Pump body

Abstract

The invention discloses a pump body which comprises a pump shell, a pump cavity is formed in the pump shell, the pump shell is further provided with a liquid inlet and a liquid outlet which are communicated with the pump shell, and a driving gear and a driven gear which are meshed with each other are arranged in the pump cavity; the isolation hood is arranged on the end side of the pump shell, and a closed space is formed between the isolation hood and the end side of the pump shell; the inner magnetic assembly is arranged in the closed space and is in transmission connection with the driving gear through a driving shaft, and the driving shaft extends into the isolation hood from the pump shell; the outer magnetic assembly is arranged on the periphery of the inner magnetic assembly and is in transmission connection with the motor; wherein the inner magnetic assembly comprises an annular inner magnetic framework, a first magnet arranged on the periphery of the inner magnetic framework and an injection molding outer carrying frame wrapping the peripheries of the inner magnetic framework and the first magnet, a connecting hole used for being matched with the driving shaft is formed in the center of the injection molding outer carrying frame, and a cavity used for containing the inner magnetic framework and the first magnet is formed in the injection molding outer carrying frame; and the cavity is annularly arranged at the periphery of the connecting hole.

Description

Technical Field

[0001] The invention belongs to the technical field of pump structures, and in particular relates to a pump body. Background Art

[0002] A pump is a machine that transports fluid or pressurizes fluid. It transfers the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. In order to solve the problem of dynamic sealing, most pumps are driven by magnetic force. In the prior art, the pump has the problem of magnetic leakage due to the use of magnetic force drive. Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a pump body capable of reducing magnetic leakage.

[0004] In order to solve the above technical problems, the present invention provides a pump body, comprising: a pump shell, a pump cavity is formed inside, the pump shell is also provided with a liquid inlet and a liquid discharge port connected thereto, and a driving gear and a driven gear meshing with each other are provided in the pump cavity; an isolation cover is arranged at the end side of the pump shell, and a closed space is formed between the end side of the pump shell; an internal magnetic component is arranged in the closed space and is connected to the driving gear through a drive shaft, and the drive shaft extends from the pump shell to the isolation cover; an external magnetic component is arranged at the outer periphery of the internal magnetic component and is connected to the motor; wherein the internal magnetic component comprises an annular internal magnetic skeleton, a first magnet arranged at the outer periphery of the internal magnetic skeleton, and an injection molded outer carrier wrapped around the inner magnetic skeleton and the outer periphery of the first magnet, a connecting hole for cooperating with the drive shaft is formed in the center of the injection molded outer carrier, a cavity for accommodating the inner magnetic skeleton and the first magnet is formed inside the injection molded outer carrier, and the cavity is arranged around the outer periphery of the connecting hole.

[0005] Preferably, the isolation cover contains and only contains the inner magnetic component fixed on the driving shaft.

[0006] Preferably, the injection molded outer carrier is sleeved on one end side of the driving shaft, wherein the injection molded outer carrier is also provided with a tail end hole which is coaxially distributed with the connecting hole and has a smaller aperture than the connecting hole, and a shoulder structure for axially limiting the driving shaft is formed between the connecting hole and the tail end hole.

[0007] Preferably, the external magnetic assembly includes a mounting sleeve fixed on the output shaft of the motor, an external magnetic frame fixed to the inner ring of the mounting sleeve, and a second magnet fixed to the inner ring of the outer magnetic frame, wherein the external magnetic frame and the mounting sleeve are connected by fasteners, and the fasteners are configured to fasten the mounting sleeve to the external magnetic frame from the outside of the mounting sleeve.

[0008] Preferably, the isolation cover is arranged on the end side of the pump casing through an adapter plate, the side of the adapter plate away from the pump casing is connected to a cover shell, the external magnetic assembly is located in the cover shell, and the casing of the motor is connected to the cover shell.

[0009] Preferably, the isolation cover has an open end, the open end is provided with a pressure edge folded outward, the end surface of the pump housing is provided with a first groove for cooperating with the pressure edge, a sealing structure is provided in the first groove, and the pressure edge is clamped between the sealing structure and the adapter plate.

