A spacer type dust-proof double-control reversing valve

Abstract

The present invention discloses a spacer-type dust-proof double-control reversing valve, which comprises a valve body and a valve shaft. The valve shaft is movably and telescopically disposed in a first valve cavity of the valve body. The first valve cavity is provided with an air inlet and an air outlet. The axial movement of the valve shaft is driven by a power driving mechanism. A plurality of strong-support composite seals are used for sealing between the valve shaft and the first valve cavity. The plurality of strong-support composite seals seal different valve cavity positions to obtain a reversing channel. In the present invention, strong-support materials are added into a traditional seal ring to form a strong-support composite seal ring, so that the seal ring is not easily deformed and the sealing effect is better. At the same time, when the valve rod moves, the strong-support composite seal ring can also be used to remove dust on the valve rod, having a certain self-cleaning function.

Description

Technical Field

[0001] The present invention belongs to the technical field of dust-proof double-control reversing valves, and relates to a sleeve-type dust-proof double-control reversing valve. Background Art

[0002] Modern aluminum industry production mainly adopts the cryolite-aluminum oxide fused salt electrolysis method. Molten cryolite is the solvent, aluminum oxide is the solute, a carbon body is used as the anode, and aluminum liquid is used as the cathode. After passing a strong direct current, electrochemical reactions occur at the two electrodes in the electrolytic cell. The chemical reaction formula is 2Al2O3 + 3C → 4Al + 3CO2. During the entire electrolytic production process, aluminum oxide is continuously consumed, so it needs to be continuously replenished. In electrolytic aluminum production, the replenishment of aluminum oxide is usually achieved through the operation of an aluminum oxide feeder. When the feeder is opened, aluminum oxide is fed, and when the feeder is closed, the feeding of aluminum oxide stops. The opening and closing of the feeder are realized by the reciprocating motion of a cylinder, and the reciprocating motion of the cylinder is controlled by a reversing valve connected thereto.

[0003] Currently, the installation forms of the alumina feeding reversing solenoid valves in electrolytic production are mainly under-tank installation and above-tank installation. Since under-tank installation will cause too many upper-tank control air pipes, in order to reduce the number of upper-tank control air pipes, reduce the construction difficulty and improve the maintenance space, the reversing valves newly designed in recent years mostly adopt the above-tank installation form. In order to further reduce the number of upper-tank control air pipes, the installation form of the above-tank reversing valve is mainly electrically controlled. As shown in, the sealing ring 2 is sleeved on the valve shaft, and the start and stop are controlled by the electric signal control port 1. However, since electrolytic production is a continuous production process and the frequency of alumina feeding is also a continuous process, when an emergency power outage occurs during electrolytic production, the electrically controlled reversing valve connected to the alumina feeder cannot operate normally, ultimately affecting the normal feeding of alumina and bringing potential safety hazards to electrolytic production. The long-term movement of the valve shaft will cause the sealing ring to wear, resulting in poor sealing effect, and this method also makes it impossible to achieve self-cleaning of the dust on the valve shaft. Figure 7 As shown, the sealing ring 2 is sleeved on the valve shaft, and the start and stop are controlled by the electric signal control port 1. However, since electrolytic production is a continuous production process and the frequency of alumina feeding is also a continuous process, when an emergency power outage occurs during electrolytic production, the electrically controlled reversing valve connected to the alumina feeder cannot operate normally, ultimately affecting the normal feeding of alumina and bringing potential safety hazards to electrolytic production. The long-term movement of the valve shaft will cause the sealing ring to wear, resulting in poor sealing effect, and this method also makes it impossible to achieve self-cleaning of the dust on the valve shaft.

[0004] In addition, since the electrolytic aluminum production environment is a high-temperature, strong magnetic field, and multi-dust environment, in order to ensure the normal operation of the reversing valve, the reversing valve also needs to be able to adapt to the high-temperature, strong magnetic field, and multi-dust environment. Although the currently used reversing valves meet the requirements of adapting to high-temperature and strong magnetic field environments, their adaptability to the multi-dust environment is still insufficient. The phenomenon of high failure rate of the reversing valve due to dust entering the reversing valve frequently occurs. Therefore, it needs to be frequently disassembled for maintenance. However, the above-tank has high-temperature, high-magnetic field, and high-altitude operation conditions, which bring many disadvantages to the maintenance workers and greatly increase the labor intensity of the workers. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a spacer-type dust-proof double-control reversing valve to solve the problems existing in the prior art.

