Air seal type sealing friction-free pneumatic upward expansion valve

Abstract

The invention relates to the field of upward expansion valves, in particular to an air seal type sealing friction-free pneumatic upward expansion valve which comprises a valve body, a flange is arranged at the feeding end of the valve body, an annular groove is formed in an inner ring between the flange and the feeding end, a valve seat element is arranged in the annular groove and tightly attached to the inner side of the annular groove, and an air channel is formed in one side of the valve seat element. The air channel is communicated with a channel formed in the feeding end, and the channel is communicated with an air source connector formed in the outer ring of the feeding end. According to the invention, the bag body and the valve core are designed in a matched manner, the bag body is inflated with high-pressure gas to expand, the inner ring of the bag body is extruded on the surface of the valve core, the valve core realizes the sealing of the feeding end through the bag body, and some residual materials in the inner ring of the feeding end can be effectively extruded and sealed.

Description

Technical Field

[0001] The invention relates to the field of upward expansion valves, in particular to an air-sealed frictionless pneumatic upward expansion valve. Background Art

[0002] The upward discharge valve is a valve specially used for discharging materials from the bottom of reactors, storage tanks and other containers. The feed end of the upward discharge valve is connected to the bottom of the container. When the material needs to be discharged, it is executed through the cylinder on the valve body. Figure 2 As shown, the valve body is located at the top and the cylinder is located at the bottom. The output end of the cylinder pushes the valve stem upward, and the valve stem drives the valve core to move toward the inside of the container. At this time, the feed end of the expansion discharge valve is opened, and the material in the container flows along the feed end and is discharged from the discharge end of the valve body.

[0003] At present, the sealing principle of the upward-expanding discharge valves on the market is that the valve core moves to form a seal with the valve seat. When encountering hard objects or easily crystallized media, leakage is very likely to occur, that is, the material is stuck between the valve core and the valve seat, and a seal cannot be formed. In addition, there is a distance between the valve core and the discharge port to the container, and the material in this distance space is difficult to be stirred. That is, when the material is stirred and mixed in the container, the stirring cannot reach the material in this spatial position. The material is very easy to crystallize and solidify, thereby blocking the valve and the discharge port. When the discharge valve is opened to discharge the material, it is often necessary to manually remove the blocked crystals, which directly affects the production efficiency.

[0004] Therefore, in order to solve the above problems, an air-sealed frictionless pneumatic upward expansion valve is proposed. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the air-sealed frictionless pneumatic upward expansion valve described in the present invention comprises a valve body, a flange is provided at the feed end of the valve body, an annular groove is provided on the inner ring between the flange and the feed end, a valve seat core is provided in the annular groove, the valve seat core is arranged close to the inner side of the annular groove, and an air channel is provided on one side of the valve seat core, the air channel is connected to a channel provided inside the feed end, and the channel is connected to an air source interface provided on the outer ring of the feed end; The inner ring of the valve seat core is provided with a ring-shaped sac, which is arranged closely against the inner ring of the valve seat core, and the outer ring of the sac is provided with an air inlet hole, which is connected to the airway on the valve seat core, and the inner ring of the sac is closely attached to the outer ring of the valve core of the valve body.

[0007] Preferably, the cross section of the sac body is in the shape of two letter "C"s facing each other; the inner ring of the valve seat core is adapted to the shape of the sac body.

[0008] Preferably, the inner top surface and the inner bottom surface of the annular groove are both provided with a ring-shaped No. 1 slot; the upper surface and the lower surface of the capsule body are both provided with a ring-shaped No. 1 protrusion, and the No. 1 protrusion is embedded in the No. 1 slot.

[0009] Preferably, the upper surface and the lower surface of the inner ring of the valve seat core are provided with annular No. 2 grooves; the inner top and the inner bottom of the outer ring of the sac body are provided with annular No. 2 protrusions, which can be embedded in the No. 2 grooves.

[0010] Preferably, the inner ring of the capsule is provided with a ring-shaped No. 3 protrusion; the outer ring of the valve core is provided with a No. 1 recess adapted to the No. 3 protrusion, and the No. 1 recess is arranged in a ring shape.

