Sealing structure and sealing method of AB valve

Abstract

The invention provides a sealing structure of an AB valve, which comprises a main valve body, a main valve plate, a sealing structure and a sealing structure, an auxiliary valve plate matched with the main valve plate is arranged on the auxiliary valve body; a locking assembly; a sealing ring; and an inflation assembly. According to the sealing structure of the AB valve, the locking assembly is used for enabling the main valve body and the auxiliary valve body to be matched, during material conveying, the air inflation assembly is used for deflating the sealing ring so that a gap can be formed between the sealing ring and the main valve plate or the auxiliary valve plate, the main valve plate or the auxiliary valve plate can be turned over to conduct material conveying operation, meanwhile, damage to the sealing ring is reduced, and when material conveying is stopped, the sealing ring is not damaged. The main valve plate and the auxiliary valve plate are turned over to be located at the position of the sealing ring, the sealing ring is inflated through the inflation assembly, so that the main valve body or the auxiliary valve body forms an independent sealing valve body, and then a product is stored in a high sterile space all the time; and the design of the inflation assembly is matched with the sealing ring structure on the main valve body, so that the higher sealing grade requirement can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of AB valves, and in particular to a sealing structure and a sealing method of an AB valve. Background Art

[0002] AB valves are mainly used to transfer drugs between two sterile environments. They are often used in the pharmaceutical industry to transfer drugs in a sterile manner to reduce the contamination of drugs by microorganisms, thereby improving the stability and quality of drugs.

[0003] The AB valve, also known as the "split butterfly valve", is mainly composed of an α valve (active valve) and a β valve (passive valve). During the feeding process, the α valve and the β valve are connected together through fasteners, and then the valve is opened to feed the material. When the feeding is completed, the valve is closed. At this time, the two separately sealed valve bodies are separated to improve the sealing of the product.

[0004] However, during aseptic transfer using the AB valve, some drug powder will remain between the valves of the AB valve, and as the frequency of drug transfer increases, the valve switching times increase, and the sealing ring will inevitably be dry-ground during the valve flipping process, causing wear on the sealing ring, which in turn leads to poor contact between the valve and the sealing ring, reducing the sealing of the valve body and affecting the effect of aseptic transfer. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problems in the prior art and to solve the problem of sealing performance of the AB valve.

[0006] In order to achieve the above object, the present invention can be implemented through the following technical solutions: a sealing structure of an AB valve, comprising:

[0007] A main valve body, wherein a main valve plate is arranged on the main valve body;

[0008] A secondary valve body, on which a secondary valve plate matching the main valve plate is disposed;

[0009] A locking assembly, wherein the locking assembly is disposed between the main valve body and the auxiliary valve body so as to engage the main valve body and the auxiliary valve body;

[0010] Sealing rings, which are respectively arranged on the main valve body and the auxiliary valve body and matched with the main valve plate and the auxiliary valve plate, and an air flow channel is opened in the sealing ring;

[0011] An inflatable component is communicated with the air flow channel of the sealing ring to control the inflation or deflation of the sealing ring.

[0012] In the embodiment of the present invention, a support portion is provided on the sealing ring, a tube body connected to the inflation assembly is provided on the support portion, inclined portions are provided on both sides of the support portion, and the inclined portions cooperate with the main valve body or the auxiliary valve body.

[0013] In the embodiment of the present invention, arc-shaped portions are symmetrically arranged on the sealing ring, a fitting portion is arranged between two arc-shaped portions, and the fitting portion abuts against the main valve plate or the auxiliary valve plate.

[0014] In the embodiment of the present invention, the locking assembly comprises a first clamping block, a second clamping block, a third clamping block, a fourth clamping block and a locking handle, wherein the first clamping block and the second clamping block are fixed to the main valve body, and the third clamping block and the fourth clamping block are fixed to the auxiliary valve body;

[0015] Wherein, a clamping rod is arranged on the locking handle, and the clamping rod passes through the third clamping block and the fourth clamping block, and is located between the first clamping block and the second clamping block for locking and fixing.

