Nonmetal mechanical seal for high-temperature-corrosion easy-crystallization solid-phase-particle-containing medium

Abstract

The invention discloses a non-metal mechanical seal for a high-temperature-corrosion easy-crystallization solid-phase-particle-containing medium, and the non-metal mechanical seal is characterized in that an outer box body with a cooling water channel and the left end of a shaft sleeve are in contact with the medium firstly, and the part in contact with the medium is made of fluoroplastic; the first static sealing piece and the first movable sealing piece are blocked to form a first seal; circulating cooling water is introduced into the outer box body with the cooling water channel to form a second seal; through blocking of the second static sealing piece and the second dynamic sealing piece, a third seal is formed; a third static sealing piece on the connecting seat forms a fourth seal; the limiting piece positions the connecting base, the connecting base cannot deviate in direction, and the second sealing face is attached all the time; therefore, the technical problems that the service life of a mechanical seal mainly made of metal is relatively short, the assembly precision is difficult to grasp due to the fact that all parts collide with one another in the assembly process, the technical requirement for assembly personnel is relatively high, local eccentric wear is prone to occurring, and the sealing performance is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of pump components, in particular to a non-metallic mechanical seal for high-temperature corrosive, easy-to-crystallize medium containing solid particles. 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, increasing the potential of the liquid. The pump is mainly used to transport water, oil, acid and alkali liquid, emulsion, suspension emulsion and liquid metal and other media. It can also transport special media containing solid particles that are easy to crystallize (containing alkali, salt, calcium), high temperature (about 200℃), and highly corrosive (containing acid, alkali, salt). When conveying special media, due to the relatively harsh working conditions, the sealing requirements of the pump are relatively high, because once leakage occurs, there is a great risk, and in serious cases, casualties will occur; Mechanical seal is an important component to ensure sealing. Traditional mechanical seals are generally made of austenitic 304, 316L alloy, Hastelloy, titanium alloy and other materials. Austenitic 304 and 316L alloys have average corrosion resistance and short service life. Hastelloy and titanium alloys are expensive. In addition, during the assembly process of mechanical seals made of metal as the main material, each component is hard to meet each other, making it difficult to grasp the assembly accuracy and prone to local eccentric wear. The technical requirements for assemblers are relatively high. Summary of the invention

[0003] In view of the above-mentioned deficiencies existing in the related technology, the purpose is to provide a non-metallic mechanical seal for high-temperature corrosive and easily crystallized media containing solid particles, so as to solve the technical problems that the mechanical seals in the related technology with metal as the main material have a relatively short service life, and during the assembly process, the various components are hard to grasp the assembly accuracy, the technical requirements for the assemblers are relatively high, and local eccentric wear is prone to occur, which affects the sealing performance.

[0004] The technical solution to achieve the purpose is: non-metallic mechanical seal for high temperature corrosive and easy to crystallize solid phase particle containing medium, including: The outer box body with cooling water channel is made of fluoroplastic, the left end of which is in direct contact with the medium, the middle part of the outer box body with cooling water channel has a stepped through hole, the stepped through hole is penetrated by the pump shaft, and the outer box body with cooling water channel is spaced apart from the pump shaft; A shaft sleeve is sleeved on the pump shaft from left to right, is arranged at the stepped through hole, is spaced apart from the outer box body with the cooling water channel, and both ends of the shaft sleeve protrude from the stepped through hole, and the left end of the shaft sleeve is made of fluoroplastic and is in direct contact with the medium; A connecting seat is sleeved on the shaft sleeve from right to left, the left end of the connecting seat penetrates the stepped through hole, and is spaced apart from the outer box body with the cooling water channel, and the right end is arranged outside the stepped through hole and connected to the pump shaft. When the pump shaft rotates, the connecting seat and the shaft sleeve rotate together with the pump shaft; A limiting member, connected to the outer box body with the cooling water channel, and used for blocking and limiting the connecting seat; A first static seal is connected to the outer box body with the cooling water channel, is arranged in the stepped through hole, surrounds the shaft sleeve, and is spaced apart from the shaft sleeve; A second static seal is connected to the outer box body with the cooling water channel, is disposed in the stepped through hole, surrounds the shaft sleeve, is spaced apart from the shaft sleeve, and is spaced apart from the first static seal; A first dynamic seal, connected to the shaft sleeve, rotates with the shaft sleeve, and forms a first sealing surface with the first static seal; A second dynamic seal is connected to the connection seat, surrounds the shaft sleeve, rotates with the connection seat, and forms a second sealing surface with the second static seal; And a plurality of third static seals, one connected to the left end surface of the outer box body with the cooling water channel, one connected to the left end surface of the shaft sleeve, and one connected between the shaft sleeve and the connecting seat.