[0011] Preferably, a sealing rod is provided inside the capsule body, the sealing rod is arranged opposite to the air inlet, one end of the sealing rod is arranged with an expanded diameter and fixed to the inner surface of the capsule body, and the other end of the sealing rod is arranged with a reduced diameter and is clearance-fitted in the air inlet; A second recess is also provided on the outer ring of the valve core. The second recess is arranged in a ring shape, and the diameter of the second recess is greater than the diameter of the first recess.

[0012] Preferably, the airway port close to the bag body is arranged in a flared shape, and a plug-in portion is provided outside the air inlet hole, and the shape of the plug-in portion is adapted to the shape of the flared portion of the airway.

[0013] Preferably, a liquid storage cavity is formed inside each of the No. 1 protrusions, and a discharge hole is formed on the outer surface of each of the No. 1 protrusions. The discharge holes are connected to the liquid storage cavities one by one, and the discharge holes are respectively arranged opposite to the No. 1 card slots.

[0014] Preferably, each of the No. 1 slots is provided with an insert adapted to the discharge hole, the No. 1 protrusion is embedded in the No. 1 slot, and the insert can be inserted into the discharge hole on the No. 1 protrusion.

[0015] Preferably, a ring-shaped limiting ring is provided on the inner side wall of the feed end, the limiting ring is arranged away from the flange, the inner end surface of the valve core is provided with a sleeve, and a valve stem connected to a spring is provided in the sleeve.

[0016] The present invention is beneficial in that: 1. In the present invention, the capsule and the valve core are designed to cooperate. The capsule is filled with high-pressure gas to expand. The inner circle of the capsule is pressed against the surface of the valve core. The valve core seals the feed end through the capsule and can effectively squeeze and seal some materials remaining in the inner circle of the feed end. 2. When the valve body is opened, the capsule shrinks and deforms, and the crystallized and hardened material easily separates from the valve core and the capsule, so that the subsequent material can smoothly enter the valve body from the container along the feed end.

[0017] 3. At the same time, there is no friction between the outer surface of the valve core and the inner ring of the feed end, and the rigid valve core is in contact with the soft bladder to seal, avoiding direct friction damage between the rigid valve core and the rigid valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the air-sealed frictionless pneumatic upward expansion valve of the present invention; Figure 2 is a cross-sectional view of the valve body of the present invention; Figure 3 It is a schematic diagram of the cooperation between the valve core and the limit ring in the present invention; Figure 4 It is a cross-sectional view of the matching of the flange and the valve body in the present invention; Figure 5 is a three-dimensional diagram of the capsule body of the present invention; Figure 6 is a cross-sectional view of the capsule body of the present invention; Figure 7 It is a partially enlarged schematic diagram of the cross section of the capsule in the present invention; Figure 8 It is a three-dimensional diagram of the matching of the valve core and the valve stem in the present invention; Fig. 9 is a cross-sectional view of the sleeve in the present invention; Fig.10 A three-dimensional diagram of the valve seat core of the present invention; Fig.11 It is a cross-sectional view of the valve seat core in the present invention; Fig.12 It is a partially enlarged schematic diagram of the cross section of the valve seat core in the present invention.

