Sealing structure, and gear pump having improved sealing performance and having lubrication structure

Abstract

Disclosed in the present invention is a gear pump having improved sealing performance, which comprises a pump housing, a driving assembly, a motor assembly and a sealing assembly. The pump housing is provided with a containing cavity, and a liquid inlet channel, a liquid outlet channel and a shaft hole which are communicated with the containing cavity. The driving assembly is provided in the containing cavity and is used for driving a liquid to flow into the containing cavity through the liquid inlet channel and flow out of the liquid outlet channel. The motor assembly comprises an end cover and a motor shaft extending out of the end cover, the motor shaft extending into the containing cavity through the shaft hole and being in transmission connection with the driving assembly. The sealing assembly comprises a sealing member and an elastic member, the sealing member being provided around the circumference of the motor shaft and being used for blocking the shaft hole, and the elastic member elastically supporting the sealing member to limit the sealing member. The present invention uses the elastic member to limit the sealing member and absorb vibration generated by the motor during working, so that the adverse effect of the vibration of the motor on the sealing member is reduced, thereby reducing instances of loosening of sealing rings and sealing failure, and prolonging the service life of a pump body.

Description

Gear pump with improved sealing structure and sealing performance and lubrication structure Technical Field

[0001] The present invention relates to the technical field of pump body sealing, and in particular to a gear pump with a sealing structure and improved sealing performance and a lubrication structure. Background Art

[0002] During operation, a pump primarily pumps fluid through changes in the volume of its inlet and outlet chambers. Specifically, a motor shaft drives the movement of a drive assembly within the chamber to achieve fluid flow. For example, in a gear pump, the motor shaft drives the gears, while in a vane pump, the motor shaft drives the impeller. The motor shaft typically extends into the chamber through a shaft hole in the pump casing.

[0003] In the prior art, a sealing ring can be installed outside the motor shaft to seal the shaft hole. However, the vibration generated by the motor during operation is inevitably transmitted to the sealing ring, which often causes the sealing ring to loosen and the seal to fail after the pump body is used for a long time, thereby affecting the service life of the pump body. Summary of the Invention

[0004] The main purpose of the present invention is to provide a gear pump with improved sealing performance, aiming to solve the problem in traditional technology that the pump body is prone to sealing failure due to vibration after long-term use.

[0005] To achieve the above-mentioned object, the present invention provides a pump housing having a cavity, wherein the pump housing has a liquid inlet channel, a liquid outlet channel and an axial hole communicating with the cavity;

[0006] a driving assembly, disposed in the cavity, for driving the liquid to flow from the liquid inlet channel into the cavity and out of the liquid outlet channel;

[0007] a motor assembly, comprising an end cover and a motor shaft extending from the end cover, wherein the motor shaft extends from the shaft hole into the cavity and is in driving connection with the drive assembly; and

[0008] The sealing assembly includes a sealing member and an elastic member. The sealing member is arranged on the outer periphery of the motor shaft and is used to seal the shaft hole. The elastic member elastically supports the sealing member to limit the position of the sealing member.

[0009] In one embodiment, the pump casing has a shell plate facing the end cover, the axial hole is opened on the shell plate, and the elastic member includes a compression spring extending in the axial direction, one end of the compression spring elastically abuts against the sealing member, and the other end is connected to the motor assembly.

[0010] In one embodiment, the sealing member includes a sleeve, a first sealing ring and a second sealing ring. The sleeve is sleeved on the outer periphery of the motor shaft and has a first end close to the shell plate and a second end close to the end cover. A sealed cavity is defined between the inner periphery of the sleeve and the outer periphery of the motor shaft. The sealed cavity is connected to the accommodating cavity. The first sealing ring is arranged between the first end and the shell plate, and the second sealing ring is arranged between the second end and the motor shaft. The first sealing ring and the second sealing ring are used to jointly seal the sealed cavity.

[0011] In one embodiment, the side of the shell plate facing the end cover has a sealing groove arranged around the outer periphery of the axial hole, the first end is provided with an annular step inserted into the sealing groove, the first sealing ring is sleeved on the outer periphery of the annular step and abuts the bottom wall and side wall of the sealing groove.

[0012] In one embodiment, the sleeve is open at the second end, and the second sealing ring is disposed in the sealing cavity and sandwiched between the inner side wall of the sealing cavity and the outer periphery of the motor shaft.

[0013] In one embodiment, a bearing is provided on the end cover, the motor shaft extends from the bearing, the bearing is partially inserted into the opening, and the second sealing ring abuts against the bearing on a side facing away from the sealing cavity.

[0014] In one embodiment, a gasket is provided on the end side of the bearing facing the shell plate, and the second sealing ring is pressed against the gasket.

[0015] In one embodiment, a first limiting groove is provided on the outer peripheral side of the bearing, and a second limiting groove is provided on the peripheral side of the sleeve. The first limiting groove and the second limiting groove extend axially respectively, and the sealing assembly also includes a limiting column inserted in the first limiting groove and the second limiting groove.

[0016] In one embodiment, the outer circumference of the sleeve is provided with a bearing surface facing the end cover, one end of the compression spring abuts against the bearing surface, and the other end abuts against the motor assembly.

[0017] In one embodiment, a bearing is provided on the end cover, and the bearing has an open groove facing the shell plate. The open groove is arranged around the outer periphery of the motor shaft, and the compression spring abuts against one end of the motor assembly and is inserted into the open groove and abuts against the bottom of the open groove.

[0018] In one embodiment, a third sealing ring is further sleeved on the motor shaft, and the third sealing ring is sandwiched between the inner periphery of the shaft hole and the outer periphery of the motor shaft.

[0019] In one embodiment, the elastic member further includes a retaining spring, which is arranged in a ring shape extending along the circumferential direction and having a gap. The retaining spring is sleeved on the outer circumference of the sleeve and connected to the motor assembly.

[0020] In one embodiment, the motor assembly further includes a wall portion arranged between the shell plate and the end cover, the wall portion being arranged around the outer periphery of the seal and connected to the end cover, the inner periphery of the wall portion being recessed with a mounting groove extending circumferentially, and the outer periphery of the retaining spring being embedded in the mounting groove.

[0021] In one embodiment, the drive assembly includes a driving gear and a driven gear that mesh with each other, the motor shaft is key-connected to the driving gear, and the driving gear and the driven gear divide the cavity into a liquid inlet cavity adjacent to the liquid inlet channel and a liquid outlet cavity adjacent to the liquid outlet channel.

[0022] In the technical solution provided by the present invention, a seal is sleeved on the motor shaft of the pump body to seal the shaft hole, and the seal is elastically supported by an elastic member to achieve positional restraint. This not only ensures the seal's reliable positional restraint by the elastic member, but also facilitates assembly and disassembly of the seal assembly. Furthermore, the elastic member absorbs vibration energy generated by the motor during operation, reducing the adverse effects of motor vibration on the seal, reducing the risk of seal ring loosening and seal failure, and thus extending the service life of the pump body.

[0023] In the technical solution provided by the present invention, the sealing structure includes a third sealing ring and a sealing member, which has a double sealing function. The third sealing ring is arranged on the outer periphery of the motor shaft and is clamped between the inner periphery of the shaft hole and the outer periphery of the motor shaft. The sealing member is arranged on the side of the third sealing ring facing away from the pump casing and has a sealing cavity. When the sealing of the third sealing ring fails, the sealing cavity is connected to the plenum cavity to achieve the purpose of double sealing, thereby improving the sealing performance of the sealing structure and extending the service life of the pump body.

[0024] In the technical solution provided by the present invention, a liquid guide groove is provided on the inner wall of the cavity facing the end side of the driving gear and the driven gear. The liquid guide groove guides the liquid from the meshing gap between the driving gear and the driven gear for transmitting the liquid into the gap between the end side of the driving gear and the driven gear and the inner wall. The liquid in the gap plays a lubricating role, reduces the friction resistance between the inner wall and the driving gear and the driven gear, reduces the wear of the driving gear and the driven gear during operation, thereby improving the working efficiency and service life of the gear pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] FIG1 is a perspective schematic diagram of an embodiment of a gear pump with improved sealing performance provided by the present invention;

[0027] Figure 2 is a front view of the pump body in Figure 1;

[0028] FIG3 is a cross-sectional view of the pump body in FIG2 ;

[0029] FIG4 is an enlarged schematic diagram of point A in FIG3 ;

[0030] FIG5 is a schematic diagram of the exploded three-dimensional structure of the pump body in FIG1 ;

[0031] FIG6 is a schematic diagram of the three-dimensional structure of an embodiment of the sealing structure in FIG5 ;

[0032] FIG. 7 is a schematic diagram of a three-dimensional exploded structure of the sealing structure in FIG. 6 .