[0005] Further: the outer box body with cooling water channel comprises: a main body, the middle part of which has the stepped through hole; Three pipe openings are connected to the main body at intervals, a through groove is provided between the pipe opening and the main body, one end of the through groove passes through the pipe opening, and the other end of the through groove passes through the main body, and is arranged between the first static seal and the second static seal, and communicates with the stepped through hole; Three first O-rings, connected one-to-one to the pipe opening, surrounding one end of the through groove; And three joints are connected one-to-one at the through groove, communicated with the through groove, press the first O-ring, and are used to pass cooling water between the first static seal, the second static seal and the shaft sleeve.

[0006] Further: the shaft sleeve includes: a first insert, which is sleeved on the pump shaft from left to right; a second insert, which is sleeved on the left end of the first insert and connected to the left end of the first insert; and a first inlaid layer, which is made of fluoroplastic and wraps part of the first insert and the second insert, and the right end of the first inlaid layer forms a stepped structure with the right end of the first insert.

[0007] Further: the first insert has a first stepped groove and a second stepped groove on the left end, a first groove on the right end, and an external thread on the outer circle at the middle position; The second insert is provided with a plurality of first through holes and a third stepped groove, and the first through holes are communicated with the third stepped groove.

[0008] The left end surface of the first inlaid layer is connected to the third static seal, the outer circle is provided with a labyrinth seal groove, the middle part is provided with a fourth stepped groove and three second grooves, and the first dynamic seal is connected to the fourth stepped groove and the second groove.

[0009] Further: the connecting seat includes: a third insert, which is sleeved on the shaft sleeve from right to left, and the third insert has a fifth stepped groove and a second through hole, the fifth stepped groove is connected to the second through hole, and the second through hole contacts the shaft sleeve; The second inlay layer is made of fluoroplastic, connected to the third inlay, arranged at the fifth stepped groove, connecting the third static seal and the second dynamic seal, the second inlay layer is in contact with the first inlay layer and the right end of the first inlay, and the second inlay layer also has three third grooves; And a plurality of set screws are arranged at intervals, threadedly connected to the right end of the third insert, penetrate the third through hole on the right end of the first insert one by one, and abut against the pump shaft.

[0010] Further: the limiting member includes: a pressure block, connected to the right end of the outer box body with the cooling water channel, blocking the connecting seat; and a stopper, connected to the pressure block, arranged between the pressure block and the fixing screw, inserted into the fourth groove on the third insert, and loosely matched with the fourth groove.

[0011] Furthermore: the first static seal and the second static seal have the same structure, both comprising: a static ring body, connected in the stepped through hole, surrounding the shaft sleeve, and spaced apart from the shaft sleeve; and a second O-ring, made of fluororubber, connected to the outer circle of the static ring body, and arranged between the static ring body and the outer box body having the cooling water channel.

[0012] Further: the first dynamic seal and the second dynamic seal have the same structure, both comprising: a dynamic ring body, forming the first sealing surface or the second sealing surface with the static ring body, and the side wall of the dynamic ring body has three fifth grooves; A third O-ring, made of fluororubber, is disposed between the moving ring body and the shaft sleeve, or between the moving ring body and the connecting seat; And a corrugated spring, when connected between the moving ring body and the shaft sleeve, the positioning feet on the corrugated spring are plugged into the second groove and the fifth groove; when connected between the moving ring body and the connecting seat, the positioning feet on the corrugated spring are plugged into the third groove and the fifth groove.

[0013] Furthermore: the third static seal is an O-ring made of fluororubber.