[0016] In the embodiment of the present invention, a support block is arranged between the first block and the second block, and the support block is provided with an exit slideway, a second slideway and a first slideway which are interconnected from high to low in sequence;

[0017] The clamping rod is provided with a round table which is located and slides in the supporting block to control the main valve body and the auxiliary valve body to achieve locking, clearance or separation.

[0018] In an embodiment of the present invention, the table is located on the second slide, so that a gap appears between the main valve body and the auxiliary valve body to form a sterilization space, and the main valve body is respectively provided with a steam inlet and a condensate outlet connected to the sterilization space, and a sterilization O-ring is provided between the main valve body and the auxiliary valve body.

[0019] In the embodiment of the present invention, a main shaft flange is arranged on the main valve body, a handle switch engaging with the main valve plate is arranged on the main shaft flange, and a limit platform is arranged on the main shaft flange;

[0020] The auxiliary valve body is provided with an auxiliary shaft flange matched with the auxiliary valve plate, and the auxiliary shaft flange is provided with a protective cover.

[0021] In the embodiment of the present invention, both the main valve plate and the auxiliary valve plate are provided with a conical support portion.

[0022] In an embodiment of the present invention, the inflation component includes an inflation hood, on which an inflation button, an exhaust button and an air pipe are respectively provided, an inflation sealing ring connecting port connected to the sealing ring is provided between the inflation button and the exhaust button, and the inflation button cooperates with the air pipe.

[0023] A sealing method for an AB valve sealing structure specifically comprises the following steps:

[0024] SO1. Assemble the main valve body to the auxiliary valve body and lock it with the locking assembly so that the main valve plate abuts against the auxiliary valve plate;

[0025] SO2. Press the deflation button to deflate the sealing ring. At this time, a gap is created between the sealing ring and the main valve plate and the auxiliary valve plate. Then, the main valve plate and the auxiliary valve plate are controlled by the handle switch to flip over for feeding;

[0026] SO3. After the feeding is completed, the handle switch drives the main valve plate and the auxiliary valve plate to be flush with the sealing ring respectively, and then press the inflation button, the gas enters from the air pipe and fills into the sealing ring along the inflation sealing ring connection port;

[0027] SO4. The arc-shaped portion and the fitting portion of the sealing ring are squeezed and expanded by the gas to abut against the annular outer wall of the main valve plate or the auxiliary valve plate, so that the main valve body and the auxiliary valve body form an independent sealing valve body.

[0028] Compared with the prior art, the advantages of the present application are as follows: the locking assembly is utilized to match the main valve body with the auxiliary valve body, and when feeding materials, the sealing ring is deflated by the inflation assembly to create a gap between the sealing ring and the main valve plate or the auxiliary valve plate, so as to facilitate the flipping of the main valve plate or the auxiliary valve plate for feeding operations, while also reducing damage to the sealing ring caused by dry grinding. When the feeding is stopped, the main valve plate and the auxiliary valve plate are flipped over and positioned at the sealing ring, and the sealing ring is inflated by the inflation assembly to form an independent sealing valve body with the main valve body or the auxiliary valve body, thereby solving the problem of hard sealing of the traditional AB valve and avoiding the wearing and falling of the sealing ring into the material to cause contamination, thereby ensuring that the product is always transported in a higher sterile space, and the design of the inflation assembly in conjunction with the sealing ring structure on the main valve body can achieve higher sealing level requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure on the front of the main body;

[0030] Figure 2 It is a schematic diagram of the back structure of the main valve body and the auxiliary valve body being separated;

[0031] Figure 3 This is a schematic diagram of the disassembled structure of the parts on the main valve body;

[0032] Figure 4 This is a schematic diagram of the disassembled structure of the parts on the auxiliary valve body;

[0033] Figure 5 It is a schematic diagram of the main body plane in the sterilized state;

[0034] Figure 6 yes Figure 5 The removal section FF in the figure;

[0035] Figure 7 yes Figure 6 Enlarged view of part A in the middle;

[0036] Figure 8 It is a schematic diagram of the connection and assembly of the sealing ring and the pipe body;

[0037] Fig. 9 It is a schematic diagram of the internal parts structure of the locking assembly disassembled on the main body;

[0038] Fig.10 It is a schematic diagram of the exploded structure of the parts in the locking assembly;

[0039] Fig.11 It is a schematic diagram of a half-section plane of the main valve body and the auxiliary valve body when the valve plates in the main valve body and the auxiliary valve body are open;

[0040] Fig.12 It is a structural diagram of the main valve plate and the auxiliary valve plate;

[0041] Fig.13 It is a schematic diagram of the internal parts assembly structure of the inflation cover in the inflation assembly in a partial section;

[0042] Fig.14 yes Fig.13 Enlarged view of part B in the middle.