[0033] FIG8 is a cross-sectional view of the gear pump in FIG1 ;

[0034] FIG9 is a schematic diagram of the exploded perspective structure of the gear pump in FIG1 ;

[0035] FIG10 is a schematic diagram of the three-dimensional structure of the housing in FIG9 ;

[0036] FIG11 is a schematic diagram of the three-dimensional structure of the cover body and the mounting base in FIG9 .

[0037] Description of Figure Numbers:

[0038] 1- pump body; 10- pump casing; 110- cavity; 111- shaft hole; 11- shell plate; 12- sealing groove; 20- driving assembly; 21- driving gear; 22- driven gear; 30- motor assembly; 31- motor shaft; 32- end cover; 33- bearing; 331- gasket; 40- sealing assembly; 41- sealing member; 410- sealing chamber; 411- sleeve; 4111- first end; 4112- second end; 4113- annular step; 4114- bearing surface; 412- first sealing ring; 413- second sealing ring; 42- elastic member; 421- compression spring; 422- retaining spring; 43- limiting column; 431- first limiting groove; 432- second limiting groove; 50- wall portion; 51- mounting groove.

[0039] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] Please refer to Figures 1 to 3. The present invention discloses a pump body 1, specifically providing a gear pump with improved sealing performance. Specifically, the pump body 1 includes a pump casing 10, a drive assembly 20, a motor assembly 30 and a sealing assembly 40. The shape and material of the pump casing 10 are not limited, and it has a cavity 110. The pump casing 10 has a liquid inlet channel 101, a liquid outlet channel 102 and an axial hole 111 connected to the cavity 110. The drive assembly 20 is arranged in the pump casing 10, and is used to drive the liquid to flow from the liquid inlet channel into the cavity 110 and out from the liquid outlet channel. The specific structure of the drive assembly 20 can be set according to the type of the pump body 1, for example, it can include two gears that mesh with each other or an outer gear ring and an inner gear that mesh with each other.

[0044] In this embodiment, the drive assembly 20 is driven by the motor assembly 30. Specifically, the motor assembly 30 includes an end cap 32 and a motor shaft 31 extending from the end cap 32. The motor shaft 31 extends through the shaft hole 111 into the chamber 110 and is in driving connection with the drive assembly 20, thereby enabling the drive assembly 20 to flow liquid and achieve the purpose of pumping liquid. In one embodiment, the drive assembly 20 includes an impeller, and the motor shaft 31 is drivingly connected to the impeller to drive the impeller to rotate.

[0045] In another embodiment, please continue to refer to Figure 3. The drive assembly 20 includes a driving gear 21 and a driven gear 22 that mesh with each other. The motor shaft 31 is keyed to the driving gear 21. The driving gear 21 and the driven gear 22 separate the chamber 110 into a liquid inlet chamber adjacent to the liquid inlet channel and a liquid outlet chamber adjacent to the liquid outlet channel. When the motor shaft 31 rotates, it drives the driving gear 21 and the driven gear 22 to rotate, the volume of the liquid inlet chamber decreases, and liquid is sucked from the liquid inlet channel. The volume of the liquid outlet chamber increases, and liquid is discharged to the liquid outlet channel. In this embodiment, the pump body 1 is a gear pump, which has the advantages of simple structure and stable operation.

[0046] Further, please continue to refer to Figures 3 and 4. The sealing assembly 40 includes a sealing member 41 and an elastic member 42. The sealing member 41 is arranged around the outer periphery of the motor shaft 31. Its structure can be various, as long as it can be used to seal the shaft hole 111. The elastic member 42 elastically supports the sealing member 41 to limit the position of the sealing member 41. The type of the elastic member 42 is not limited. For example, it can be a compression spring 421, a coil spring or an elastic rubber pad. Preferably, the elastic member 42 has a structure that can stably support the sealing member 41 without hindering the rotation of the motor shaft 31. The elastic member 42 can elastically support the sealing member 41 in the axial direction to absorb the axial vibration of the motor shaft 31. The elastic member 42 can also elastically support the sealing member 41 in the radial direction to absorb the radial vibration of the motor shaft 31. In this embodiment, on the one hand, the elastic member 42 is used to achieve reliable positioning of the seal 41, while making the sealing assembly 40 easy to disassemble and assemble. On the other hand, the elastic member 42 can also absorb the vibration energy generated by the motor during operation, thereby reducing the adverse effects of the motor vibration on the seal 41, reducing the loosening of the sealing ring and the failure of the seal, and thus extending the service life of the pump body 1.

[0047] Specifically, in one embodiment, referring to Figures 4 to 7, the pump housing 10 has a shell plate 11 facing the end cover 32, and the axial hole 111 is provided on the shell plate 11. The shell plate 11 can be integrally formed on the pump body 1, or assembled on the pump housing 10, as long as the sealing of the cavity 110 can be maintained. The integral molding of the pump housing 10 can make the cavity 110 have good sealing performance, and the assembly of the pump housing 10 to the cavity 110 can facilitate the installation of the drive assembly 20 inside the cavity 110. In this embodiment, the shell plate 11 is a part of the pump housing 10 and is provided with an axial hole 111. The end cover 32 of the motor assembly 30 is spaced apart from the shell plate 11 in the axial direction, and the motor shaft 31 extends from the end cover 32, passes through the sealing assembly 40, and then passes through the axial hole 111 and extends into the cavity 110.

[0048] The elastic member 42 includes a compression spring 421 extending in the axial direction, one end of the compression spring 421 elastically abuts against the seal 41, and the other end is connected to the motor assembly 30. In this way, the compression spring 421 elastically presses the seal 41 against the shaft hole 111 in the direction extending from the end cover 32 to the shell plate 11 to achieve a sealing effect. In this embodiment, when installing the pump body 1, the compression spring 421 and the seal 41 can be first sleeved one by one on the outer periphery of the motor shaft 31, and then the pump housing 10 can be installed, which is easy to operate. After installation, the elastic pressure of the compression spring 421 reliably presses the seal 41 against the shaft hole 111 to achieve sealing of the shaft hole 111. When the pump body 1 is working, the compression spring 421 can well absorb the axial vibration of the motor assembly 30 when it is working, reduce the shaking effect of the vibration of the motor assembly 30 on the seal 41, reduce the probability of the seal 41 loosening due to vibration, improve the sealing performance of the sealing assembly 40, and extend the service life of the pump body 1.

[0049] Based on the previous embodiment, the sealing member 41 can be directly configured as a sealing ring, which is accommodated in the shaft hole 111 and directly abuts against the compression spring 421. In this way, the sealing ring is movable in the axial direction. Although the structure is simple, once it is loosened from the shaft hole 111, leakage will occur.

[0050] To this end, in a preferred embodiment, the sealing member 41 includes a sleeve 411, a first sealing ring 412 and a second sealing ring 413. The sleeve 411 is sleeved on the outer periphery of the motor shaft 31 and has a first end 4111 close to the shell plate 11 and a second end 4112 close to the end cover 32. A sealed cavity 410 is defined between the inner periphery of the sleeve 411 and the outer periphery of the motor shaft 31. The sealed cavity 410 is connected to the accommodating cavity 110. The first sealing ring 412 is arranged between the first end 4111 and the shell plate 11, and the second sealing ring 413 is arranged between the second end 4112 and the motor shaft 31. The first sealing ring 412 and the second sealing ring 4 are used to jointly seal the sealed cavity 410. In this embodiment, sleeve 411 and compression spring 421 are in direct contact, forming a sealed cavity 410 communicating with chamber 110. A first sealing ring 412 and a second sealing ring 413 are provided at either axial end of sleeve 411 to seal sealed cavity 410 from both ends, achieving a strong seal. This arrangement prevents direct contact between compression spring 421 and the sealing ring, which could cause axial displacement and deformation of the sealing ring and lead to sealing failure.