[0010] Preferably, the sealing structure comprises a first flexible rubber ring, a first hard rubber ring and a second hard rubber ring arranged on the outer periphery of the first flexible rubber ring, and a second flexible rubber ring arranged on the outer periphery of the first hard rubber ring and the second hard rubber ring; The first hard rubber ring is closer to the pressure edge distribution than the second hard rubber ring, and there is a first gap between the first hard rubber ring and the second hard rubber ring in the axial direction of the first flexible rubber ring. A spring is arranged in the receiving space formed by the first flexible rubber ring, the second flexible rubber ring, the first hard rubber ring and the second hard rubber ring. The spring is located in the first gap, and one end of the spring abuts against the first hard rubber ring, and the other end abuts against the second hard rubber ring. The first flexible rubber ring and the second flexible rubber ring have the same length in the axial direction, and the end of the first flexible rubber ring is flush with the end of the second flexible rubber ring, the first flexible rubber ring and the second flexible rubber ring are in contact with the groove wall of the groove respectively, and the first hard rubber ring, the second hard rubber ring and the spring are located in a space sandwiched by the first flexible rubber ring and the second flexible rubber ring; The length of the first flexible rubber ring in the axial direction is greater than the sum of the lengths of the first hard rubber ring, the second hard rubber ring and the spring in the axial direction.

[0011] Preferably, the pump housing comprises a base matched with the isolation cover, a middle support arranged on a side of the base away from the isolation cover, and a pump cover arranged on a side of the middle support away from the base, and the base, the middle support and the pump cover are detachably connected; A pump cavity is formed on the middle bearing, a first channel connecting the pump cavity and the isolation cover is provided on the base, a through hole for the drive shaft to pass through is also provided on the base, a pair of third sliding bearings distributed along the axial direction are provided in the through hole, the drive shaft is arranged in the through hole through a pair of the third sliding bearings, and a first spacing exists between the pair of the third sliding bearings in the axial direction; wherein, a guide groove extending in the axial direction is provided on the inner ring of the third sliding bearing, and the axial projection of the first channel is located in the meshing area of ​​the driving gear and the driven gear; a threaded groove is provided on the hole wall of the through hole.

[0012] Preferably, the pump cover is provided with the liquid inlet and the liquid discharge port; the pump chamber includes a first chamber accommodating the driving gear, a second chamber accommodating the driven gear, a third chamber directly opposite the liquid inlet, and a fourth chamber directly opposite the liquid discharge port, wherein the first chamber is connected to the second chamber, and the third chamber and the fourth chamber are separated by the meshing line between the driving gear and the driven gear.

[0013] Preferably, the driven gear is rotatably arranged in the pump housing through the driven shaft, wherein the end surface of the pump cover close to the middle bearing has a first bearing chamber and a second bearing chamber that are axially recessed, a first sliding bearing for supporting the drive shaft is arranged in the first bearing chamber, a second sliding bearing for supporting the driven shaft is arranged in the second bearing chamber, a first space is preset between the first sliding bearing and the end surface of the first bearing chamber away from the pump chamber, and a second space is preset between the second sliding bearing and the end surface of the second bearing chamber away from the pump chamber; The end surface of the pump cover close to the center bearing is also provided with a concave hole which is recessed in the axial direction. The pump cover is also provided with a second channel which connects the concave hole with the first bearing chamber and a third channel which connects the concave hole with the second bearing chamber.

