High-radiation high-corrosion double-high fluid delivery pump device

Abstract

The invention relates to the technical field of pumping and fluid sealing, and discloses a high-radiation high-corrosion double-high fluid conveying pump device which comprises a pump base, a cavity cover, an air inlet pipe, an air outlet pipe and a diaphragm chamber, a diaphragm fixed between the cavity cover and the pump base is arranged in the diaphragm chamber, and a first sealing ring groove is formed in the end face of the end, facing the cavity cover, of the pump base. A second sealing ring groove is formed in the end face of the end, facing the pump base, of the cavity cover, the first sealing ring groove is formed around the pump base by one circle, and the second sealing ring groove is formed around the cavity cover by one circle. Wherein the first sealing ring groove corresponds to the second sealing ring groove when the pump base and the cavity cover are in a fixed state, the diaphragm penetrates through a cavity between the first sealing ring groove and the second sealing ring groove, supporting rings are placed in the first sealing ring groove and the second sealing ring groove, and a plurality of rubber sealing rings are placed on the two sides of each supporting ring. The progressive multi-direction composite compression sealing structure is achieved, and meanwhile the corrosion resistance, radiation resistance and durability are synergistically improved on the sealing element material and surface appearance level.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pumping and fluid sealing, and particularly relates to a high-radiation and high-corrosion double-high fluid conveying pump device. BACKGROUND

[0002] In the fields of nuclear industry, chemical industry and environmental protection, the conveying of high-radiation and high-corrosion (such as fluorine gas, hydrogen fluoride and the like) fluids puts forward strict requirements on the reliability and durability of the pump device. Such media not only accelerates the corrosion failure of metal parts, but also causes the rapid aging of high polymer materials in the radiation environment. The traditional mechanical conveying pump is prone to leakage of dangerous media due to seal failure in long-term operation because of the dynamic seal structure, and the pneumatic diaphragm pump becomes an ideal choice for conveying such high-risk media due to its non-leakage design, complete isolation of media and the like.

[0003] The core defects of the traditional pneumatic diaphragm pump are concentrated on the dynamic seal structure between the pump base and the diaphragm chamber cover. The diaphragm needs to continuously bear high-pressure alternating load, high-frequency reciprocating motion and chemical corrosion of strong corrosive media in operation, and also needs to resist the influence of high-energy radiation environment. Such complex multi-factor coupling will cause the diaphragm material to accelerate aging, fatigue crack propagation, and finally cause seal failure and media leakage. Especially when conveying fluorine gas, hydrogen fluoride and other strong corrosive media, the conventional diaphragm material often cannot meet the comprehensive requirements of corrosion resistance, radiation resistance and mechanical durability, which seriously restricts the service life and operation safety of the pump device under double-high working conditions. SUMMARY

[0004] The application provides a high-radiation and high-corrosion double-high fluid conveying pump device, and the technical problem that the diaphragm chamber sealing part in the prior art is easy to fail and leak under the combined action of high radiation, high corrosion and alternating load. A structure for realizing progressive multidirectional composite compression sealing between the pump base and the cavity cover end surface is provided, and the corrosion resistance, radiation resistance and durability of the sealing element material and surface topography are simultaneously improved.

[0005] The application provides a high-radiation and high-corrosion double-high fluid conveying pump device, which comprises a pump base, cavity covers installed at both ends of the pump base, an air inlet pipe and an air outlet pipe communicated between the two cavity covers, a diaphragm chamber is arranged between the cavity cover and the pump base, and a diaphragm is arranged in the diaphragm chamber and fixed between the cavity cover and the pump base, characterized in that a sealing ring groove one is formed in the end face of the pump base towards the cavity cover, a sealing ring groove two is formed in the end face of the cavity cover towards the pump base, the sealing ring groove one is formed around the pump base, and the sealing ring groove two is formed around the cavity cover; wherein the opening directions of the sealing ring groove one and the sealing ring groove two are opposite under the fixed state of the pump base and the cavity cover, the diaphragm passes through the cavity between the sealing ring groove one and the sealing ring groove two, a support ring is arranged in each of the sealing ring groove one and the sealing ring groove two, the edge of the support ring is located at the contact surface of the cavity cover and the pump base, and a plurality of rubber sealing rings are arranged on both sides of the support ring.