[0051] Based on the previous embodiment, referring to Figures 4 to 7 , the side of the shell plate 11 facing the end cap 32 has a sealing groove 12 circumferentially disposed on the outer periphery of the axial hole 111. The first end 4111 is provided with an annular step 4113 inserted into the sealing groove 12. The first sealing ring 412 is sleeved around the outer periphery of the annular step 4113 and abuts the bottom wall and side walls of the sealing groove 12. In this way, the first sealing ring 412 is axially limited by the sleeve 411 and is less likely to move or deform axially. Furthermore, the first sealing ring 412 seals on both the inner and outer peripheries, as well as the upper and lower sides, in the radial direction, resulting in a larger sealing contact surface and a better sealing effect. When the hydraulic pressure in the sealing chamber 410 increases, the first sealing ring 412 is pressed more tightly against the shell plate 11, enhancing the sealing effect and improving the sealing performance of the sealing assembly 40.

[0052] In one embodiment, please continue to refer to Figure 4, the sleeve 411 is open at the second end 4112, and the second sealing ring 413 is arranged in the sealing cavity 410, and is clamped between the inner wall of the sealing cavity 410 and the outer periphery of the motor shaft 31. In this embodiment, the sleeve 411 plays a role in tightening the second sealing ring 413, thereby enhancing the sealing performance of the second sealing ring 413. Preferably, the material of the sleeve 411 is a material with a certain elasticity such as rubber, silicone, etc., so that it plays a role in increasing the friction resistance to the second sealing ring 413 and reducing the rotation of the second sealing ring 413 with the motor shaft 31. Preferably, the material of the sleeve 411 can be a material with good thermal conductivity such as graphite or metal, so as to reduce the friction temperature rise of the second sealing ring 413 when the motor shaft 31 rotates, thereby improving the service life of the second sealing ring 413.

[0053] Further, referring to Figures 4 to 7 , a bearing 33 is provided on the end cap 32 , from which the motor shaft 31 extends. The bearing 33 is partially inserted into the opening, and the second sealing ring 413 abuts against the bearing 33 on the side facing away from the sealed cavity 410 . In this embodiment, the end of the bearing 33 facing the shell plate 11 axially supports the second sealing ring 413 , thereby limiting the axial position of the second sealing ring 413 . Furthermore, when the hydraulic pressure within the sealed cavity 410 increases, the second sealing ring 413 can be pressed more tightly against the bearing 33 , further enhancing the sealing performance of the second sealing ring 413 by utilizing the hydraulic pressure.

[0054] Optionally, a gasket 331 is provided on the end of the bearing 33 facing the housing plate 11, and the second sealing ring 413 presses against the gasket 331. Thus, the gasket 331 not only smoothes the contact surface between the bearing 33 and the second sealing ring 413, preventing wear of the second sealing ring 413, but also conducts heat, reducing frictional heating caused by the relative rotation of the second sealing ring 413 and the motor shaft 31, thereby extending the service life of the second sealing ring 413.

[0055] Based on the above embodiment, please continue to refer to Figures 4 to 7. A first limiting groove 431 is defined on the outer circumference of the bearing 33, and a second limiting groove 432 is defined on the circumference of the sleeve 411. The first limiting groove 431 and the second limiting groove 432 extend axially, respectively. The sealing assembly 40 further includes a limiting post 43 inserted into the first limiting groove 431 and the second limiting groove 432. In this embodiment, the limiting post 43 cooperates with the first limiting groove 431 and the second limiting groove 432 to limit the circumferential position of the sleeve 411, thereby preventing the sleeve 411 from rotating circumferentially relative to the bearing 33, thereby improving the sealing performance of the seal 41. At the same time, the first limiting groove 431 and the second limiting groove 432 are both elongated, extending axially in their length direction, so that the elastic support function of the compression spring 421 in the axial direction is not affected.

[0056] Based on the above embodiment, the outer circumference of the sleeve 411 is provided with a bearing surface 4114 facing the end cover 32. One end of the compression spring 421 abuts the bearing surface 4114, and the other end abuts the motor assembly 30. In this way, the sleeve 411 acts as a guide, causing the compression spring 421 to be compressed in the axial direction.

[0057] Furthermore, the end cap 32 is provided with a bearing 33 having an open slot (not shown) facing the shell plate 11. The open slot is circumferentially arranged around the outer circumference of the motor shaft 31. The compression spring 421 is inserted into the open slot, abutting one end of the motor assembly 30 and contacting the bottom of the slot. This slot further guides the compression spring 421 to prevent it from deflecting.

[0058] Optionally, a third sealing ring (not shown) is sleeved on the motor shaft 31 and sandwiched between the inner periphery of the shaft hole 111 and the outer periphery of the motor shaft 31. This provides a dual seal for the shaft hole 111. If the third sealing ring fails, the first sealing ring 412 and the second sealing ring 413 continue to seal, thereby enhancing the sealing performance of the pump body 1 and extending its service life.

[0059] Further, please continue to refer to Figures 3 and 4. The sealing structure 40 includes a third sealing ring (not shown in the figures) sleeved on the motor shaft 31, and a sealing member 41. The third sealing ring is sandwiched between the inner periphery of the shaft hole 111 and the outer periphery of the motor shaft 31. The sealing member 41 is arranged on the side of the third sealing ring facing away from the pump housing 10 and has a sealing cavity 410. When the sealing of the third sealing ring fails, the sealing cavity 410 communicates with the accommodating cavity 110. In this embodiment, the sealing structure 40 performs a double sealing function on the shaft hole 111. When the sealing of the third sealing ring fails, the first sealing ring 412 and the second sealing ring 413 continue to perform a sealing function, thereby enhancing the sealing performance of the pump body 1 and improving the service life of the pump body 1.

[0060] In a preferred embodiment, the sealing member 41 includes a sleeve 411, a first sealing ring 412, and a second sealing ring 413. The sleeve 411 is sleeved around the outer circumference of the motor shaft 31 and has a first end 4111 proximal to the axial hole 111 and a second end 4112 distal to the axial hole 1111. The inner circumference of the sleeve 411 and the outer circumference of the motor shaft 31 define a sealed cavity 410. The sealed cavity 410 can communicate with the accommodating cavity 110 through the axial hole 111. The first sealing ring 412 is disposed between the first end 4111 and the pump housing 10, and the second sealing ring 413 is disposed between the second end 4112 and the motor shaft 31. The first sealing ring 412 and the second sealing ring 413 are configured to jointly seal the sealed cavity 410. In this embodiment, the first sealing ring 412 and the second sealing ring 413 are disposed at both ends of the sleeve 411 in the axial direction to seal the sealed cavity 410 from both ends, achieving a good sealing effect. With this arrangement, when the third sealing ring fails to seal, the sealing member 41 can continue to perform the sealing function, thereby extending the sealing performance of the cavity 110.

[0061] In a preferred embodiment, the sealing structure 40 further includes an elastic member 42, which elastically supports the sealing member 41 to limit the position of the sealing member 41. The type of the elastic member 42 is not limited and may be, for example, a compression spring 421, a coil spring, or an elastic rubber pad. Preferably, the elastic member 42 has a structure that can stably support the sealing member 41 while not hindering the rotation of the motor shaft 31. The elastic member 42 can elastically support the sealing member 41 in the axial direction to absorb axial vibration of the motor shaft 31, or it can elastically support the sealing member 41 in the radial direction to absorb radial vibration of the motor shaft 31. In this embodiment, the elastic member 42 not only reliably limits the position of the sealing member 41 but also facilitates assembly and disassembly of the sealing structure 40. Furthermore, the elastic member 42 can absorb vibration energy generated during motor operation, reducing the adverse effects of motor vibration on the sealing member 41, and reducing the possibility of the sealing ring loosening and seal failure, thereby extending the service life of the pump body 1.