[0019] In the figure: 1. valve body; 2. flange; 3. annular groove; 4. valve seat core; 5. airway; 6. feed end; 7. passage; 8. air source interface; 9. capsule; 10. air inlet; 11. valve core; 12. cylinder; 13. frame; 14. valve stem; 15. No. 1 slot; 16. No. 1 protrusion; 17. No. 2 slot; 18. No. 2 protrusion; 19. No. 3 protrusion; 20. No. 1 recess; 21. sealing plug rod; 22. No. 2 recess; 23. plug-in part; 24. liquid storage chamber; 25. discharge hole; 26. insert; 27. limit ring; 28. sleeve; 29. ​​spring. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Reference Figure 1 - Fig.12, an air-sealed frictionless pneumatic upward expansion valve, comprising a valve body 1, a flange 2 is provided at the feed end 6 of the valve body 1, an annular groove 3 is provided in the inner ring between the flange 2 and the feed end 6, a valve seat core 4 is provided in the annular groove 3, the valve seat core 4 is arranged close to the inner side of the annular groove 3, and an air channel 5 is provided on one side of the valve seat core 4, the air channel 5 is communicated with a channel 7 provided inside the feed end 6, and the channel 7 is connected to an air source interface 8 provided on the outer ring of the feed end 6; The inner ring of the valve seat core 4 is provided with a ring-shaped capsule 9, which is arranged closely to the inner ring of the valve seat core 4, and the outer ring of the capsule 9 is provided with an air inlet hole 10, which is connected to the air passage 5 on the valve seat core 4, and the inner ring of the capsule 9 is closely attached to the outer ring of the valve core 11 of the valve body 1; In this embodiment, the air-sealed frictionless pneumatic upward expansion valve further includes a cylinder 12 disposed below the valve body 1. Figure 2 As shown, the upper end surface of the cylinder 12 is fixedly connected to the lower part of the valve body 1 through the frame 13, the output end of the cylinder 12 passes through the frame 13 and extends into the valve body 1, and is fixedly connected to the valve stem 14, the upper end of the valve stem 14 is fixedly connected to the valve core 11, and the valve core 11 is used to seal the feed end 6 of the valve body 1; In this embodiment, the gas source interface 8 can be connected to an external air pump through a pipeline, and the air pump can inject high-pressure gas into the capsule 9; The specific operation process of the air-sealed frictionless pneumatic upward expansion valve is as follows: In the process of opening the valve body 1, the external air pump is turned off and the gas in the capsule 9 is released. The capsule 9 elastically contracts into the annular groove 3, and then drives the cylinder 12. The output end of the cylinder 12 pushes up the valve stem 14. The valve stem 14 drives the valve core 11 to move upward. The valve core 11 is separated from the feed end 6 of the valve body 1. The feed end 6 is opened, and the material in the container enters along the feed end 6 and is discharged from the discharge end of the valve body 1. During the process of closing the valve body 1, the output end of the cylinder 12 pulls down the valve stem 14, and the valve stem 14 drives the valve core 11 to move downward, and the valve core 11 moves and resets to the feed end 6, and blocks the feed end 6. Then, the external air pump is driven, and the gas flows along the pipeline, the gas source interface 8, the channel 7, the airway 5 and the air inlet 10 in sequence, and is finally injected into the capsule 9. The inside of the capsule 9 expands due to the high-pressure gas, and the inner circle of the capsule 9 is squeezed on the surface of the valve core 11. At this time, the valve core 11 realizes the sealing of the feed end 6 through the capsule 9, and can effectively squeeze and seal some materials remaining in the inner circle of the feed end 6; When the valve body 1 is opened again, the capsule 9 shrinks and deforms, and the crystallized and hardened material is more likely to separate from the valve core 11 and the capsule 9, so that the subsequent material can smoothly enter the valve body 1 from the container along the feed end 6; At the same time, there is no friction between the outer surface of the valve core 11 and the inner circle of the feed end 6, and the rigid valve core 11 is in contact and sealed with the soft bladder 9, thereby preventing the rigid valve core 11 from being directly damaged by friction with the rigid valve body 1.

[0022] Reference Figure 1 - Fig.12 The cross section of the capsule 9 is in the shape of two letters "C" facing each other; the inner ring of the valve seat core 4 is adapted to the shape of the capsule 9; The shape of the sac 9 is set so that when the sac 9 is installed in the annular groove 3, the outer ring of the sac 9 can be buckled on the inner ring of the valve seat core 4, thereby fixing the sac 9 and the valve seat core 4, improving the stability between the sac 9 and the valve seat core 4, so that after the sac 9 is expanded by injecting gas, it can be stabilized in the annular groove 3.

