A valve structure and a powder-air flow mixer

Abstract

The present invention discloses a valve structure, which relates to the field of air flow mixers and includes: a valve seat, on which a valve passage is provided; a valve core, which is used to open and close the valve passage, and an accommodation space is arranged inside the valve core; and a support rod, one end of the support rod is arranged on the valve seat, and the other end of the support rod penetrates through the bottom of the valve core and extends into the accommodation space; the support rod includes a support head, and the support head divides the accommodation space into a first cavity and a second cavity that are not communicated with each other. The present invention also discloses a powder air flow mixer. This valve structure has good stability during the working process, and after applying this valve structure, the stability of the powder air flow mixer is effectively improved during the processes of air flow mixing and discharging.

Description

Technical Field

[0001] The present invention relates to the field of air flow mixers, and particularly to a valve structure and a powder air flow mixer. Background Art

[0002] In the field of powder mixing, when multiple powders need to be mixed, an air flow mixer is required to achieve the purpose of uniform mixing of the multiple powders. The working principle of the air flow mixer is specifically that compressed air is ejected through a compressed air ejection mechanism arranged at the bottom. Taking the compressed air as kinetic energy, after the compressed air enters the mixing chamber, the pressure is quickly released, thereby driving the powder to tumble, so as to achieve the purpose of highly uniform mixing of the powder. Its structure is simple and the mixing efficiency is high. The discharge port of the existing air flow mixer is generally arranged at the bottom, and a valve capable of opening and closing the discharge port is arranged at the discharge port. However, the valve arranged at the discharge port of the existing air flow mixer has poor stability during the working process. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a valve structure, which has good stability during the working process.

[0004] The present invention is implemented by adopting the following technical solutions:

[0005] A valve structure, comprising: a valve seat, on which a valve passage is arranged; a valve core, which is used to open and close the valve passage, and an accommodation space is arranged inside the valve core; and a support rod, one end of the support rod is arranged on the valve seat, and the other end of the support rod penetrates the bottom of the valve core and extends into the accommodation space; the support rod includes a support head, and the support head divides the accommodation space into a first cavity and a second cavity that are not communicated with each other; a first air passage and a second air passage are arranged on the support rod, both the first air passage and the second air passage penetrate the support rod, the first air passage is communicated with the first cavity, and the second air passage is communicated with the second cavity; when it is necessary to open the valve passage, external gas enters the first cavity through the first air passage, thereby pushing the valve core to move away from the valve seat to open the valve passage, and the air in the second cavity is discharged through the second air passage; when it is necessary to close the valve passage, external gas enters the second cavity through the second air passage, thereby pushing the valve core to move towards the valve seat to close the valve passage, and the air in the first cavity is discharged through the first air passage.

[0006] Preferably, the valve core includes a valve core body, an inner jacket, and a valve core bottom cover. The inner jacket is disposed inside the accommodation space and is in close contact with the inner wall of the accommodation space. The accommodation space penetrates through the valve core body. The valve core bottom cover can block the accommodation space. The support rod penetrates through the valve core bottom cover and extends into the accommodation space.

[0007] Preferably, a protrusion is provided on the side of the upper inner wall of the inner jacket. After the valve core closes the valve passage, the top of the support head abuts against the protrusion.

[0008] Preferably, a groove is provided on one side of the valve core bottom cover close to the accommodation space. After the valve core opens the valve passage, the bottom of the support head abuts against the valve core bottom cover.

[0009] Preferably, an installation space for fixing the valve core bottom cover is provided at the bottom of the valve core. The transverse length of the installation space is greater than the transverse length of the accommodation space. The valve core bottom cover includes a cover body and a cap. The cover body is connected to the cap. The cover body extends into the accommodation space, and the cap is disposed in the installation space.

[0010] Preferably, the valve core further includes a valve core bottom gasket. The valve core bottom gasket is disposed at the bottom of the valve core and can seal the valve core bottom cover. The support rod penetrates through the valve core bottom gasket.

[0011] Preferably, a corrugated seal tube is sleeved on the support rod. The corrugated seal tube can seal the gap between the support rod and the valve core bottom gasket and the gap between the valve core bottom gasket and the valve core bottom cover.

[0012] Preferably, a sealing ring is sleeved on the valve core. When the valve core closes the valve passage, the sealing ring can seal the gap between the valve core and the valve seat.

