Gear pump

Abstract

The technical scheme belongs to the technical field of gear pumps, and particularly relates to a gear pump which comprises a pump cover, a pump seat and a gear assembly, the pump cover is detachably connected with the pump seat through a fixing bolt, the pump seat is provided with a pump cavity, the gear assembly comprises two gears, each gear comprises gear teeth and a gear shaft, the two gear teeth are meshed with each other and located in the pump cavity, and the gear shaft is located in the pump cavity. The pump cavity is provided with liquid passing openings in the two opposite sides of the gear tooth distribution position. The gear teeth and the gear shafts are coaxially arranged in a one-to-one correspondence mode, the gear shafts are provided with positioning protrusions, positioning grooves allowing the positioning protrusions to be embedded and positioned are formed in the inner walls of the gear teeth, the gear shafts drive the gear teeth to rotate to be used for pumping oil, the pump cover is detached from the pump base, so that the pump cavity of the pump base is opened, and then the gear assembly arranged in the pump cavity is exposed. When the positioning protrusions are separated from the positioning grooves, the gear teeth can be detached from the gear shaft, replacement and maintenance of the gear are facilitated, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present technical solution relates to the technical field of gear pumps, and in particular to a gear pump. Background Art

[0002] A gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to transport oil or increase its pressure. Conventional gear pumps are mainly composed of gears, a pump body, and front and rear covers.

[0003] For example, Chinese patent CN105889060A discloses a two-open axial clearance compensation high-pressure gear pump, which includes a front cover, a pump body, a pair of floating side plates, an E-type sealing ring, a driving gear, a driven gear, and a pair of sliding bearings. The two sliding bearings are respectively arranged in the middle of the driving gear and the driven gear, and the driving gear and the driven gear are meshed for transmission. The floating side plate and the E-type sealing ring are designed in a split type and are floatingly connected to the sliding bearing.

[0004] The above-mentioned two-open axial clearance compensation high-pressure gear pump, in which the gears are the main operating parts, continuously meshes and transmits during operation. Once the gears are worn, the entire gear needs to be replaced, resulting in a high actual use cost, which needs to be improved. Summary of the invention

[0005] In order to improve the problem of high overall replacement cost when the gears are worn, the present technical solution provides a gear pump.

[0006] The purpose of this technical solution is achieved in this way:

[0007] A gear pump, comprising a pump cover, a pump seat and a gear assembly, wherein the pump cover is detachably connected to the pump seat, the pump seat has a pump cavity, the gear assembly comprises two gears, each gear comprises gear teeth and a gear shaft, the two gear teeth are meshed with each other and are located in the pump cavity, and the pump cavity has liquid ports on opposite sides of the gear teeth distribution position;

[0008] Each of the gear teeth is coaxially arranged in a one-to-one correspondence with the gear shaft. The gear shaft is provided with a positioning protrusion, and the inner wall of the gear tooth is provided with a positioning groove for the positioning protrusion to be embedded and positioned. The gear shaft drives the gear teeth to rotate for pumping oil.

[0009] Through the above technical solution, when the gear pump is in normal use, the gear assembly is composed of two gears, and the gear shaft in the gear rotates under power drive, and the inner wall of the gear tooth is designed with a positioning groove that matches the positioning protrusion of the gear shaft. When the positioning protrusion is engaged with the positioning groove, one of the gear teeth is driven to rotate. Based on the mutual meshing of the gear teeth in the two gears and the parallel rotation axes, the other gear tooth is driven to rotate synchronously, and at this time, the oil can be driven to enter the pump cavity from the liquid outlet on one side and pushed to the liquid outlet on the other side for continuous pumping.

[0010] The pump cover is removed from the pump seat so that the pump chamber of the pump seat is opened, thereby exposing the gear assembly arranged in the pump chamber; when the positioning protrusion is disengaged from the positioning groove, the gear teeth can be detached from the gear shaft, which facilitates the replacement and maintenance of the gears and reduces the maintenance cost.