[0023] Reference Figure 1 - Figure 7 The inner top surface and the inner bottom surface of the annular groove 3 are both provided with a ring-shaped No. 1 card groove 15; the upper surface and the lower surface of the capsule 9 are both provided with a ring-shaped No. 1 protrusion 16, and the No. 1 protrusion 16 is embedded in the No. 1 card groove 15; The sac body 9 is installed in the annular groove 3, and the two ring-shaped No. 1 protrusions 16 on the sac body 9 are embedded in the No. 1 groove 15, so as to constrain and stabilize the position between the sac body 9 and the annular groove 3, so that when the sac body 9 expands and deforms, the sac body 9 is firmly locked in the annular groove 3, so that the deformation of the sac body 9 can fully squeeze the outer ring of the valve core 11, thereby improving the sealing effect between the sac body 9 and the valve core 11.

[0024] Reference Figure 1 - Fig.12 The upper and lower surfaces of the inner ring of the valve seat core 4 are provided with a ring-shaped No. 2 clamping groove 17; the inner top and inner bottom of the outer ring of the capsule 9 are provided with a ring-shaped No. 2 protrusion 18, and the No. 2 protrusion 18 can be embedded in the No. 2 clamping groove 17; the No. 2 protrusion 18 is provided to cooperate with the No. 2 clamping groove 17, so as to further strengthen the connection stability between the capsule 9 and the valve seat core 4; The installation process of the valve seat core 4 and the capsule 9 is as follows: the flange 2 is fixedly connected to the feed port end face of the valve body 1 by means of bolts and nuts. When installing the valve seat core 4 and the capsule 9, the flange 2 needs to be removed in advance, and then the valve seat core 4 and the capsule 9 are assembled. The outer ring of the capsule 9 is wrapped on the inner ring of the valve seat core 4, so that the two No. 2 protrusions 18 are respectively embedded in the No. 2 card grooves 17, and the air inlet 10 of the capsule 9 is installed relative to the airway 5 on the valve seat core 4, and then the valve seat core 4 is installed together with the capsule 9 in the annular groove 3 at the feed end 6 position. At this time, the No. 1 protrusion 16 on the lower surface of the capsule 9 is embedded in the No. 1 card groove 15 on the inner bottom surface of the annular groove 3. After being installed in place, the flange 2 is then installed, and the annular groove 3 of the flange 2 is installed relative to the annular groove 3 at the feed end 6 position. At this time, the No. 1 protrusion 16 on the upper surface of the capsule 9 is embedded in the No. 1 card groove 15 at the inner top surface position, and finally the flange 2 and the feed end 6 are fixed together by bolts and nuts; The flange 2 and the valve body 1 together squeeze the valve seat core 4 and the sac 9 , squeezing the No. 2 protrusion 18 on the sac 9 into the No. 2 groove 17 , further improving the stability between the sac 9 and the valve seat core 4 .

[0025] Reference Figure 1 - Fig. 9 The inner ring of the capsule 9 is provided with a ring-shaped No. 3 protrusion 19; the outer ring of the valve core 11 is provided with a No. 1 recess 20 adapted to the No. 3 protrusion 19, and the No. 1 recess 20 is arranged in a ring shape; The third protrusion 19 provided on the inner ring of the capsule 9 not only plays a role in further sealing, but also can scrape off the material adhered to the outer ring of the valve core 11; The sealing effect of the No. 3 protrusion 19 is that the No. 3 protrusion 19 is pressed on the No. 1 concave portion 20 on the valve core 11 as the sac 9 expands and deforms, thereby increasing the contact area between the sac 9 and the valve seat core 4, thereby improving the sealing performance; Due to the scraping effect of the No. 3 protrusion 19, when no gas is injected into the sac 9, the No. 3 protrusion 19 still protrudes from the inner ring surface of the feed end 6 and can directly contact the outer ring of the valve core 11. When the valve body 1 is closed, the valve core 11 moves downward relative to the No. 3 protrusion 19, and the No. 3 protrusion 19 scrapes off the residual material on the outer ring of the valve core 11, so that the inner ring surface of the sac 9 can fully contact the outer ring surface of the valve core 11. The final effect is to improve the sealing between the valve core 11 and the sac 9, and can seal a higher pressure in the closed container.