[0062] Specifically, in one embodiment, referring to Figures 4 to 7, the pump housing 10 has a shell plate 11 facing the end cover 32, and the axial hole 111 is provided on the shell plate 11. The shell plate 11 can be integrally formed on the pump body 1, or assembled on the pump housing 10, as long as the sealing of the cavity 110 can be maintained. The integral molding of the pump housing 10 can make the cavity 110 have good sealing performance, and the assembly of the pump housing 10 to the cavity 110 can facilitate the installation of the drive assembly 20 inside the cavity 110. In this embodiment, the shell plate 11 is a part of the pump housing 10 and is provided with an axial hole 111. The end cover 32 of the motor assembly 30 is spaced apart from the shell plate 11 in the axial direction, and the motor shaft 31 extends from the end cover 32, passes through the sealing structure 40, and then passes through the axial hole 111 and extends into the cavity 110.

[0063] The elastic member 42 includes a compression spring 421 extending in the axial direction, one end of the compression spring 421 elastically abuts against the seal 41, and the other end is connected to the motor assembly 30. In this way, the compression spring 421 elastically presses the seal 41 against the shaft hole 111 in the direction extending from the end cover 32 to the shell plate 11 to achieve a sealing effect. In this embodiment, when installing the pump body 1, the compression spring 421 and the seal 41 can be first sleeved one by one on the outer periphery of the motor shaft 31, and then the pump housing 10 can be installed, which is easy to operate. After installation, the elastic pressure of the compression spring 421 reliably presses the seal 41 against the shaft hole 111 to achieve sealing of the shaft hole 111. When the pump body 1 is working, the compression spring 421 can well absorb the axial vibration of the motor assembly 30 when it is working, reduce the shaking effect of the vibration of the motor assembly 30 on the seal 41, reduce the probability of the seal 41 loosening due to vibration, improve the sealing performance of the sealing structure 40, and extend the service life of the pump body 1.

[0064] Based on the above embodiment, referring to Figures 4 to 7 , the side of the shell plate 11 facing the end cap 32 includes a sealing groove 12 circumferentially disposed on the outer periphery of the axial hole 111. The first end 4111 is provided with an annular step 4113 inserted into the sealing groove 12. The first sealing ring 412 is sleeved around the outer periphery of the annular step 4113 and abuts the bottom wall and side walls of the sealing groove 12. In this manner, the first sealing ring 412 is axially limited by the sleeve 411 and is less susceptible to axial movement and deformation. Furthermore, the first sealing ring 412 provides sealing on both the inner and outer circumferences, as well as the upper and lower sides, in the radial direction, resulting in a larger sealing contact surface and a better sealing effect. When the hydraulic pressure within the sealing chamber 410 increases, the first sealing ring 412 is pressed more tightly against the shell plate 11, enhancing the sealing effect and improving the sealing performance of the sealing structure 40.

[0065] In one embodiment, please continue to refer to Figure 4, the sleeve 411 is open at the second end 4112, and the second sealing ring 413 is arranged in the sealing cavity 410, and is clamped between the inner wall of the sealing cavity 410 and the outer periphery of the motor shaft 31. In this embodiment, the sleeve 411 plays a role in tightening the second sealing ring 413, thereby enhancing the sealing performance of the second sealing ring 413. Preferably, the material of the sleeve 411 is a material with a certain elasticity such as rubber, silicone, etc., so that it plays a role in increasing the friction resistance to the second sealing ring 413 and reducing the rotation of the second sealing ring 413 with the motor shaft 31. Preferably, the material of the sleeve 411 can be a material with good thermal conductivity such as graphite or metal, so as to reduce the friction temperature rise of the second sealing ring 413 when the motor shaft 31 rotates, thereby improving the service life of the second sealing ring 413.

[0066] Further, referring to Figures 4 to 7 , a bearing 33 is provided on the end cap 32 , from which the motor shaft 31 extends. The bearing 33 is partially inserted into the opening, and the second sealing ring 413 abuts against the bearing 33 on the side facing away from the sealed cavity 410 . In this embodiment, the end of the bearing 33 facing the shell plate 11 axially supports the second sealing ring 413 , thereby limiting the axial position of the second sealing ring 413 . Furthermore, when the hydraulic pressure within the sealed cavity 410 increases, the second sealing ring 413 can be pressed more tightly against the bearing 33 , further enhancing the sealing performance of the second sealing ring 413 by utilizing the hydraulic pressure.

[0067] Optionally, a gasket 331 is provided on the end of the bearing 33 facing the housing plate 11, and the second sealing ring 413 presses against the gasket 331. Thus, the gasket 331 not only smoothes the contact surface between the bearing 33 and the second sealing ring 413, preventing wear of the second sealing ring 413, but also conducts heat, reducing frictional heating caused by the relative rotation of the second sealing ring 413 and the motor shaft 31, thereby extending the service life of the second sealing ring 413.

[0068] Based on the above embodiment, please continue to refer to Figures 4 to 7. A first limiting groove 431 is defined on the outer circumference of the bearing 33, and a second limiting groove 432 is defined on the circumference of the sleeve 411. The first limiting groove 431 and the second limiting groove 432 extend axially, respectively. The sealing structure 40 further includes a limiting post 43 inserted into the first limiting groove 431 and the second limiting groove 432. In this embodiment, the limiting post 43 cooperates with the first limiting groove 431 and the second limiting groove 432 to limit the circumferential position of the sleeve 411, thereby preventing the sleeve 411 from rotating circumferentially relative to the bearing 33, thereby improving the sealing performance of the seal 41. At the same time, the first limiting groove 431 and the second limiting groove 432 are both elongated, extending axially in their length direction, so that the elastic support function of the compression spring 421 in the axial direction is not affected.

[0069] Based on the above embodiment, the outer circumference of the sleeve 411 is provided with a bearing surface 4114 facing the end cover 32. One end of the compression spring 421 abuts the bearing surface 4114, and the other end abuts the motor assembly 30. In this way, the sleeve 411 acts as a guide, causing the compression spring 421 to be compressed in the axial direction.

[0070] Furthermore, the end cap 32 is provided with a bearing 33 having an open slot (not shown) facing the shell plate 11. The open slot is circumferentially arranged around the outer circumference of the motor shaft 31. The compression spring 421 is inserted into the open slot, abutting one end of the motor assembly 30 and contacting the bottom of the slot. This slot further guides the compression spring 421 to prevent it from deflecting.

[0071] Continuing to refer to Figures 4 and 5, the elastic member 42 further includes a retaining spring 422, which is arranged in a circumferentially extending, notched, annular shape. The retaining spring 422 is sleeved around the outer circumference of the sleeve 411 and connected to the motor assembly 30. In this embodiment, the elastic member 42 further includes a retaining spring 422, which elastically supports the seal 41 in the radial direction to absorb radial vibration of the motor, further improving the vibration resistance of the seal 41 and reducing the chance of seal failure due to loosening due to vibration.

[0072] Based on the above embodiment, the motor assembly 30 further includes a wall portion 50 disposed between the shell plate 11 and the end cover 32. The wall portion 50 surrounds the outer periphery of the seal 41 and is connected to the end cover 32. A circumferentially extending mounting groove 51 is recessed on the inner periphery of the wall portion 50, and the outer periphery of the retaining spring 422 is embedded in the mounting groove 51. In this embodiment, the annular mounting groove 51 provided on the wall portion 50 radially secures and supports the retaining spring 422, thereby firmly supporting the sleeve 411. Preferably, the wall portion 50 may also be provided with screw holes and / or studs for mounting the pump body 1.

[0073] The drive assembly 20 is arranged in the pump housing 10, and is used to drive the liquid to flow from the liquid inlet channel 101 into the cavity 110 and out of the liquid outlet channel 102. The drive assembly 20 includes a driving gear 21 and a driven gear 22 that are meshed with each other. One of the driving gear 21 and the driven gear 22 is a driving gear, and the other is a driven gear. Its specific structure can be set according to the type of the gear pump 1. For example, the driving gear 21 and the driven gear 22 can be two gears that are meshed with each other or an outer ring gear and an inner gear that are meshed with each other. The motor assembly 30 is used to drive the driving gear in the driving gear 21 and the driven gear 22 to rotate. Preferably, the motor assembly 30 includes an axially extending motor shaft 31, and the motor shaft 31 is keyed to the driving gear 21 to drive it to rotate.

