Composite multi-stage shielding fluorine pump

Abstract

The invention discloses a combined type multi-stage shielding fluorine pump, and relates to the technical field of shielding pumps. The pump comprises a pump body, a motor, a first acting assembly and a second acting assembly, the motor is arranged in the pump body and at least comprises a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are coaxially arranged, and an overflowing gap is formed between the stator assembly and the rotor assembly; the rotor assembly is coaxially connected with the first acting assembly and the second acting assembly through a main shaft, the first acting assembly comprises a first inner gear and a first outer gear, and the second acting assembly comprises a second inner gear, a second outer gear or an impeller and a guide vane. According to the combined type multi-stage shielding fluorine pump, through the coaxial design of the inner gear and the rotor assembly, the length of the main shaft is effectively shortened, the overall size of the pump is reduced, the special structures of the stator assembly and the rotor assembly are utilized, the dynamic sealing problem is solved, and the circulating heat dissipation function is achieved. And the lift is increased in a limited space through the acting assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of shielded pumps, and in particular relates to a composite multi-stage shielded fluorine pump. Background Art

[0002] Gear pumps are commonly used in the field of pumps because of their simple structure, small number of parts and low processing difficulty. Therefore, they are suitable for miniaturization and are conducive to controlling production costs. Compared with centrifugal pumps, gear pumps have more stable and efficient working performance in the range of small flow and high head. They are more suitable as medium circulation components in working scenarios such as data center cooling, energy storage battery cooling and household cooling, and can achieve better energy-saving effects.

[0003] Since the traditional gear pump adopts a structure in which the gear set and the motor are separated, there are problems with the connection between the gear shaft and the motor shaft and the unreliable dynamic seal of the shaft, which greatly affects the performance and reliability of the gear pump, and easily leads to serious wear of rotating parts such as gears, bearings, and shafts, and is also prone to leakage of the medium. At the same time, the heat dissipation performance of the motor is also poor; although the existing magnetic drive gear pump solves the problem of easy leakage of the dynamic seal of the pump shaft, the size of the pump is significantly increased due to the magnetic connection structure, and it still cannot effectively solve the problem of poor heat dissipation performance of the motor; in addition, although the general single-stage gear pump can reduce its own volume, it cannot solve the problem of insufficient head. To this end, we provide a composite multi-stage shielded fluorine pump to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a composite multi-stage shielded fluorine pump, which solves the above-mentioned problems in the background technology through the specific structural design of the pump body, the first working component, the second working component and the motor.

[0005] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: The present invention is a composite multi-stage shielded fluorine pump, including a pump body and a motor, the front end of the pump body is provided with a liquid inlet, and the rear end of the pump body is provided with a liquid outlet; the motor includes a stator assembly and a rotor assembly arranged coaxially, and the rotor assembly is fixedly mounted on a main shaft connected to the output end of the motor; a first working assembly and a second working assembly are arranged between the two sides of the motor inside the pump body, the first working assembly is arranged near the front end of the pump body, and the second working assembly is arranged near the rear end of the pump body, and the main shaft is used to control the synchronous rotation between the first working assembly, the rotor assembly and the second working assembly.

[0006] A flow gap is formed between the stator component and the rotor component, a medium flow channel is arranged between the first working component and the second working component, the medium flow channel and the flow gap are arranged coaxially and the two are connected; when the shielded fluorine pump is working, the changing magnetic field generated by the energization of the stator component drives the rotor component to rotate, and the synchronous rotation of the first working component and the second working component is controlled under the linkage action of the main shaft, and the first working component and the second working component work on the conveying medium at the same time, so that the conveying medium enters from the liquid inlet and flows out from the liquid outlet along the medium flow channel and the flow gap.

[0007] The present invention is further configured as follows: the pump body includes a pump head, a front bearing seat, a casing barrel, a rear bearing seat and a pump tail; wherein, the pump head is fixedly mounted on the front end of the casing barrel, the pump tail is fixedly mounted on the rear end of the casing barrel, the front bearing seat is fixedly mounted on the inside of the casing barrel and is arranged corresponding to the pump head, and the rear bearing seat is fixedly mounted on the inside of the casing barrel and is arranged corresponding to the pump tail.