[0014] The technical solution provided by the present invention has the following advantages: The injection molded outer carrier is coated on the periphery of the inner magnetic skeleton and the first magnet, which can effectively reduce or avoid magnetic leakage. At the same time, the injection molded outer carrier is coated on the periphery of the inner magnetic skeleton and the first magnet and can also reduce the eddy current loss to a certain extent, reduce the influence of the liquid on the inner magnetic assembly, and thus extend the service life of the inner magnetic assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the three-dimensional structure of the pump body provided by the present invention; Figure 2 A schematic diagram of the cross-sectional structure of a pump body provided by the present invention; Figure 3 for Figure 1 Schematic diagram of the decomposition structure; Figure 4 This is a structural diagram of the middle bearing; Figure 5 It is a schematic diagram of the positional relationship between the pump chamber, the driving gear and the driven gear; Figure 6 is a schematic diagram of the structure of the base; Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure of; Figure 8 It is a schematic diagram of the cross-sectional structure between the pump housing, the inner magnetic assembly, and the outer magnetic assembly; Fig. 9 for Figure 8 Schematic diagram of the enlarged structure of the A area in the middle; Fig.10 for Figure 8 Schematic diagram of the enlarged structure of the middle B area; Fig.11 is a schematic structural diagram of a third sliding bearing; Fig.12 is a schematic diagram of the cross-sectional structure of the inner magnetic component; Fig.13 is a cross-sectional schematic diagram of a first magnet; Fig.14 is a schematic diagram of the exploded structure of the external magnetic component; Fig.15 It is an exploded schematic diagram between the adapter plate and the pump housing; Fig.16 It is a schematic diagram of the exploded structure between the isolation cover and the isolation cover and the adapter plate; Fig.17 It is a schematic diagram of the structure of the pump cover; Fig.18 is a cross-sectional schematic diagram of a pump cover; Fig.19 It is a schematic diagram of the liquid flow inside the pump casing and the isolation cover; Fig. 20 It is a schematic diagram of the cross-sectional structure of the sealing structure. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0018] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0019] The present invention provides a pump body, such as Figures 1 to 3 As shown, the pump body includes: a pump housing 100, an isolation cover 200, an inner magnetic assembly 300, an outer magnetic assembly 400 and a motor 500. A pump chamber 140 is formed inside the pump housing 100, and a driving gear 150 and a driven gear 160 that mesh with each other are arranged in the pump chamber 140. The isolation cover 200 is arranged at the end side of the pump housing 100, and a closed space is formed between the end side of the pump housing 100. The inner magnetic assembly 300 is arranged in the closed space and is transmission-connected to the driving gear 150 through a driving shaft 170. The driving gear 150 is connected to the driving shaft 170 through a key, and the driving shaft 170 extends from the pump housing 100 to the isolation cover 200. The outer magnetic assembly 400 is arranged on the outer periphery of the inner magnetic assembly 300 and is in transmission connection with the motor 500. When the motor 500 is working, the output shaft of the motor 500 drives the outer magnetic assembly 400 to rotate. After the outer magnetic assembly 400 rotates, it drives the inner magnetic assembly 300 and the driving shaft 170 to rotate, thereby driving the driving gear 150 and the driven gear 160 to rotate. The pump housing 100 has a liquid inlet 131 and a liquid outlet 132 connected to the pump chamber 140. When the driving gear 150 drives the driven gear 160 to rotate, the external liquid is sucked into the liquid inlet 131 and finally discharged from the pump housing 100 through the liquid outlet 132.

[0020] In order to facilitate disassembly and assembly, the pump housing 100 is detachably arranged in the axial direction. The "axial direction" in this embodiment refers to the axial direction of the drive shaft 170 or the direction parallel to the axial direction of the drive shaft 170. The pump housing 100 includes a base 110 matched with the isolation cover 200, a middle support 120 arranged on the side of the base 110 away from the isolation cover 200, and a pump cover 130 arranged on the side of the middle support 120 away from the base 110. The base 110, the middle support 120 and the pump cover 130 are detachably connected.

[0021] In one embodiment, if Figures 3 to 5As shown, the pump cover 130 is provided with the above-mentioned liquid inlet 131 and liquid discharge port 132. A pump chamber 140 is formed on the middle bearing 120. The pump chamber 140 includes a first chamber 141 accommodating a driving gear 150, a second chamber 142 accommodating a driven gear 160, a third chamber 143 directly opposite to the liquid inlet 131, and a fourth chamber 144 directly opposite to the liquid discharge port 132. The first chamber 141 is connected to the second chamber 142, and the third chamber 143 and the fourth chamber 144 are separated by the meshing line between the driving gear 150 and the driven gear 160. When the driving gear 150 and the driven gear 160 rotate, as shown in FIG. Figure 5 As shown, the driving gear 150 rotates in the clockwise direction and the driven gear 160 rotates in the counterclockwise direction, and the volume of the third chamber 143 on the side where the driving gear 150 and the driven gear 160 are disengaged changes from small to large, forming a vacuum to suck in external liquid, and the volume of the fourth chamber 144 on the side where the driving gear 150 and the driven gear 160 are meshed changes from large to small, thereby squeezing the liquid out of the fourth chamber 144.