[0043] Description of reference numerals:

[0044] 1. Subject;

[0045] 2. Main valve body; 21. Handle switch; 22. Main valve plate; 23. Switch latch; 24. Spindle flange; 241. Limiting platform; 25. Condensate outlet; 26. Steam inlet;

[0046] 3. Locking assembly; 31. First clamping block; 32. Second clamping block; 33. Locking handle; 331. Boss; 34. Third clamping block; 35. Fourth clamping block; 36. Clamping rod; 361. Round table; 362. Square block; 37. Support block; 371. First slideway; 372. Second slideway; 373. Exit slideway;

[0047] 4. Auxiliary valve body; 41. Protective cover; 42. Auxiliary valve plate; 43. Auxiliary shaft flange;

[0048] 5. Inflatable assembly; 51. Inflatable cover; 52. Inflatable button; 53. Exhaust button; 54. Air pipe; 55. Inflatable sealing ring connection port;

[0049] 6. Sealing ring; 61. Arc-shaped portion; 62. Fitting portion; 63. Tube body; 64. Air flow channel; 65. Support portion; 66. Inclined portion;

[0050] 7. Sterilization O-ring; 71. Sterilization space; 91. Card table; 92. Polished rod part; 93. Conical support part. DETAILED DESCRIPTION

[0051] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention.

[0052] like Figure 1-14 As shown, a sealing structure of an AB valve includes:

[0053] A main valve body 2, on which a main valve plate 22 is disposed;

[0054] Auxiliary valve body 4, on which is disposed an auxiliary valve plate 42 that matches with the main valve plate 22;

[0055] The locking assembly 3 is arranged between the main valve body 2 and the auxiliary valve body 4 so as to make the main valve body 2 and the auxiliary valve body 4 engage with each other;

[0056] The sealing ring 6 is respectively arranged on the main valve body 2 and the auxiliary valve body 4, and cooperates with the main valve plate 22 and the auxiliary valve plate 42. An air flow channel 64 is opened in the sealing ring 6;

[0057] The inflatable component 5 is communicated with the air flow channel 64 of the sealing ring 6 to control the inflation or deflation of the sealing ring 6.

[0058] Specifically, the main valve body 2 and the auxiliary valve body 4 are engaged with each other, and then the two are locked by the locking assembly 3 to form a main body 1, wherein the main valve body 2 is an α valve (active valve), and the auxiliary valve body 4 is a β valve (passive valve). When no material is fed, the main valve body 2 and the auxiliary valve body 4 are both independent sealing valve bodies. At this time, the sealing ring 6 is in an inflated state and abuts against the main valve plate 22 or the auxiliary valve plate 42 to improve the sealing effect of the two sealing valve bodies, and the pressure resistance of a single valve body can reach between 1bar and 2bar. When material feeding is required, the main valve body 2 is engaged with the auxiliary valve body 4, and the locking assembly 3 is locked so that the main valve plate 22 and the auxiliary valve plate 42 are pressed against each other, and the inflation component 5 deflates the sealing ring 6. At this time, the sealing ring 6 shrinks and a gap is generated between the main valve plate 22 or the auxiliary valve plate 42, so that the main valve plate 22 pushes the auxiliary valve plate 42 to flip over to achieve aseptic feeding. At the same time, the retracted sealing ring 6 reduces the wear of the sealing ring 6 caused by the dry grinding seal with the main valve plate 22 or the auxiliary valve plate 42 and detaches from the material to cause pollution, thereby improving the service life and sealing effect of the sealing ring 6. Among them, the sealing ring 6 is divided into two groups and is respectively clamped on the main valve body 2 or the auxiliary valve body 4.

