A self-priming gear pump with a seal

Abstract

The utility model relates to a gear pump with sealed self-suction, comprising a gear box, a driving shaft, a gear set and a sealing structure, the gear box is provided with a gear groove and an oil seal groove, the gear groove communicates with the oil seal groove, the driving shaft is placed in the gear groove and the oil seal groove, and the driving shaft is coaxial with the oil seal groove, the oil seal groove, the driving shaft, the driving gear, the oil seal, the first bearing and the second bearing are coaxially arranged, which can reduce the assembly error of the gear pump and improve the sealing performance of the gear pump, the first sealing protrusion of the gland is embedded in the first sealing groove of the driving gear to form radial sealing and reduce the entry of liquid into the oil seal groove, the oil seal sleeve is arranged on the driving shaft and coaxial with the driving shaft, the gland applies axial pressure to the oil seal, and the oil seal is tightly attached to the driving shaft and the bottom wall of the oil seal groove to block the entry of liquid into the oil seal groove and prevent the leakage of liquid from the oil seal groove to block the liquid leakage path.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, specifically to a gear pump with a sealed self-priming function for pumping water. Background Technology

[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 or pressurize liquids. It consists of two gears, a pump body, and front and rear covers forming two closed spaces. When the gears rotate, the volume of the space on the disengaged side of the gears increases from small to large, forming a vacuum that draws in the liquid. The volume of the space on the meshing side of the gears decreases from large to small, forcing the liquid into the pipeline.

[0003] Existing gear pumps are prone to leakage due to accumulated errors during assembly, which can affect their overall sealing performance. Utility Model Content

[0004] In view of the above problems, this application provides a gear pump with a sealed self-priming function for pumping water, so as to solve the problems of poor sealing and easy leakage caused by insufficient coaxiality and large cumulative assembly errors in existing pumping gear pumps.

[0005] To achieve the above objectives, the inventor provides a gear pump with a sealed self-priming function for pumping water, comprising a gearbox, a drive shaft, a gear set, and a sealing structure. The gearbox has a gear groove and an oil seal groove, the gear groove communicating with the oil seal groove. The drive shaft is placed in the gear groove and the oil seal groove, and is coaxial with the oil seal groove. The gear set is placed in the gear groove, and includes a drive gear and a driven gear. The drive gear meshes with the driven gear, and the drive gear is sleeved on one end of the drive shaft, following the drive shaft. The gear rotates and is coaxial with the oil seal groove. A first sealing groove is provided on one side of the gear relative to the oil seal groove. The sealing structure includes a pressure cap and an oil seal. The pressure cap is detachably disposed on the bottom wall of the gear groove and sleeved on the drive shaft. A first sealing protrusion coaxial with the oil seal groove is provided on the pressure cap. The first sealing protrusion is placed in the first sealing groove. The oil seal is placed in the oil seal groove and sleeved on the drive shaft. The oil seal is coaxial with the drive shaft, and the opposite sides of the oil seal are respectively connected to the pressure cap and the bottom wall of the oil seal groove.

[0006] Furthermore, the gearbox includes a housing and a cover. A second sealing groove is provided on the side of the housing away from the gear groove, and a second sealing protrusion is provided on the cover, with the second sealing protrusion placed in the second sealing groove.

[0007] Furthermore, it also includes a first bearing, a second bearing, and a motor output shaft. The first bearing is coaxial with the oil seal groove and sleeved on the drive shaft, and the opposite sides of the first bearing respectively abut against the bottom wall of the oil seal and the oil seal groove. The cover has a bearing hole on the side away from the housing. The second bearing is placed in the bearing hole and is coaxial with the oil seal groove. The end of the drive shaft away from the drive gear is placed in the shaft hole of the second bearing. One end of the motor output shaft is placed in the shaft hole of the second bearing and is connected to the drive shaft for transmission, so as to synchronously drive the drive shaft to rotate.

[0008] Furthermore, a transmission insert is provided at the end of the drive shaft away from the drive gear, and a transmission slot is provided at one end of the motor output shaft, with the transmission insert embedded in the transmission slot.

[0009] Furthermore, it also includes a retaining ring, on which an annular groove is provided, the retaining ring is sleeved on the bottom wall of the annular groove, the side wall of the retaining ring abuts against the side wall of the annular groove, and the retaining ring abuts against the side of the first bearing away from the pressure cap.

[0010] Furthermore, it also includes a driven shaft, which is disposed on the bottom wall of the gear groove and parallel to the driving shaft, and the driven gear is sleeved on the driven shaft.