[0022] like Figures 6 to 8 As shown, the base 110 is provided with a first channel 113 connecting the pump chamber 140 and the isolation cover 200. The pressure in the pump chamber 140 is greater than the pressure in the isolation cover 200. The liquid flows from high pressure to low pressure. The liquid in the pump chamber 140 enters the isolation cover 200 through the first channel 113, the purpose is to take away the heat in the isolation cover 200, and realize the heat dissipation and cooling of the internal magnetic assembly 300. Among them, the projection of the first channel 113 along the axial direction is located in the meshing area of ​​the driving gear 150 and the driven gear 160, so as to facilitate the liquid in the fourth chamber 144 to enter the first channel 113.

[0023] The base 110 is further provided with a through hole 114 for the drive shaft 170 to pass through. A pair of third sliding bearings 172 are arranged in the through hole 114 along the axial direction. The drive shaft 170 is arranged in the through hole 114 through the pair of third sliding bearings 172. The pair of third sliding bearings 172 is used to support the drive shaft 170.

[0024] The inner ring of the third sliding bearing 172 is fitted with the drive shaft 170, and a liquid circulation loop is formed among the pump chamber 140, the first channel 113, the enclosed space of the isolation cover 200, and the gap between the inner ring of the third sliding bearing 172 and the drive shaft 170. The liquid in the isolation cover 200 can flow back into the pump chamber 140 through the gap between the inner ring of the third sliding bearing 172 and the drive shaft 170, lubricating the third sliding bearing 172 while taking away the heat generated between the third sliding bearing 172 and the drive shaft 170.

[0025] like Fig.10 and Fig.11As shown, the inner ring of the third sliding bearing 172 is provided with a guide groove 1721 extending in the axial direction, and the guide grooves 1721 on a pair of the third sliding bearings 172 are located on the extension line of the same straight line. The guide groove 1721 can guide the liquid to flow to the pump chamber 140 on the one hand, and can also increase the amount of liquid between the inner ring of the third sliding bearing 172 and the drive shaft 170 on the other hand, further improving the lubrication and cooling effect. The two guide grooves 1721 are located on the same straight line for the purpose of shortening the passage time of the liquid in the third sliding bearing 172 to facilitate the circulation of the liquid.

[0026] There is a first spacing K between the pair of third sliding bearings 172 in the axial direction. The first spacing K enables a liquid storage space to exist between the pair of third sliding bearings 172 , thereby increasing the amount of liquid flowing between the pair of third sliding bearings 172 .

[0027] Furthermore, a thread groove is provided on the hole wall of the through hole 114, and the thread groove extends from one end of the through hole 114 to the other end. In other words, the thread groove is distributed on the hole wall of the entire through hole 114. The thread groove is a single-line thread groove, and the first spacing K is greater than the pitch of the thread groove, so that the thread groove and the first spacing K can form a liquid storage space with a larger volume. In this embodiment, the liquid in the isolation cover 200 can flow back to the pump chamber 140 through the thread groove, and can also flow back to the pump chamber 140 through the gap between the third sliding bearings 172. The thread groove can also speed up the flow speed of the liquid to a certain extent, and the circulation efficiency of the liquid is high.

[0028] like Figure 2 and Figure 8 As shown, the isolation cover 200 is arranged on the end side of the pump housing 100 through the adapter plate 210, the side of the adapter plate 210 away from the pump housing 100 is connected to the cover 510, the external magnetic assembly 400 is located in the cover 510, and the housing of the motor 500 is connected to the cover 510. By providing the adapter plate 210, the pump housing 100, the isolation cover 200 and the motor 500 can be installed, which has the advantage of convenient disassembly and assembly.