[0059] As an embodiment further provided by the present invention, a support portion 65 is provided on the sealing ring 6, and a tube body 63 connected to the inflation component 5 is provided on the support portion 65. Inclined portions 66 are provided on both sides of the support portion 65, and the inclined portions 66 cooperate with the main valve body 2 or the auxiliary valve body 4.

[0060] Specifically, the cross section of the support portion 65 is T-shaped (eg Figure 7 As shown), the inclined portions 66 are located on both sides of the support portion 65, and the support portion 65 and the inclined portions 66 are used to improve the connection and fixing effect between the sealing ring 6 and the main valve body 2 or the auxiliary valve body 4. When the sealing ring 6 is inflated, the gas in the inflation component 5 is led by the tube body 63 to enter the sealing ring 6, so that the sealing ring 6 expands and presses against the main valve plate 22 and the auxiliary valve plate 42, thereby improving the sealing effect of the main valve body 2 and the auxiliary valve body 4.

[0061] As a further embodiment of the present invention, arc-shaped portions 61 are symmetrically provided on the sealing ring 6 , a fitting portion 62 is provided between the two arc-shaped portions 61 , and the fitting portion 62 abuts against the main valve plate 22 or the auxiliary valve plate 42 .

[0062] Specifically, during the inflation process of the sealing ring 6, gas enters the air flow channel 64. At this time, the sealing ring 6 will be squeezed and expanded by the gas, and its arc-shaped portion 61 will pre-abut against the annular outer wall of the main valve plate 22 or the auxiliary valve plate 42. The inflated fitting portion 62 will gradually approach the annular outer wall. Due to the presence of air in the fitting portion 62, the two arc-shaped portions 61 will extend outward to increase the fitting area of ​​the sealing ring 6, thereby further improving the sealing effect on the main valve plate 22 and the auxiliary valve plate 42.

[0063] As a further embodiment of the present invention, the locking assembly 3 includes a first clamping block 31, a second clamping block 32, a third clamping block 34, a fourth clamping block 35 and a locking handle 33, the first clamping block 31 and the second clamping block 32 are fixed on the main valve body 2, and the third clamping block 34 and the fourth clamping block 35 are fixed on the auxiliary valve body 4;

[0064] Among them, a clamping rod 36 is provided on the locking handle 33, the clamping rod 36 passes through the third clamping block 34 and the fourth clamping block 35, and is locked and fixed between the first clamping block 31 and the second clamping block 32. A square block 362 is provided at the end of the clamping rod 36, and the locking handle 33 is engaged with the square block 362 to cooperate with the clamping rod 36.

[0065] Specifically, the first clamping block 31 and the second clamping block 32 are a group, and there is a gap between the first clamping block 31 and the second clamping block 32 to form a first installation space, the installation plate on the outside of the main valve body 2 is fixed in the first installation space, the third clamping block 34 and the fourth clamping block 35 are a group, and there is a gap between the third clamping block 34 and the fourth clamping block 35 to form a second installation space, the auxiliary valve plate 42 is fixed at the second installation space, and one end of the clamping rod 36 is located at the third clamping block 34 and the fourth clamping block 35 for rotation, and the other end thereof can be engaged in the first installation space to enable the main valve body 2 and the auxiliary valve body 4 to be engaged and locked.

[0066] As a further embodiment of the present invention, a support block 37 is provided between the first block 31 and the second block 32, and the support block 37 is provided with an exit slide 373, a second slide 372 and a first slide 371 which are interconnected from high to low in sequence;

[0067] The clamping rod 36 is provided with a round platform 361 which is located and slides in the supporting block 37 to control the main valve body 2 and the auxiliary valve body 4 to achieve locking, clearance or separation.