[0011] Furthermore, screws are provided on the box body, and the box body is fixedly connected to the box cover by the screws.

[0012] Furthermore, it also includes a gearbox cover, which is provided with a plurality of stainless steel screws. The gearbox cover is fixed to the gearbox by the stainless steel screws to seal the gear slot.

[0013] Unlike existing technologies, the above technical solution has the following advantages: the gear groove and the oil seal groove are connected, and the drive shaft, drive gear and oil seal groove are coaxially arranged, ensuring that the central axes of each key component coincide, thereby reducing the accumulated error of assembly and improving the sealing performance; the first sealing protrusion of the gland is embedded in the first sealing groove of the drive gear to form a radial seal, reducing the amount of liquid entering the oil seal groove; at the same time, the oil seal is sleeved on the drive shaft and coaxial with the drive shaft, and the gland applies axial pressure to the oil seal, so that the oil seal fits tightly against the drive shaft and the first bearing, thereby blocking the liquid from entering the oil seal groove, preventing the liquid from leaking from the oil seal groove and blocking the liquid leakage path.

[0014] The above description of the utility model is merely an overview of the technical solution of this utility model. In order to enable those skilled in the art to better understand the technical solution of this utility model and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this utility model easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this utility model. Attached Figure Description

[0015] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the present invention and other related contents, and should not be considered as limitations on the present invention.

[0016] In the accompanying drawings of the instruction manual: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the gear groove and oil seal groove described in this embodiment; Figure 4 This is a schematic diagram showing the oil seal being mounted on the drive shaft as described in this embodiment; Figure 5 This is a schematic diagram of the first sealing groove and the first sealing protrusion in this embodiment; Figure 6 This is a schematic diagram of the retaining ring and annular groove described in this embodiment; Figure 7 This is a schematic diagram of the second sealing groove and the second sealing protrusion in this embodiment; Figure 8 This is a cross-sectional view of the present invention.

[0017] The reference numerals used in the above figures are explained as follows: 1. Gearbox; 11. Housing; 111. Gear groove; 112. Oil seal groove; 113. Second sealing groove; 114. Screw; 12. Cover; 121. Second sealing protrusion; 13. Gearbox cover; 131. Stainless steel screw; 2. Drive shaft; 21. Driven shaft; 22. First bearing; 23. Second bearing; 24. Motor output shaft; 25. Transmission insert; 26. Transmission slot; 27. Snap ring; 28. Annular snap groove; 29. ​​Bushing; 3. Gear set; 31. Drive gear; 311. First sealing groove; 32. Driven gear; 4. Sealing structure; 41. Pressure cap; 411. First sealing protrusion; 42. Oil seal; 5. Motor. Detailed Implementation

[0018] To illustrate in detail the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this utility model, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this utility model and are therefore intended to limit the scope of protection of this utility model.

[0019] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this utility model. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0020] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit the invention.

[0021] In the description of this utility model, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" logical relationship.

[0022] In this invention, terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy, or order between these entities or operations.

[0023] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this invention is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a series of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0024] In this utility model, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0025] In the description of the embodiments of this utility model, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the convenience of describing the specific embodiments of this utility model or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0026] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this utility model, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this utility model pertains, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0027] Please see Figures 1 to 8This embodiment provides a gear pump with a sealed self-priming function for pumping water, including a gearbox 1, a drive shaft 2, a gear set 3, and a sealing structure 4. The gearbox 1 is provided with a gear groove 111 and an oil seal groove 112, which communicate with each other. The drive shaft 2 is placed in the gear groove 111 and the oil seal groove 112, and is coaxial with the oil seal groove 112. The gear set 3 is placed in the gear groove 111, and includes a drive gear 31 and a driven gear 32. The drive gear 31 meshes with the driven gear 32. The drive gear 31 is sleeved on one end of the drive shaft 2, and rotates with the drive shaft 2. The drive gear 31 is coaxial with the oil seal groove 112. The drive gear 31 has a first sealing groove 311 on one side opposite to the oil seal groove 112. The sealing structure 4 includes a pressure cap 41 and an oil seal 42. The pressure cap 41 is detachably disposed on the bottom wall of the gear groove 111 and sleeved on the drive shaft 2. The pressure cap 41 has a first sealing protrusion 411 coaxial with the oil seal groove 112. The first sealing protrusion 411 is placed in the first sealing groove 311. The oil seal 42 is placed in the oil seal groove 112 and sleeved on the drive shaft 2. The oil seal 42 is coaxial with the drive shaft 2, and the opposite sides of the oil seal 42 are respectively connected to the pressure cap 41 and the bottom wall of the oil seal groove 112.