[0011] Preferably, the pump cover and the pump seat are provided with axial holes, the positions of the axial holes correspond one-to-one with the gear shafts, a shaft sleeve is provided in the pump cover, the shaft sleeve is arranged in the axial hole, and the shaft sleeve is used for the gear shaft to pass through to guide the gear shaft to rotate.

[0012] Through the above technical solution, after the pump seat and the pump cover are installed, the gear assembly is located between the two, and the pump cover and the pump seat are provided with matching axial holes at the positions of the gear shafts corresponding to each other. The two gear shafts can be correspondingly embedded in the axial holes to achieve positioning, thereby improving the positioning accuracy. Based on the axial holes of the pump cover, there are shaft sleeves, and one end of the gear shaft is correspondingly embedded in the shaft sleeve. The rotation of the gear shaft is supported by the shaft sleeve, thereby reducing rotational wear, thereby extending the service life of the gear shaft, improving the sealing performance, and improving the stability of gear meshing.

[0013] Preferably, the pump cover is provided with an installation groove, the installation groove is located on the end face of the pump cover facing away from the pump seat, the installation groove is arranged on the inner wall of the shaft hole, a sealing plug is installed in the installation groove, the sealing plug is fixed against the inner wall of the installation groove, the gear shaft extends through the shaft sleeve to be embedded in the sealing plug, the gear shaft rotates relative to the sealing plug, and the sealing plug is used to seal the gap between the gear shaft and the shaft sleeve.

[0014] Through the above technical scheme, one end of the gear shaft passes through the pump cover and extends to the side of the pump cover away from the pump seat, which is used for docking with the driving equipment to realize the rotation of the driving gear shaft. The installation groove corresponding to the penetration point of the pump cover is opened on the inner wall of the shaft hole. The sealing plug is made of elastic and wear-resistant material. It can be tightly pressed against the inner wall when embedded in the installation groove, and the position is relatively fixed. At this time, the gear shaft passes through the sealing plug, and the sealing plug is tightly attached to the outer wall of the gear shaft and avoids restricting the rotation of the gear shaft, thereby preventing the gap between the gear shaft and the sleeve from leaking oil to obtain effective sealing and improve the sealing effect.

[0015] Preferably, the pump cover is provided with a liquid guide hole, one end of the liquid guide hole penetrates to the outer peripheral wall of the pump cover, and the other end of the liquid guide hole penetrates into the shaft sleeve for the lubricating oil to flow in.

[0016] Through the above technical solution, one end of the liquid guide hole passes through the outer wall of the pump cover, which is convenient for the lubricating oil to flow in from the outside along the liquid guide hole, and the other end directly passes through the shaft sleeve to allow the lubricating oil to flow into the shaft sleeve for addition, thereby simplifying the lubricating oil addition process, ensuring the lubricating effect of the lubricating oil on the contact surface between the inner wall of the shaft sleeve and the gear shaft, reducing wear, and further extending the service life of the gear shaft.

[0017] Preferably, the pump seat is provided with a sinking groove, the sinking groove is arranged on the opposite side wall in the pump cavity, the bottom of the sinking groove is higher than the bottom of the pump cavity, and the two liquid ports are both opened at the bottom of the sinking groove.

[0018] Through the above technical scheme, the sinking groove is opened corresponding to the positions of the liquid outlets on both sides, ensuring that during the operation of the gear pump, the oil can enter the sinking groove and flow in or out smoothly from the two liquid outlets, thereby increasing the flow space and reducing the resistance to oil flow. The bottom of the sinking groove is higher than the bottom of the pump cavity, so that the inner wall of the pump cavity has a larger clamping surface and a larger contact area with the gear teeth, thereby increasing the stability and reliability of the gear pump.

[0019] Preferably, the pump cover is provided with a liquid flow channel, and the liquid flow channel is connected to the position of the sinking groove in a one-to-one correspondence. The inner wall of the liquid flow channel on the side away from the pump seat is also provided with an embedding groove, and a sealing ring is installed in the embedding groove. The sealing ring protrudes from the outer end surface of the pump cover, and the sealing ring is used for sealing during docking.