[0029] like Figure 8 , Fig. 9 , Fig.15 and Fig.16As shown, the isolation cover 200 has an open end, and the open end is provided with a pressure edge 201 folded outward. The end surface of the pump housing 100 is provided with a first groove 111 for cooperating with the pressure edge 201, and the first groove 111 is annular. A sealing structure 112 is provided in the first groove 111, and the pressure edge 201 is clamped between the sealing structure 112 and the adapter plate 210. The above-mentioned setting method can better achieve the connection and sealing between the isolation cover 200 and the pump housing 100. There is no need to open a hole on the isolation cover 200, which enhances the structural strength of the isolation cover 200 to a certain extent. And the adapter plate 210 limits the isolation cover 200 in the entire circumferential direction of the isolation cover 200, and the overall force performance of the isolation cover 200 is good. The cooperation between the first groove 111, the sealing structure 112 and the adapter plate 210 can achieve the effect of "labyrinth" sealing, and the overall sealing effect is good.

[0030] Specifically, Figure 8 , Fig. 9 and Fig. 20 As shown, the sealing structure 112 is annular, and includes a first flexible rubber ring 1121, a second flexible rubber ring 1124, a first hard rubber ring 1122, and a second hard rubber ring 1123. The hardness of the first flexible rubber ring 1121 and the second flexible rubber ring 1124 is less than that of the first hard rubber ring 1122 and the second hard rubber ring 1123.

[0031] The first flexible rubber ring 1121 is annular, the first hard rubber ring 1122 and the second hard rubber ring 1123 are arranged on the outer periphery of the first flexible rubber ring 1121, and the second flexible rubber ring 1124 is arranged on the outer periphery of the first hard rubber ring 1122 and the second hard rubber ring 1123. The first hard rubber ring 1122 is closer to the pressing edge 201 than the second hard rubber ring 1123.

[0032] There is a first gap 1125 between the first hard rubber ring 1122 and the second hard rubber ring 1123 in the axial direction of the first flexible rubber ring 1121. A spring 1126 is provided in the receiving space formed by the first flexible rubber ring 1121, the second flexible rubber ring 1124, the first hard rubber ring 1122 and the second hard rubber ring 1123. The spring 1126 is located in the first gap 1125. One end of the spring 1126 abuts against the first hard rubber ring 1122, and the other end abuts against the second hard rubber ring 1123.

[0033] The first flexible rubber ring 1121 and the second flexible rubber ring 1124 have the same length in the axial direction, and the end of the first flexible rubber ring 1121 is flush with the end of the second flexible rubber ring 1124. The first flexible rubber ring 1121 and the second flexible rubber ring 1124 are in contact with the groove wall of the groove 111, respectively. Specifically, the inner peripheral wall of the first flexible rubber ring 1121 is in contact with the groove wall of the groove 111, and the outer peripheral wall of the second flexible rubber ring 1124 is in contact with the groove wall of the groove 111.

[0034] The first hard rubber ring 1122, the second hard rubber ring 1123 and the spring 1126 are located in a space sandwiched by the first flexible rubber ring 1121 and the second flexible rubber ring 1124. The axial length of the first flexible rubber ring 1121 is greater than the sum of the axial lengths of the first hard rubber ring 1122 and the second hard rubber ring 1123.

[0035] After the adapter plate 210 is installed on the pump housing 100, the sealing structure 112 is pressed into the first groove 111. At this time, the sealing structure 112 is subjected to an axial force parallel to the drive shaft 170, and the first flexible rubber ring 1121 and the second flexible rubber ring 1124 are deformed under pressure, so that the axial dimensions of the first flexible rubber ring 1121 and the second flexible rubber ring 1124 are reduced, while the radial dimensions are expanded outward.

[0036] After the radial dimensions of the first flexible rubber ring 1121 and the second flexible rubber ring 1124 are expanded outward, the first flexible rubber ring 1121 and the first hard rubber ring 1122, the second hard rubber ring 1123, the first flexible rubber ring 1121 and the groove wall of the first groove 111, the second flexible rubber ring 1124 and the first hard rubber ring 1122, the second hard rubber ring 1123, and the second flexible rubber ring 1124 and the groove wall of the first groove 111 will be in closer contact, thereby effectively preventing the liquid in the isolation cover 200 from leaking out through the first groove 111.