[0014] The above technical solution has the following beneficial effects: the non-metallic mechanical seal for high-temperature corrosive and easily crystallized solid-phase particle-containing media is provided with an outer box body with a cooling water channel, a shaft sleeve, a connecting seat, a stopper, a first static seal, a second static seal, a first dynamic seal, a second dynamic seal and a third static seal compared with the related art; When in use, the shaft sleeve is sleeved on the pump shaft from left to right, the left end of the outer box body with the cooling water channel is connected to the pump cover, and the left end of the shaft sleeve is fitted with the impeller. The third static seal ensures the sealing between the outer box body with the cooling water channel and the pump cover, and the sealing between the shaft sleeve and the impeller. The outer box with cooling water channel and the left end of the sleeve are in contact with the medium first. Since the part in contact with the medium is fluoroplastic, it has good corrosion resistance and relatively long service life. In addition, compared with alloy steel, fluoroplastic is relatively soft. During assembly, the various parts will not collide with each other, so the assembly is relatively convenient and easy to grasp the assembly accuracy. The first static seal and the first dynamic seal block to form the first seal; circulating cooling water is introduced from the outer box body with a cooling water channel, and the cooling water has pressure to form the second seal; the second static seal and the second dynamic seal block to form the third seal; the third static seal on the connecting seat forms the fourth seal; multiple blocking seals have relatively good sealing performance; A limiting piece is provided, and the connection seat is positioned. When the connection seat, the shaft sleeve, the first dynamic seal and the second dynamic seal rotate together with the pump shaft, the connection seat will not deviate in direction, so that the second sealing surface is always in contact, the reliability of the structure is good, and the sealing is guaranteed; Thereby overcoming the technical problems that mechanical seals with metal as the main material have a relatively short service life, during the assembly process, the various components are hard to grasp, the assembly accuracy is difficult to grasp, the technical requirements for the assemblers are relatively high, and local eccentric wear is prone to occur, which affects the sealing performance. The system achieves a relatively long service life, relatively convenient assembly, easy to grasp the assembly accuracy, and ensures the technical effect of sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the general assembly structure; Figure 2It is a schematic diagram of the structure of the outer box body with cooling water channel and the third static seal; Figure 3 is a schematic diagram of the structure of the shaft sleeve and the third static seal; Figure 4 is a schematic structural diagram of a first insert and a second insert; Figure 5 It is a structural schematic diagram of the connecting seat and the third static seal; Figure 6 is a schematic diagram of the structure of the third insert and the set screw; Figure 7 for Figure 1 Schematic diagram of the local structure; In the figure: 10. outer box with cooling water channel, 11. stepped through hole, 12. main body, 13. pipe mouth, 13-1. through groove, 14. first O-ring, 15. joint, 20. sleeve, 21. first insert, 21-1. first stepped groove, 21-2. second stepped groove, 21-3. first groove, 21-4. external thread, 21-5. third through hole, 22. second insert, 22-1. first through hole, 22-2. third stepped groove, 23. first inlay layer, 23-1. labyrinth seal groove, 23-2. fourth stepped groove, 23-3. second groove, 30. connecting seat, 31. third Insert, 31-1. Fifth stepped groove, 31-2. Second through hole, 31-3. Fourth groove, 32. Second inlaid layer, 32-1. Third groove, 33. Set screw, 40. Limiting piece, 41. Pressure block, 42. Stopper, 50. First static seal, 51. Static ring body, 52. Second O-ring, 60. Second static seal, 70. First dynamic seal, 80. Second dynamic seal, 71. Dynamic ring body, 71-1. Fifth groove, 72. Third O-ring, 73. Corrugated spring, 73-1. Positioning foot, 701. First sealing surface, 801. Second sealing surface, 90. Third static seal, 100. Pump shaft. DETAILED DESCRIPTION

[0016] In order to make the content easier to understand, the following is a further detailed description based on specific embodiments and in conjunction with the accompanying drawings; The non-metallic mechanical seal for high temperature corrosive and easy to crystallize solid phase particle media solves the problem that the mechanical seal with metal as the main material in the related technology has a relatively short service life. During the assembly process, the various components are hard to grasp the assembly accuracy, and the technical requirements for the assemblers are relatively high. It is easy to have partial wear, which affects the sealing performance. The technical problem has achieved a relatively long service life, relatively convenient assembly, easy to grasp the assembly accuracy, and ensure the positive effect of sealing. The overall idea is as follows:

[0017] like Figure 1, Figure 7 As shown; non-metallic mechanical seals for high temperature corrosive and easy to crystallize solid particles containing media, including: The outer box body 10 with a cooling water channel is made of fluoroplastics, and the left end is in direct contact with the medium. The middle part of the outer box body 10 with a cooling water channel has a stepped through hole 11, and the stepped through hole 11 is penetrated by the pump shaft 100. The outer box body 10 with a cooling water channel is spaced apart from the pump shaft 100; The shaft sleeve 20 is sleeved on the pump shaft 100 from left to right, and is arranged at the stepped through hole 11, and is spaced apart from the outer box body 10 with the cooling water channel, and both ends of the shaft sleeve 20 protrude from the stepped through hole 11, and the left end of the shaft sleeve 20 is made of fluoroplastic and is in direct contact with the medium; The connecting seat 30 is sleeved on the shaft sleeve 20 from right to left, the left end of the connecting seat 30 penetrates the stepped through hole 11, and is spaced apart from the outer box body 10 with the cooling water channel, and the right end is arranged outside the stepped through hole 11 and connected to the pump shaft 100. When the pump shaft 100 rotates, the connecting seat 30 and the shaft sleeve 20 rotate together with the pump shaft 100; A limiting member 40, connected to the outer box body 10 with the cooling water channel, and used for blocking and limiting the connecting seat 30; A first static seal 50 is connected to the outer box body 10 with the cooling water channel, is disposed in the stepped through hole 11, surrounds the shaft sleeve 20, and is spaced apart from the shaft sleeve 20; A second static seal 60 is connected to the outer box 10 with the cooling water channel, is disposed in the stepped through hole 11, surrounds the shaft sleeve 20, is spaced apart from the shaft sleeve 20, and is spaced apart from the first static seal 50; A first dynamic seal 70 is connected to the shaft sleeve 20 and rotates with the shaft sleeve 20 to form a first sealing surface 701 with the first static seal 50; A second dynamic seal 80 is connected to the connection seat 30 , surrounds the shaft sleeve 20 , rotates along with the connection seat 30 , and forms a second sealing surface 801 with the second static seal 60 ; and a plurality of third static seals 90, one connected to the left end surface of the outer box body 10 with the cooling water channel, one connected to the left end surface of the shaft sleeve 20, and one connected between the shaft sleeve 20 and the connecting seat 30; Specifically, during implementation, the shaft sleeve 20 is sleeved on the pump shaft 100 from left to right, the left end of the outer box body 10 with the cooling water channel is connected to the pump cover, and the left end of the shaft sleeve 20 is fitted with the impeller. The third static seal 90 ensures the sealing between the outer box body 10 with the cooling water channel and the pump cover, and the sealing between the shaft sleeve 20 and the impeller. The outer box body 10 with the cooling water channel and the left end of the sleeve 20 first contact the medium. Since the part contacting the medium is fluoroplastic, it has good corrosion resistance and a relatively long service life. Moreover, compared with alloy steel, fluoroplastic is relatively soft. During assembly, the various parts will not collide with each other, and the assembly is relatively convenient and easy to grasp the assembly accuracy. The first static seal 50 and the first dynamic seal 70 block to form a first seal; circulating cooling water is introduced from the outer box 10 with a cooling water channel, and the cooling water has pressure to form a second seal; the second static seal 60 and the second dynamic seal 80 block to form a third seal; the third static seal 90 on the connecting seat 30 forms a fourth seal; multiple blocking seals have relatively good sealing performance; A limiting member 40 is provided to position the connection seat 30. When the connection seat 30, the shaft sleeve 20, the first dynamic seal 70 and the second dynamic seal 80 rotate together with the pump shaft 100, the connection seat 30 will not deviate in direction, so that the second sealing surface 801 is always in contact, the reliability of the structure is good, and the sealing performance is guaranteed; Another embodiment: like Figure 1 , Figure 2 , Figure 7 As shown; during implementation, the outer box body 10 with a cooling water channel includes: a main body 12, with the stepped through hole 11 in the middle; three pipe openings 13, connected to the main body 12 at intervals, with a through groove 13-1 between the pipe opening 13 and the main body 12, one end of the through groove 13-1 passes through the pipe opening 13, and the other end passes through the main body 12, and is arranged between the first static seal 50 and the second static seal 60, and is connected with the stepped through hole 11; three first O-rings 14, connected one-to-one to the pipe opening 13, surrounding one end of the through groove 13-1; and three joints 15, connected one-to-one at the through groove 13-1, communicating with the through groove 13-1, pressing the first O-ring 14, and used to pass cooling water between the first static seal 50, the second static seal 60 and the shaft sleeve 20; The outer box 10 with the cooling water channel is made of fluoroplastics, which has good corrosion resistance and a relatively long service life; The stepped through hole 11 is provided to facilitate the connection of other components. Moreover, compared with alloy steel, the fluoroplastic is relatively soft in texture. When assembling, the components will not collide with each other, so the assembly is relatively convenient and the assembly accuracy is easy to grasp. The main body 12 and the nozzle 13 are integrally injection molded, and are connected by bolts inserted between the flange end of the main body 12 and the pump cover, so installation and disassembly are convenient. A first O-ring 14 is provided, made of fluororubber, to ensure the sealing between the pipe opening 13 and the joint 15; The joint 15 is a common structure in the prior art, such as a water nozzle, which is threadedly connected to the through groove 13-1 and is used to connect a cooling water pipe; Connect the cooling water pipe through the joint 15, and pass the pressurized cooling water, for example, 0.6MPa pressure, between the first static seal 50, the second static seal 60 and the shaft sleeve 20, which can not only achieve the purpose of flushing, but also form a water seal, play a sealing role, and prevent the medium from entering and generating crystals; Another embodiment: like