[0020] Through the above technical scheme, the position of the liquid flow channel of the pump cover corresponds one by one to the sinking groove, so that the two liquid ports can be connected to the liquid flow channel for use, and the sealing ring is embedded in the embedding groove on the side of the liquid flow channel away from the pump seat. The sealing ring protrudes from the outer end face of the pump cover, so that when it is docked with other equipment, the sealing ring can fit tightly between the contact surface of the corresponding equipment and the bottom of the embedding groove, thereby limiting the escape of oil from the docking point when flowing through the liquid flow channel, thereby enhancing the sealing performance.

[0021] Preferably, the positioning protrusion is in the shape of a ball, the positioning protrusion protrudes from the outer peripheral wall of the gear shaft, the gear shaft is provided with a limiting groove, and the positioning protrusion is embedded in the limiting groove.

[0022] Through the above technical solution, the limiting groove of the gear shaft is adapted to the positioning protrusion. Based on the fact that the positioning protrusion can be a ball, the positioning protrusion is embedded in the limiting groove and protrudes from the outer peripheral wall of the gear shaft. When the gear shaft passes through the gear teeth, the position of the positioning protrusion is aligned with the positioning groove of the gear teeth and embedded. At this time, the positioning protrusion is embedded in the positioning groove and the limiting groove at the same time, so that a tight connection is formed between the gear shaft and the gear teeth and the relative position is stable.

[0023] Preferably, the gear shaft is provided with a limiting ring, the gear shaft is provided with a ring groove for the limiting ring to be embedded, two limiting rings are provided, and the two limiting rings are located one-to-one on opposite sides of the gear teeth along the gear shaft to limit disengagement.

[0024] Through the above technical solution, after the fixed position between the gear shaft and the gear teeth is determined by the positioning protrusion, the two limit rings are aligned with the annular groove and embedded, and after deformation, they are tightly clamped to the bottom of the annular groove. The positions of the two limit rings are fixed and located on both sides of the gear teeth to achieve precise positioning of the gear teeth, limit the deviation and swing of the gear teeth due to centrifugal force during high-speed operation, and ensure the rotational stability of the gear teeth.

[0025] Preferably, the pump seat is provided with a countersunk hole, and the pump cover has a connecting hole. The position of the countersunk hole is connected to the connecting hole in a one-to-one correspondence. The pump cover is provided with a fixing bolt, and the countersunk hole is for the fixing bolt to pass through and is threadedly connected to the connecting hole. When the fixing bolt is unscrewed, the pump cover is separated from the pump seat to expose the pump chamber.

[0026] Through the above technical solution, the pump cover and the pump seat are close to each other so that the connecting hole of the pump seat is aligned with the countersunk hole of the pump seat and then connected. After the fixing bolts pass through the countersunk holes one by one, the bolt body of the fixing bolt is threadedly connected to the connecting hole so that the bolt head of the fixing bolt rests on the step surface of the countersunk hole, ensuring that the surface of the pump seat is flat, reducing obstructions caused by the protruding bolt head, and thereby improving the connection stability.

[0027] Preferably, the pump seat is further provided with a threaded hole, the threaded hole is located on the end surface of the pump seat facing away from the pump cover, and the threaded hole is used for threaded connection.

[0028] Through the above technical solution, a threaded hole is opened on the end face of the pump seat away from the pump cover, and a threaded structure is provided in the threaded hole, which facilitates the pump seat to be connected with other components through the threaded hole, thereby meeting different installation and fixing requirements.