[0074] In this embodiment, the driving gear 21 and the driven gear 22 respectively rotate about an axially extending rotation axis 221. Specifically, the driving gear 21 and the driven gear 22 separate the accommodating chamber 110 into a liquid inlet chamber and a liquid outlet chamber. The pump housing 10 is provided with a liquid inlet channel 101 and a liquid outlet channel 102 on two radially opposite sides, respectively. The liquid inlet channel 101 communicates with the liquid inlet chamber, and the liquid outlet channel 102 communicates with the liquid outlet chamber.

[0075] The meshing point of the driving gear 21 and the driven gear 22 forms a meshing gap 23, which is located between the liquid inlet chamber and the liquid outlet chamber. When the driving gear 21 and the driven gear 22 rotate, the meshing gap 23 opens back and forth toward the liquid inlet chamber and the liquid outlet chamber, respectively, thereby transferring liquid from the liquid inlet chamber to the liquid outlet chamber. In other words, the meshing gap 23 is a liquid transfer space located at the meshing point of the driving gear 21 and the driven gear 22. Its function is to draw liquid from the liquid inlet chamber when it opens toward the liquid inlet chamber, and to transfer liquid when it opens toward the liquid outlet chamber.

[0076] In this embodiment, the pump casing 10 further includes a shell plate 11 and a second inner wall 14 that are axially opposite to each other. The shell plate 11, the second inner wall 14, and the peripheral wall extending therebetween jointly enclose and define the accommodating cavity 110. It can be understood that the end surfaces of the driving gear 21 and the driven gear 22 facing the shell plate 11 and the second inner wall 14 should be respectively fitted with the corresponding shell plate 11 and the second inner wall 14 to achieve sealing, thereby separating the liquid inlet chamber and the liquid outlet chamber.

[0077] Based on this, referring to Figures 8 to 11, in order to reduce the friction between the inner wall of the pump housing 10 and the end faces of the driving gear 21 and the driven gear 22, a liquid guide groove is provided on the housing plate 11 and / or the second inner wall 14. The liquid guide groove is connected to the meshing gap 23, and one end of the liquid guide groove extends to the end side of the driving gear 21, and the other end extends to the end side of the driven gear 22. In this way, the liquid guide groove guides liquid from the meshing gap 23 between the driving gear 21 and the driven gear 22 for transmitting liquid into the gap between the end sides of the driving gear 21 and the driven gear 22 and the inner wall. The liquid in the gap acts as a lubricant, reducing the frictional resistance between the inner wall and the driving gear 21 and the driven gear 22, reducing the wear of the driving gear 21 and the driven gear 22 during operation, thereby improving the service life of the gear pump 1.

[0078] In one embodiment, please continue to refer to Figures 8 and 11. The shell plate 11 is provided with the liquid guide groove. Specifically, the liquid guide groove includes a first liquid guide groove 130 provided on the shell plate 11. One end of the first liquid guide groove 130 extends to the end surface of the driving gear 21 facing the shell plate 11, and the other end of the first liquid guide groove 130 extends to the end surface of the driven gear 22 facing the second inner wall 14. In this way, when the driving gear 21 and the driven gear 22 rotate, the liquid in the liquid guide groove is brought to the gap between each end surface and the shell plate 11, which plays a good lubrication role while maintaining the sealing performance of the driving gear 21 and the driven gear 22.

[0079] Furthermore, the motor assembly 30 also includes an end cap 32, the motor shaft 31 extends from the end cap 32, the shell 11 faces the end cap 32 and is provided with an axial hole 111. The motor shaft 31 is inserted into the cavity 110 through the axial hole 111 and is keyed to the driving gear 21, thereby driving the driving gear 21 to rotate. One end of the first liquid guide groove 130 is connected to the axial hole 111. In this way, when the gear pump 1 needs to be cleaned or repaired, after the motor is disassembled, the liquid in the cavity 110 can flow out of the axial hole 111, making it easier to inspect and repair it.

[0080] Further, referring to FIG8 , the rotating shaft 221 of the driven gear 22 is at least partially recessed on the side of the driven gear 22 facing the shell plate 11 to form a groove 222. The other end of the first liquid guide groove 130 opposite the shaft hole 111 communicates with the groove 222. In this embodiment, the groove 222 formed by the rotating shaft 221 accommodates liquid introduced from the first liquid guide groove 130, allowing the liquid to gradually penetrate from the circumference of the rotating shaft 221 into the gap between the end face of the driven gear 22 and the shell plate 11, achieving uniform penetration and improving lubrication.

[0081] On the basis of the above embodiment, please continue to refer to Figures 8 to 11. The pump housing 10 includes a shell 71 and a cover 72. The shell 71 forms the cavity 110 having an opening 53, and the opening 53 faces the end cover 32. The cover 72 is provided on the side of the opening 53 of the shell 71. The side of the cover 72 facing the cavity 110 has the shell plate 11, and the inner side of the shell 71 facing the opening 53 has the second inner wall 14. In this embodiment, the pump housing 10 adopts a split design, which is easy to disassemble for cleaning or maintenance. When disassembling, the motor can be removed first, so that the liquid in the cavity 110 flows out from the shaft hole 111, and then the cover 72 can be opened to clean or repair the drive assembly 20 inside the cavity 110. The operation is simple, and the liquid in the cavity 110 can be discharged in an orderly manner without causing environmental pollution.

[0082] Furthermore, referring to Figure 9 , the housing 71 and the cover 72 are detachably connected, with a sealing ring 54 disposed between them. The sealing ring 54 surrounds the outer circumference of the opening 53. Preferably, an annular groove is provided on the end surface of the housing 71 facing the cover 72, with the sealing ring 54 partially accommodated within the groove. The groove acts as a position limiter and increases the contact area with the sealing ring 54, thereby enhancing sealing performance. This ensures a good seal between the housing 71 and the cover 72, preventing liquid in the chamber 110 from leaking through the connection between the two.

[0083] In one embodiment, please continue to refer to Figures 9 to 11. A mounting seat 60 is provided between the end cap 32 and the cover body 72. The mounting seat 60 is detachably connected to the end cap 32. For example, the end cap 32 can be connected by screwing or snapping. The mounting seat 60 is also integrally formed with the cover body 72, so that the housing 71 is connected through the cover body 72. A mounting cavity 61 is formed inside the mounting seat 60. The motor shaft 31 passes through the mounting cavity 61, and a sealing assembly 40 is provided on the shaft section within the mounting cavity 61. The sealing assembly 40 is used to block the shaft hole 111. In this embodiment, the mounting seat 60 serves to mount the gear pump 1 as a whole to the body (such as a beverage mixing device). At the same time, a mounting cavity 61 is also formed inside the mounting seat 60 to accommodate the sealing assembly 40 that blocks the shaft hole 111. The mounting seat 60 is integrally formed with the cover body 72 to facilitate the assembly and disassembly of the gear pump 1 as a whole.

[0084] On the basis of the previous embodiment, the sealing assembly 40 includes a sealing member 41 and an elastic member 42 sleeved on the motor shaft 31. One end of the elastic member 42 abuts against the sealing member 41 so that the sealing member 41 is pressed against the shaft hole 111, and the other end of the elastic member 42 abuts against the bearing 33 provided on the end cover 32. On the one hand, the elastic member 42 acts as a limiter so that the sealing member 41 is pressed against the shaft hole 111. On the other hand, it can absorb the vibration of the motor assembly 30 and prevent the sealing member 41 from being affected and loosened. In addition, it also facilitates the assembly and disassembly of the motor shaft 31. For example, when disassembly is required, it is only necessary to separate the mounting base 60 and the end cover 32, and the elastic member 42 can be separated from the sealing member 41. In this way, the sealing member 41 can be easily removed, allowing the liquid to flow out of the cavity 110.

[0085] There are many ways to connect the mounting base 60 to the body. In a preferred embodiment, a connector 62 is provided on the peripheral side of the mounting base 60. The connector 62 can be a stud, a screw hole, etc. The connector 62 is used to connect and fix the gear pump 1 to the body.