[0013] Preferably, the diameter of the outer edge of the sealing ring is gradually reduced from top to bottom. An annular groove with a diameter gradually reduced from top to bottom is provided on the valve passage. The annular groove is matched with the sealing ring.

[0014] Another object of the present invention is to provide a powder-air mixer.

[0015] A powder-air mixer includes a bin body, a compressed air injection mechanism, and a valve structure as described above. The compressed air injection mechanism can inject gas into the bin body. The bin body is provided with a discharge port. The valve structure is disposed on the discharge port and can open and close the discharge port.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: The valve structure of the present invention is provided with a support rod. The accommodation space of the valve core is divided into a first cavity and a second cavity that are not connected to each other by the support head. The support rod is provided with a first air passage and a second air passage. The first air passage is connected to the first cavity, and the second air passage is connected to the second cavity. When it is necessary to open the valve passage, external gas enters the first cavity through the first air passage, thereby pushing the valve core to move away from the valve seat to open the valve passage. At the same time, the air in the second cavity will be discharged through the second gas passage. When it is necessary to close the valve passage, external gas enters the second cavity through the second air passage, thereby pushing the valve core to move towards the valve seat to close the valve passage. At the same time, the air in the first cavity will be discharged through the first gas passage. Under the combined action of the above structure, in the process of opening and closing the valve passage of the valve structure of the present invention, external gas pushes the valve core to move. At the same time, the air in the first cavity or the second cavity will be discharged through the corresponding air passage to reduce the resistance of the valve core movement. Therefore, the valve structure of the present invention has good working stability. The powder-air mixer of the present invention is provided with a valve structure, so that the stability of the powder-air mixer in the processes of air mixing and discharging is effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the valve structure in an embodiment of the present invention.

[0018] Figure 2 It is a partial schematic diagram of the valve structure in an embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of opening the valve passage in an embodiment of the present invention.

[0020] Figure 4 is Figure 1 an enlarged view of A in

[0021] Figure 5 is Figure 1 an enlarged view of B in

[0022] Figure 6 It is a partial schematic diagram of the valve core in an embodiment of the present invention.

[0023] Figure 7 It is a schematic diagram of the powder-air mixer in an embodiment of the present invention.

[0024] Reference numerals: 1, spool; 2, valve seat; 3, support rod; 4, valve passage; 5, accommodation space; 6, support head; 7, support rod body; 8, first cavity; 9, second cavity; 10, first air passage; 11, second air passage; 12, spool body; 13, inner jacket; 14, spool bottom cover; 15, jacket body; 16, jacket mounting cap; 17, protrusion; 18, groove; 19, installation space; 20, cover body; 21, cap; 22, spool bottom gasket; 23, corrugated seal tube; 24, sealing ring; 25, annular groove; 26, bin body; 27, compressed air injection mechanism; 28, compressed air nozzle. Detailed implementation mode

[0025] The following combines Figures 1-7 to elaborate more detailedly on the technical solution provided by the invention.

[0026] As Figures 1-7 shown, an embodiment of the present invention provides a valve structure, which includes a spool 1, a valve seat 2 and a support rod 3. A valve passage 4 is provided on the valve seat 2. The spool 1 is used to open and close the valve passage 4. An accommodation space 5 is provided inside the spool 1. One end of the support rod 3 is provided on the valve seat 2, and the other end of the support rod 3 penetrates the bottom of the spool 1 and extends into the accommodation space 5. This valve structure has good stability during the process of opening and closing the valve passage 4.

[0027] The support rod 3 includes a support head 6 and a support rod body 7. The support head 6 is connected to the support rod body 7. The support head 6 is provided at the top of the support rod body 7. The support head 6 divides the accommodation space 5 into a first cavity 8 and a second cavity 9. The first cavity 8 and the second cavity 9 are not communicated with each other under the partitioning action of the support head 6. The second cavity 9 surrounds the support rod body 7. The support rod 3 is provided with a first air passage 10 and a second air passage 11. Both the first air passage 10 and the second air passage 11 penetrate the support rod 3. The first air passage 10 is communicated with the first cavity 8, and the second air passage 11 is communicated with the second cavity 9. When gas is introduced into the first air passage 10, gas is discharged from the second air passage 11; when gas is introduced into the second air passage 11, gas is discharged from the first air passage 10. When it is necessary to open the valve passage 4, external gas enters the first cavity 8 through the first air passage 10 to push the spool 1 to move away from the valve seat 2 to open the valve passage 4, and the air in the second cavity 9 is discharged through the second air passage 11; when it is necessary to close the valve passage 4, external gas enters the second cavity 9 through the second air passage 11 to push the spool 1 to move towards the valve seat 2 to close the valve passage 4, and the air in the first cavity 8 is discharged through the first air passage 10. The valve structure of this embodiment has good stability during the process of opening and closing the valve passage 4.