[0068] Specifically, the support block 37 is clamped between the first clamping block 31 and the second clamping block 32. When locking, the round table 361 on the clamping rod 36 will slide along the outlet slide 373 and the second slide 372 to the first slide 371 in sequence. At this time, the main valve body 2 and the auxiliary valve body 4 are engaged and locked, and the feeding operation can be carried out. Furthermore, when the main valve body 2 and the auxiliary valve body 4 are engaged, the fitting part between the main valve body 2 and the auxiliary valve body 4 can be vacuumed through the steam inlet 26 or the condensate outlet 25. After the extraction is completed, the steam inlet 26 or the condensate outlet 25 is blocked to achieve a higher sealing level requirement. When sterilization is performed, the round table 361 will slide along the first slide 371 to the second slide 372, and the boss 331 of the locking handle 33 will be engaged in the circular groove of the third clamping block 34 to give the locking handle 33 a The boss 331 can be retracted in the locking handle 33 to achieve a certain abutment effect. At this time, there is a gap between the main valve body 2 and the auxiliary valve body 4, but the main valve body 2 and the auxiliary valve body 4 are still in a connected and sealed state and have not been completely separated, so as to facilitate steam sterilization of the plate surfaces of the main valve plate 22 and the auxiliary valve plate 42. When separation is performed, the round table 361 on the clamping rod 36 slides along the second slide 372 to the outlet slide 373, and the auxiliary valve body 4 can be pulled out and separated from the main valve body 2 through the locking handle 33. At the same time, the round table 361 will slide upward in the vertical direction to disengage from the support block 37. Furthermore, the outlet slide 373 is a vertical slide, and its slide opening faces the second slide 372. The second slide 372 is arc-shaped and connected to the first slide 371. It can be seen that the first slide 371 is the lowest and the outlet slide 373 is the highest point (such as Fig.10As shown), an arc-shaped wall is provided between the first slide 371 and the second slide 372 and between the second slide 372 and the exit slide 373 to facilitate the sliding of the round table 361.

[0069] As an embodiment further provided by the present invention, the cone 361 is located on the second slide 372, so that a gap appears between the main valve body 2 and the auxiliary valve body 4 to form a sterilization space 71, and the main valve body 2 is respectively provided with a steam inlet 26 and a condensate outlet 25 connected to the sterilization space 71, and a sterilization O-ring 7 is provided between the main valve body 2 and the auxiliary valve body 4.

[0070] Specifically, when the round table 361 slides onto the second slideway 372, there is a gap between the main valve body 2 and the auxiliary valve body 4 at this moment to form a sterilization space 71, and high-temperature steam enters the sterilization space 71 through the steam inlet 26 to steam sterilize the plate surfaces of the main valve plate 22 and the auxiliary valve plate 42, and the sterilized gas is discharged through the condensate outlet 25, so as to facilitate the aseptic transmission of subsequent products and improve the effect of aseptic transmission. Furthermore, during the steam sterilization process, the main valve body 2 and the auxiliary valve body 4 are completely separated, and the sterilization O-ring 7 is arranged between the two valve bodies to improve the sealing effect of the sterilization space 71, wherein the steam flow direction is as follows: Fig.13 As shown, it enters from the C end and exits from the D end.

[0071] As a further embodiment provided by the present invention, a main shaft flange 24 is provided on the main valve body 2, a handle switch 21 engaging with the main valve plate 22 is provided on the main shaft flange 24, and a limit platform 241 is provided on the main shaft flange 24;

[0072] The auxiliary valve body 4 is provided with an auxiliary shaft flange 43 matched with the auxiliary valve plate 42 , and a protective cover 41 is provided on the auxiliary shaft flange 43 .

[0073] Specifically, the handle clamp can control the rotation of the main valve plate 22, that is, control the switching of the main valve body 2 and the auxiliary valve body 4. The main shaft flange 24 is fixed to the main valve body 2 by bolts, and its limit platform 241 limits the rotation angle of the handle clamp. The auxiliary shaft flange 43 is fixed to the auxiliary valve body 4 by bolts, and the auxiliary valve plate 42 is located on the auxiliary shaft flange 43 and rotates. The protective cover plays the effect of protecting the auxiliary valve plate 42. Furthermore, a switch pin 23 is provided on the handle switch 21 to lock the main valve plate 22.

[0074] As a further embodiment of the present invention, both the main valve plate 22 and the auxiliary valve plate 42 are provided with a conical support portion 93 .

[0075] Specifically, the main valve plate 22 and the auxiliary valve plate 42 are composed of a plate body, a conical support portion 93, a light rod portion 92 and a clamping platform 91. The plate body is circular and cooperates with the main valve body 2 or the auxiliary valve body 4, and the cross-section of the conical support portion 93 is triangular. The triangular stable structure can improve the connection effect between the light rod portion 92 and the plate body. The clamping platform 91 can be connected to an external handle to drive the main valve plate 22 to rotate.