[0028] The gear groove 111 and the oil seal groove 112 are groove structures inside the gearbox 1. The gear groove 111 is used to house the driving gear 31 and the driven gear 32, and at the same time to contain the pumped liquid. The inner wall of the gear groove 111 is arc-shaped, which facilitates the flow of liquid, prevents the liquid from flowing turbulently in the gear groove 111, and ensures the efficient operation of the gear pump. The oil seal groove 112 is a regular cylindrical shape, horizontally positioned, with open ends that communicate with the gear groove 111. The oil seal 42 is cylindrical with a circular hole in the middle, which is coaxial with the oil seal groove 112. Screws are installed on the cover 41, and threaded holes are provided at corresponding positions on the bottom wall of the gear groove 111. The cover 41 is fixed to the bottom wall of the gear groove 111 by screws to seal the oil seal groove 112, thus initially improving the sealing performance of the gear pump. At the same time, a circular through hole is provided on the cover 41, which is coaxial with the oil seal groove 112 and the oil seal 42. The drive shaft 2 is a rod-shaped structure, horizontally positioned, and housed in the oil seal groove 112 and the gear groove 111. The outer diameter of the drive shaft 2 matches the diameter of the hole in the oil seal 42 and the diameter of the circular through hole on the cover 41. The drive shaft 2 passes through the oil seal 42 and the cover 41, and is coaxially positioned with the hole structure thereon.

[0029] The drive gear 31 is mounted on the drive shaft 2 and rotates synchronously with the drive shaft 2. Specifically, one outer wall of the drive shaft 2 connected to the drive gear 31 is a planar structure, while the other outer walls are arc-shaped. The shape of the hole structure on the drive gear 31 is adapted to the drive shaft 2. When the drive gear 31 is mounted on the drive shaft 2, the horizontal structure of one outer wall of the drive shaft 2 restricts the rotation of the drive shaft 2 relative to the drive gear 31, thereby synchronously driving the drive gear 31 to rotate. The first sealing groove 311, located on the side of the drive gear 31 opposite to the pressure cover 41, is a ring-shaped groove structure formed on the drive gear 31, coaxial with the drive gear 31, and communicating with the hole structure on the drive gear 31. The first sealing protrusion 411 is a ring-shaped protrusion structure on the pressure cover 41, coaxial with the circular through hole on the pressure cover 41. That is, the first sealing groove 311, the first sealing protrusion 411, the drive gear 31, the oil seal 42, the oil seal groove 112, and the drive shaft 2 are all coaxially arranged, which can reduce the assembly error of the gear pump and thus improve the sealing performance of the gear pump. The first sealing protrusion 411 is housed in the first sealing groove 311. When the liquid in the gear groove 111 penetrates into the hole structure on the drive gear 31, the liquid will flow into the first sealing groove 311 because the first sealing groove 311 is communicating with the hole structure. The first sealing protrusion 411 blocks the infiltrated liquid, reducing the liquid from entering the oil seal groove 112 and improving the sealing performance of the gear pump. Meanwhile, the outer diameter of the oil seal 42 is matched with the diameter of the oil seal groove 112, and the outer wall of the oil seal 42 is in close contact with the inner wall of the oil seal groove 112, thereby preventing liquid from seeping in from the gap between the two; the diameter of the circular hole on the oil seal 42 is matched with the outer diameter of the drive shaft 2, that is, the inner wall of the oil seal 42 is in close contact with the outer wall of the drive shaft 2, thereby preventing liquid from seeping in from the circular hole on the oil seal 42, further improving the sealing performance and preventing water leakage from the gear pump. Specifically, the gear groove 111 is connected to the oil seal groove 112, and the drive shaft 2, drive gear 31 and oil seal groove 112 are coaxially arranged to ensure that the central axes of each key component coincide and reduce radial offset; the first sealing protrusion 411 of the pressure cover 41 is embedded in the first sealing groove 311 of the drive gear 31 to form a radial seal and reduce the liquid entering the oil seal groove 112; at the same time, the oil seal 42 is sleeved on the drive shaft 2 and coaxial with the drive shaft 2, and the pressure cover 41 applies axial pressure to the oil seal 42 so that the oil seal 42 fits tightly against the drive shaft 2 and the bottom wall of the oil seal groove 112 to block the liquid entering the oil seal groove 112 and prevent the liquid from leaking from the oil seal groove 112, thereby blocking the liquid leakage path.