[0086] Based on the above embodiment, a liquid guide groove is also provided on the second inner wall 14 on the shell 71. Specifically, the liquid guide groove includes a second liquid guide groove 140 provided on the second inner wall 14. The first liquid guide groove 130 also extends between the end surface of the driving gear 21 facing the second inner wall 14 and the end surface of the driven gear 22 facing the second inner wall 14. Specifically, please refer to Figure 3. The second inner wall 14 is provided with a first open groove 121 and a second open groove 122. The first open groove 121 accommodates the motor shaft 31, and the second open groove 122 accommodates the rotating shaft 221 of the driven gear 22. One end of the second liquid guide groove 140 extends to connect with the first open groove 121, and the other end extends to connect with the second open groove 122. In this way, liquid can not only penetrate into the end faces between the driving gear 21 and the driven gear 22 and the second inner wall 14, but also penetrate into the first open groove 121 and the second open groove 122, so that the gap between the first open groove 121 and the motor shaft 31, and the gap between the second open groove 122 and the rotating shaft 221 are filled with liquid, thereby playing the role of lubricating the motor shaft 31 and the rotating shaft 221, further reducing the rotational resistance of the driving gear 21 and the driven gear 22, improving their working efficiency, reducing wear, and extending the service life of the gear pump 1.

[0087] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A gear pump with improved sealing performance, characterized in that: include: A pump housing having a cavity, wherein the pump housing has a liquid inlet channel, a liquid outlet channel and an axial hole communicating with the cavity; A driving assembly, disposed in the chamber, for driving the liquid to flow from the liquid inlet channel into the chamber and out of the liquid outlet channel; A motor assembly, comprising an end cover and a motor shaft extending from the end cover, wherein the motor shaft extends from the shaft hole into the cavity and is drivingly connected to the drive assembly; and The sealing assembly comprises a sealing member and an elastic member. The sealing member is arranged around the outer circumference of the motor shaft and is used to block the shaft hole. The elastic member elastically supports the sealing member to limit the position of the sealing member.

2. The gear pump with improved sealing performance as claimed in claim 1, characterized in that: The pump housing comprises a shell plate facing the end cover, the axial hole is provided on the shell plate, the elastic member comprises a compression spring extending in the axial direction, one end of the compression spring elastically abuts against the sealing member, and the other end is connected to the motor assembly.

3. The gear pump with improved sealing performance as claimed in claim 2, characterized in that: The sealing member includes a sleeve, a first sealing ring and a second sealing ring. The sleeve is sleeved on the outer circumference of the motor shaft and has a first end close to the shell plate and a second end close to the end cover. A sealing cavity is defined between the inner circumference of the sleeve and the outer circumference of the motor shaft. The sealing cavity is connected to the accommodating cavity. The first sealing ring is arranged between the first end and the shell plate, and the second sealing ring is arranged between the second end and the motor shaft. The first sealing ring and the second sealing ring are used to jointly seal the sealing cavity.

4. The gear pump with improved sealing performance as claimed in claim 3, characterized in that: The shell plate has a sealing groove arranged on the outer periphery of the axial hole on one side facing the end cover, the first end is provided with an annular step inserted into the sealing groove, the first sealing ring is sleeved on the outer periphery of the annular step and abuts against the bottom wall and side walls of the sealing groove.

5. The gear pump with improved sealing performance as claimed in claim 3, characterized in that: The sleeve is open at the second end, and the second sealing ring is arranged in the sealing cavity and sandwiched between the inner side wall of the sealing cavity and the outer periphery of the motor shaft.

6. The gear pump with improved sealing performance as claimed in claim 5, characterized in that: A bearing is arranged on the end cover, the motor shaft extends from the bearing, a part of the bearing is inserted into the opening, and the second sealing ring abuts against the bearing on a side facing away from the sealing cavity.

7. The gear pump with improved sealing performance as claimed in claim 6, characterized in that: A gasket is arranged on the end side of the bearing facing the shell plate, and the second sealing ring is pressed against the gasket.

8. The gear pump with improved sealing performance as claimed in claim 6, characterized in that: A first limiting groove is formed on the outer peripheral side of the bearing, and a second limiting groove is formed on the peripheral side of the sleeve. The first limiting groove and the second limiting groove extend axially respectively, and the sealing assembly also includes limiting columns inserted in the first limiting groove and the second limiting groove.

9. The gear pump with improved sealing performance as claimed in claim 3, characterized in that: The outer circumference of the sleeve is provided with a bearing surface facing the end cover, one end of the compression spring abuts against the bearing surface, and the other end abuts against the motor assembly.

10. The gear pump with improved sealing performance according to claim 9, characterized in that: A bearing is arranged on the end cover, and the bearing has an open groove facing the shell plate, and the open groove is arranged around the outer circumference of the motor shaft. One end of the compression spring abuts against the motor component and is inserted into the open groove and abuts against the bottom of the open groove.

11. The gear pump with improved sealing performance according to claim 3, characterized in that: The elastic member further comprises a retaining spring, which is arranged in a ring shape extending in the circumferential direction and having a notch. The retaining spring is sleeved on the outer circumference of the sleeve and connected to the motor assembly.

12. The gear pump with improved sealing performance according to claim 11, characterized in that: The motor assembly also includes a wall portion arranged between the shell plate and the end cover, the wall portion is arranged around the outer periphery of the seal and connected to the end cover, the inner periphery of the wall portion is recessed with a mounting groove extending along the circumferential direction, and the outer periphery of the retaining ring is embedded in the mounting groove.

13. A gear pump with improved sealing performance as claimed in any one of claims 1 to 12, characterized in that: The driving assembly includes a driving gear and a driven gear meshing with each other, the motor shaft is key-connected with the driving gear, and the driving gear and the driven gear divide the cavity into a liquid inlet cavity adjacent to the liquid inlet channel and a liquid outlet cavity adjacent to the liquid outlet channel.

14. A sealing structure for sealing an axial hole provided on a pump housing, wherein the axial hole allows a motor shaft to extend into a cavity in the pump housing, characterized in that: The sealing structure comprises: a third sealing ring, arranged around the outer periphery of the motor shaft and sandwiched between the inner periphery of the shaft hole and the outer periphery of the motor shaft; and, A sealing member is arranged in an annular manner on the outer circumference of the motor shaft. The sealing member is arranged on the side of the third sealing ring facing away from the pump housing and has a sealing cavity. When the sealing of the third sealing ring fails, the sealing cavity is connected to the containing cavity.

15. The sealing structure according to claim 14, characterized in that: The sealing member includes a sleeve, a first sealing ring and a second sealing ring. The sleeve is sleeved on the outer circumference of the motor shaft and has a first end close to the axial hole and a second end away from the axial hole. The sealing cavity is defined between the inner circumference of the sleeve and the outer circumference of the motor shaft. The first sealing ring is arranged between the first end and the pump housing, and the second sealing ring is arranged between the second end and the motor shaft. The first sealing ring and the second sealing ring are used to jointly seal the sealing cavity.

16. The sealing structure according to claim 15, characterized in that: The pump housing has a sealing groove arranged on the outer periphery of the axial hole on one side facing the sealing element, and the first end is provided with an annular step inserted into the sealing groove, and the first sealing ring is sleeved on the outer periphery of the annular step and abuts against the bottom wall and side walls of the sealing groove.

17. The sealing structure according to claim 15, characterized in that: The sleeve is open at the second end, and the second sealing ring is arranged in the sealing cavity and sandwiched between the inner side wall of the sealing cavity and the outer periphery of the motor shaft.

18. The sealing structure according to claim 17, characterized in that: The motor shaft extends from the end cover, a bearing is arranged on the end cover, a part of the bearing is inserted into the opening, and the second sealing ring abuts against the bearing on a side facing away from the sealing cavity.

19. The sealing structure according to claim 18, characterized in that: A gasket is arranged on the end side of the bearing facing the shaft hole, and the second sealing ring is pressed against the gasket.

20. The sealing structure according to any one of claims 15 to 19, characterized in that: The sealing structure further comprises an elastic member, wherein the elastic member elastically supports the sealing member to limit the position of the sealing member.