[0076] As an embodiment further provided by the present invention, the inflation component 5 includes an inflation hood 51, on which an inflation button 52, an exhaust button 53 and an air pipe 54 are respectively provided, and an inflation sealing ring connecting port 55 connected to the sealing ring 6 is provided between the inflation button 52 and the exhaust button 53, and the inflation button 52 cooperates with the air pipe 54.

[0077] Specifically, the inflation hood 51 is fitted with the main valve body 2 or the auxiliary valve body 4 to form an installation space, and the installation space is respectively provided with an inflation button 52, an air pipe 54 and an exhaust button 53. The air pipe 54 is connected to an external air source. When the inflation button 52 is pressed, the gas will be discharged from the inflation sealing ring connecting port 55 along the connecting end of the inflation button 52 into the tube body 63, and fill into the sealing ring 6 along the tube body 63, so that the sealing ring 6 expands and presses against the main valve plate 22 or the auxiliary valve plate 42 to form a higher sealing effect. However, when the sealing ring 6 needs to be exhausted, the exhaust button 53 is pressed, and the gas in the sealing ring 6 will be discharged at this time, so that the sealing ring 6 is in a contracted state.

[0078] The present invention also discloses a sealing method for an AB valve sealing structure, which specifically comprises the following steps:

[0079] SO1. Assemble the main valve body 2 onto the auxiliary valve body 4 and lock them by the locking assembly 3 so that the main valve plate 22 abuts against the auxiliary valve plate 42. At this time, the contacting surfaces of the main valve plate 22 and the auxiliary valve plate 42 are not sterilized.

[0080] SO2. Press the deflation button to deflate the sealing ring 6. At this time, a gap is generated between the sealing ring 6 and the main valve plate 22 and the auxiliary valve plate 42. Then, the main valve plate 22 is controlled by the handle switch 21 to link the auxiliary valve plate 42 to flip for feeding;

[0081] SO3. After the feeding is completed, the handle switch 21 drives the main valve plate 22 and the auxiliary valve plate 42 to be flush with the sealing ring 6 respectively, and then the inflation button 52 is pressed, and the gas enters from the gas pipe 54 and fills into the sealing ring 6 along the inflation sealing ring connection port 55;

[0082] SO4, the arc portion 61 and the contact portion 62 of the sealing ring 6 are squeezed and expanded by the gas to abut against the annular outer wall of the main valve plate 22 or the auxiliary valve plate 42, so that the main valve body 2 and the auxiliary valve body 4 form an independent sealing valve body.

[0083] The technical solution of the present invention provides a solution that is significantly different from the prior art to address the technical problem that the prior art solution is too single. The parts not involved in the technical solution of this application are the same as the prior art or can be implemented by using the prior art and will not be described in detail.

[0084] The technical solutions in the above embodiments have clearly and completely described the contents 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.

Claims

1. A sealing structure of an AB valve, characterized in that: include: A main valve body (2), wherein a main valve plate (22) is provided on the main valve body (2); An auxiliary valve body (4), wherein the auxiliary valve body (4) is provided with an auxiliary valve plate (42) that matches the main valve plate (22); A locking assembly (3), wherein the locking assembly (3) is arranged between the main valve body (2) and the auxiliary valve body (4) so ​​as to enable the main valve body (2) and the auxiliary valve body (4) to engage with each other; A sealing ring (6), wherein the sealing ring (6) is respectively arranged on the main valve body (2) and the auxiliary valve body (4), and cooperates with the main valve plate (22) and the auxiliary valve plate (42), and an air flow channel (64) is opened in the sealing ring (6); An inflatable component (5), wherein the inflatable component (5) is connected to the air flow channel (64) of the sealing ring (6) to control the inflation or deflation of the sealing ring (6).

2. The sealing structure of an AB valve according to claim 1, characterized in that: The sealing ring (6) is provided with a support portion (65), and the support portion (65) is provided with a tube body (63) connected to the inflation component (5). Inclined portions (66) are provided on both sides of the support portion (65), and the inclined portions (66) cooperate with the main valve body (2) or the auxiliary valve body (4).