[0029] Compared with the prior art, the technical solution has the following outstanding and beneficial technical effects:

[0030] 1. This technical solution consists of two gears in the gear assembly. When the positioning groove and the positioning protrusion are fitted, the gear shaft drives one of the gear teeth to rotate under the power drive, and then drives the other gear tooth to rotate synchronously. The oil is pumped along the two liquid ports and the pump cavity. The fixing bolts are loosened to remove the pump cover, and the positioning protrusion is separated from the positioning groove to remove the gear teeth, which is convenient for the replacement and maintenance of the gears and reduces the maintenance cost.

[0031] 2. This technical solution is to open an axial hole in the pump cover and the pump seat, and to provide a shaft sleeve in the axial hole. The two gear shafts can be correspondingly embedded in the shaft sleeves. The shaft sleeves support the rotation of the gear shafts, thereby reducing rotational wear, thereby extending the service life of the gear shafts and improving the stability of gear meshing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the overall structure of this embodiment;

[0033] Figure 2It is a partial explosion schematic diagram of this embodiment;

[0034] Figure 3 It is a partial cross-sectional schematic diagram of this embodiment;

[0035] Figure 4 A partial exploded schematic diagram of a gear assembly in an embodiment;

[0036] Figure 5 For this embodiment Figure 1 Schematic diagram from another perspective.

[0037] Figure numerals: 1. Pump cover; 2. Pump seat; 3. Gear assembly; 4. Fixing bolt; 5. Pump chamber; 6. Gear; 61. Gear tooth; 62. Gear shaft; 7. Liquid port; 9. Positioning protrusion; 10. Positioning groove; 11. Shaft hole; 12. Bushing; 13. Mounting groove; 14. Sealing plug; 15. Liquid guide hole; 16. Sinking groove; 17. Liquid flow channel; 18. Embedded groove; 19. Sealing ring; 20. Limiting groove; 21. Limiting ring; 22. Ring groove; 23. Countersunk hole; 24. Connecting hole; 25. Threaded hole. DETAILED DESCRIPTION

[0038] The specific implementation of the technical solution is further described in detail below with reference to the accompanying drawings.

[0039] Example:

[0040] See also Figure 1 and Figure 2 , a gear 6 pump comprises a pump cover 1, a pump seat 2 and a gear assembly 3. The pump cover 1 and the pump seat 2 are arranged relatively front and back in the horizontal direction. The pump cover 1 and the pump seat 2 are detachably connected. The specific detachable connection method is that the pump seat 2 is provided with a countersunk hole 23, and there are two countersunk holes 23. Each countersunk hole 23 penetrates along the thickness direction of the pump seat 2. The pump cover 1 has a connecting hole 24, and there are two connecting holes 24. The positions of the two connecting holes 24 correspond to the countersunk holes 23 one by one. The connecting hole 24 penetrates along the thickness direction of the pump cover 1 so as to be connected with the countersunk hole 23. The inner wall of the connecting hole 24 is threaded. The pump cover 1 is provided with a fixing bolt 4, and there are two fixing bolts 4. The two fixing bolts 4 pass through the two countersunk holes 23 one by one. After each fixing bolt 4 passes through the countersunk hole 23, the bolt body is threadedly connected to the corresponding connecting hole 24. Tighten the fixing bolt 4, and the bolt head of the fixing bolt 4 is tightly pressed against the step surface of the countersunk hole 23.

[0041] The gear assembly 3 is located between the pump cover 1 and the pump base 2. The gear assembly 3 includes two gears 6. The two gears 6 are vertically arranged up and down respectively. The rotation axes of the two gears 6 are parallel to each other. Each gear 6 includes a gear tooth 61 and a gear shaft 62. Each gear shaft 62 passes through the gear tooth 61 coaxially, and the two gear teeth 61 are meshed with each other. The pump base 2 has a pump cavity 5. The pump cavity 5 is located on the end surface of the pump base 2 close to the pump cover 1. The shape of the pump cavity 5 is adapted to the two gear teeth 61. The two gear teeth 61 are located in the pump cavity 5. When the fixing bolt 4 is unscrewed, the pump cover 1 is separated from the pump base 2 to expose the pump cavity 5.