[0030] Please see Figure 7In this embodiment, the gearbox 1 includes a housing 11 and a cover 12. A second sealing groove 113 is provided on the side of the housing 11 away from the gear groove 111. A second sealing protrusion 121 is provided on the cover 12, and the second sealing protrusion 121 is placed in the second sealing groove 113.

[0031] The housing 11 is the main body of the gearbox 1, and both the gear groove 111 and the oil seal groove 112 are located in the housing 11. The second sealing groove 113 is an annular groove structure formed on the housing 11. The diameter of the second sealing groove 113 is larger than the diameter of the oil seal groove 112, and the second sealing groove 113 is coaxial with the oil seal groove 112. The second sealing protrusion 121 is an annular protrusion structure on the cover 12, and its diameter is adapted to the diameter of the second sealing groove 113. When the second sealing protrusion 121 is accommodated in the second sealing groove 113, the connecting surface between the housing 11 and the cover 12 forms a sealing surface, preventing liquid leakage from the gap between the housing 11 and the cover 12, thus improving the sealing performance. At the same time, compared with the existing integral structure of the gearbox 1, splitting the gearbox 1 into the housing 11 and the cover 12 facilitates the installation and maintenance of internal components.

[0032] Please see Figure 2 and Figure 4 In this embodiment, it also includes a first bearing 22, a second bearing 23 and a motor output shaft 24. The first bearing 22 is coaxial with the oil seal groove 112 and sleeved on the drive shaft 2, and the opposite sides of the first bearing 22 respectively abut against the oil seal 42 and the bottom wall of the oil seal groove 112. The cover 12 has a bearing hole on the side away from the housing 11. The second bearing 23 is placed in the bearing hole and is coaxial with the oil seal groove 112. The end of the drive shaft 2 away from the drive gear 31 is placed in the shaft hole of the second bearing 23. One end of the motor output shaft 24 is placed in the shaft hole of the second bearing 23 and is connected to the drive shaft 2 for transmission, so as to synchronously drive the drive shaft 2 to rotate.

[0033] The outer ring of the first bearing 22 is matched with the diameter of the oil seal groove 112. The outer wall of the first bearing 22 fits against the inner wall of the oil seal groove 112. At the same time, the opposite sides of the first bearing 22 abut against the oil seal 42 and the bottom wall of the oil seal groove 112. The oil seal 42 tightly abuts against the pressure cap 41. The pressure cap 41 is fixed to the bottom wall of the gear groove 111 by screws. This ensures that when the drive shaft 2 rotates, the oil seal 42 and the first bearing 22 sleeved on the drive shaft 2 will not move together, ensuring the sealing effect of the oil seal 42. This allows the first bearing 22 to stably support the drive shaft 2, reducing the frictional resistance of the drive shaft 2 during operation and ensuring rotational accuracy. When the cover 12 is placed on the housing 11, the bearing hole is connected to the oil seal groove 112. The second bearing 23 is placed in the bearing hole. The connection between the drive shaft 2 and the motor output shaft 24 is located in the shaft hole of the second bearing 23. The second bearing 23 then provides support for the motor output shaft 24.

[0034] Both the first bearing 22 and the second bearing 23 are coaxial with the oil seal groove 112, providing support for the drive shaft 2 and the motor output shaft 24, limiting the radial displacement of the drive shaft 2, and ensuring that the drive shaft 2 is always coaxial with the oil seal groove 112, the drive gear 31, and the oil seal 42; the first bearing 22 abuts against the oil seal 42, further applying axial pressure to the oil seal 42, enhancing the sealing effect of the oil seal 42; the motor output shaft 24 is connected to the drive shaft 2 through the second bearing 23, ensuring coaxiality with the drive shaft 2, and ensuring stable power transmission to the drive shaft 2.

[0035] Please see Figure 4 In this embodiment, a transmission insert 25 is provided at one end of the drive shaft 2 away from the drive gear 31, and a transmission slot 26 is provided at one end of the motor output shaft 24, with the transmission insert 25 embedded in the transmission slot 26.