[0026] Reference Figure 1 - Fig. 9 A sealing rod 21 is provided inside the capsule 9, and the sealing rod 21 is arranged opposite to the air inlet 10, and one end of the sealing rod 21 is arranged with an enlarged diameter and fixed to the inner surface of the capsule 9, and the other end of the sealing rod 21 is arranged with a reduced diameter and is clearance-fitted in the air inlet 10; The outer ring of the valve core 11 is also provided with a second recess 22, which is arranged in a ring shape, and the diameter of the second recess 22 is greater than the diameter of the first recess 20; Considering that the stirring and reaction of the materials in the container may take a long time, a long time will test the stability of the air pressure inside the capsule 9, that is, the capsule 9 can be in a relatively stable state for a long time without air leakage. Therefore, in order to ensure a stable environment inside the capsule 9, a sealing rod 21 and a second recess 22 are provided; When closing the valve body 1, the output end of the cylinder 12 performs two strokes. In the first stroke, the No. 1 concave portion 20 on the outer ring of the valve core 11 moves to a position opposite to the No. 3 protrusion 19, and then a sufficient amount of gas is injected into the capsule 9. After that, the second stroke is performed to move the No. 2 concave portion 22 on the outer ring of the valve core 11 to a position opposite to the No. 3 protrusion 19. At this time, the No. 2 concave portion 22 will further squeeze the capsule 9, so that the sealing insert inside the capsule 9 moves toward the air inlet 10, and finally the sealing insert will be plugged into the air inlet 10 to directly seal the capsule 9. When the valve body 1 is opened, the output end of the cylinder 12 performs only one stroke, the air source interface 8 is in an open state, the cylinder 12 pushes up the valve core 11, the valve core 11 directly separates from the capsule 9, and the capsule 9 is deflated and restored; The sealing plug rod 21 is directly plugged into and blocks the air inlet 10 , so that the capsule 9 can be stably sealed, so that the capsule 9 can be in a relatively stable state for a long time.

[0027] Reference Figure 1 - Fig.12 The port of the airway 5 near the capsule 9 is arranged in a flared shape, and a plug-in portion 23 is arranged outside the air inlet 10, and the shape of the plug-in portion 23 is adapted to the shape of the flared portion of the airway 5; The port of the airway 5 is arranged in a flared shape, and cooperates with the plug-in portion 23, so that when the bag body 9 and the valve seat core 4 are assembled, the air inlet 10 can quickly connect with the airway 5, and the sealing between the air inlet 10 and the airway 5 can also be improved.

[0028] Reference Figure 1 - Fig.12 Each of the No. 1 protrusions 16 has a liquid storage cavity 24 formed inside, and each of the No. 1 protrusions 16 has a discharge hole 25 formed on its outer surface. The discharge holes 25 are connected to the liquid storage cavity 24 one by one, and the discharge holes 25 are respectively arranged opposite to the No. 1 slots 15; Each of the second protrusions 18 also has a liquid storage cavity 24 formed inside, and each of the second protrusions 18 also has a discharge hole 25 formed on its outer surface. The discharge holes 25 are connected to the liquid storage cavity 24 one by one, and the discharge holes 25 on the second protrusions 18 are respectively arranged opposite to the second slots 17; The liquid storage cavity 24 can contain liquid such as sealant to seal the gap between the flange 2 and the capsule 9, the gap between the valve seat core 4 and the capsule 9, and the gap between the feed end 6 and the capsule 9; After the valve seat core 4 and the capsule 9 are assembled, the air inlet is connected to the airway 5, the No. 1 protrusion 16 is embedded in the No. 1 groove 15, and the No. 2 protrusion 18 is embedded in the No. 2 groove 17. Then the flange 2 is installed, and the flange 2 squeezes the capsule 9 to squeeze the sealant in the liquid outlet cavity 24 out and overflow from the discharge hole 25 to the No. 1 groove 15 and the No. 2 groove 17, so that the gap between the flange 2 and the capsule 9, the gap between the valve seat core 4 and the capsule 9, and the gap between the feed end 6 and the capsule 9 are all sealed to prevent the material in the container from flowing along the gap and affecting the deformation of the capsule 9 and the sealing between the capsule 9 and the valve core 11.