[0028] The valve core 1 includes a valve core body 12, an inner jacket 13 and a valve core bottom cover 14. The inner jacket 13 is arranged inside the accommodation space 5. The inner jacket 13 includes a jacket body 15. A jacket mounting cap 16 is arranged on the jacket body 15. The transverse length of the jacket mounting cap 16 is greater than the transverse length of the jacket body 15. The jacket mounting cap 16 is connected to the outer edge of the accommodation space 5. The inner jacket 13 is in close contact with the inner wall of the accommodation space 5, specifically, the jacket body 15 is in close contact with the inner wall of the accommodation space 5. The accommodation space 5 penetrates through the valve core body 12. The valve core bottom cover 14 can block the accommodation space 5. The support rod 3 penetrates through the valve core bottom cover 14 and extends into the accommodation space 5. Since there will be certain errors in the process of manufacturing parts, these errors will cause the parts to be misaligned during later assembly or there will be large gaps between the parts after assembly, thus affecting the normal operation between the parts. When the support head 6 and the accommodation space 5 cannot be fully matched, it is necessary to remanufacture the support rod 3 or the valve core 1, which is costly. However, in this embodiment, by providing the inner jacket 13, it only needs to match the inner jacket 13 with the support head 6 and the valve core 1 respectively. When there is a mismatch, only the inner jacket 13 needs to be remanufactured, greatly reducing the manufacturing cost. In addition, by providing the jacket mounting cap 16, the jacket mounting cap 16 can improve the installation structural stability of the inner jacket 13.

[0029] A protrusion 17 is arranged on the side of the inner wall above the inner jacket 13. After the valve core 1 closes the valve passage 4, the top of the support head 6 abuts against the protrusion 17, so that there is still a certain space in the first cavity 8 at the top of the support head 6. When the valve core 1 needs to open the valve passage 4, the gas in the first air passage 10 can first enter the space in the first cavity 8 at the top of the support head 6. The gas in the space of the first cavity 8 gradually increases and generates a thrust on the valve core 1, so as to more effectively push the valve core 1 to move. In addition, after the valve core 1 closes the valve passage 4, it can prevent the top of the support head 6 from directly colliding with the inner jacket 13, reduce the occurrence of damage to the inner jacket 13, and improve the durability.

[0030] A groove 18 is arranged on one side of the valve core bottom cover 14 close to the accommodation space 5. After the valve core 1 opens the valve passage 4, the bottom of the support head 6 abuts against the valve core bottom cover 14, so that there is still a certain space in the second cavity 9 at the bottom of the support head 6. When the valve core 1 needs to close the valve passage 4, the gas in the second air passage 11 can first enter the space in the second cavity 9 at the bottom of the support head 6. The gas in the space of the second cavity 9 gradually increases and generates a thrust on the valve core bottom cover 14, so as to more effectively drive the valve core 1 to move.

[0031] There is an installation space 19 at the bottom of the valve core 1 capable of fixing the valve core bottom cover 14. The transverse length of the installation space 19 is greater than the transverse length of the accommodation space 5. The valve core bottom cover 14 includes a cover body 20 and a cap 21. The cover body 20 is connected to the cap 21. The cover body 20 extends into the accommodation space 5, and the cap 21 is arranged in the installation space 19. Since the valve core bottom cover 14 is used to block the accommodation space 5, in order to ensure the working operation of the valve structure, there are relatively high requirements for the sealing performance between the valve core bottom cover 14 and the accommodation space 5. In this embodiment, by installing the cap 21 of the valve core bottom cover 14 in the installation space 19, and the transverse length of the installation space 19 is greater than the transverse length of the accommodation space 5. Therefore, the gap between the cover body 20 and the accommodation space 5 forms the first sealing channel, the gap between the surface of the cap 21 close to the accommodation space 5 and the installation space 19 forms the second sealing channel, and the gap between the side surface of the cap 21 and the installation space 19 forms the third sealing channel. For the gas in the accommodation space 5 to cause leakage, it needs to pass through the first sealing channel, the second sealing channel, and the third sealing channel in sequence. The above design greatly improves the sealing effect of the valve structure, thereby making the valve structure more stable during the working process.