Figure 1 , Figure 3 , Figure 4 , Figure 7 As shown; during implementation, the shaft sleeve 20 includes: a first insert 21, which is sleeved on the pump shaft 100 from left to right; a second insert 22, which is sleeved on the left end of the first insert 21 and connected to the left end of the first insert 21; and a first inlay layer 23, which is made of fluoroplastic and wraps a part of the first insert 21 and the second insert 22, and the right end of the first inlay layer 23 forms a stepped structure with the right end of the first insert 21; The first insert 21 and the second insert 22 are made of alloy steel and are welded to each other. The first insert 21 and the second insert 22 are provided to ensure the structural strength of the sleeve 20. The first insert 21 has a first stepped groove 21-1 and a second stepped groove 21-2 on the left end, a first groove 21-3 on the right end, and an external thread 21-4 on the outer circle at the middle position; the second insert 22 has a plurality of first through holes 22-1 and a third stepped groove 22-2, and the first through hole 22-1 is connected to the third stepped groove 22-2; the first stepped groove 21-1, the second stepped groove 21-2, the first groove 21-3, the external thread 21-4, the first through hole 22-1 and the third stepped groove 22-2 are provided, which increases the contact area with the first inlay layer 23, so that the connection reliability between the first inlay layer 23 and the first insert 21 and the second insert 22 is good and will not fall off and separate; The left end surface of the first inlaid layer 23 is connected to the third static seal 90, and the outer circle is provided with a labyrinth seal groove 23-1, and the middle part is provided with a fourth stepped groove 23-2 and three second grooves 23-3, and the fourth stepped groove 23-2 and the second groove 23-3 are connected to the first dynamic seal 70; a labyrinth seal groove 23-1 is provided, by Figure 1 or Figure 7 As shown by the arrow in the figure, the medium first contacts the outer box body 10 with the cooling water channel and the left end of the sleeve 20. The labyrinth seal groove 23-1 can reduce the amount of the medium that continues to enter the stepped through hole 11, reducing the burden on the first static seal 50 and the first dynamic seal 70, and improving the sealing performance; the fourth stepped groove 23-2 and three second grooves 23-3 are provided, which are conducive to accommodating and connecting the first dynamic seal 70, and the assembly is relatively convenient. Moreover, the material of the first inlay layer 23 is fluoroplastic, which is relatively soft compared to alloy steel. During assembly, the first dynamic seal 70 and the first inlay layer 23 will not collide with each other, and the assembly is relatively convenient, and it is easy to grasp the assembly accuracy; Another embodiment: like Figure 1 , Figure 5 , Figure 6 , Figure 7 As shown; during implementation, the connecting seat 30 includes: a third insert 31, which is sleeved on the shaft sleeve 20 from right to left, and the third insert 31 has a fifth stepped groove 31-1 and a second through hole 31-2, the fifth stepped groove 31-1 is connected to the second through hole 31-2, and the second through hole 31-2 contacts the shaft sleeve 20; a second inlaid layer 32, made of fluoroplastic, connected to the third insert 31, arranged at the fifth stepped groove 31-1, connecting the third static seal 90 and the second dynamic seal 80, the second inlaid layer 32 contacts the first inlaid layer 23 and the right end of the first insert 21, and the second inlaid layer 32 also has three third grooves 32-1; and a plurality of set screws 33, which are arranged at intervals, threadedly connected to the right end of the third insert 31, one-to-one penetrate the third through hole 21-5 on the right end of the first insert 21, and abut against the pump shaft 100; The third insert 31 is made of alloy steel, which ensures the structural strength of the connecting seat 30; A fifth stepped groove 31 - 1 is provided to increase the contact area with the second inlay layer 32 , so that the connection reliability between the second inlay layer 32 and the third inlay 31 is better and will not fall off and separate; The second through hole 31-2 is provided, which is conducive to assembly and positioning with the shaft sleeve 20, and the assembly is relatively convenient; The second inlay layer 32 is connected to the third static seal 90 and the second dynamic seal 80, and the material of the second inlay layer 32 is fluoroplastics. Compared with alloy steel, fluoroplastics are relatively soft. During assembly, the second dynamic seal 80 and the second inlay layer 32 will not collide with each other, so the assembly is relatively convenient and the assembly accuracy is easy to control. The number of the set screws 33 is three, for example, hexagon socket head screws, which are used to connect the third insert 31 and the pump shaft 100 so that the pump shaft 100 can rotate together with the connecting seat 30; Another embodiment: like Figure 1 , Figure 7 As shown; when implemented, the limiter 40 includes: a pressing block 41, connected to the right end of the outer box 10 with the cooling water channel, blocking the connecting seat 30; and a stopper 42, connected to the pressing block 41, arranged between the pressing block 41 and the set screw 33, plugged into the fourth groove 31-3 on the third insert 31, and having a clearance fit with the fourth groove 31-3; The pressing block 41 is made of fluoroplastic and is annular in structure. It is connected to the right end of the outer box 10 with the cooling water channel by a cross-slot pan head self-tapping screw. It is easy to install and disassemble and is used to block the connecting seat 30. The stopper 42 is an arc-shaped block, which is connected to the pressing block 41 by a cross-slot pan head self-tapping screw, and is clearance-matched with the fourth groove 31-3. The stopper 42 forms a guide, so that when the connecting seat 30 rotates, the direction will not be deviated, and the second sealing surface 801 is always in contact, the reliability of the structure is good, and the sealing is guaranteed; Another embodiment: like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown; in implementation, the first static seal 50 and the second static seal 60 have the same structure, both comprising: a static ring body 51, connected in the stepped through hole 11, surrounding the shaft sleeve 20, and spaced apart from the shaft sleeve 20; and a second O-ring 52, made of fluororubber, connected to the outer circle of the static ring body 51, and disposed between the static ring body 51 and the outer box body 10 having the cooling water channel; The static ring body 51 is