[0042] The pump cover 1 and the pump base 2 are both provided with two axial holes 11, and the two axial holes 11 of the pump cover 1 correspond one-to-one with the two axial holes 11 of the pump base 2, and the two ends of the gear shaft 62 correspond one-to-one with the positions of the axial holes 11 on both sides, and the two ends of the gear shaft 62 are respectively aligned with the axial holes 11 on both sides and embedded, and the pump cover 1 is provided with two shaft sleeves 12, and the two shaft sleeves 12 are arranged one-to-one in the two axial holes 11 of the pump cover 1, and the channel cross-section of the shaft sleeve 12 is adapted to the cross-sectional size of the gear shaft 62, and one end of the gear shaft 62 is embedded in the shaft sleeve 12 to guide the gear shaft 62 to rotate.

[0043] The pump seat 2 is provided with a sinking groove 16, and there are two sinking grooves 16. The two sinking grooves 16 are both arranged on opposite side walls in the pump chamber 5, and the two sinking grooves 16 are located on both sides of the distribution of the gear teeth 61. The bottom of each sinking groove 16 is higher than the bottom of the pump chamber 5, so that the clamping surface of the inner wall of the pump chamber 5 on the gear teeth 61 is larger to improve stability. The pump chamber 5 has liquid passages 7 on opposite sides of the distribution position of the gear teeth 61. The positions of the two liquid passages 7 are connected to the two sinking grooves 16 in a one-to-one correspondence. The two liquid passages 7 are opened at the bottom of the sinking grooves 16. The pump cover 1 is provided with a liquid passage 17. There are two liquid passages 17. The two liquid passages 17 are connected to the positions of the two sinking grooves 16 in a one-to-one correspondence, so that the two liquid passages 17 are connected to the two liquid holes 7 respectively.

[0044] A groove 18 is also provided on the inner wall of each liquid flow channel 17 away from the pump seat 2. A sealing ring 19 is installed in each groove 18, and the sealing ring 19 protrudes from the corresponding outer end surface of the pump cover 1. When the liquid flow channel 17 is docked and used, the oil flows along the liquid flow channel 17, and the sealing ring 19 is used to improve the sealing performance of the docking point.

[0045] See also Figure 2 and Figure 3The pump cover 1 is provided with a mounting groove 13, and the mounting groove 13 is located on the end face of the pump cover 1 away from the pump seat 2. The mounting groove 13 is arranged on the inner wall of one of the shaft holes 11. A sealing plug 14 is installed in the mounting groove 13. The outer peripheral wall of the sealing plug 14 is tightly pressed against the inner peripheral side wall of the mounting groove 13. The position of the sealing plug 14 relative to the mounting groove 13 is fixed. In this example, the length of one of the gear shafts 62 is greater than that of the other gear shaft 62. One end of the gear shaft 62 passes through the shaft sleeve 12 and enters the mounting groove 13, and passes through the sealing plug 14 and extends to the outside of the pump cover 1. The sealing plug 14 is used to seal the gap between the gear shaft 62 and the shaft sleeve 12. The gear shaft 62 rotates relative to the sealing plug 14. The rotation of the gear shaft 62 drives the gear teeth 61 to rotate. The rotation of the gear teeth 61 drives the other gear teeth 61 to rotate synchronously for pumping oil.

[0046] The pump cover 1 is provided with a liquid guide hole 15, and there are two liquid guide holes 15. The two liquid guide holes 15 correspond one to one with the two shaft sleeves 12 of the pump cover 1. One end of the two liquid guide holes 15 respectively penetrates the end surfaces of the pump cover 1 on both sides of the upper and lower sides in the vertical direction, and the other ends of the two liquid guide holes 15 penetrate into the corresponding shaft sleeves 12. The two liquid guide holes 15 are used for lubricating oil to flow in so as to improve the rotation smoothness of the contact between the gear shaft 62 and the shaft sleeve 12.