[0006] The technical solution adopted by the present invention is: a spacer-type dust-proof double-control reversing valve, which includes a valve body and a valve shaft. The valve shaft is movably and telescopically placed in the first valve cavity of the valve body. The first valve cavity is provided with an air inlet and an air outlet. The axial movement of the valve shaft is driven by a power driving mechanism. A plurality of strong-support composite sealing rings are used to seal between the valve shaft and the first valve cavity, and different valve cavity positions are sealed by the plurality of strong-support composite sealing rings to obtain a reversing channel.

[0007] Further, the above-mentioned power driving mechanism includes a pilot valve. The pilot valve includes a conical valve port arranged in the second valve cavity and a cylindrical sealing plug arranged opposite to the conical valve port. The conical valve port is communicated with one end of the valve cavity and the P port of the reversing valve. The second valve cavity is communicated with the other end of the valve cavity. At this end of the valve shaft, a driving piston for sealing this valve cavity section is fixedly connected. The cylindrical sealing plug is hermetically placed in the inner cavity at one end of the sleeve iron core, and a preloading spring I abuts against the inner end. The other end of the preloading spring I abuts against the large end of the T-shaped push rod. The small end of the T-shaped push rod is sleeved with a preloading spring II, and both ends of the preloading spring II abut against the large end of the T-shaped push rod and the large end of the T-shaped sealing plug respectively. The diameter of the inner cavity section of the sleeve iron core sealed by the large end of the T-shaped sealing plug is smaller than the diameter of the inner cavity section of the sleeve iron core sealed by the cylindrical sealing plug. One end of the sleeve iron core is fixedly connected to the center of the inner cavity of the coil holder in a sealed manner, and the other end is hermetically embedded in the second valve cavity of the pilot valve. The center of the inner cavity of the coil holder is butted and blocked with a section of the vertical section of the T-shaped pipe fixedly connected to the T-shaped sealing plug. The T-shaped sealing plug can block the inner end of the vertical section of the T-shaped pipe. The coil holder is wound with an electromagnetic coil. The coil holder is fixedly connected in the housing. The T-shaped pipe extends out of the housing. The housing is fixedly connected to one side of the pilot valve; the second valve cavity is L-shaped. A stepped shaft that moves telescopically is arranged perpendicular to the other cavity section of the cylindrical sealing plug, and the large end of the stepped shaft is elastically sealed with the second valve cavity. A conical part is arranged at the small end of the stepped shaft, and the conical surface of the conical part can abut against the end of the sleeve iron core, and the stepped shaft can drive the sleeve iron core to withdraw and open the conical valve port after moving. The large end of the stepped shaft extends out of the second valve cavity and abuts against the piston. The piston is elastically sealed in the piston cavity, and the piston cavity is communicated with the pneumatic control port on the side opposite to the stepped shaft.

[0008] Further, an anti-loosening end cover is connected to the end of the sleeve iron core where the cylindrical sealing plug is installed through a threaded part, and the inner hole diameter of the anti-loosening end cover is smaller than the outer diameter of the cylindrical sealing plug.

[0009] Further, the outer diameter of the anti-loosening end cover is larger than the outer diameter of the sleeve iron core at the connection of the anti-loosening end cover. The small end of a conical spring I abuts against the anti-loosening end cover, and the large end of the conical spring I abuts against the end of the guide cylinder fixedly and sealingly connected to the port of the second valve cavity. The guide cylinder is embedded between the sleeve iron core and the coil holder and is fixedly connected to the coil holder.

[0010] Further, the piston is T-shaped, with its small end abutted against the stepped shaft. A second conical spring is sleeved on the small end, with its small end abutted against the large end of the piston and its large end abutted against the outer side wall of the second valve cavity.