[0037] Since the hardness of the first hard rubber ring 1122 and the second hard rubber ring 1123 is greater than the hardness of the first flexible rubber ring 1121 and the second flexible rubber ring 1124 , the first hard rubber ring 1122 and the second hard rubber ring 1123 will not deform and maintain their original appearance, thereby ensuring the structural strength of the sealing structure 112 .

[0038] The spring 1126 can make the first hard rubber ring 1122 abut against the pressure edge 201 of the isolation cover 200. The spring 1126 can also make the second hard rubber ring 1123 abut against the groove bottom of the first groove 111. Thus, the sealing performance of the isolation cover 200 is guaranteed.

[0039] Furthermore, the isolation cover 200 has only the inner magnetic assembly 300 fixed on the driving shaft 170 . The structure inside the isolation cover 200 is simple and has no bearing assembly, which effectively simplifies the structure of the circulation loop and is conducive to miniaturization of the isolation cover 200 .

[0040] like Fig.12 and Fig.13 As shown, the inner magnetic assembly 300 includes an annular inner magnetic frame 320, a first magnet 330 disposed on the outer periphery of the inner magnetic frame 320, and an injection molded outer carrier 310 covering the inner magnetic frame 320 and the outer periphery of the first magnet 330. A connection hole 311 for cooperating with the drive shaft 170 is formed in the center of the injection molded outer carrier 310, and a cavity for accommodating the inner magnetic frame 320 and the first magnet 330 is formed inside the injection molded outer carrier 310, and the cavity is arranged around the outer periphery of the connection hole 311. The first magnet 330 includes a plurality of magnetic blocks 331, and the plurality of magnetic blocks 331 are spliced ​​into a circular ring, and the magnetism of adjacent magnetic blocks 331 is opposite.

[0041] The injection molded outer carrier 310 is made of plastic material, preferably, the material of the injection molded outer carrier 310 is polyetheretherketone (PEEK). The injection molded outer carrier 310 adopts the injection molding process, and by arranging the injection molded outer carrier 310 on the periphery of the inner magnetic skeleton 320 and the first magnet 330, the wrapping property of the first magnet 330 can be increased, and it is not easy to slip off from the inner magnetic skeleton 320, and there will be no problem of magnetic leakage.

[0042] The injection molded outer carrier 310 is sleeved on one end side of the drive shaft 170, wherein the injection molded outer carrier 310 is also provided with a tail hole 312 coaxially distributed with the connection hole 311 and having a smaller aperture than the connection hole 311, and a shoulder structure for axially limiting the drive shaft 170 is formed between the connection hole 311 and the tail hole 312. The liquid in the isolation cover 200 can also cool the inner magnetic assembly 300 through the tail hole 312, and the cooling effect is good.

[0043] like Fig.14 As shown, the external magnetic assembly 400 includes a mounting sleeve 410 fixed on the output shaft of the motor 500, an outer magnetic frame 420 fixed to the inner ring of the mounting sleeve 410, and a second magnet 430 fixed to the inner ring of the outer magnetic frame 420, wherein the outer magnetic frame 420 and the mounting sleeve 410 are connected by fasteners, and the fasteners are configured to fasten the mounting sleeve 410 to the outer magnetic frame 420 from the outside, which has the advantage of easy disassembly and assembly.

[0044] like Figure 8 , Figures 17 to 19As shown, the driven gear 160 is rotatably arranged in the pump housing 100 through the driven shaft 180, wherein the end surface of the pump cover 130 close to the middle bearing 120 has a first bearing chamber 133 and a second bearing chamber 134 which are recessed along the axial direction, and the first bearing chamber 133 is provided with a first sliding bearing 171 for supporting the drive shaft 170, and the second bearing chamber 134 is provided with a second sliding bearing 181 for supporting the driven shaft 180, and a first space H1 is preset between the first sliding bearing 171 and the end surface of the first bearing chamber 133 away from the pump chamber 140, and a second space H2 is preset between the second sliding bearing 181 and the end surface of the second bearing chamber 134 away from the pump chamber 140.