made of silicon carbide and is formed by pressureless sintering. It fits in the stepped through hole 11, and a small protrusion (e.g., a square protrusion) is provided on one side wall of the static ring body 51, which is plugged into a small groove on the outer box body 10 with a cooling water channel, so that the static ring body 51 is positioned. When the static ring body 51 contacts the dynamic ring body 71, the rotation of the dynamic ring body 71 will not cause the static ring body 51 to rotate, which is conducive to the first sealing surface 701 and the second sealing surface 801 always fitting together, thereby ensuring the sealing performance. The second O-ring 52 is made of fluororubber to ensure sealing performance; The first dynamic seal 70 and the second dynamic seal 80 have the same structure, and both include: a dynamic ring body 71, which forms the first sealing surface 701 or the second sealing surface 801 with the static ring body 51, and one side wall of the dynamic ring body 71 has three fifth grooves 71-1; a third O-ring 72, made of fluororubber, arranged between the dynamic ring body 71 and the shaft sleeve 20, or arranged between the dynamic ring body 71 and the connecting seat 30; and a corrugated spring 73, when connected between the dynamic ring body 71 and the shaft sleeve 20, the positioning foot 73-1 on the corrugated spring 73 is plugged into the second groove 23-3 and the fifth groove 71-1, and when connected between the dynamic ring body 71 and the connecting seat 30, the positioning foot 73-1 on the corrugated spring 73 is plugged into the third groove 32-1 and the fifth groove 71-1; The material of the dynamic ring body 71 is silicon carbide, and it is formed by pressureless sintering. A fifth groove 71-1 is provided on one side wall, and a first sealing surface 701 and a second sealing surface 801 are formed between the other side wall and the other side wall of the static ring body 51, thereby ensuring sealing performance. The third O-ring 72 is made of fluororubber to ensure sealing performance; The corrugated spring 73 is a common structure in the prior art, and is made of Hastelloy, for example, a three-corrugated spring, which has the function of elastic support, so that the first sealing surface 701 and the second sealing surface 801 are always in contact, thereby ensuring the sealing performance; The positioning foot 73-1 on the corrugated spring 73 has a square convex edge, which is plugged into the second groove 23-3 and the fifth groove 71-1, and plugged into the third groove 32-1 and the fifth groove 71-1, and has good positioning reliability; Another embodiment: like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown; during implementation, the third static seal 90 is an O-ring made of fluororubber to ensure sealing performance; Structure in the prior art: See Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7The pump shaft 100, the pump cover and the impeller are common structures in the prior art, which are not the inventive point of the present invention. They are only for better describing the present invention and facilitating understanding of the technical solution of the present invention. After reading the disclosed content, ordinary technicians in the field can directly and unambiguously know how to set them without creative labor or excessive experiments. The molding method between the insert and the inlay layer, for example, is to inject the heated and melted fluoroplastic into the mold cavity by high pressure, and obtain the molded product after cooling and solidification. The molding process can be roughly divided into six stages, mold closing (with the insert in the mold cavity), injection, pressure holding, cooling, mold opening, and product removal. The above process is repeated to continuously produce the assembly of the insert and the inlay layer, which is common knowledge; The working principle is as follows: the shaft sleeve 20 is sleeved on the pump shaft 100 from left to right, the left end of the outer box body 10 with the cooling water channel is connected to the pump cover, the left end of the shaft sleeve 20 is fitted with the impeller, and the third static seal 90 ensures the sealing between the outer box body 10 with the cooling water channel and the pump cover, and the sealing between the shaft sleeve 20 and the impeller; The outer box body 10 with the cooling water channel and the left end of the sleeve 20 first contact the medium. Since the part contacting the medium is fluoroplastic, it has good corrosion resistance and a relatively long service life. Moreover, compared with alloy steel, fluoroplastic is relatively soft. During assembly, the various parts will not collide with each other, and the assembly is relatively convenient and easy to grasp the assembly accuracy. The first static seal 50 and the first dynamic seal 70 block to form a first seal; circulating cooling water is introduced from the outer box 10 with a cooling water channel, and the cooling water has pressure to form a second seal; the second static seal 60 and the second dynamic seal 80 block to form a third seal; the third static seal 90 on the connecting seat 30 forms a fourth seal; multiple blocking seals have relatively good sealing performance; A limiting member 40 is provided to position the connection seat 30. When the connection seat 30, the shaft sleeve 20, the first dynamic seal 70 and the second dynamic seal 80 rotate together with the pump shaft 100, the connection seat 30 will not deviate in direction, so that the second sealing surface 801 is always in contact, the reliability of the structure is good, and the sealing performance is guaranteed; In the description, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicating directions or positional relationships are based on the positional relationships described in the drawings and are only for the convenience of description or simplified description, rather than indicating specific directions that must be possessed; the operation process described in the embodiments is not an absolute usage procedure and may be adjusted accordingly in actual use; Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the relevant field; the words "first", "second" and similar words used in the specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantity limitation, but indicate the existence of at least one, which needs to be determined according to the content of the embodiment; The above is only a preferred specific implementation method, but the scope of protection is not limited to it. Any equivalent replacement or change made according to the technical solution and its inventive concept within the technical scope disclosed by any technician familiar with this technical field should be covered by the scope of protection.