[0008] The liquid inlet is arranged on the pump head, and the liquid outlet is arranged on the pump tail; the front bearing seat is provided with a front bearing hole and a front flow cavity, and a front bearing connected to the main shaft is fixedly installed inside the front bearing hole; the rear bearing seat is provided with a rear bearing hole and a rear flow cavity, and a rear bearing connected to the main shaft is fixedly installed inside the rear bearing hole, and flow grooves are arranged on the inner walls of the front bearing and the rear bearing, and the flow grooves are arranged in a straight line or spiral shape.

[0009] The present invention is further configured as follows: the first working component includes an internal gear 1, an external gear 1, a gear front cover plate 1, a gear cavity 1 and a gear rear cover plate 1; wherein, the gear rear cover plate 1 fits tightly on the front bearing seat, the gear front cover plate 1 and the gear rear cover plate 1 are both coaxially mounted inside the pump head, and the front flow cavity is the same size as the gear rear cover plate 1; the gear cavity 1 is arranged between the gear front cover plate 1 and the gear rear cover plate 1, the external gear 1 is rotatably arranged inside the gear cavity 1, the internal gear 1 is arranged inside the external gear 1 and the two are meshed, and the internal gear 1 is fixedly mounted on the main shaft.

[0010] The present invention is further configured such that the second working assembly includes an internal gear 2, an external gear 2, a gear front cover plate 2, a gear cavity 2 and a gear rear cover plate 2; wherein, the gear rear cover plate 2 is tightly fitted on the rear bearing seat, the gear front cover plate 2 and the gear rear cover plate 2 are both coaxially mounted inside the pump tail, and the rear flow cavity is the same size as the gear rear cover plate 2; the gear cavity 2 is arranged between the gear front cover plate 2 and the gear rear cover plate 2, the external gear 2 is rotatably arranged inside the gear cavity 2, the internal gear 2 is arranged inside the external gear 2 and the two are meshed, and the internal gear 2 is fixedly mounted on the main shaft.

[0011] The present invention is further configured as follows: an oil suction chamber is provided on the gear front cover plate 1, and an oil pressure chamber is provided on the gear rear cover plate 1; an oil suction chamber is provided on the gear front cover plate 2, and an oil pressure chamber is provided on the gear rear cover plate 2; a front low-pressure zone is provided on one side of the front bearing seat, and a front high-pressure zone is provided on the other side of the front bearing seat; a rear low-pressure zone is provided on one side of the rear bearing seat, and a rear high-pressure zone is provided on the other side of the front bearing seat.

[0012] The present invention is further configured such that the medium flow channel is composed of a pressure oil chamber one, a front flow chamber, a front high-pressure area, a rear low-pressure area, a rear flow chamber and an oil suction chamber two; wherein one end of the front flow chamber is connected to the front high-pressure area, and the other end of the front flow chamber is connected to the pressure oil chamber one; one end of the rear flow chamber is connected to the rear low-pressure area, and the other end of the rear flow chamber is connected to the oil suction chamber two.

[0013] The present invention is further configured such that the second working assembly comprises an impeller coaxially fixedly mounted on the main shaft, and a plurality of guide vanes are fixedly arranged on the circumferential side of the impeller.

[0014] The present invention is further configured as follows: a stator shielding sleeve is provided on the stator assembly, and the stator shielding sleeve is a stator potting layer formed by potting processing and completely wrapping the stator assembly; a rotor shielding sleeve is provided on the rotor assembly, and the rotor shielding sleeve is a rotor potting layer formed by potting processing and completely wrapping the rotor assembly; and the flow gap is arranged between the stator shielding sleeve and the rotor shielding sleeve.

[0015] The present invention is further configured such that a front thrust bearing seat and a rear thrust bearing seat are respectively fixedly mounted on the main shaft, the rotor assembly is fitted between the front thrust bearing seat and the rear thrust bearing seat, the front thrust bearing seat is mounted with a front thrust bearing, the rear thrust bearing seat is mounted with a rear thrust bearing, the front thrust bearing and the rear thrust bearing are both in compression contact with the inner wall of the pump body to balance the axial force of the main shaft and / or limit the movement range of the main shaft.