[0006] Further, the support ring comprises a middle ring part, an upper inclined ring part and a lower inclined ring part; wherein the upper inclined ring part and the lower inclined ring part are integrally formed on the upper edge and the lower edge of the middle ring part respectively, the upper inclined ring part and the lower inclined ring part are inclined to the same side away from the side edge of the middle ring part, and are used for abutting against the side wall of the diaphragm, and part of the rubber sealing rings are located between the upper inclined ring part and the lower inclined ring part.

[0007] Further, a plurality of slot holes are formed on the middle ring part, the upper inclined ring part and the lower inclined ring part, and the slot holes are equidistantly arranged around the ring parts.

[0008] Further, the cross section of the sealing ring groove one and the sealing ring groove two is in a trapezoidal structure, the inclination angle of the inner side wall is matched with the upper inclined ring part and the lower inclined ring part of the support ring, and a progressive compression sealing structure is formed.

[0009] Further, the rubber sealing ring is in a gradient functional composite material structure, and comprises, from inside to outside, an elastic support bottom layer composed of ethylene-propylene-diene rubber and a carbon nanotube reinforced network, an anti-radiation middle layer composed of hydrogenated nitrile rubber as a matrix and dispersed gadolinium boride anti-radiation filler, and a corrosion-resistant surface layer composed of perfluoroether rubber and polytetrafluoroethylene nanofiber.

[0010] Further, the outer surface of the corrosion-resistant surface layer is provided with a micro-texture array formed by laser etching, which comprises: a ring-shaped micro-groove formed around the corrosion-resistant surface layer; and a conical micro-pit distributed between the ring-shaped micro-grooves.

[0011] Further, the particle size of the gadolinium boride filler in the anti-radiation middle layer is 5-15 μm, the volume fraction is 10%-25%, and the filler is gradiently distributed in the hydrogenated nitrile rubber matrix.

[0012] The one or more technical solutions provided in the application have at least the following technical effects or advantages:

[0013] The angle matching of the trapezoidal sealing ring groove and the inclined ring part of the support ring converts the axial clamping force into axial and radial composite compression, the sealing specific pressure is self-adaptively improved when the internal pressure rises, the micro-leakage and transient leakage are significantly reduced, the return curvature radius of the diaphragm clamping area is limited by the upper and lower inclined ring parts, the edge shear and rolling are inhibited, the fatigue crack initiation and propagation are delayed, the diaphragm life and reliability are improved, the circumferential groove hole of the support ring forms a pressure equalization and elastic release channel, the peak value of the ring specific pressure is reduced, the meshing gnawing of the sealing ring is inhibited, the extrusion damage under high pressure difference is inhibited, and the long-term sealing state is stable, the annular micro-groove and the conical micro-pit on the outer surface store a small amount of lubrication and capture by-products, reduce adhesion and abrasive wear, reduce starting stick-slip and vibration, and maintain stable sealing specific pressure, the wedge-shaped fit and multi-ring distribution have strong tolerance absorption capacity for end face flatness, coaxiality and thermal expansion and contraction, the target compression rate is easily achieved through step-by-step torque, and the assembly sensitivity and rework rate are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of a high-radiation and high-corrosion double-high fluid conveying pump device in an embodiment of the application.

[0015] Figure 2 It is an exploded schematic diagram of the conveying pump device in an embodiment of the application.

[0016] Figure 3 It is Figure 1 a cross-sectional schematic diagram of part of the structure.

[0017] Figure 4 It is Figure 3 an enlarged schematic diagram of part A.

[0018] Figure 5 It is a schematic diagram of the overall structure of the support ring in an embodiment of the application.

[0019] Figure 6 It is a schematic diagram of the overall structure of the rubber sealing ring in an embodiment of the application.

[0020] Figure 7 It is a cross-sectional schematic diagram of the rubber sealing ring in an embodiment of the application.

[0021] In the figure: 1, pump base; 2, cavity cover; 3, air inlet pipe; 4, air outlet pipe; 5, diaphragm chamber; 6, diaphragm; 7, support ring; 8, rubber sealing ring; 11, sealing ring groove one; 21, sealing ring groove two; 71, middle ring part; 72, upper inclined ring part; 73, lower inclined ring part; 701, groove hole; 81, elastic support bottom layer; 82, radiation-resistant middle layer; 83, corrosion-resistant surface layer; 831, annular micro-groove; 832, conical micro-pit. Detailed Implementation

[0022] To better understand the technical solution of this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] See Figures 1 to 7 A high-radiation, high-corrosion, dual-high fluid transfer pump device includes a pump base 1, chamber covers 2 disposed at both ends of the pump base 1, and an air inlet pipe 3 and an air outlet pipe 4 connecting the two chamber covers 2. A diaphragm chamber 5 is formed between the pump base 1 and the chamber covers 2. A diaphragm 6 is disposed inside the diaphragm chamber 5, and the edge of the diaphragm 6 is clamped and fixed between the pump base 1 and the chamber covers 2.