[0011] Further, the strong support composite seal ring includes a metal inner ring and an outer elastic rubber layer wrapped around the metal inner ring. The strong support composite seal ring seals by extruding the large stepped cylindrical surface of the stepped valve shaft.

[0012] Further, breathing holes are provided between the first valve cavity of the reversing valve, the valve shaft and the driving piston in this valve cavity section, and the breathing holes are connected to the O port of the reversing valve through channels.

[0013] Beneficial effects of the present invention: Compared with the prior art, the present invention adds a strong support material to the traditional seal ring to form a strong support composite seal ring, making the seal ring not easily deformed and having a better sealing effect. At the same time, when the valve stem moves, the strong support composite seal ring can also be used to remove dust on the valve stem, having a certain self-cleaning function. The piston breathing holes are built-in, isolating the external environment from the valve cavity, and environmental dust cannot enter the valve body, effectively reducing the influence of dust and other impurities on the valve, and effectively solving the technical problem in the prior art that the electrolysis production environment is dusty and when the reversing valve is exposed to a dusty environment for a long time, it is extremely easy to be blocked by dust, resulting in the reversing valve being unable to work normally. Description of the Drawings

[0014] Figure 1 Front view structural schematic diagram of the sleeve-type dust-proof double-control reversing valve;

[0015] Figure 2 Top view partial cross-sectional schematic diagram of the sleeve-type dust-proof double-control reversing valve;

[0016] Figure 3 Electromagnetic action structural state schematic diagram of the sleeve-type dust-proof double-control reversing valve;

[0017] Figure 4 Pneumatic control state schematic diagram of the sleeve-type dust-proof double-control reversing valve;

[0018] Figure 5 For Figure 1 Enlarged structural schematic diagram of part A in

[0019] Figure 6 Structural schematic diagram of the strong support composite seal ring;

[0020] Figure 7 Structural schematic diagram of the existing electric control reversing valve. Detailed Embodiments

[0021] The present invention will be further introduced below in conjunction with the drawings and specific embodiments.

[0022] Embodiment 1: As Figures 1-6 shown, a spacer type dust-proof double-control reversing valve includes a valve body 1 and a valve shaft 2. The valve shaft 2 is movably and telescopically placed in a first valve cavity 3 of the valve body 1. The first valve cavity 3 is provided with an air inlet 4 and an air outlet 5. The axial movement of the valve shaft 2 is driven by a power driving mechanism. A plurality of strong support composite seals 6 are used for sealing between the valve shaft 2 and the first valve cavity 3. The plurality of strong support composite seals 6 seal different valve cavity positions to obtain a reversing channel. The air inlet 4 includes a P port communicating with the first valve cavity, and the air outlet 5 includes an A port and a B port communicating with the first valve cavity. The first valve cavity 2 is also communicated with two O ports.