[0029] Reference Figure 1 - Fig.12 Each of the No. 1 slots 15 is provided with an insert 26 adapted to the discharge hole 25, the No. 1 protrusion 16 is embedded in the No. 1 slot 15, and the insert 26 can be inserted into the discharge hole 25 on the No. 1 protrusion 16; Each of the No. 2 slots 17 is also provided with a plurality of inserts 26 adapted to the discharge holes 25 on the No. 2 protrusions 18; the flange 2 is installed at the feed end 6 position, and the end of the insert 26 is placed in the discharge hole 25, and the discharge hole 25 is not completely blocked. When the flange 2 initially squeezes the capsule 9, the sealant in the liquid storage chamber 24 flows out. When the flange 2 is tightened and installed in place again, the insert 26 is completely inserted into the discharge hole 25. The insert 26 completely plugs and seals the discharge hole 25, which not only limits the overflow of the sealant to prevent the sealant overflow from being too large and affecting the bonding and sealing effect, but also the insertion of the insert 26 into the discharge hole 25 can further improve the stability between the capsule 9 and the annular groove 3, as well as the capsule 9 and the valve seat core 4.

[0030] Reference Figure 1 - Figure 4 A ring-shaped limiting ring 27 is provided on the inner side wall of the feed end 6, and the limiting ring 27 is arranged away from the flange 2. A sleeve 28 is provided on the inner end surface of the valve core 11, and a valve stem 14 connected to a spring 29 is provided in the sleeve 28; The limit ring 27 is provided to limit the stroke of the valve core 11 when the valve body 1 is closed, so that the second recess on the valve core 11 can move to a position opposite to the No. 3 protrusion 19, thereby ensuring that the No. 2 recess 22 squeezes the No. 3 protrusion 19; at the same time, the valve stem 14 is connected to the sleeve 28 through the spring 29, and when the valve stem 14 pulls down the valve core 11, it plays a role of buffer protection.

[0031] Working principle: The specific operation process of the air-sealed frictionless pneumatic upward expansion valve in this embodiment is as follows: In the process of opening the valve body 1, the external air pump is turned off and the gas in the capsule 9 is released. The capsule 9 elastically contracts into the annular groove 3, and then drives the cylinder 12. The output end of the cylinder 12 pushes up the valve stem 14. The valve stem 14 drives the valve core 11 to move upward. The valve core 11 is separated from the feed end 6 of the valve body 1. The feed end 6 is opened, and the material in the container enters along the feed end 6 and is discharged from the discharge end of the valve body 1. During the process of closing the valve body 1, the output end of the cylinder 12 pulls down the valve stem 14, and the valve stem 14 drives the valve core 11 to move downward, and the valve core 11 moves and resets to the feed end 6, and blocks the feed end 6. Then, the external air pump is driven, and the gas flows along the pipeline, the gas source interface 8, the channel 7, the airway 5 and the air inlet 10 in sequence, and is finally injected into the capsule 9. The inside of the capsule 9 expands due to the high-pressure gas, and the inner circle of the capsule 9 is squeezed on the surface of the valve core 11. At this time, the valve core 11 realizes the sealing of the feed end 6 through the capsule 9, and can effectively squeeze and seal some materials remaining in the inner circle of the feed end 6; When the valve body 1 is opened again, the capsule 9 shrinks and deforms, and the crystallized and hardened material is more easily separated from the valve core 11 and the capsule 9, so that the subsequent material can smoothly enter the interior of the valve body 1 from the container along the feed end 6.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An air-sealed frictionless pneumatic expansion valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a flange (2) at the feed end (6), an annular groove (3) is provided on the inner ring between the flange (2) and the feed end (6), a valve seat core (4) is provided in the annular groove (3), the valve seat core (4) is arranged close to the inner side of the annular groove (3), and an air channel (5) is provided on one side of the valve seat core (4), the air channel (5) is communicated with a channel (7) provided inside the feed end (6), and the channel (7) is communicated with an air source interface (8) provided on the outer ring of the feed end (6); The inner ring of the valve seat core (4) is provided with a ring-shaped capsule (9), the capsule (9) is arranged in close contact with the inner ring of the valve seat core (4), and the outer ring of the capsule (9) is provided with an air inlet hole (10), the air inlet hole (10) is connected to the air passage (5) on the valve seat core (4), and the inner ring of the capsule (9) is closely attached to the outer ring of the valve core (11) of the valve body (1).