[0036] The transmission insert 25 is a protruding structure at the end of the drive shaft 2. One of the opposite side walls of the transmission insert 25 is a planar structure, while the other opposite side wall is an arc-shaped structure. The transmission slot 26 is a groove structure at the end of the motor output shaft 24. One of the opposite sides of the transmission slot 26 is an open structure, while the inner walls of the other opposite sides are planar structures. When the transmission insert 25 is embedded in the transmission slot 26, the planar side walls of the transmission insert 25 are tightly abutted against the inner walls of the two sides of the transmission slot 26, so that the motor output shaft 24 can synchronously drive the drive shaft 2 to rotate, while there is no relative rotation between the drive shaft 2 and the motor output shaft 24. The transmission structure employing the interlocking transmission block 25 and the transmission slot 26 creates a circumferential limit on the connection surface between the drive shaft 2 and the motor output shaft 24, ensuring synchronous rotation of both. Simultaneously, the interlocking structure compensates for minor coaxiality deviations during installation, preventing jamming or slippage during power transmission. The transmission block 25 and the transmission slot 26 are detachable, facilitating the removal of the drive shaft 2 from the motor output shaft 24, thereby separating the gearbox 1 from the motor 5 and simplifying component inspection and maintenance.

[0037] Please see Figure 2 and Figure 6 In this embodiment, a retaining ring 27 is also included. An annular groove 28 is provided on the drive shaft 2. The retaining ring 27 is sleeved on the bottom wall of the annular groove 28. The side wall of the retaining ring 27 abuts against the side wall of the annular groove 28, and the retaining ring 27 abuts against the side of the first bearing 22 away from the pressure cover 41.

[0038] The annular groove 28 is an annular groove structure opened circumferentially on the drive shaft 2. The retaining ring 27 is roughly arc-shaped and is fitted into the annular groove 28. Part of its sidewall is tightly fitted with the sidewall of the annular groove 28 for fixation, while the other part abuts against the first bearing 22, thereby preventing the drive shaft 2 from moving due to vibration of the gear pump. This axially limits the drive shaft 2, restricting its movement towards the drive gear 31. At the same time, when the gear pump is operating, the drive shaft 2 applies an axial force to the retaining ring 27, which in turn applies an axial thrust to the first bearing 22 towards the pressure cap 41, ensuring that the first bearing 22 always abuts against the oil seal 42. The pressure is then transmitted to the oil seal 42 through the first bearing 22, ensuring that the oil seal 42 is always in a compressed state, preventing the oil seal 42 from loosening due to vibration of the gear pump, and continuously maintaining the sealing performance.

[0039] Please see Figure 1 and Figure 2 In this embodiment, a driven shaft 21 is also included. The driven shaft 21 is disposed on the bottom wall of the gear groove 111 and is parallel to the driving shaft 2. The driven gear 32 is sleeved on the driven shaft 21.

[0040] Driven shaft 21 is a shaft component that supports driven gear 32, providing stable support for the rotation of driven gear 32. Driven shaft 21 is located above and parallel to drive shaft 2, ensuring that the meshing surfaces of drive gear 31 and driven gear 32 are in uniform contact, avoiding uneven meshing clearance caused by shaft inclination. Drive gear 31 and driven gear 32 are evenly arranged in gear groove 111, and the clearance between them and gear groove 111 is the same. At the same time, water inlet and water outlet are provided on opposite sides of gearbox 1. The shafts of water inlet and water outlet are coaxial with the meshing box of drive gear 31 and driven gear 32, which facilitates liquid intake and discharge, improves the working efficiency of gear pump, and reduces operating noise.

[0041] Please see Figure 2 and Figure 4 In this embodiment, the housing 11 is provided with screws 114, and the housing 11 is fixedly connected to the cover 12 by the screws 114. The screws 114 pass through the corresponding mounting holes of the housing 11 and the cover 12, and the axial preload is generated by tightening the screws, so that the housing 11 and the cover 12 fit tightly, eliminating gaps, and ensuring a stable connection between the two. This prevents separation due to vibration during operation, and the detachable design facilitates later maintenance and component replacement, reducing operating costs.

[0042] Please see Figure 1 In this embodiment, a gearbox cover 13 is also included. The gearbox cover 13 is provided with a plurality of stainless steel screws 131. The gearbox cover 1 is fixed to the gearbox 1 by the stainless steel screws 131 to seal the gear groove 111. The gearbox cover 13 covers the opening of the gear groove 111 and is fixed by the plurality of stainless steel screws 131 evenly distributed, so that the connecting surface of the gearbox cover 13 and the gearbox 1 forms a uniform clamping force, ensuring that the gear groove 111 is sealed and preventing fluid from leaking from the opening of the gear groove 111, while protecting the internal gear set 3 from the influence of the external environment. Furthermore, a bushing 29 is sleeved on the end of the drive shaft 2, and a groove structure is provided on the gearbox cover 13. When the gearbox cover 13 closes the gearbox 1, the bushing 29 is accommodated in the groove structure on the gearbox cover 13 to further support the drive shaft 2.