[0047] See also Figure 4 The gear shaft 62 is provided with a positioning protrusion 9. In this example, the positioning protrusion 9 is in the shape of a ball. A limiting groove 20 is provided on the outer peripheral wall of the gear shaft 62. The limiting groove 20 is matched with the positioning protrusion 9. The positioning protrusion 9 is embedded in the limiting groove 20. The positioning protrusion 9 protrudes relative to the outer peripheral wall of the gear shaft 62. A positioning groove 10 is provided on the inner wall of the gear tooth 61. The positioning groove 10 penetrates along the direction in which the gear shaft 62 passes through the gear tooth 61. When the gear shaft 62 is embedded in the gear tooth 61, the positioning protrusion 9 is aligned with the positioning groove 10, and the positioning protrusion 9 is embedded in the positioning groove 10. The notches of the positioning groove 10 and the limiting groove 20 are relative to each other, so that the positioning protrusion 9 is simultaneously embedded in the positioning groove 10 and the limiting groove 20 for positioning, thereby realizing that the rotation of the gear shaft 62 drives the gear tooth 61 to rotate synchronously.

[0048] The gear shaft 62 is provided with a limit ring 21, and there are two limit rings 21. The gear shaft 62 is provided with an annular groove 22 adapted to the limit ring 21. The two annular grooves 22 correspond one to one with the two limit rings 21. The two annular grooves 22 are respectively located on opposite sides of the gear teeth 61, so that after the two limit rings 21 are embedded in the two annular grooves 22 and fixed, the gear teeth 61 are located between the two limit rings 21 to achieve position positioning.

[0049] See also Figure 5The pump seat 2 is also provided with a threaded hole 25, and there are two threaded holes 25. The inner walls of the two threaded holes 25 are both threaded. The two threaded holes 25 are both located on the end surface of the pump seat 2 away from the pump cover 1. The threaded holes 25 are used for threaded connection during installation.

[0050] The specific working process of this program is as follows:

[0051] The technical solution is that the gear assembly 3 is composed of two gears 6, each gear 6 includes a gear tooth 61 and a gear shaft 62, and the positioning installation between the gear shaft 62 and the gear tooth 61 is achieved by embedding a positioning protrusion 9 in the limiting groove 20, and the positioning protrusion 9 is embedded in the positioning groove 10 on the inner wall of the gear tooth 61, one of the gear shafts 62 drives the gear tooth 61 to rotate, thereby driving the other gear tooth 61 to rotate synchronously, and the pump cover 1 is removed from the pump seat 2 by loosening the fixing bolts 4, so that the pump chamber 5 of the pump seat 2 is opened, thereby exposing the gear assembly 3 arranged in the pump chamber 5, and after the positioning protrusion 9 is disengaged from the positioning groove 10, the gear tooth 61 can be detached from the gear shaft 62, which is convenient for replacement and maintenance of the gear 6 and reduces maintenance costs.

[0052] The above shows and describes the basic principle and main features of the technical solution and the advantages of the technical solution. The technicians in this industry should understand that the technical solution is not limited by the above embodiments. The above embodiments and the description only illustrate the principle of the technical solution. Without departing from the spirit and scope of the technical solution, the technical solution will have various changes and improvements, which fall within the scope of the technical solution to be protected. The scope of protection claimed by the technical solution is defined by the attached claims and their equivalents.

Claims

1. A gear pump, comprising a pump cover (1), a pump seat (2) and a gear assembly (3), characterized in that: The pump cover (1) is detachably connected to the pump base (2), the pump base (2) has a pump chamber (5), the gear assembly (3) comprises two gears (6), each gear (6) comprises a gear tooth (61) and a gear shaft (62), the two gear teeth (61) are meshed with each other and are located in the pump chamber (5), and the pump chamber (5) has liquid outlets (7) on opposite sides of the distribution position of the gear teeth (61); Each of the gear teeth (61) is coaxially arranged in one-to-one correspondence with the gear shaft (62); the gear shaft (62) is provided with a positioning protrusion (9); the inner wall of the gear tooth (61) is provided with a positioning groove (10) for the positioning protrusion (9) to be embedded and positioned; the gear shaft (62) drives the gear teeth (61) to rotate for pumping oil.