[0032] The valve core 1 further includes a valve core bottom gasket 22. The valve core bottom gasket 22 is arranged at the bottom of the valve core 1. The transverse length of the valve core bottom gasket 22 is greater than the transverse length of the valve core bottom cover 14. The valve core bottom gasket 22 can seal the valve core bottom cover 14, and the support rod 3 penetrates through the valve core bottom gasket 22. By providing the valve core bottom gasket 22, the number of layers of the sealing channel is increased, making the structure of the sealing channel more complex, thereby further improving the sealing effect of the valve structure.

[0033] A corrugated sealing tube 23 is sleeved on the support rod 3. The corrugated sealing tube 23 can seal the gap between the support rod 3 and the valve core bottom gasket 22 and the gap between the valve core bottom gasket 22 and the valve core bottom cover 14. By providing the corrugated sealing tube 23 to seal the gap between the support rod 3 and the valve core bottom gasket 22 and the gap between the valve core bottom gasket 22 and the valve core bottom cover 14, it is possible to prevent the gas in the accommodation space 5 from leaking through the gap between the support rod 3 and the valve core bottom gasket 22 and the gap between the valve core bottom gasket 22 and the valve core bottom cover 14, greatly improving the sealing effect of the valve structure, thereby making the valve structure more stable during the working process.

[0034] A sealing ring 24 is sleeved on the valve core 1. When the valve core 1 closes the valve channel 4, the sealing ring 24 can seal the gap between the valve core 1 and the valve seat 2. By providing the sealing ring 24, when the valve core 1 closes the valve channel 4, the cooperation between the valve core 1 and the valve seat 2 is reliable. After the valve structure is applied to the equipment, the valve core 1 is not easily loosened during the working process of the equipment, thereby reducing the occurrence of leakage problems. The sealing ring 24 is an annular sealing ring 24, which can not only achieve sealing but also assist in providing lateral support to enhance the stiffness of the overall structure.

[0035] The diameter of the outer edge of the sealing ring 24 is gradually reduced from top to bottom. A ring groove 25 with a diameter gradually reduced from top to bottom is provided on the valve passage 4, and the ring groove 25 is matched with the sealing ring 24. During the manufacturing process of parts, there will be certain errors. Such errors may cause the valve core 1 and the valve seat 2 to be misaligned during later assembly or there will be a large gap between the valve core 1 and the valve seat 2 after assembly, thus affecting the normal use of the valve structure. In this embodiment, the diameter of the outer edge of the sealing ring 24 is gradually reduced from top to bottom, and a ring groove 25 with a diameter gradually reduced from top to bottom is provided on the valve passage 4. The ring groove 25 is matched with the sealing ring 24. When the valve core 1 needs to close the valve passage 4 after opening the valve passage 4, the bottom of the sealing ring 24 will first enter the top of the ring groove 25. Since the diameter of the bottom of the sealing ring 24 is smaller than the diameter of the top of the ring groove 25, even if there are errors in the parts, the bottom of the sealing ring 24 can easily enter the top of the ring groove 25. After the bottom of the sealing ring 24 enters the top of the ring groove 25, the sealing ring 24 gradually enters the inside of the ring groove 25, and the sealing ring 24 will move along the ring groove 25 until it completely enters the ring groove 25. The ring groove 25 plays a role of positioning. Even if there are errors in the parts, the sealing ring 24 will not shift. In addition, the sealing ring 24 can seal the gap between the valve core 1 and the valve seat 2 caused by dimensional errors during the manufacturing process, thereby improving the sealing effect and making the valve structure more stable during operation.

[0036] The reciprocating motion of the above-mentioned valve core 1 to open and close the valve passage 4 is driven by gas. In addition, hydraulic oil can also be used to replace gas to drive the valve core 1 to reciprocate.

[0037] This embodiment also provides a powder air flow mixer, which includes a bin body 26, a compressed air injection mechanism 27 and the valve structure as described above. The compressed air injection mechanism 27 can inject gas into the bin body 26. An outlet is provided on the bin body 26, and the valve structure is arranged on the outlet, and the valve structure can open and close the outlet. The valve core 1 in this powder air flow mixer is conical. The compressed air injection mechanism 27 includes a plurality of compressed air nozzles 28, and the compressed air nozzles 28 are arranged in an array around the central axis of the valve core 1 at the bottom of the bin body 26.