[0045] The end surface of the pump cover 130 close to the middle bearing 120 also has a concave hole 135 that is recessed in the axial direction. The pump cover 130 is also provided with a second channel 136 connecting the concave hole 135 and the first bearing chamber 133, and a third channel 137 connecting the concave hole 135 and the second bearing chamber 134. The liquid in the pump chamber 140 can enter the second channel 136 and the third channel 137 through the concave hole 135, and finally flow to the first space H1 and the second space H2. The liquid in the first space H1 can flow back to the pump chamber 140 through the gap between the inner ring of the first sliding bearing 171 and the driving shaft 170. The liquid in the second space H2 can flow back to the pump chamber 140 through the gap between the driven shaft 180 and the second sliding bearing 181.

[0046] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the present invention.

Claims

1. A pump body, characterized in that: include: A pump housing (100) having a pump chamber (140) formed therein; the pump housing (100) is further provided with a liquid inlet (131) and a liquid outlet (132) in communication therewith; and a driving gear (150) and a driven gear (160) meshing with each other are provided in the pump chamber (140); An isolation cover (200) is disposed on an end side of the pump housing (100) and forms a closed space with the end side of the pump housing (100); An internal magnetic assembly (300) is disposed in the enclosed space and is drivingly connected to the driving gear (150) via a driving shaft (170), wherein the driving shaft (170) extends from the pump housing (100) into the isolation cover (200); An external magnetic component (400) is arranged on the outer periphery of the internal magnetic component (300) and is drivingly connected to the motor (500); The inner magnetic component (300) comprises an annular inner magnetic skeleton (320), a first magnet (330) arranged on the outer periphery of the inner magnetic skeleton (320), and an injection molded outer carrier (310) covering the inner magnetic skeleton (320) and the outer periphery of the first magnet (330), wherein a connecting hole (311) for cooperating with the drive shaft (170) is formed in the center of the injection molded outer carrier (310), and a cavity for accommodating the inner magnetic skeleton (320) and the first magnet (330) is formed inside the injection molded outer carrier (310), and the cavity is arranged around the outer periphery of the connecting hole (311).

2. The pump body according to claim 1, characterized in that: The isolation cover (200) contains and only contains the inner magnetic component (300) fixedly mounted on the drive shaft (170).

3. The pump body according to claim 2, characterized in that: The injection-molded outer carrier (310) is sleeved on one end side of the drive shaft (170), wherein the injection-molded outer carrier (310) is further provided with a tail hole coaxially distributed with the connecting hole (311) and having a smaller hole diameter than the connecting hole (311), and a shoulder structure for axially limiting the drive shaft (170) is formed between the connecting hole (311) and the tail hole.

4. The pump body according to claim 1, characterized in that: The external magnetic assembly (400) includes a mounting sleeve (410) fixedly mounted on the output shaft of the motor (500), an external magnetic frame (420) fixedly mounted on the inner ring of the mounting sleeve (410), and a second magnet (430) fixedly mounted on the inner ring of the external magnetic frame (420), wherein the external magnetic frame (420) and the mounting sleeve (410) are connected via fasteners, and the fasteners are configured to fasten the mounting sleeve (410) to the external magnetic frame (420) from the outside of the mounting sleeve (410).

5. The pump body according to claim 1, characterized in that: The isolation cover (200) is arranged on the end side of the pump housing (100) via an adapter plate (210); a side of the adapter plate (210) away from the pump housing (100) is connected to a cover shell (510); the external magnetic component (400) is located in the cover shell (510); and a housing of the motor (500) is connected to the cover shell (510).

6. The pump body according to claim 5, characterized in that: The isolation cover (200) has an open end, and the open end is provided with a pressing edge (201) folded outwards. The end surface of the pump housing (100) is provided with a first groove (111) for cooperating with the pressing edge (201). A sealing structure (112) is provided in the first groove (111). The pressing edge (201) is sandwiched between the sealing structure (112) and the adapter plate (210).