2. The gear pump according to claim 1, characterized in that: The pump cover (1) and the pump seat (2) are provided with an axial hole (11), the position of the axial hole (11) corresponds one-to-one with the gear shaft (62), and a shaft sleeve (12) is provided in the pump cover (1), and the shaft sleeve (12) is arranged in the axial hole (11), and the shaft sleeve (12) allows the gear shaft (62) to pass through and is used to guide the gear shaft (62) to rotate.

3. The gear pump according to claim 2, characterized in that: The pump cover (1) is provided with a mounting groove (13), and the mounting groove (13) is located on the end surface of the pump cover (1) facing away from the pump seat (2). The mounting groove (13) is arranged on the inner wall of the shaft hole (11). A sealing plug (14) is installed in the mounting groove (13), and the sealing plug (14) is fixed against the inner peripheral wall of the mounting groove (13). The gear shaft (62) passes through the shaft sleeve (12) and extends to be embedded in the sealing plug (14). The gear shaft (62) rotates relative to the sealing plug (14), and the sealing plug (14) is used to seal the gap between the gear shaft (62) and the shaft sleeve (12).

4. The gear pump according to claim 2, characterized in that: The pump cover (1) is provided with a liquid guide hole (15), one end of the liquid guide hole (15) penetrates the outer peripheral wall of the pump cover (1), and the other end of the liquid guide hole (15) penetrates into the shaft sleeve (12) for the lubricating oil to flow in.

5. The gear pump according to claim 1, characterized in that: The pump seat (2) is provided with a sinking groove (16), and the sinking groove (16) is arranged on the opposite side walls in the pump cavity (5). The bottom of the sinking groove (16) is higher than the bottom of the pump cavity (5), and the two liquid ports (7) are both provided at the bottom of the sinking groove (16).

6. The gear pump according to claim 5, characterized in that: The pump cover (1) is provided with a liquid flow channel (17), and the liquid flow channel (17) is connected to the position of the sinking groove (16) in a one-to-one correspondence. The inner wall of the liquid flow channel (17) on the side away from the pump seat (2) is also provided with an embedding groove (18), and a sealing ring (19) is installed in the embedding groove (18). The sealing ring (19) protrudes from the outer end surface of the pump cover (1), and the sealing ring (19) is used for sealing during docking.

7. The gear pump according to claim 1, characterized in that: The positioning protrusion (9) is in the shape of a ball, and the positioning protrusion (9) protrudes from the outer peripheral wall of the gear shaft (62). The gear shaft (62) is provided with a limiting groove (20), and the positioning protrusion (9) is embedded in the limiting groove (20).

8. The gear pump according to claim 1, characterized in that: The gear shaft (62) is provided with a limiting ring (21), and the gear shaft (62) is provided with an annular groove (22) for the limiting ring (21) to be embedded in. Two limiting rings (21) are provided, and the two limiting rings (21) are located one-to-one on opposite sides of the gear teeth (61) along the gear shaft (62) to limit disengagement.

9. The gear pump according to claim 1, characterized in that: The pump seat (2) is provided with a countersunk hole (23), the pump cover (1) has a connecting hole (24), the pump cover (1) is provided with a fixing bolt (4), the position of the countersunk hole (23) is connected to the connecting hole (24) in a one-to-one correspondence, the countersunk hole (23) is for the fixing bolt (4) to pass through and is threadedly connected to the connecting hole (24), when the fixing bolt (4) is unscrewed, the pump cover (1) is separated from the pump seat (2) to expose the pump chamber (5).

10. The gear pump according to claim 1, characterized in that: The pump seat (2) is also provided with a threaded hole (25), the threaded hole (25) being located on the end surface of the pump seat (2) facing away from the pump cover (1), and the threaded hole (25) being used for threaded connection.

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