[0016] The present invention is further configured such that the gear front cover plate 1, the gear front cover plate 2, the gear rear cover plate 1, the gear rear cover plate 2, the gear cavity 1 and the gear cavity 2 are all covered with a diamond-like carbon coating.

[0017] The present invention has the following beneficial effects: 1. The present invention greatly simplifies the connection between the gear set and the motor by arranging the working component and the motor in the same pump body and fixing the internal gear and the rotor component through the same main shaft, thereby greatly shortening the length of the main shaft. While achieving the purpose of reducing the volume of the pump, it is also beneficial to reduce the vibration of the main shaft to reduce the wear of the gears and bearings, so that the product has a longer service life and higher working reliability, and solves the problem of easy leakage caused by dynamic seals in traditional gear pumps.

[0018] 2. The present invention forms a flow gap connected to the flow channel in the pump body through the cooperation of the stator shielding sleeve and the rotor shielding sleeve. The medium flows through the flow gap to take away the heat generated by the motor, achieving the effect of liquid cooling and heat dissipation, thus solving the heat dissipation problem of traditional motors.

[0019] 3. Under the action of pressure, the medium in the present invention automatically enters the flow channel formed by the bearing hole and the flow groove, thereby utilizing the flow of the medium to spontaneously lubricate the bearings, working components and main shaft, effectively reducing the wear of parts, and facilitating the discharge of impurities in the system, thereby ensuring the stability of product operation. The medium is fixedly connected to the main shaft through the internal gear and adopts a retaining spring structure, which can effectively eliminate the axial force generated by the pump during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the internal structure of a composite multi-stage shielded fluorine pump.

[0022] Figure 2 for Figure 1 A magnified view of the local structure at point A.

[0023] Figure 3 It is a schematic diagram of the structure of the stator potting layer in the present invention.

[0024] Figure 4 It is a schematic diagram of the axial cross-section structure of the pump body in the present invention.

[0025] Figure 5 It is a schematic structural diagram of the first working component in the present invention.

[0026] Figure 6 It is a schematic diagram of the axial cross-section structure of the first working component in the present invention.

[0027] Figure 7It is a schematic diagram of the structure of the pump head in the present invention.

[0028] Figure 8 It is a schematic diagram of the structure of the pump tail in the present invention.

[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1- pump body, 11- pump head, 111- liquid inlet, 112- front low pressure zone, 113- front high pressure zone, 12- front bearing seat, 121- front bearing hole, 122- front flow chamber, 123- front bearing, 124- front thrust bearing, 125- front thrust bearing seat, 13- casing barrel, 14- rear bearing seat, 141- rear bearing hole, 142- rear flow chamber, 143- rear bearing, 144- rear thrust bearing, 145- rear thrust bearing seat, 15- pump tail, 151- liquid outlet, 152- rear low pressure zone, 153- rear high pressure zone, 2- first working component, 21- inner gear Wheel 1, 22-external gear 1, 23-gear front cover 1, 231-oil suction chamber 1, 24-gear chamber 1, 25-gear rear cover 1, 251-oil pressure chamber 1, 26-fixed key 1, 3-second working component, 31-internal gear 2, 32-external gear 2, 33-gear front cover 2, 331-oil pressure chamber 2, 34-gear chamber 2, 35-gear rear cover 2, 351-oil suction chamber 2, 36-fixed key 2, 4-motor, 41-stator assembly, 411-stator shielding sleeve, 42-rotor assembly, 421-rotor shielding sleeve, 422-spindle, 43-flow clearance. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-8 The present invention is a composite multi-stage shielded fluorine pump, comprising a pump body 1 and a motor 4, wherein a liquid inlet 111 is arranged at the front end of the pump body 1, and a liquid outlet 151 is arranged at the rear end of the pump body 1; the motor 4 comprises a stator assembly 41 and a rotor assembly 42 arranged coaxially, and the rotor assembly 42 is fixedly mounted on a main shaft 422 connected to the output end of the motor 4; a first working assembly 2 and a second working assembly 3 are arranged between the two sides of the motor 4 inside the pump body 1, the first working assembly 2 is arranged near the front end of the pump body 1, and the second working assembly 3 is arranged near the rear end of the pump body 1, and the main shaft 422 is used to control the synchronous rotation between the first working assembly 2, the rotor assembly 42 and the second working assembly 3; A flow gap 43 is formed between the stator assembly 41 and the rotor assembly 42, and a medium flow channel is arranged between the first working assembly 2 and the second working assembly 3. The medium flow channel and the flow gap 43 are arranged coaxially and the two are connected; when the shielded fluorine pump is working, the changing magnetic field generated by the power supply of the stator assembly 41 drives the rotor assembly 42 to rotate, and the synchronous rotation of the first working assembly 2 and the second working assembly 3 is controlled under the linkage action of the main shaft 422. The first working assembly 2 and the second working assembly 3 work on the conveying medium at the same time, so that the conveying medium enters from the liquid inlet 111 and flows out from the liquid outlet 151 along the medium flow channel and the flow gap 43.