[0024] See Figure 1 A sealing ring groove 11 is formed circumferentially on the end face of the pump base 1 facing the cavity cover 2, and a sealing ring groove 21 is formed circumferentially on the end face of the cavity cover 2 facing the pump base 1. The two grooves are coaxially aligned after assembly, forming a cavity between them to accommodate the edge of the diaphragm 6. Support rings 7 are provided in both sealing ring groove 11 and sealing ring groove 21, and several rubber sealing rings 8 are provided on both sides of the support rings 7 to achieve a composite progressive seal in the axial and radial directions.

[0025] See Figure 4 , Geometry of the sealing ring groove.

[0026] Shape: The cross-section of sealing ring groove 11 and sealing ring groove 21 is a trapezoid with a wider outer side and a narrower inner side, and the inclination angle of the inner side wall matches the inclined surface of the support ring 7.

[0027] Groove width and depth: Taking a pump with a nominal diameter of DN50 as an example, the width of the annular groove opening is 3.5–5.0 mm, and the effective groove depth is 3.0–4.5 mm.

[0028] Rounding: A fillet radius of R0.2–R0.5mm is provided at the connection between the bottom of the groove and the side wall. In this embodiment, it is R0.3mm, in order to alleviate stress concentration.

[0029] End face roughness and flatness: the roughness Ra of the end face in contact with diaphragm 6 is ≤0.8μm; the flatness of the mating area between the pump seat 1 and the cavity cover 2 is ≤0.03mm / Φ200mm.

[0030] See Figure 5 , support ring 7.

[0031] Structure: The support ring 7 includes a middle ring portion 71, an integrally formed upper inclined ring portion 72 and a lower inclined ring portion 73. The upper inclined ring portion 72 and the lower inclined ring portion 73 are inclined toward the diaphragm 6 from the side away from the middle ring portion 71, so as to abut against the sidewall of the diaphragm 6 and limit its bending radius.

[0032] Inclined angle: Matching the inner wall of the annular groove, preferably 15°–20°.

[0033] Slot hole 701: equidistantly opened along the circumferential direction of the middle ring part 71, the upper inclined ring part 72 and the lower inclined ring part 73 to balance and release stress. The hole type is preferably a through long circular hole, the hole width is 0.5-0.8mm, the pitch is 8°-12°, and the ring opening rate is about 6%-8%.

[0034] Size fit: the radial gap between the support ring 7 and the ring groove is 0.05-0.20mm.

[0035] Surface roughness: the surface roughness of the contact part between the inclined surface and the diaphragm 6 is Ra≤0.8μm.

[0036] Rubber seal ring 8

[0037] Number and arrangement: 3 on each side of the support ring 7, arranged equidistantly in the axial direction; it can also be adjusted to 2-4 on each side according to the working condition to meet different pressure difference and temperature conditions.

[0038] Cross section and compression rate: the cross section is quasi-circular, and the total radial compression rate is preferably 10%-25%, and the design of the embodiment is 18%.

[0039] Interference: the interference of the free state diameter to the cavity space is about 10%-15%, and the interference of the embodiment is 12%.

[0040] Pump seat 1, cavity cover 2: preferably nickel-based corrosion-resistant alloy, titanium alloy, duplex stainless steel or metal+PFA / ETFE lining. The embodiment uses C-276 integral machining.

[0041] Support ring 7: preferably C-276, Monel or titanium alloy; the embodiment uses C-276, the hardness after heat treatment is 260-300HV, and the resistance to pitting and crevice corrosion is strong.

[0042] Rubber seal ring 8: gradient functional composite structure.

[0043] Surface cleaning: the surfaces related to sealing are deburred, finely ground and ultrasonically cleaned, and finally degreased with anhydrous ethanol or isopropanol, and the cleanliness level is not less than ISO8.

[0044] Gradient functional seal ring structure and preparation

[0045] Layered structure

[0046] Elastic support bottom layer 81: EPDM matrix, adding 0.3-0.8wt% carbon nanotubes (CNT) and an appropriate amount of white carbon black / carbon black, hardness 60-80ShoreA, the embodiment is 70Shore A, providing resilience and compression set resistance.