Claims

1. Non-metallic mechanical seal for high temperature corrosive and easy to crystallize solid phase particle medium, characterized by: include: The outer box body with cooling water channel is made of fluoroplastic, the left end of which is in direct contact with the medium, the middle part of the outer box body with cooling water channel has a stepped through hole, the stepped through hole is penetrated by the pump shaft, and the outer box body with cooling water channel is spaced apart from the pump shaft; A shaft sleeve is sleeved on the pump shaft from left to right, is arranged at the stepped through hole, is spaced apart from the outer box body with the cooling water channel, and both ends of the shaft sleeve protrude from the stepped through hole, and the left end of the shaft sleeve is made of fluoroplastic and is in direct contact with the medium; A connecting seat is sleeved on the shaft sleeve from right to left, the left end of the connecting seat penetrates the stepped through hole, and is spaced apart from the outer box body with the cooling water channel, and the right end is arranged outside the stepped through hole and connected to the pump shaft. When the pump shaft rotates, the connecting seat and the shaft sleeve rotate together with the pump shaft; A limiting member, connected to the outer box body with the cooling water channel, and used for blocking and limiting the connecting seat; A first static seal is connected to the outer box body with the cooling water channel, is arranged in the stepped through hole, surrounds the shaft sleeve, and is spaced apart from the shaft sleeve; A second static seal is connected to the outer box body with the cooling water channel, is disposed in the stepped through hole, surrounds the shaft sleeve, is spaced apart from the shaft sleeve, and is spaced apart from the first static seal; A first dynamic seal, connected to the shaft sleeve, rotates with the shaft sleeve, and forms a first sealing surface with the first static seal; A second dynamic seal is connected to the connection seat, surrounds the shaft sleeve, rotates with the connection seat, and forms a second sealing surface with the second static seal; And a plurality of third static seals, one connected to the left end surface of the outer box body with the cooling water channel, one connected to the left end surface of the shaft sleeve, and one connected between the shaft sleeve and the connecting seat.

2. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 1, characterized in that: The outer box body with cooling water channel comprises: a main body, the middle part of which has the stepped through hole; Three pipe openings are connected to the main body at intervals, a through groove is provided between the pipe opening and the main body, one end of the through groove passes through the pipe opening, and the other end of the through groove passes through the main body, and is arranged between the first static seal and the second static seal, and communicates with the stepped through hole; Three first O-rings, connected one-to-one to the pipe opening, surrounding one end of the through groove; And three joints are connected one-to-one at the through groove, communicated with the through groove, press the first O-ring, and are used to pass cooling water between the first static seal, the second static seal and the shaft sleeve.

3. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 2, characterized in that: The shaft sleeve includes: a first insert, which is sleeved on the pump shaft from left to right; a second insert, which is sleeved on the left end of the first insert and connected to the left end of the first insert; and a first inlaid layer, which is made of fluoroplastic and wraps part of the first insert and the second insert, and the right end of the first inlaid layer forms a stepped structure with the right end of the first insert.

4. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 3, characterized in that: The first insert has a first stepped groove and a second stepped groove on the left end, a first groove on the right end, and an external thread on the outer circle at the middle position; The second insert has a plurality of first through holes and a third stepped groove, and the first through holes are connected to the third stepped groove; The left end surface of the first inlaid layer is connected to the third static seal, the outer circle is provided with a labyrinth seal groove, the middle part is provided with a fourth stepped groove and three second grooves, and the first dynamic seal is connected to the fourth stepped groove and the second groove.

5. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 4, characterized in that: The connecting seat comprises: a third insert, which is sleeved on the shaft sleeve from right to left, wherein the third insert has a fifth stepped groove and a second through hole, wherein the fifth stepped groove is connected to the second through hole, and the second through hole contacts the shaft sleeve; The second inlay layer is made of fluoroplastic, connected to the third inlay, arranged at the fifth stepped groove, connecting the third static seal and the second dynamic seal, the second inlay layer is in contact with the first inlay layer and the right end of the first inlay, and the second inlay layer also has three third grooves; And a plurality of set screws are arranged at intervals, threadedly connected to the right end of the third insert, penetrate the third through hole on the right end of the first insert one by one, and abut against the pump shaft.

6. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 5, characterized in that: The limiting member includes: a pressure block connected to the right end of the outer box body with the cooling water channel to block the connecting seat; and a stopper connected to the pressure block, arranged between the pressure block and the fixing screw, inserted into the fourth groove on the third insert, and loosely matched with the fourth groove.

7. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 5, characterized in that: The first static seal and the second static seal have the same structure, and both include: a static ring body, connected in the stepped through hole, surrounding the shaft sleeve, and spaced apart from the shaft sleeve; and a second O-ring, made of fluororubber, connected to the outer circle of the static ring body, and arranged between the static ring body and the outer box body with the cooling water channel.

8. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 7, characterized in that: The first dynamic seal and the second dynamic seal have the same structure, and both include: a dynamic ring body, forming the first sealing surface or the second sealing surface with the static ring body, and the side wall of the dynamic ring body has three fifth grooves; A third O-ring, made of fluororubber, is disposed between the moving ring body and the shaft sleeve, or between the moving ring body and the connecting seat; And a corrugated spring, when connected between the moving ring body and the shaft sleeve, the positioning feet on the corrugated spring are plugged into the second groove and the fifth groove; when connected between the moving ring body and the connecting seat, the positioning feet on the corrugated spring are plugged into the third groove and the fifth groove.

9. The non-metallic mechanical seal for high temperature corrosive and easily crystallized solid-phase particle-containing media according to claim 8, characterized in that: The third static seal is an O-ring made of fluororubber.

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