[0032] In this embodiment of the present invention, the pump body 1 includes a pump head 11, a front bearing seat 12, a casing barrel 13, a rear bearing seat 14 and a pump tail 15; wherein the pump head 11 is fixedly mounted on the front end of the casing barrel 13, the pump tail 15 is fixedly mounted on the rear end of the casing barrel 13, the front bearing seat 12 is fixedly mounted inside the casing barrel 13 and is arranged corresponding to the pump head 11, and the rear bearing seat 14 is fixedly mounted inside the casing barrel 13 and is arranged corresponding to the pump tail 15; the liquid inlet 111 is arranged on the pump head 11, and the liquid outlet 15 1 is arranged on the pump tail 15; the front bearing seat 12 is provided with a front bearing hole 121 and a front flow cavity 122, and a front bearing 123 connected to the main shaft 422 is fixedly installed inside the front bearing hole 121; the rear bearing seat 14 is provided with a rear bearing hole 141 and a rear flow cavity 142, and a rear bearing 143 connected to the main shaft 422 is fixedly installed inside the rear bearing hole 141, and flow grooves are provided on the inner walls of the front bearing 123 and the rear bearing 143, and the flow grooves are arranged in a straight line or spiral shape.

[0033] In this embodiment of the present invention, the first working component 2 includes an internal gear 21, an external gear 22, a gear front cover plate 23 (the gear front cover plate 23 is covered with a diamond-like coating), a gear cavity 24 (the gear cavity 24 is covered with a diamond-like coating) and a gear rear cover plate 25 (the gear rear cover plate 25 is covered with a diamond-like coating); wherein, the gear rear cover plate 25 is tightly fitted on the front bearing seat 12, the gear front cover plate 23 and the gear rear cover plate 25 are both coaxially installed inside the pump head 11, and the front flow chamber 122 is the same size as the gear rear cover plate 25; the gear cavity 24 is arranged between the gear front cover plate 23 and the gear rear cover plate 25, the external gear 22 is rotatably arranged inside the gear cavity 24, the internal gear 21 is arranged inside the external gear 22 and the two are meshed, and the internal gear 21 is fixedly installed on the main shaft 422.

[0034] In this embodiment of the present invention, the second working assembly 3 includes an internal gear 2 31, an external gear 2 32, a gear front cover plate 2 33 (the gear front cover plate 2 33 is covered with a diamond-like coating), a gear cavity 2 34 (the gear cavity 2 34 is covered with a diamond-like coating) and a gear rear cover plate 2 35 (the gear rear cover plate 2 35 is covered with a diamond-like coating); wherein, the gear rear cover plate 2 35 is tightly fitted on the rear bearing seat 14, the gear front cover plate 2 33 and the gear rear cover plate 2 35 are both coaxially installed inside the pump tail 15, and the rear flow cavity 142 is the same size as the gear rear cover plate 2 35; the gear cavity 2 34 is arranged between the gear front cover plate 2 33 and the gear rear cover plate 2 35, the external gear 2 32 is rotatably arranged inside the gear cavity 2 34, the internal gear 2 31 is arranged inside the external gear 2 32 and the two are meshed, and the internal gear 2 31 is fixedly installed on the main shaft 422.

