the inner end of the mounting hole, thus isolating the second connecting groove 22 from the third connecting groove 23. Under normal operating conditions, the pressure generated by the high-pressure oil is less than the preload of the second spring 21, and the pressure of the high-pressure oil is insufficient to move the safety valve body 19. All the oil from the gear lubrication pump is output from the oil outlet.

[0035] The working principle of this utility model is as follows:

[0036] When the external power take-off shaft drives the drive shaft 9 to rotate in the forward direction, the drive shaft 9 drives the drive gear 3 to rotate in the forward direction. The drive gear 3 drives the meshing driven gear 4 to rotate. The oil inside the oil tank enters the suction chamber 5 of the pump body 1 from the oil inlet. The oil is transported from the low-pressure area of ​​the suction chamber 5 to the high-pressure area of ​​the discharge chamber 6 and discharged outward through the oil outlet. In this state, both the anti-backflow valve and the safety valve are normally closed and do not work.

[0037] When the external power take-off shaft drives the drive shaft 9 to rotate in the opposite direction, the drive shaft 9 drives the drive gear 3 to rotate in the opposite direction. At this time, the suction chamber 5 and the discharge chamber 6 inside the pump body 1 are converted into each other, that is, the original suction chamber 5 is converted into the discharge chamber 6, and the original discharge chamber 6 is converted into the suction chamber 5. Figure 2 The blue area in the image turns into a red area. Figure 2 The red area in the diagram changes to the blue area, at which point the anti-backflow valve is located inside the changed discharge chamber 6, meaning the anti-backflow valve is located inside the high-pressure zone. For example... Figure 3 As shown, in this state, the valve pad 15 begins to compress the first spring 16 under the oil pressure in the high-pressure zone, causing the valve pad 15 to separate from the valve seat 14, creating a gap between the valve seat 14 and the valve pad 15. The oil in the high-pressure zone enters the valve body 13 and the cylindrical inner hole through the oil passage 17 on the valve seat 14, and flows back to the suction chamber 5 (low-pressure zone) along the first connecting groove 18, quickly replenishing the suction chamber 5 with the oil discharged from the discharge chamber 6. At this time, the gear lubrication pump only rotates without supplying oil, which can effectively prevent the oil in the main unit's lubrication circuit from decreasing, and alleviate the problems of reduced load-bearing capacity and local wear and burns caused by lack of lubrication in the moving parts of the main unit.

[0038] like Figure 4As shown, when the external load suddenly increases during the normal operation of the gear lubrication pump, the pressure inside the load chamber (discharge chamber 6) rises rapidly in a short time. At this time, the pressure exerted on the safety valve by the load chamber (discharge chamber 6) suddenly increases, and the pressure on the second spring 21 is greater than its rebound force, causing the second spring 21 to begin to compress. The second spring 21 drives the safety valve body 19 to slide towards the side closer to the screw plug 20, so that the second connecting groove 22 and the third connecting groove 23 are connected to each other. Thus, the high-pressure oil inside the load chamber (discharge chamber 6) flows back to the low-pressure area inside the suction chamber 5 through the second connecting groove 22 and the third connecting groove 23, so that the pressure in the load chamber (discharge chamber 6) drops rapidly, that is, the pressure of the main oil circuit lubrication system drops, and the excessively high-pressure oil will not be supplied to the lubrication circuit again, thus realizing the function of protecting the main circuit.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A gear lubrication pump with anti-backflow safety feature, characterized in that: The pump body (1) and the rear cover (2) are fixedly connected to each other. Inside the pump body (1), there are meshing drive gears (3) and driven gears (4). Inside the pump body (1), there are suction chambers (5) and discharge chambers (6). Inside the pump body (1), there is an anti-backflow valve, which is located between the suction chamber (5) and the discharge chamber (6). Inside the rear cover (2), there is a safety valve, which is located between the suction chamber (5) and the discharge chamber (6).

2. The anti-backflow safety gear lubrication pump according to claim 1, characterized in that: Corresponding positioning pin holes are provided on the pump body (1) and the rear cover (2), and the same positioning hollow pin (7) is inserted into the corresponding positioning pin holes of the pump body (1) and the rear cover (2); the screw (8) passes through the rear cover (2) and is screwed to the pump body (1), so that the pump body (1) and the rear cover (2) are fixedly connected.

3. The anti-backflow safety gear lubrication pump according to claim 1, characterized in that: Inside the pump body (1), there is a drive shaft (9) and a driven shaft (10) that are rotatably installed. The front and rear ends of the driven shaft (10) are rotatably connected to the inner walls of the pump body (1) and the rear cover (2), respectively. The drive gear (3) is fixedly sleeved on the outside of the drive shaft (9), and the driven gear (4) is fixedly sleeved on the outside of the driven shaft (10).