21. The sealing structure according to claim 20, characterized in that: The elastic member comprises a compression spring extending in the axial direction, one end of the compression spring elastically abuts against the sealing member, and the other end of the compression spring is connected to the motor assembly.

22. The sealing structure according to claim 20, characterized in that: The elastic member comprises a retaining spring, which is arranged in a ring shape extending in the circumferential direction and having a notch. The retaining spring is sleeved on the outer circumference of the sleeve and connected to the motor assembly.

23. A gear pump, characterized in that: include: A pump housing having a cavity, wherein the pump housing has a liquid inlet channel, a liquid outlet channel and an axial hole communicating with the cavity; A driving assembly, disposed in the chamber, for driving the liquid to flow from the liquid inlet channel into the chamber and out of the liquid outlet channel; A motor assembly, comprising an end cover and a motor shaft extending from the end cover, wherein the motor shaft extends from the shaft hole into the cavity and is drivingly connected to the drive assembly; and A sealing structure includes a third sealing ring and a sealing member, wherein the third sealing ring is arranged on the outer periphery of the motor shaft and is clamped between the inner periphery of the shaft hole and the outer periphery of the motor shaft; the sealing member is arranged on the outer periphery of the motor shaft, and the sealing member is arranged on the side of the third sealing ring facing away from the pump housing and has a sealing cavity. When the sealing of the third sealing ring fails, the sealing cavity is connected to the containing cavity.

24. A gear pump with improved sealing performance, characterized in that: include: A pump housing having a cavity, wherein the pump housing has a liquid inlet channel, a liquid outlet channel and an axial hole communicating with the cavity; a driving assembly disposed in the cavity, and used to drive liquid to flow from the liquid inlet channel into the cavity and flow out from the liquid outlet channel; a motor assembly, comprising an end cover and a motor shaft extending from the end cover, wherein the motor shaft extends from the axial hole into the cavity and is in driving connection with the driving assembly; and, A sealing assembly includes a sealing member and an elastic member. The sealing member is annularly arranged on the outer circumference of the motor shaft and is used to seal the shaft hole. The sealing member includes a sleeve, a first sealing ring and a second sealing ring. The sleeve is sleeved on the outer circumference of the motor shaft. A sealing cavity is defined between the inner circumference of the sleeve and the outer circumference of the motor shaft. The first sealing ring and the second sealing ring are used to jointly seal the sealing cavity. The elastic member includes a compression spring extending in the axial direction, one end of the compression spring elastically abuts against the sleeve, and the other end is connected to the motor assembly.

25. The gear pump with improved sealing performance as claimed in claim 24, characterized in that: The outer circumference of the sleeve is provided with a bearing surface facing the end cover, one end of the compression spring abuts against the bearing surface, and the other end abuts against the motor assembly.

26. The gear pump with improved sealing performance as claimed in claim 25, characterized in that: A step portion is provided on the outer periphery of the end cover, and the step portion forms the bearing surface on a side facing the end cover in the axial direction.

27. The gear pump with improved sealing performance as claimed in claim 24, characterized in that: The pump casing has a shell plate facing the end cover, the axial hole is opened on the shell plate, a bearing is arranged on the end cover, the motor shaft extends from the bearing, the bearing has an open groove facing the shell plate, the open groove is arranged around the outer periphery of the motor shaft, and the compression spring abuts against one end of the motor assembly, is inserted into the open groove, and abuts against the bottom of the open groove.

28. The gear pump with improved sealing performance as claimed in claim 27, characterized in that: The sleeve has a first end close to the shell plate and a second end close to the end cover, the first sealing ring is arranged between the first end and the shell plate, and the second sealing ring is arranged between the second end and the motor shaft.

29. The gear pump with improved sealing performance as claimed in claim 28, characterized in that: The shell plate has a sealing groove arranged on the outer periphery of the axial hole on one side facing the end cover, the first end is provided with an annular step inserted into the sealing groove, the first sealing ring is sleeved on the outer periphery of the annular step and abuts against the bottom wall and side walls of the sealing groove.

30. The gear pump with improved sealing performance as claimed in claim 28, characterized in that: The sleeve is open at the second end, and the second sealing ring is arranged in the sealing cavity and sandwiched between the inner side wall of the sealing cavity and the outer periphery of the motor shaft.

31. The gear pump with improved sealing performance as claimed in claim 30, characterized in that: The bearing is partially inserted into the opening, and the second sealing ring abuts against the bearing on a side facing away from the sealing cavity.

32. The gear pump with improved sealing performance as claimed in claim 31, characterized in that: A gasket is arranged on the end side of the bearing facing the shell plate, and the second sealing ring is pressed against the gasket.

33. The gear pump with improved sealing performance as claimed in claim 31, characterized in that: A first limiting groove is formed on the outer peripheral side of the bearing, and a second limiting groove is formed on the peripheral side of the sleeve. The first limiting groove and the second limiting groove extend axially respectively, and the sealing assembly also includes limiting columns inserted in the first limiting groove and the second limiting groove.

34. A gear pump with improved sealing performance, characterized in that: include: A pump housing having a cavity, wherein the pump housing has a liquid inlet channel, a liquid outlet channel and an axial hole communicating with the cavity; A driving assembly, disposed in the chamber, for driving the liquid to flow from the liquid inlet channel into the chamber and out of the liquid outlet channel; A motor assembly, comprising an end cover and a motor shaft extending from the end cover, wherein the motor shaft extends from the shaft hole into the cavity and is drivingly connected to the drive assembly; and A sealing assembly includes a sealing member and an elastic member. The sealing member is annularly arranged on the outer circumference of the motor shaft and is used to seal the shaft hole. The sealing member includes a sleeve, a first sealing ring and a second sealing ring. The sleeve is sleeved on the outer circumference of the motor shaft. A sealing cavity is defined between the inner circumference of the sleeve and the outer circumference of the motor shaft. The first sealing ring and the second sealing ring are used to jointly seal the sealing cavity. The elastic member also includes a retaining spring. The retaining spring is annularly arranged extending in the circumferential direction and having a notch. The retaining spring is sleeved on the outer circumference of the sleeve and is connected to the motor assembly.

35. The gear pump with improved sealing performance as claimed in claim 34, characterized in that: The pump casing has a shell plate facing the end cover, the axial hole is opened on the shell plate, the motor assembly also includes a wall portion arranged between the shell plate and the end cover, the wall portion is arranged around the outer periphery of the seal and connected to the end cover, the inner periphery of the wall portion is recessed with a mounting groove extending in the circumferential direction, and the outer periphery of the retaining ring is embedded in the mounting groove.

36. The gear pump with improved sealing performance as claimed in claim 35, characterized in that: The wall portion is provided with screw holes and / or studs for mounting the gear pump.

37. The gear pump with improved sealing performance as claimed in claim 35, characterized in that: The shell plate is fixed to a side of the wall portion facing away from the end cover.

38. The gear pump with improved sealing performance as claimed in claim 37, characterized in that: The sleeve has a first end close to the shell plate and a second end close to the end cover, the first sealing ring is arranged between the first end and the shell plate, and the second sealing ring is arranged between the second end and the motor shaft.

39. The gear pump with improved sealing performance as claimed in claim 38, characterized in that: The shell plate has a sealing groove arranged on the outer periphery of the axial hole on one side facing the end cover, the first end is provided with an annular step inserted into the sealing groove, the first sealing ring is sleeved on the outer periphery of the annular step and abuts against the bottom wall and side walls of the sealing groove.

40. The gear pump with improved sealing performance as claimed in claim 38, characterized in that: The sleeve is open at the second end, and the second sealing ring is arranged in the sealing cavity and sandwiched between the inner side wall of the sealing cavity and the outer periphery of the motor shaft.

41. The gear pump with improved sealing performance as claimed in claim 40, characterized in that: A bearing is arranged on the end cover, the motor shaft extends from the bearing, a part of the bearing is inserted into the opening, and the second sealing ring abuts against the bearing on a side facing away from the sealing cavity.

42. The gear pump with improved sealing performance as claimed in claim 41, characterized in that: A gasket is arranged on the end side of the bearing facing the shell plate, and the second sealing ring is pressed against the gasket.