3. A sealing structure of an AB valve according to claim 1 or 2, characterized in that: The sealing ring (6) is symmetrically provided with arc-shaped portions (61), a fitting portion (62) is provided between the two arc-shaped portions (61), and the fitting portion (62) is in contact with the main valve plate (22) or the auxiliary valve plate (42).

4. The sealing structure of an AB valve according to claim 1, characterized in that: The locking assembly (3) comprises a first clamping block (31), a second clamping block (32), a third clamping block (34), a fourth clamping block (35) and a locking handle (33); the first clamping block (31) and the second clamping block (32) are fixed on the main valve body (2), and the third clamping block (34) and the fourth clamping block (35) are fixed on the auxiliary valve body (4); Wherein, a clamping rod (36) is arranged on the locking handle (33), and the clamping rod (36) passes through the third clamping block (34) and the fourth clamping block (35), and is located between the first clamping block (31) and the second clamping block (32) for locking and fixing.

5. The sealing structure of an AB valve according to claim 4, characterized in that: A support block (37) is provided between the first clamping block (31) and the second clamping block (32), and the support block (37) is provided with an exit slideway (373), a second slideway (372) and a first slideway (371) which are connected to each other from high to low in sequence; The clamping rod (36) is provided with a round platform (361) which is located and slides in the supporting block (37) to control the main valve body (2) and the auxiliary valve body (4) to achieve locking, clearance or separation.

6. The sealing structure of an AB valve according to claim 5, characterized in that: The frustum (361) is located on the second slide (372), so that a gap appears between the main valve body (2) and the auxiliary valve body (4) to form a sterilization space (71); the main valve body (2) is respectively provided with a steam inlet (26) and a condensate outlet (25) connected to the sterilization space (71); a sterilization O-ring (7) is provided between the main valve body (2) and the auxiliary valve body (4).

7. The sealing structure of an AB valve according to claim 1, characterized in that: The main valve body (2) is provided with a main shaft flange (24), a handle switch (21) engaged with the main valve plate (22) is provided on the main shaft flange (24), and a limiting platform (241) is provided on the main shaft flange (24); The auxiliary valve body (4) is provided with an auxiliary shaft flange (43) matched with the auxiliary valve plate (42), and the auxiliary shaft flange (43) is provided with a protective cover (41).

8. The sealing structure of an AB valve according to claim 7, characterized in that: The main valve plate (22) and the auxiliary valve plate (42) are both provided with a bevel gear support portion (93).

9. The sealing structure of an AB valve according to claim 1, characterized in that: The inflation component (5) comprises an inflation cover (51), on which an inflation button (52), an exhaust button (53) and an air pipe (54) are respectively arranged, an inflation sealing ring connecting port (55) connected to the sealing ring (6) is arranged between the inflation button (52) and the exhaust button (53), and the inflation button (52) cooperates with the air pipe (54).

10. A sealing method for an AB valve, characterized in that: The sealing structure used for sealing the AB valve according to any one of claims 1 to 9 comprises the following steps: SO1. Assemble the main valve body (2) onto the auxiliary valve body (4) and lock them by means of the locking assembly (3) so that the main valve plate (22) abuts against the auxiliary valve plate (42); SO2. Press the deflation button to deflate the sealing ring (6). At this time, a gap is generated between the sealing ring (6) and the main valve plate (22) and the auxiliary valve plate (42). Then, the main valve plate (22) is controlled by the handle switch (21) to link the auxiliary valve plate (42) to flip over and feed the material. SO3. After the material feeding is completed, the handle switch (21) drives the main valve plate (22) and the auxiliary valve plate (42) to be flush with the sealing ring (6), and then the inflation button (52) is pressed, and the gas enters from the gas pipe (54) and is filled into the sealing ring (6) along the inflation sealing ring connection port (55); SO4, the arc-shaped portion (61) and the contact portion (62) of the sealing ring (6) are compressed and expanded by the gas to abut against the annular outer wall of the main valve plate (22) or the auxiliary valve plate (42), so that the main valve body (2) and the auxiliary valve body (4) form an independent sealing valve body.

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