[0043] In existing gear pumps, the drive gear 31 is mounted on the motor output shaft 24, and the motor output shaft 24 directly drives the drive gear 31 to rotate. The gearbox 1 is locked to the motor 5. This causes assembly errors to accumulate during the assembly of the gear pump, resulting in a large eccentricity between the oil seal 42 and the motor output shaft 24. During operation, the oil seal 42 is prone to fatigue damage and leakage. In this utility model, the gear groove 111 is connected to the oil seal groove 112, and the drive shaft 2, drive gear 31, and oil seal groove 112 are coaxially arranged, ensuring that the central axes of each key component coincide, thereby reducing accumulated assembly errors and improving sealing performance.

[0044] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this utility model, this should not limit the scope of patent protection of this utility model. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this utility model and utilizing the content described in the text and drawings of this utility model, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this utility model.

Claims

1. A gear pump with a sealed self-priming function for pumping water, characterized in that, include: A gearbox, wherein the gearbox is provided with a gear groove and an oil seal groove, and the gear groove and the oil seal groove are in communication; A drive shaft is placed in the gear groove and the oil seal groove, and the drive shaft is coaxial with the oil seal groove; A gear set, wherein the gear set is placed in the gear groove, the gear set includes a driving gear and a driven gear, the driving gear meshes with the driven gear, the driving gear is sleeved on one end of the driving shaft and rotates with the driving shaft, the driving gear is coaxial with the oil seal groove, and a first sealing groove is provided on the side of the driving gear opposite to the oil seal groove; A sealing structure includes a pressure cap and an oil seal. The pressure cap is detachably disposed on the bottom wall of the gear groove and sleeved on the drive shaft. The pressure cap is provided with a first sealing protrusion coaxial with the oil seal groove and is placed in the first sealing groove. The oil seal is placed in the oil seal groove and sleeved on the drive shaft. The oil seal is coaxial with the drive shaft, and the opposite sides of the oil seal are respectively connected to the pressure cap and the bottom wall of the oil seal groove.

2. A gear pump with sealed self-priming function for pumping water according to claim 1, characterized in that, The gearbox includes a housing and a cover. A second sealing groove is provided on the side of the housing away from the gear slot. A second sealing protrusion is provided on the cover, and the second sealing protrusion is placed in the second sealing groove.

3. A gear pump with a sealed self-priming function for pumping water according to claim 2, characterized in that, It also includes a first bearing, a second bearing, and a motor output shaft. The first bearing is coaxial with the oil seal groove and sleeved on the drive shaft, and the opposite sides of the first bearing respectively abut against the bottom wall of the oil seal and the oil seal groove. The cover has a bearing hole on the side away from the housing. The second bearing is placed in the bearing hole and is coaxial with the oil seal groove. The end of the drive shaft away from the drive gear is placed in the shaft hole of the second bearing. One end of the motor output shaft is placed in the shaft hole of the second bearing and is connected to the drive shaft for transmission, so as to synchronously drive the drive shaft to rotate.

4. A gear pump with a sealed self-priming function for pumping water according to claim 3, characterized in that, The drive shaft has a transmission insert at one end away from the drive gear, and the motor output shaft has a transmission slot at one end, with the transmission insert embedded in the transmission slot.

5. A gear pump with a sealed self-priming function for pumping water according to claim 3, characterized in that, It also includes a retaining ring, on which an annular groove is provided, the retaining ring is sleeved on the bottom wall of the annular groove, the side wall of the retaining ring abuts against the side wall of the annular groove, and the retaining ring abuts against the side of the first bearing away from the pressure cap.

6. A gear pump with a sealed self-priming function for pumping water according to claim 1, characterized in that, It also includes a driven shaft, which is disposed on the bottom wall of the gear groove and parallel to the driving shaft, and the driven gear is sleeved on the driven shaft.

7. A gear pump with a sealed self-priming function for pumping water according to claim 2, characterized in that, The box body is provided with screws, and the box body is fixedly connected to the box cover by the screws.

8. A gear pump with sealed self-priming function for pumping water according to claim 1, characterized in that, It also includes a gearbox cover, which is provided with a plurality of stainless steel screws. The gearbox cover is fixed to the gearbox by the stainless steel screws to seal the gear slot.

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