2. The air-sealed frictionless pneumatic expansion valve according to claim 1, characterized in that: The cross section of the sac body (9) is in the shape of two letter "C"s facing each other; the inner ring of the valve seat core (4) is configured to match the shape of the sac body (9).

3. The air-sealed frictionless pneumatic expansion valve according to claim 1, characterized in that: The inner top surface and the inner bottom surface of the annular groove (3) are both provided with a ring-shaped No. 1 clamping groove (15); the upper surface and the lower surface of the capsule (9) are both provided with a ring-shaped No. 1 protrusion (16), and the No. 1 protrusion (16) is embedded in the No. 1 clamping groove (15).

4. The air-sealed frictionless pneumatic expansion valve according to claim 2, characterized in that: The upper and lower surfaces of the inner ring of the valve seat core (4) are provided with a ring-shaped No. 2 groove (17); the inner top and inner bottom of the outer ring of the capsule (9) are provided with a ring-shaped No. 2 protrusion (18), and the No. 2 protrusion (18) can be embedded in the No. 2 groove (17).

5. The air-sealed frictionless pneumatic expansion valve according to claim 4, characterized in that: The inner ring of the capsule (9) is provided with a ring-shaped No. 3 protrusion (19); the outer ring of the valve core (11) is provided with a No. 1 recess (20) adapted to the No. 3 protrusion (19), and the No. 1 recess (20) is arranged in a ring shape.

6. The air-sealed frictionless pneumatic expansion valve according to claim 5, characterized in that: A sealing rod (21) is provided inside the capsule (9), the sealing rod (21) being arranged opposite to the air inlet (10), and one end of the sealing rod (21) being arranged with an enlarged diameter and fixedly connected to the inner surface of the capsule (9), and the other end of the sealing rod (21) being arranged with a reduced diameter and loosely fitted in the air inlet (10); A second recess (22) is also provided on the outer ring of the valve core (11); the second recess (22) is arranged in a ring shape, and the diameter of the second recess (22) is greater than the diameter of the first recess (20).

7. The air-sealed frictionless pneumatic expansion valve according to claim 6, characterized in that: The port of the airway (5) close to the sac (9) is arranged in a flared shape, and a plug-in portion (23) is arranged outside the air inlet hole (10), and the shape of the plug-in portion (23) is adapted to the shape of the flared portion of the airway (5).

8. The air-sealed frictionless pneumatic expansion valve according to claim 3, characterized in that: Each of the No. 1 protrusions (16) has a liquid storage cavity (24) formed inside, and each of the No. 1 protrusions (16) has a discharge hole (25) formed on its outer surface. The discharge holes (25) are connected to the liquid storage cavities (24) one by one, and the discharge holes (25) are respectively arranged opposite to the No. 1 slots (15).

9. The air-sealed frictionless pneumatic expansion valve according to claim 8, characterized in that: An insert piece (26) adapted to the discharge hole (25) is provided in each of the No. 1 slots (15), the No. 1 protrusion (16) is embedded in the No. 1 slots (15), and the insert piece (26) can be inserted into the discharge hole (25) on the No. 1 protrusion (16).

10. The air-sealed frictionless pneumatic expansion valve according to claim 1, characterized in that: A ring-shaped limiting ring (27) is provided on the inner side wall of the feed end (6), and the limiting ring (27) is arranged away from the flange (2). A sleeve (28) is provided on the inner end surface of the valve core (11), and a valve stem (14) connected to a spring (29) is provided inside the sleeve (28).

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