[0035] In this embodiment, the second working assembly 3 can also be configured as follows: the second working assembly 3 includes an impeller coaxially fixedly mounted on the main shaft 422, and a plurality of guide vanes are fixedly arranged on the circumferential side of the impeller.

[0036] In this embodiment of the present invention, an oil suction chamber 231 is provided on the gear front cover plate 23, and an oil pressure chamber 251 is provided on the gear rear cover plate 25; an oil suction chamber 351 is provided on the gear front cover plate 33, and an oil pressure chamber 331 is provided on the gear rear cover plate 35; a front low-pressure zone 112 is provided on one side of the front bearing seat 12, and a front high-pressure zone 113 is provided on the other side of the front bearing seat 12; a rear low-pressure zone 152 is provided on one side of the rear bearing seat 14, and a rear high-pressure zone 153 is provided on the other side of the front bearing seat 12.

[0037] In this embodiment of the present invention, the medium flow channel is composed of an oil pressure chamber 251, a front flow chamber 122, a front high pressure area 113, a rear low pressure area 152, a rear flow chamber 142 and an oil suction chamber 351; wherein, one end of the front flow chamber 122 is connected to the front high pressure area 113, and the other end of the front flow chamber 122 is connected to the oil pressure chamber 251; one end of the rear flow chamber 142 is connected to the rear low pressure area 152, and the other end of the rear flow chamber 142 is connected to the oil suction chamber 351.

[0038] In this embodiment of the present invention, a stator shielding sleeve 411 is provided on the stator assembly 41, and the stator shielding sleeve 411 is a stator potting layer formed by potting processing and completely wrapping the stator assembly 41; a rotor shielding sleeve 421 is provided on the rotor assembly 42, and the rotor shielding sleeve 421 is a rotor potting layer formed by potting processing and completely wrapping the rotor assembly 42; and a flow gap 43 is provided between the stator shielding sleeve 411 and the rotor shielding sleeve 421.

[0039] In this embodiment of the present invention, a front thrust bearing seat 125 and a rear thrust bearing seat 145 are respectively fixedly mounted on the main shaft 422, and the rotor assembly 42 is snugly arranged between the front thrust bearing seat 125 and the rear thrust bearing seat 145. A front thrust bearing 124 is mounted on the front thrust bearing seat 125, and a rear thrust bearing 144 is mounted on the rear thrust bearing seat 145. The front thrust bearing 124 and the rear thrust bearing 144 are both in compression contact with the inner wall of the pump body 1 to balance the axial force of the main shaft 422 and / or limit the movement range of the main shaft 422.

[0040] When the pump is working, the stator assembly 41 is energized to generate a changing magnetic field and drive the rotor assembly 42 to rotate, so that the main shaft 422 rotates with the rotor assembly 42 and drives the inner gear 1 21 and the inner gear 2 31 to rotate, the inner gear 1 21 meshes with the outer gear 1 22 to rotate, the inner gear 2 31 meshes with the outer gear 2 32 to rotate, the first working assembly 2 works on the medium and forms a high-pressure medium in the front high-pressure area 113, a part of the medium in the front high-pressure area 113 is discharged to the rear low-pressure area 152 through the flow gap 43, and then the second working assembly 3 works on the medium, and the medium is discharged from the rear low-pressure area 152. The low-pressure area 152 is discharged to the high-pressure area 153 at the outlet 151; a part flows through the front bearing hole 121 and the rear bearing hole 141 and lubricates and cools the main shaft 422, the front bearing 123, the rear bearing 143, the front thrust bearing 124 and the rear thrust bearing 144; another part flows to the matching gaps of each component and is used to discharge the gas accumulated in the pump, thereby preventing cavitation during the operation of the pump. The medium is in direct contact with the motor 4, which is beneficial to the heat dissipation of the motor, improves the self-lubricating ability of the equipment, and effectively prevents the wear of the front bearing 123 and the rear bearing 143.