[0038] Working principle of the powder pneumatic mixer: The valve core 1 closes the valve passage 4, and the powder to be mixed is put into the bin body 26. The compressed air ejector ejects compressed gas. After the compressed air enters the bin body 26, the pressure is quickly released, driving the powder to tumble, so that the powder is mixed with high uniformity. After the powder mixing is completed, the external gas enters the first cavity 8 through the first air passage 10, thereby pushing the valve core 1 to move away from the valve seat 2 to open the valve passage 4. The air in the second cavity 9 is discharged through the second air passage 11. After the discharging is completed, the external gas enters the second cavity 9 through the second air passage 11, thereby pushing the valve core 1 to move towards the valve seat 2 to close the valve passage 4. The air in the first cavity 8 is discharged through the first air passage 10, so as to carry out the next powder mixing work.

[0039] The above-mentioned implementation manners are only the preferred implementation manners of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the protection scope required by the present invention.

Claims

1. A valve structure, characterized in that, including a valve seat, on which a valve passage is provided; a valve core for opening and closing the valve passage, and an accommodation space is arranged inside the valve core; and a support rod, one end of the support rod is arranged on the valve seat, and the other end of the support rod penetrates through the bottom of the valve core and extends into the accommodation space; the support rod includes a support head, and the support head divides the accommodation space into a first cavity and a second cavity that are not communicated with each other; a first air passage and a second air passage are arranged on the support rod, both the first air passage and the second air passage penetrate through the support rod, the first air passage is communicated with the first cavity, and the second air passage is communicated with the second cavity; when it is necessary to open the valve passage, external gas enters the first cavity through the first air passage, thereby pushing the valve core to move away from the valve seat to open the valve passage, and the air in the second cavity is discharged through the second air passage; when it is necessary to close the valve passage, external gas enters the second cavity through the second air passage, thereby pushing the valve core to move towards the valve seat to close the valve passage, and the air in the first cavity is discharged through the first air passage; the valve core includes a valve core body, an inner layer jacket and a valve core bottom cover, the inner layer jacket is arranged inside the accommodation space, the inner layer jacket is in close contact with the inner wall of the accommodation space, the accommodation space penetrates through the valve core body, the valve core bottom cover can block the accommodation space, and the support rod penetrates through the valve core bottom cover and extends into the accommodation space; a sealing ring is sleeved on the valve core, and when the valve core closes the valve passage, the sealing ring can seal the gap between the valve core and the valve seat.

2. The valve structure according to claim 1, characterized in that, a protrusion is arranged on the inner wall side above the inner layer jacket, and after the valve core closes the valve passage, the top of the support head abuts against the protrusion.

3. The valve structure according to claim 1, characterized in that, a groove is arranged on one side of the valve core bottom cover close to the accommodation space, and after the valve core opens the valve passage, the bottom of the support head abuts against the valve core bottom cover.

4. The valve structure according to claim 1, characterized in that, an installation space for fixing the valve core bottom cover is arranged at the bottom of the valve core, the transverse length of the installation space is greater than the transverse length of the accommodation space, the valve core bottom cover includes a cover body and a cap, the cover body is connected with the cap, the cover body extends into the accommodation space, and the cap is arranged in the installation space.

5. The valve structure according to claim 4, wherein the valve core further includes a valve core bottom pad, the valve core bottom pad is arranged at the bottom of the valve core, the valve core bottom pad can seal the valve core bottom cover, and the support rod penetrates through the valve core bottom pad.

6. The valve structure according to claim 5, characterized in that, a corrugated sealing tube is sleeved on the support rod, and the corrugated sealing tube can seal the gap between the support rod and the valve core bottom pad and the gap between the valve core bottom pad and the valve core bottom cover.

7. The valve structure according to claim 1, characterized in that, the diameter of the outer edge of the sealing ring is gradually reduced from top to bottom, and an annular groove with a diameter gradually reduced from top to bottom is arranged on the valve passage, and the annular groove is matched with the sealing ring.

8. A powder air flow mixer, characterized in that, It includes a silo body, a compressed air injection mechanism, and a valve structure as described in any one of claims 1-7. The compressed air injection mechanism is capable of injecting gas into the interior of the silo body. The silo body is provided with a discharge port, and the valve structure is arranged on the discharge port. The valve structure can open and close the discharge port.

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