[0047] Radiation resistant intermediate layer 82: HNBR matrix, dispersed gadolinium boride (GdB_x) filler, particle size 5-15 μm, volume fraction 10%-25%; in this embodiment, particle size 10 μm, volume fraction 15%, increasing radially from inside to outside to improve absorption and scattering of neutrons / high-energy radiation.

[0048] Corrosion resistant surface layer 83: FFKM matrix, compounded with 0.5-5 wt% PTFE nanofiber network, 2 wt% in this embodiment, to build a dense impermeable and anti-stiction interface.

[0049] Thickness ratio of each layer: inner layer 20%-40%, middle layer 30%-50%, outer layer 20%-40%; in this embodiment, 30%, 40%, and 30%, respectively.

[0050] Preparation process

[0051] Inner and middle layers: internal mixing - open mixing - extrusion preforming; the middle layer is co-extruded using multiple formulations in the radial direction to form a gradient.

[0052] Outer layer: FFKM and PTFE nanofiber wet-laid co-coating.

[0053] Co-vulcanization / molding: molded at 170-190°C, 8-12 MPa (parameters adjusted according to formulation), pressure maintained for 15-25 min.

[0054] Post-processing: secondary post-vulcanization and inert atmosphere annealing to stabilize the crosslinked network.

[0055] Surface micro-texture: picosecond or femtosecond laser etching.

[0056] Micro-texture array and processing

[0057] Appearance: circumferential annular micro-grooves 831 and conical micro-pits 832 arranged therebetween.

[0058] Parameters: groove width 20-80 μm, depth 5-25 μm; pit diameter 30-120 μm, depth 10-40 μm, in a hexagonal close-packed arrangement with a center distance of 100-300 μm.

[0059] Function: stores micro amounts of lubricant, accommodates reaction byproducts, forms a stable micro-liquid film, reduces adhesive wear and stick-slip, and balances the interfacial specific pressure.

[0060] Processing: 532 / 1064 nm picosecond laser is used, single-channel energy density and scanning speed are optimized according to material absorption, process temperature control <80°C to avoid rubber thermal damage; after processing, the surface is lightly activated and cleaned of residues by plasma.

[0061] Assembly process and tolerance control

[0062] Pre-treatment: Check the size, fillet and roughness of seal ring groove 1 1 and seal ring groove 2 21; check the bevel and hole 701 of support ring 7 without burrs.

[0063] Cleaning: Use fiber-free wiping + ultrasonic or vacuum drying, prohibit oil stains and particle residues.

[0064] Lubrication: Lightly apply a thin layer of perfluoropolyether lubricant to the outer surface of the seal ring and the inner sidewall of the ring groove.

[0065] Assembly sequence

[0066] Place three seal rings on each side in the corresponding position on both sides of the support ring 7; position the edge of the diaphragm 6 so that it passes through the cavity between the two ring grooves and fits the side of the upper and lower beveled ring parts 73; fold the cavity cover 2 and the pump base 1, tighten the fasteners in steps with equal torque at a diagonal line until the designed compression rate is reached; recheck: check the seal ring compression rate, the coaxiality of the support ring 7 and the ring groove, and the end face gap; if necessary, adjust the torque evenly and compressively in sequence. Wedge progressive compression: the axial clamping force is converted into a radial component through the inner sidewall of the ring groove and the bevel of the support ring 7, so that the seal rings on both sides and in the middle are gradually pressed, forming an axial + radial composite pressure field; the "self-gain" effect is generated when the internal pressure rises, improving the sealing redundancy.

[0067] Diaphragm 6 guidance and damage reduction: the upper beveled ring part 72 and the lower beveled ring part 73 limit the bending radius of the diaphragm 6 clamping area, inhibit edge rollover and shear peak, and delay the initiation of fatigue cracks.

[0068] Pressure equalization and relief: the hole 701 forms a ring-shaped pressure equalization and elastic release path, avoiding local extrusion and gnawing; at the same time, it helps to form a uniform thin film flow, reducing fretting wear.

[0069] Material synergy: the inner layer EPDM+CNT provides resilience and structural support, the middle layer GdB_x gradient layer absorbs / scatters radiant energy to reduce the degradation rate of rubber chains, and the outer layer FFKM / PTFE constructs a high chemical inertness and low permeability interface; surface micro-texture further stabilizes the boundary lubrication.

[0070] Applicable working conditions and boundary conditions

[0071] Medium: fluorine gas, hydrogen fluoride, fluorine-containing corrosive mixed gas / liquid, etc.