[0023] Furthermore, the above-mentioned power drive mechanism includes a pilot valve 7. The pilot valve 7 includes a conical valve port 11 arranged in the second valve chamber 9 and a cylindrical seal plug 12 arranged opposite to the conical valve port 11. The conical valve port 11 is communicated with one end of the valve chamber 3 and the P port of the reversing valve. The second valve chamber 9 is communicated with the other end of the valve chamber 3. At this end, the valve shaft 2 is fixedly connected with a driving piston 10 for sealing this valve chamber section. The cylindrical seal plug 12 is hermetically placed in the inner cavity at one end of the sleeve iron core 13, and a first preloading spring 14 abuts against the inner end. The other end of the first preloading spring 14 abuts against the large end of the T-shaped push rod 15. The small end of the T-shaped push rod 15 is sleeved with a second preloading spring 16. The two ends of the second preloading spring respectively abut against the large end of the T-shaped push rod 15 and the large end of the T-shaped seal plug 12. The diameter of the inner cavity section of the sleeve iron core sealed by the large end of the T-shaped seal plug 12 is smaller than the diameter of the inner cavity section of the sleeve iron core sealed by the cylindrical seal plug 12. One end of the sleeve iron core 13 is hermetically and fixedly connected to the center of the inner cavity of the coil holder 17, and the other end is hermetically embedded in the second valve chamber 9 of the pilot valve 7. The center of the inner cavity of the coil holder 17 is butted and blocked with a vertical section of a T-shaped pipe 19 fixedly connected to a section of the T-shaped seal plug 12. The T-shaped seal plug 12 can block the inner end of the vertical section of the T-shaped pipe 19. The coil holder 17 is wound with an electromagnetic coil 20. The coil holder 17 is fixedly connected in the housing 18. The T-shaped pipe 19 extends out of the housing. The arrangement of the T-shaped pipe, as a standby pneumatic control port, can push the sleeve iron core to close the conical valve port after passing gas. The housing 18 is fixedly connected to one side of the pilot valve 7. The second valve chamber 9 is L-shaped. A movable and telescopic stepped shaft 8 is arranged perpendicular to the other chamber section of the cylindrical seal plug 12, and the large end of the stepped shaft 8 is elastically sealed with the second valve chamber 9. A conical part 21 is arranged at the small end of the stepped shaft 8. The conical surface of the conical part 21 can abut against the end of the sleeve iron core 13, and after the stepped shaft moves, it can drive the sleeve iron core 13 to withdraw and open the conical valve port 11. The large end of the stepped shaft 8 extends out of the second valve chamber 9 and abuts against the piston 22. The piston 22 is elastically sealed in the piston chamber 23. The piston chamber 23 is communicated with the pneumatic control port 24 on the side opposite to the stepped shaft 8. The present invention uses a pneumatic-electric dual-control reversing valve to replace the traditional control reversing valve, enabling the reversing valve for the electrolytic cell to adapt to different working conditions (with or without power electricity). Such a reversing valve is provided with a pneumatic control port 24 and an electric signal control port 31 (for controlling the on-off of the electromagnetic coil). When there is power electricity during normal electrolysis production, the reversing of the reversing valve is controlled by the electric signal control port. When an emergency power outage occurs, in order not to affect normal feeding and ensure the safety of production, the reversing of the reversing valve is controlled by the pneumatic control port.

[0024] To prevent the cylindrical seal plug from detaching from the sleeve iron core 13, the end of the sleeve iron core 13 where the cylindrical seal plug 12 is installed is connected with an anti-detachment end cap 25 through a threaded part. The inner hole diameter of the anti-detachment end cap 25 is smaller than the outer diameter of the cylindrical seal plug 12. The structure of the anti-detachment end cap plays an anti-detachment role, is convenient to manufacture, and facilitates the installation of the internal T-shaped push rod and the first preloading spring.

[0025] In order to automatically close the conical valve port 11, the outer diameter of the anti-disengagement end cover 25 is greater than the outer diameter of the sleeve iron core 13 at the connection of the anti-disengagement end cover 25. The anti-disengagement end cover 25 abuts against the small end of the first conical spring 26, and the large end of the first conical spring 26 abuts against the end of the guide cylinder 27 fixedly and sealingly connected to the port of the second valve cavity 9. The guide cylinder 27 is embedded between the sleeve iron core 13 and the coil holder 17 and is fixedly connected to the coil holder 17. The first conical spring can ensure that the cylindrical sealing plug of the sleeve iron core closes the conical valve port 11 without external force, and opens the conical valve port 11 under the electromagnetic action of the coil. The conical spring structure has stable and reliable closing, and relatively uniform supporting force.

[0026] In order to ensure the piston reset, the above-mentioned piston 22 is T-shaped, the small end abuts against the stepped shaft 8, the small end is sleeved with the second conical spring 28, the small end of the second conical spring 28 abuts against the large end of the piston 22, and the large end of the second conical spring 28 abuts against the outer wall of the second valve cavity 9. The second conical spring can ensure the automatic reset of the piston. The conical structure has stable and reliable reset, and relatively uniform supporting force.