4. The anti-backflow safety gear lubrication pump according to claim 3, characterized in that: A front oil seal hole is provided on the pump body (1), and a rear oil seal hole is provided on the rear cover (2). The front end of the drive shaft (9) extends through the front oil seal hole to the outside of the pump body (1), and the rear end of the drive shaft (9) extends through the rear oil seal hole to the outside of the rear cover (2). An oil seal (11) is fixedly provided inside both the front and rear oil seal holes, and the oil seal (11) is sleeved on the outside of the drive shaft (9). An oblique hole is provided on both the pump body (1) and the rear cover (2). The oil seal (11) inside the front and rear oil seal holes is connected to the oil inlet through the oblique hole, so that the oil pressure at the bottom of the oil seal (11) is always kept low.

5. A gear lubrication pump with anti-backflow safety as described in claim 3, characterized in that: The outer opening of the suction chamber (5) is the oil inlet, and the outer opening of the discharge chamber (6) is the oil outlet. When the drive shaft (9) drives the drive gear (3) to rotate in the forward direction, the side where the drive gear (3) and the driven gear (4) are disengaged is the suction chamber (5) of the pump body (1), and the side where the drive gear (3) and the driven gear (4) are engaged is the discharge chamber (6). The closed space formed between the drive gear (3) and the driven gear (4) and the inner wall of the pump body (1) is the transition chamber (12). The suction chamber (5) is the low-pressure area, the discharge chamber (6) is the high-pressure area, and the transition chamber (12) is the pressure transition area between the high-pressure area and the low-pressure area.

6. A gear lubrication pump with anti-backflow safety as described in claim 1, characterized in that: A cylindrical inner hole is provided on the inner wall of the pump body (1) away from the rear cover (2), and the cylindrical inner hole is located inside the suction chamber (5); the anti-backflow valve is provided inside the cylindrical inner hole, and the anti-backflow valve includes a valve body (13), a valve seat (14), a valve pad (15), and a first spring (16); a first connecting groove (18) is also provided inside the pump body (1), one end of the first connecting groove (18) is connected to one end of the inner side of the cylindrical inner hole, and the other end of the first connecting groove (18) is connected to the discharge chamber (6).

7. A gear lubrication pump with anti-backflow safety as described in claim 6, characterized in that: The valve body (13) is formed by three primary cylinders, secondary cylinders and tertiary cylinders of different diameters, which are fixedly connected in sequence. The inner diameter of the primary cylinder is larger than that of the secondary cylinder, and the inner diameter of the secondary cylinder is larger than that of the tertiary cylinder. The primary cylinder, secondary cylinder and tertiary cylinder are all aligned with the axis of the cylindrical inner hole. The primary cylinder is fixedly set at the opening of the cylindrical inner hole, and the tertiary cylinder is located at one end of the inner side of the cylindrical inner hole. The tertiary cylinder is spaced apart from the inner end face of the cylindrical inner hole. The primary cylinder is connected to the suction chamber (5), and the end of the tertiary cylinder near the inner side of the cylindrical inner hole is kept open. The connecting ring of the secondary cylinder and the tertiary cylinder is provided with a connecting hole so that the inside of the secondary cylinder is connected to the inside of the cylindrical inner hole.

8. A gear lubrication pump with anti-backflow safety as described in claim 7, characterized in that: A valve seat (14) is fixedly installed inside the first-stage cylinder. Three oil passage holes (17) are provided on the valve seat (14). A circular plate-shaped valve pad (15) is provided inside the second-stage cylinder. A first spring (16) is fixedly installed inside the third-stage cylinder. One end of the first spring (16) is fixedly connected to the end of the third-stage cylinder away from the second-stage cylinder. The other end of the first spring (16) is fixedly connected to the valve pad (15). Under the action of the rebound force of the first spring (16), the valve pad (15) and the valve seat (14) are in close contact.

9. A gear lubrication pump with anti-backflow safety as described in claim 1, characterized in that: An installation hole is provided inside the rear cover (2), and the safety valve is provided inside the installation hole; the safety valve includes a safety valve body (19), a screw plug (20), and a second spring (21); a second connecting groove (22) and a third connecting groove (23) are provided inside the rear cover (2), one end of the second connecting groove (22) is connected to the discharge chamber (6), and the other end of the second connecting groove (22) is connected to the inner side of the installation hole; one end of the third connecting groove (23) is connected to the suction chamber (5), and the other end of the third connecting groove (23) is connected to the inner wall of the installation hole.

10. A gear lubrication pump with anti-backflow safety as described in claim 9, characterized in that: The safety valve body (19) is a cylindrical structure with one open end. The open end of the safety valve body (19) faces the outer opening of the mounting hole, and the outer wall of the safety valve body (19) maintains sliding contact with the inner wall of the mounting hole. The screw plug (20) is screwed into the outer opening of the mounting hole. A second spring (21) is provided inside the mounting hole. One end of the second spring (21) abuts against the inside of the safety valve body (19), and the other end of the second spring (21) abuts against the inside of the screw plug (20). Through the rebound force of the second spring (21), the safety valve body (19) is tightly abutted against the inner end of the mounting hole, and the second connecting groove (22) and the third connecting groove (23) are isolated by the safety valve body (19).

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