[0072] Temperature: -20°C to +120°C.

[0073] Pressure difference: from normal pressure to 1.6 MPa.

[0074] Irradiation: total dose ≥1 MGy.

[0075] Leakage level (design target): helium leak rate ≤1×10^-6 Pa·m^3 / s.

[0076] Vibration: meet the pump group conventional vibration level, axial / radial micro-motion not more than 0.1 mm (RMS)

[0077] Maintenance and replacement recommendations

[0078] Regularly check the end face fastener torque;

[0079] In strong corrosive medium long-term operation, it is recommended to check the wear of the sealing ring and the diaphragm 6 clamping area every 6000-10000 h or annual shutdown;

[0080] Keep clean and dust-free when disassembling, and strictly prohibit prying and squeezing the sealing lip with metal hard tools;

[0081] If the sealing ring is replaced, it is recommended to replace the same batch and same formula to ensure the consistency of the gradient and micro-texture.

[0082] The functional principle of the present application can be described as follows:

[0083] The sealing ring groove of the end face of the pump base 1 and the end face of the cavity cover 2 is a trapezoidal shape with a wide outer and a narrow inner, and the inner side wall is matched with the upper and lower inclined ring parts 73 of the support ring 7. The axial clamping force Fa applied during assembly is converted into a radial component force by the wedge surface, which causes the sealing ring to be compressed in the radial and axial directions. Approximately, the radial component force Fr is positively correlated with the wedge angle a, and the sealing ring is distributed in the gap on both sides and in the middle of the support ring 7, and the force is transmitted in turn, forming a "multi-stage, gradual, self-gain" sealing path; When the internal pressure rises, the wedge interface generates additional radial clamping, and the sealing specific pressure increases with the internal pressure. The upper inclined ring part 72 and the lower inclined ring part 73 of the support ring 7 abut against the side wall of the diaphragm 6, limiting the return curvature radius R of the diaphragm 6 in the clamping area, and avoiding the occurrence of small radius sharp folding at the edge. The groove hole 701 of the support ring 7 is distributed equidistantly along the circumference, forming a small compliance and flow path.

[0084] When the sealing ring is compressed, the slot hole 701 provides ring pressure equalization and stress release channel, reduces the local specific pressure peak and gnawing; at the same time, it provides a path for the formation of a controllable thin film flow at the interface, inhibits fretting wear and extrusion damage. The sealing ring is composed of EPDM+CNT elastic support layer, HNBR containing GdBx intermediate layer 82, and FFKM / PTFE nanocomposite corrosion-resistant surface layer 83 from inside to outside. The inner layer provides high resilience and low compression permanent deformation, ensuring the sustainability of the sealing specific pressure. The middle layer: HNBR has better radiation stability due to low unsaturation; Gd and B have high capture cross section for thermal neutrons and energy dissipation and scattering effect for high energy radiation. Controlling the particle size of GdBx to 5-15 μm and the volume fraction to 10%-25%, and using gradient distribution, can make the radiation energy gradually attenuate in the thickness direction, while reducing the shear concentration caused by the modulus mutation between layers. The outer layer: FFKM has extremely low solubility S and permeability D, and PTFE nanofiber constructs a dense skeleton, which significantly reduces the permeation flux of corrosive small molecules.

[0085] The hierarchical-gradient design complements the resilience, radiation resistance, and permeation resistance to maintain long-term stable sealing specific pressure.

[0086] Micro-textured boundary lubrication and anti-adhesion principle: etching ring-shaped micro-grooves 831 and conical micro-pits 832 array on the surface of the outer FFKM layer to construct a liquid storage cavity and debris capture site. The texture can store a small amount of inert lubricant in the boundary or mixed lubrication area, forming a local micro-wedge flow; at the same time, it captures reaction byproducts and particles, reducing third-body abrasive wear and adhesive wear, and stabilizing the sealing specific pressure and friction coefficient.

[0087] Thermal / assembly tolerance self-adaptive principle - wedge-shaped fit and multi-turn seal have strong tolerance absorption capacity, which can passively compensate for thermal expansion and contraction, end face warping, and slight coaxiality deviation; when the load and temperature fluctuate, the sealing specific pressure can still be maintained within the target window.

[0088] Comprehensive technical effect: multi-stage wedge-shaped progressive compression makes the sealing specific pressure self-increase with the working condition, significantly reducing the probability of micro-leakage and transient leakage; the low permeability and chemical inertness of the outer layer improve the shielding ability against strong corrosive media such as F2 / HF; the target can achieve a helium leak rate of ≤1×10^-6 Pa·m^3 / s.