[0027] Commutation working principle: The internal commutation of the commutation valve adopts the conventional commutation principle. (1) Pneumatic control: When the coil is not energized, the conical valve port is closed. The pneumatic control port is connected to the pressure gas, which pushes the piston. When the pressure on the right side of the piston is greater than the pressure on the valve shaft to the right, the piston moves to the left, pushing the stepped shaft to move (as shown in Figure 1 shown, moving to the left), and then pushing the sleeve iron core to compress. The end of the sleeve iron core abutting against the cylindrical sealing plug of the conical valve port will move away from the conical valve port following the sleeve iron core, thereby opening the conical valve port. At this time, the gas at the intake port P enters the second valve cavity of the pilot valve, and then pushes the valve shaft of the commutation valve to move under the push of the piston to reach the set position and stop; the commutation of the commutation valve is completed (the P port and the A port are connected, and the B port is connected to the right O port); (2) Electromagnetic control: When the coil is energized, under the action of the electromagnetic field, the sleeve iron core moves away from the side of the conical valve port, thereby opening the conical valve port. At this time, the gas at the intake port P enters the second valve cavity of the pilot valve, and then pushes the valve shaft of the commutation valve to move under the push of the piston to reach the set position and stop; the commutation of the commutation valve is completed (the P port and the A port are connected, and the B port is connected to the right O port). When the valve shaft is in the middle position, the P port is blocked. When the valve shaft is in the right position, the P port and the B port are connected, and the A port is connected to the left O port.

[0028] Furthermore, the above-mentioned strong-support composite sealing ring 6 includes a metal inner ring 601 and an outer elastic rubber layer 602 wrapped around the metal inner ring 601. The strong-support composite sealing ring 6 squeezes the large-step cylindrical surface of the stepped valve shaft 2 for sealing. Such a strong-support composite sealing ring can improve the sealing stability and thus extend the service life. When under excessive pressure and squeezed from both sides, the deformation at the sealing part is relatively small, and it can maintain the original position for sealing (while only using elastic sealing may lead to the situation where it cannot return to its original position after being squeezed and deformed under the clamping action, thus deteriorating the sealing effect).

[0029] In addition, to ensure the normal operation of the directional control valve, breathing holes 29 are provided between the valve chamber 1 of the directional control valve, the valve shaft 2, and the driving piston 10 in this valve chamber section. The breathing holes 29 are connected to the O port of the directional control valve through a channel 30. In traditional directional control valves, the breathing holes are externally placed. Since the electrolysis production environment is dusty, when the directional control valve is exposed to a dusty environment for a long time, it is extremely easy to be blocked by dust, resulting in the inability of the directional control valve to work properly. In the present invention, the main valve sealing ring of the traditional directional control valve is changed to a sleeve-type composite sealing ring, which can effectively reduce the influence of dust and other impurities on the valve; through structural changes, the breathing holes are internally connected, so that there are no piston breathing holes on the control valve body that communicate with the outside world, preventing dust in the working environment from entering the valve body, and fundamentally protecting the normal operation of the directional control valve.

[0030] The directional control valve of the present invention is connected to the alumina feeding cylinder. By means of an electric signal or a pneumatic signal, the directional control valve is pushed to change its direction, and finally the alumina feeding control is realized; the directional control valve is connected to the fluoride feeding cylinder. By means of an electric signal or a pneumatic signal, the directional control valve is pushed to change its direction, and finally the fluoride feeding control is realized. The directional control valve is connected to the crust-breaking cylinder. By means of an electric signal or a pneumatic signal, the directional control valve is pushed to change its direction, and finally the crust-breaking control is realized.