7. The pump body according to claim 6, characterized in that: The sealing structure (112) comprises a first flexible rubber ring (1121), a first hard rubber ring (1122) and a second hard rubber ring (1123) arranged on the periphery of the first flexible rubber ring (1121), and a second flexible rubber ring (1124) arranged on the periphery of the first hard rubber ring (1122) and the second hard rubber ring (1123); wherein the first hard rubber ring (1122) is closer to the pressure edge (201) than the second hard rubber ring (1123); a first gap (1125) exists between the first hard rubber ring (1122) and the second hard rubber ring (1123) in the axial direction of the first flexible rubber ring (1121); a spring (1126) is provided in a receiving space formed by the first flexible rubber ring (1121), the second flexible rubber ring (1124), the first hard rubber ring (1122) and the second hard rubber ring (1123); the spring (1126) is located in the first gap (1125); one end of the spring (1126) abuts against the first hard rubber ring (1122) and the other end abuts against the second hard rubber ring (1123); The first flexible rubber ring (1121) and the second flexible rubber ring (1124) are of equal length in the axial direction, and the end of the first flexible rubber ring (1121) is flush with the end of the second flexible rubber ring (1124), the first flexible rubber ring (1121) and the second flexible rubber ring (1124) are in contact with the groove wall of the groove (111), respectively, and the first hard rubber ring (1122), the second hard rubber ring (1123) and the spring (1126) are located in a space sandwiched by the first flexible rubber ring (1121) and the second flexible rubber ring (1124); The length of the first flexible rubber ring (1121) in the axial direction is greater than the sum of the lengths of the first hard rubber ring (1122) and the second hard rubber ring (1123) in the axial direction.

8. The pump body according to claim 1, characterized in that: The pump housing (100) comprises a base (110) matched with the isolation cover (200), a middle support (120) arranged on a side of the base (110) away from the isolation cover (200), and a pump cover (130) arranged on a side of the middle support (120) away from the base (110); the base (110), the middle support (120) and the pump cover (130) are detachably connected; A pump cavity (140) is formed on the middle bearing (120); the base (110) is provided with a first channel (113) connecting the pump cavity (140) and the isolation cover (200); the base (110) is further provided with a through hole (114) for the drive shaft (170) to pass through; a pair of third sliding bearings (172) distributed along the axial direction are provided in the through hole (114); the drive shaft (170) is arranged in the through hole (114) through the pair of third sliding bearings (172); and a first spacing K is present between the pair of third sliding bearings (172) in the axial direction; The inner ring of the third sliding bearing (172) is provided with a guide groove (1721) extending in the axial direction, and the axial projection of the first channel (113) is located in the meshing area of ​​the driving gear (150) and the driven gear (160); and the hole wall of the through hole (114) is provided with a thread groove.

9. The pump body according to claim 8, characterized in that: The pump cover (130) is provided with the liquid inlet (131) and the liquid outlet (132); The pump chamber (140) comprises a first chamber (141) accommodating the driving gear (150), a second chamber (142) accommodating the driven gear (160), a third chamber (143) directly opposite the liquid inlet (131), and a fourth chamber (144) directly opposite the liquid discharge port (132), wherein the first chamber (141) is communicated with the second chamber (142), and the third chamber (143) and the fourth chamber (144) are separated by a meshing line between the driving gear (150) and the driven gear (160).

10. The pump body according to claim 8, characterized in that The driven gear (160) is rotatably arranged in the pump housing (100) via a driven shaft (180), wherein the end surface of the pump cover (130) close to the middle bearing (120) has a first bearing chamber (133) and a second bearing chamber (134) which are recessed in the axial direction, the first bearing chamber (133) is provided with a first sliding bearing (171) for supporting the drive shaft (170), the second bearing chamber (134) is provided with a second sliding bearing (181) for supporting the driven shaft (180), a first space H1 is preset between the first sliding bearing (171) and the end surface of the first bearing chamber (133) away from the pump chamber (140), and a second space H2 is preset between the second sliding bearing (181) and the end surface of the second bearing chamber (134) away from the pump chamber (140); The pump cover (130) has an axially recessed concave hole (135) on its end surface close to the center bearing (120). The pump cover (130) is also provided with a second channel (136) connecting the concave hole (135) and the first bearing chamber (133), and a third channel (137) connecting the concave hole (135) and the second bearing chamber (134).

Images