[0041] By arranging the first working assembly 2, the second working assembly 3 and the motor 4 between the pump body 1, and fixing the internal gear 1 21, the internal gear 2 31 and the rotor assembly 42 through the same main shaft 422, the connection between the first working assembly 2, the second working assembly 3 and the motor 4 is greatly simplified, so that the length of the main shaft 422 is greatly shortened, while achieving the purpose of reducing the volume of the pump, it is also beneficial to reduce the vibration of the main shaft 422, so as to reduce the wear of the gears and bearings, so that the product has a longer service life and higher working reliability, and solves the problem of easy leakage caused by dynamic seals in traditional gear pumps.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0043] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A composite multi-stage shielded fluorine pump, comprising a pump body (1) and a motor (4), wherein the front end of the pump body (1) is provided with a liquid inlet (111), and the rear end of the pump body (1) is provided with a liquid outlet (151); the motor (4) comprises a stator assembly (41) and a rotor assembly (42) arranged coaxially, and the rotor assembly (42) is fixedly mounted on a main shaft (422) connected to the output end of the motor (4); Features: A first working component (2) and a second working component (3) are arranged inside the pump body (1) between two sides of the motor (4); the first working component (2) is arranged near the front end of the pump body (1), and the second working component (3) is arranged near the rear end of the pump body (1); the main shaft (422) is used to control the synchronous rotation between the first working component (2), the rotor component (42) and the second working component (3); A flow gap (43) is formed between the stator assembly (41) and the rotor assembly (42), a medium flow channel is provided between the first working assembly (2) and the second working assembly (3), and the medium flow channel and the flow gap (43) are coaxially arranged and communicated with each other; When the shielded fluorine pump is working, the changing magnetic field generated by the energization of the stator assembly (41) drives the rotor assembly (42) to rotate, and the first working assembly (2) and the second working assembly (3) are controlled to rotate synchronously under the linkage action of the main shaft (422). The first working assembly (2) and the second working assembly (3) simultaneously work on the conveying medium, so that the conveying medium enters from the liquid inlet (111) and flows out from the liquid outlet (151) along the medium flow channel and the flow gap (43).

2. A composite multi-stage shielded fluorine pump according to claim 1, characterized in that: The pump body (1) comprises a pump head (11), a front bearing seat (12), a casing barrel (13), a rear bearing seat (14) and a pump tail (15); wherein the pump head (11) is fixedly mounted at the front end of the casing barrel (13), the pump tail (15) is fixedly mounted at the rear end of the casing barrel (13), the front bearing seat (12) is fixedly mounted inside the casing barrel (13) and is arranged corresponding to the pump head (11), and the rear bearing seat (14) is fixedly mounted inside the casing barrel (13) and is arranged corresponding to the pump tail (15); The liquid inlet (111) is arranged on the pump head (11), and the liquid outlet (151) is arranged on the pump tail (15); the front bearing seat (12) is provided with a front bearing hole (121) and a front flow cavity (122), and a front bearing (123) connected to the main shaft (422) is fixedly installed inside the front bearing hole (121); the rear bearing seat (14) is provided with a rear bearing hole (141) and a rear flow cavity (142), and a rear bearing (143) connected to the main shaft (422) is fixedly installed inside the rear bearing hole (141), and flow grooves are provided on the inner walls of the front bearing (123) and the rear bearing (143), and the flow grooves are arranged in a straight line or spiral shape.

3. A composite multi-stage shielded fluorine pump according to claim 2, characterized in that: The first working assembly (2) comprises an inner gear (21), an outer gear (22), a gear front cover plate (23), a gear cavity (24) and a gear rear cover plate (25); wherein the gear rear cover plate (25) is tightly fitted on the front bearing seat (12), the gear front cover plate (23) and the gear rear cover plate (25) are coaxially mounted inside the pump head (11), and the front flow cavity (122) is the same size as the gear rear cover plate (25); The gear chamber 1 (24) is arranged between the gear front cover plate 1 (23) and the gear rear cover plate 1 (25); the outer gear 1 (22) is rotatably arranged inside the gear chamber 1 (24); the inner gear 1 (21) is arranged inside the outer gear 1 (22) and the two are meshed; the inner gear 1 (21) is fixedly mounted on the main shaft (422).