[0031] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A spacer-type dust-proof double-control reversing valve, characterized in that: It includes a valve body (1) and a valve shaft (2). The valve shaft (2) is movably telescoped in a first valve cavity (3) of the valve body (1). The first valve cavity (3) is provided with an air inlet (4) and an air outlet (5). The axial movement of the valve shaft (2) is driven by a power driving mechanism. A plurality of strong support composite seals (6) are used to seal between the valve shaft (2) and the first valve cavity (3). The plurality of strong support composite seals (6) seal different positions of the valve cavity to obtain a commutation channel. The power driving mechanism includes a pilot valve (7). The pilot valve (7) includes a conical valve port (11) arranged in a second valve cavity (9) and a cylindrical seal plug (12) arranged opposite to the conical valve port (11). The conical valve port (11) is communicated with one end of the first valve cavity (3) and the P port of the reversing valve. The second valve cavity (9) is communicated with the other end of the first valve cavity (3). A driving piston (10) for sealing this valve cavity section is fixedly connected to the valve shaft (2) at the other end of the first valve cavity (3). The cylindrical seal plug (12) is hermetically placed in the inner cavity at one end of the sleeve iron core (13), and a preloading spring I (14) abuts against the inner end. The other end of the preloading spring I (14) abuts against the large end of the T-shaped push rod (15). The small end of the T-shaped push rod (15) is sleeved with a preloading spring II (16). Both ends of the preloading spring II (16) respectively abut against the large end of the T-shaped push rod (15) and the large end of the T-shaped seal plug. The diameter of the inner cavity section of the sleeve iron core sealed by the large end of the T-shaped seal plug is smaller than the diameter of the inner cavity section of the sleeve iron core sealed by the cylindrical seal plug (12). One end of the sleeve iron core (13) is fixedly connected to the center of the inner cavity of the coil holder (17) in a sealed manner, and the other end is hermetically embedded in the second valve cavity (9) of the pilot valve (7). A vertical section of a T-shaped pipe (19) fixedly connected to a section of the T-shaped seal plug that seals and blocks the center of the inner cavity of the coil holder (17) is butted and blocked. The T-shaped seal plug can block the inner end of the vertical section of the T-shaped pipe (19). The coil holder (17) is wound with an electromagnetic coil (20). The coil holder (17) is fixedly connected in the housing (18). The T-shaped pipe (19) extends out of the housing. The housing (18) is fixedly connected to one side of the pilot valve (7). The second valve cavity (9) is L-shaped. A stepped shaft (8) that moves telescopically is arranged in another cavity section perpendicular to the cylindrical seal plug (12), and the large end of the stepped shaft (8) is elastically sealed with the second valve cavity (9). A conical part (21) is arranged at the small end of the stepped shaft (8). The conical surface of the conical part (21) can abut against the end of the sleeve iron core (13), and after the stepped shaft moves, it can drive the sleeve iron core (13) to withdraw and open the conical valve port (11). The large end of the stepped shaft (8) abuts against the piston (22) after extending out of the second valve cavity (9). The piston (22) is elastically sealed in the piston cavity (23). The piston cavity (23) is communicated with an air control port (24) on the side opposite to the stepped shaft (8). An anti-loosening end cap (25) is connected to the end of the sleeve iron core (13) where the cylindrical seal plug (12) is installed through a threaded part. The inner hole diameter of the anti-loosening end cap (25) is smaller than the outer diameter of the cylindrical seal plug (12). The outer diameter of the anti-loosening end cap (25) is larger than the outer diameter of the sleeve iron core (13) where the anti-loosening end cap (25) is connected. The anti-loosening end cap (25) abuts against the small end of the first conical spring (26), and the large end of the first conical spring (26) abuts against the end of the guide cylinder (27) fixedly and sealingly connected to the port of the second valve cavity (9). The guide cylinder (27) is embedded between the sleeve iron core (13) and the coil holder (17) and is fixedly connected to the coil holder (17).

2. The dust-proof double-control reversing valve of the spacer sleeve type according to claim 1, wherein: The piston (22) is T-shaped, with its small end abutting against the stepped shaft (8). A second conical spring (28) is sleeved on the small end. The small end of the second conical spring (28) abuts against the large end of the piston (22), and the large end of the second conical spring (28) abuts against the outer wall of the second valve cavity (9).

3. The dust-proof double-control reversing valve with a spacer sleeve according to claim 1, characterized in that: The strong support composite sealing ring (6) includes a metal inner ring (601) and an external elastic rubber layer (602) wrapped around the metal inner ring (601). The strong support composite sealing ring (6) seals by extruding the large stepped cylindrical surface of the stepped valve shaft (2).

4. A sleeve-type dust-proof double-control reversing valve according to claim 1, characterized in that: Breather holes (29) are provided between the first valve cavity (3) of the reversing valve, the valve shaft (2), and the driving piston (10) in this valve cavity section. The breather holes (29) communicate with the O port of the reversing valve through a channel (30).

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