[0089] High adaptability to radiation resistance and corrosion resistance, reducing the rate of polymer chain rupture / crosslinking imbalance, and higher mechanical retention rate after irradiation; the FFKM / PTFE outer layer significantly reduces the permeation and chemical corrosion of active molecules such as F and HF, and the micro-texture further reduces the wear induced by adhesion and chemical reaction.

[0090] It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0091] The above descriptions are only the preferred embodiments of the present application, not intended to limit the protection scope of the present application. Any modification and variation within the technical range disclosed by the present application, according to the technical solution and concept of the present application, should be covered within the protection scope of the present application.

Claims

1. A high-radiation, high-corrosion, dual-high fluid transfer pump device, comprising a pump base (1), cavity covers (2) installed at both ends of the pump base (1), an inlet pipe (3) and an outlet pipe (4) connecting the two cavity covers (2), a diaphragm chamber (5) provided between the cavity covers (2) and the pump base (1), and a spacer membrane (6) fixed to the cavity covers (2) and the pump base (1) provided in the diaphragm chamber (5), characterized in that, The pump base (1) is provided with a sealing ring groove one (11) on the end face of one end of the cavity cover (2), the cavity cover (2) is provided with a sealing ring groove two (21) on the end face of one end of the pump base (1), the sealing ring groove one (11) is provided around the pump base (1), and the sealing ring groove two (21) is provided around the cavity cover (2); Wherein, the opening direction of the sealing ring groove one (11) and the sealing ring groove two (21) of the pump base (1) and the cavity cover (2) in the fixed state is opposite, the diaphragm (6) passes through the cavity between the sealing ring groove one (11) and the sealing ring groove two (21), the support ring (7) is arranged in the sealing ring groove one (11) and the sealing ring groove two (21), the edge of the support ring (7) is located at the contact surface of the cavity cover (2) and the pump base (1), and the rubber sealing ring (8) is arranged on the two sides of the support ring (7).

2. A high radiation high corrosive double high fluid transfer pump assembly as claimed in claim 1, wherein, The support ring (7) comprises a middle ring part (71), an upper inclined ring part (72) and a lower inclined ring part (73); Wherein, the upper inclined ring part (72) and the lower inclined ring part (73) are integrally formed on the upper edge and the lower edge of the middle ring part (71), respectively, the upper inclined ring part (72) and the lower inclined ring part (73) are inclined to the same side away from the side of the middle ring part (71), and are used for abutting against the side wall of the diaphragm (6), and part of the rubber sealing ring (8) is located between the upper inclined ring part (72) and the lower inclined ring part (73).

3. A dual high fluid transfer pump assembly of claim 2, wherein, A plurality of slot holes (701) are arranged on the middle ring part (71), the upper inclined ring part (72) and the lower inclined ring part (73) along the circumference at equal intervals.

4. A high radiation high corrosive double high fluid transfer pump assembly as claimed in claim 2, wherein, The cross section of the sealing ring groove one (11) and the sealing ring groove two (21) is a trapezoidal structure, the inner side wall inclination angle is parallel to the upper inclined ring part (72) and the lower inclined ring part (73) of the support ring (7), and a progressive compression sealing structure is formed.

5. A high radiation high corrosive double high fluid transfer pump assembly as claimed in claim 1, wherein, The rubber sealing ring (8) is a gradient functional composite material structure, which comprises, from inside to outside: An elastic support bottom layer (81) composed of ethylene-propylene-diene rubber and carbon nanotube reinforced network; An anti-radiation middle layer (82) composed of hydrogenated nitrile rubber as a matrix and dispersed gadolinium boride anti-radiation filler; A corrosion-resistant surface layer (83) composed of perfluoroether rubber and polytetrafluoroethylene nanofiber composite.

6. A high radiation high corrosive double high fluid transfer pump assembly as claimed in claim 5 wherein, The outer surface of the corrosion-resistant surface layer (83) is provided with a micro-texture array formed by laser etching, comprising: An annular micro-groove (831) provided around the corrosion-resistant surface layer (83); A conical micro-pit (832) distributed between the annular micro-groove (831).

7. A high radiation high corrosive double high fluid transfer pump assembly as claimed in claim 5 wherein, The particle size of the gadolinium boride filler in the anti-radiation middle layer (82) is 5-15 μm, the volume fraction is 10%-25%, and the filler is gradient distributed in the hydrogenated nitrile rubber matrix.

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