43. A gear pump with improved sealing performance as claimed in any one of claims 37 to 42, characterized in that: The gear pump with improved sealing performance is characterized in that the elastic member includes a compression spring extending in the axial direction, one end of the compression spring elastically abuts against the sleeve, and the other end is connected to the motor assembly.

44. A gear pump with improved sealing performance, characterized in that: include: A pump housing having a cavity, the pump housing having a liquid inlet channel, a liquid outlet channel and an axial hole communicating with the cavity, the pump housing having a shell plate, and the axial hole being provided on the shell plate; A driving assembly, disposed in the chamber, for driving the liquid to flow from the liquid inlet channel into the chamber and out of the liquid outlet channel; a motor assembly, comprising an end cover and a motor shaft extending from the end cover, wherein the end cover is arranged facing the shell plate, the motor shaft extends from the shaft hole into the cavity and is drivingly connected to the drive assembly; and A sealing assembly includes a sealing member and an elastic member, wherein the sealing member is used to seal the shaft hole, the sealing member is arranged around the outer periphery of the motor shaft, and includes a sleeve, a first sealing ring, a second sealing ring and a third sealing ring. The sleeve is sleeved on the outer periphery of the motor shaft, and a sealing cavity is defined between the inner periphery of the sleeve and the outer periphery of the motor shaft. The first sealing ring and the second sealing ring are used to jointly seal the sealing cavity. The third sealing ring is sleeved on the motor shaft, and the third sealing ring is clamped between the inner periphery of the shaft hole and the outer periphery of the motor shaft. The elastic member elastically supports the sleeve to limit the sealing member.

45. The gear pump with improved sealing performance as claimed in claim 44, characterized in that: The elastic member comprises a compression spring extending in the axial direction, one end of the compression spring elastically abuts against the sleeve, and the other end of the compression spring is connected to the motor assembly.

46. ​​The gear pump with improved sealing performance as claimed in claim 45, characterized in that: The outer circumference of the sleeve is provided with a bearing surface facing the end cover, one end of the compression spring abuts against the bearing surface, and the other end abuts against the motor assembly.

47. The gear pump with improved sealing performance as claimed in claim 46, characterized in that: A bearing is provided on the end cover, the motor shaft extends from the bearing, the bearing has an open groove facing the shell plate, the open groove is arranged around the outer circumference of the motor shaft, and the compression spring abuts against one end of the motor component and is inserted into the open groove and abuts against the bottom of the open groove.

48. The gear pump with improved sealing performance as claimed in claim 45, characterized in that: The elastic member further comprises a retaining spring, which is arranged in a ring shape extending in the circumferential direction and having a notch. The retaining spring is sleeved on the outer circumference of the sleeve and connected to the motor assembly.

49. The gear pump with improved sealing performance as claimed in claim 48, characterized in that: The motor assembly also includes a wall portion arranged between the shell plate and the end cover, the wall portion is arranged around the outer periphery of the seal and connected to the end cover, the inner periphery of the wall portion is recessed with a mounting groove extending along the circumferential direction, and the outer periphery of the retaining ring is embedded in the mounting groove.

50. The gear pump with improved sealing performance as claimed in any one of claims 45 to 49, characterized in that: The sleeve has a first end close to the shell plate and a second end close to the end cover, the first sealing ring is arranged between the first end and the shell plate, and the second sealing ring is arranged between the second end and the motor shaft.

51. The gear pump with improved sealing performance as claimed in claim 50, characterized in that: The shell plate has a sealing groove arranged on the outer periphery of the axial hole on one side facing the end cover, the first end is provided with an annular step inserted into the sealing groove, the first sealing ring is sleeved on the outer periphery of the annular step and abuts against the bottom wall and side walls of the sealing groove.

52. The gear pump with improved sealing performance as claimed in claim 50, characterized in that: The sleeve is open at the second end, and the second sealing ring is arranged in the sealing cavity and sandwiched between the inner side wall of the sealing cavity and the outer periphery of the motor shaft.

53. The gear pump with improved sealing performance as claimed in claim 52, characterized in that: A bearing is arranged on the end cover, the motor shaft extends from the bearing, the bearing is partially inserted in the opening, the second sealing ring abuts against the bearing on the side facing away from the sealing cavity, a first limiting groove is provided on the outer peripheral side of the bearing, a second limiting groove is provided on the peripheral side of the sleeve, the first limiting groove and the second limiting groove extend axially respectively, and the sealing assembly also includes limiting columns inserted in the first limiting groove and the second limiting groove.

54. A gear pump with a lubrication structure, characterized in that: include: A pump housing having a cavity, the pump housing comprising a shell plate and a second inner wall which are arranged opposite to each other in the axial direction; as well as, A driving assembly is arranged in the cavity, the driving assembly comprises a driving gear and a driven gear meshing with each other, the driving gear and the driven gear respectively rotate around an axially extending rotating shaft, and a meshing gap is formed at a meshing position of the driving gear and the driven gear; A liquid conducting groove is provided on the shell plate and / or the second inner wall, the liquid conducting groove is connected to the meshing gap, and one end of the liquid conducting groove extends to the end side of the driving gear, and the other end extends to the end side of the driven gear.

55. The gear pump with a lubrication structure as claimed in claim 54, characterized in that: The gear pump also includes a motor assembly, which includes an end cover and a motor shaft extending from the end cover. An axial hole is provided on the shell plate, and the motor shaft is inserted into the cavity from the axial hole and is keyed to the driving gear. The liquid guide groove includes a first liquid guide groove provided on the shell plate, and one end of the first liquid guide groove is connected to the axial hole.

56. The gear pump with a lubrication structure as claimed in claim 55, characterized in that: The rotating shaft of the driven gear is at least partially recessed on a side of the driven gear facing the shell plate to form a groove, and the other end of the first liquid guiding groove is connected to the groove.

57. The gear pump with a lubrication structure according to claim 55, characterized in that: The pump casing includes a shell and a cover body, the shell forms the cavity with an opening, the opening faces the end cover, the cover body is arranged on the opening side of the shell, the cover body has the shell plate on the side facing the cavity, and the shell has the second inner wall on the inner side facing the opening.

58. The gear pump with a lubrication structure according to claim 57, characterized in that: The shell and the cover are detachably connected, a sealing ring is arranged between the shell and the cover, and the sealing ring is arranged around the outer circumference of the opening.

59. The gear pump with a lubrication structure according to claim 57, characterized in that: A mounting seat is provided between the end cover and the cover body, the mounting seat is detachably connected to the end cover and is integrally formed with the cover body, a mounting cavity is formed inside the mounting seat, the motor shaft passes through the mounting cavity, and a sealing assembly is provided on the shaft section in the mounting cavity, the sealing assembly is used to seal the shaft hole.

60. The gear pump with a lubrication structure according to claim 59, characterized in that: The sealing assembly includes a sealing member and an elastic member sleeved on the motor shaft, one end of the elastic member abuts against the sealing member so that the sealing member is pressed against the shaft hole, and the other end of the elastic member abuts against a bearing arranged on the end cover.

61. The gear pump with a lubrication structure as claimed in claim 59, characterized in that: A connecting piece is arranged on the peripheral side of the mounting seat, and the connecting piece is used to connect and fix the gear pump to the machine body.

62. The gear pump with a lubrication structure according to any one of claims 55 to 61, characterized in that: The second inner wall is provided with a first opening groove and a second opening groove, the first opening groove accommodates the motor shaft, the second opening groove accommodates the rotating shaft of the driven gear, the liquid guiding groove includes a second liquid guiding groove arranged on the second inner wall, one end of the second liquid guiding groove is connected to the first opening groove, and the other end of the second liquid guiding groove is connected to the second opening groove.

63. The gear pump with a lubrication structure according to any one of claims 54 to 61, characterized in that: The driving gear and the driven gear divide the cavity into a liquid inlet cavity and a liquid outlet cavity. The pump housing is provided with a liquid inlet channel and a liquid outlet channel on two opposite sides in the radial direction. The liquid inlet channel is connected to the liquid inlet cavity, and the liquid outlet channel is connected to the liquid outlet cavity.

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