4. A composite multi-stage shielded fluorine pump according to claim 3, characterized in that: The second working assembly (3) comprises an inner gear (31), an outer gear (32), a gear front cover (33), a gear cavity (34) and a gear rear cover (35); wherein the gear rear cover (35) is tightly fitted on the rear bearing seat (14), the gear front cover (33) and the gear rear cover (35) are coaxially mounted inside the pump tail (15), and the rear flow cavity (142) is the same size as the gear rear cover (35); The second gear chamber (34) is arranged between the second gear front cover plate (33) and the second gear rear cover plate (35); the second external gear (32) is rotatably arranged inside the second gear chamber (34); the second internal gear (31) is arranged inside the second external gear (32) and the two are meshed; the second internal gear (31) is fixedly mounted on the main shaft (422).

5. A composite multi-stage shielded fluorine pump according to claim 4, characterized in that: The gear front cover plate 1 (23) is provided with an oil suction chamber 1 (231), and the gear rear cover plate 1 (25) is provided with an oil pressure chamber 1 (251); the gear front cover plate 2 (33) is provided with an oil suction chamber 2 (351), and the gear rear cover plate 2 (35) is provided with an oil pressure chamber 2 (331); A front low-pressure area (112) is provided on one side of the front bearing seat (12), and a front high-pressure area (113) is provided on the other side of the front bearing seat (12); a rear low-pressure area (152) is provided on one side of the rear bearing seat (14), and a rear high-pressure area (153) is provided on the other side of the front bearing seat (12).

6. A composite multi-stage shielded fluorine pump according to claim 5, characterized in that: The medium flow channel is composed of an oil pressure chamber 1 (251), a front flow chamber (122), a front high pressure area (113), a rear low pressure area (152), a rear flow chamber (142) and an oil suction chamber 2 (351); wherein one end of the front flow chamber (122) is connected to the front high pressure area (113), and the other end of the front flow chamber (122) is connected to the oil pressure chamber 1 (251); one end of the rear flow chamber (142) is connected to the rear low pressure area (152), and the other end of the rear flow chamber (142) is connected to the oil suction chamber 2 (351).

7. A composite multi-stage shielded fluorine pump according to claim 1, characterized in that: The second working assembly (3) comprises an impeller coaxially fixedly mounted on the main shaft (422), and a plurality of guide vanes are fixedly arranged on the circumferential side of the impeller.

8. A composite multi-stage shielded fluorine pump according to claim 1, characterized in that: The stator assembly (41) is provided with a stator shielding sleeve (411), the stator shielding sleeve (411) being a stator potting layer formed by potting processing and completely enveloping the stator assembly (41); the rotor assembly (42) is provided with a rotor shielding sleeve (421), the rotor shielding sleeve (421) being a rotor potting layer formed by potting processing and completely enveloping the rotor assembly (42); and the flow gap (43) is provided between the stator shielding sleeve (411) and the rotor shielding sleeve (421).

9. A composite multi-stage shielded fluorine pump according to claim 1, characterized in that: A front thrust bearing seat (125) and a rear thrust bearing seat (145) are fixedly mounted on the main shaft (422), respectively; the rotor assembly (42) is arranged between the front thrust bearing seat (125) and the rear thrust bearing seat (145); a front thrust bearing (124) is mounted on the front thrust bearing seat (125), and a rear thrust bearing (144) is mounted on the rear thrust bearing seat (145); the front thrust bearing (124) and the rear thrust bearing (144) are both in compression contact with the inner wall of the pump body (1) to balance the axial force of the main shaft (422) and / or limit the movement range of the main shaft (422).

10. A composite multi-stage canned fluorine pump according to claim 4, characterized in that: The gear front cover plate 1 (23), the gear front cover plate 2 (33), the gear rear cover plate 1 (25), the gear rear cover plate 2 (35), the gear cavity 1 (24) and the gear cavity 2 (34) are all covered with a diamond-like coating.

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