Switch valve for sodium persulfate production

Abstract

The invention relates to the technical field of switch valves, in particular to a switch valve for sodium persulfate production, which comprises a gas source, a valve body assembly and a sealing assembly, the valve body assembly comprises a valve body, the valve body comprises a hollow cylinder and a connecting rod, and the connecting rod is vertically connected to the outer wall of the hollow cylinder; a transmission channel and an airflow channel are arranged in the connecting rod and penetrate through the outer wall of the hollow cylinder; the sealing assembly comprises a second air source valve and a sealing ring, and the sealing ring is made of an elastic material; a plurality of cavities are formed in the sealing ring and are communicated with the airflow channel; the second air source valve is communicated with the air source, the outside and the airflow channel; by additionally arranging the additional airflow channel, intermittent inflation and deflation can be carried out by utilizing an air source when medium flow is generated in a discharging state, and sodium persulfate crystallized on the surface of the sealing ring is repeatedly extruded and stretched by combining with an elastic material, so that the sodium persulfate is crystallized and broken and then is taken away by a medium flow; and an emergency leaking stoppage effect can also be achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of switch valves, in particular to a switch valve for sodium persulfate production. BACKGROUND

[0002] Sodium persulfate is also called high sodium sulfate. It is white crystalline powder, odorless, and can be dissolved in water, used as bleaching agent, oxidizing agent and emulsion polymerization accelerator.

[0003] Valves are important accessories for controlling medium flow on chemical pipelines, especially for controlling objects in the reaction kettle and preventing leakage while the reaction kettle is working. At present, most of the discharge valve ports of the sodium persulfate production reaction kettle are used for continuous long-time production process. Because of the dead angle of the valve, sodium persulfate crystallizes in the dead angle, which affects the smoothness of the valve and even affects the sealing effect. Therefore, the valve needs to be manually maintained after a certain period of use. However, the operator must be specially trained, strictly follow the operating procedures, and wear a head cover type electrically powered air filter respirator, a polyethylene anti-toxic suit, and rubber gloves. The operator should stay away from fire, heat source, and avoid smoking in the workplace to avoid dust and contact with reducing agents, active metal powder, alkalis and alcohols. Manual maintenance is difficult, has many precautions, and is dangerous and time-consuming. Therefore, a switch valve for sodium persulfate production that can reduce the frequency of manual maintenance is needed. SUMMARY

[0004] The technical problem to be solved by the application is to provide a switch valve for sodium persulfate production that can reduce the frequency of manual maintenance.

[0005] To solve the above technical problems, the technical scheme adopted by the application is as follows: A switch valve for sodium persulfate production, comprising a gas source, a valve body assembly and a sealing assembly. The valve body assembly comprises a first gas source valve, a pneumatic actuator, a valve body, a valve rod and a butterfly plate. The valve body comprises a hollow cylinder and a connecting rod, and the connecting rod is connected perpendicularly to the outer wall of the hollow cylinder. A transmission channel and an airflow channel are arranged in the connecting rod, and both channels pass through the outer wall of the hollow cylinder. The butterfly plate is located in the hollow cylinder, the pneumatic actuator is arranged at the top of the connecting rod, and the valve rod is arranged in the transmission channel to drive the pneumatic actuator and the butterfly plate. The pneumatic actuator is connected to the gas source through the first gas source valve. The sealing assembly comprises a second gas source valve and a sealing ring made of elastic material; the sealing ring is sleeved on the inner wall of the valve body and located between the valve body and the butterfly plate, and is provided with an extension channel corresponding to the transmission channel for the valve rod to pass through; a plurality of cavities are arranged in the sealing ring and are circumferentially distributed, and the cavities are in communication with the airflow channel; the second gas source valve is in communication with the gas source, the outside world and the airflow channel; the second gas source valve is in communication with the gas source for inflation, and is in communication with the outside world for deflation; When the switch valve for sodium persulfate production is in a discharging state, the second gas source valve intermittently inflates and deflates the cavities, and the intermittent inflation causes the sealing ring to deform, so that the crystallized sodium persulfate in the switch valve for sodium persulfate production is separated from the fluid and discharged; if the switch valve for sodium persulfate production is in a closed state and leakage occurs, the second gas source valve is connected to the gas source to inflate the cavities, and then stops inflation after plugging the leakage.

[0006] Preferably, the sealing assembly further comprises a temperature regulator, the second gas source valve is in communication with the airflow channel through the temperature regulator, and the temperature regulator adjusts the gas from the gas source and then enters the cavities.

[0007] Preferably, a temperature sensor is further arranged in the cavities of the sealing ring, the temperature sensor is electrically connected with the temperature regulator through an electric wire, and the electric wire is arranged along the airflow channel.

[0008] Preferably, the temperature sensor obtains the internal temperature of the sealing ring, if the internal temperature is higher than the working temperature range of the sealing ring, the temperature regulator lowers the temperature of the gas from the gas source and then enters the cavities; if the internal temperature is lower than the working temperature range of the sealing ring, the temperature regulator raises the temperature of the gas from the gas source and then enters the cavities.

[0009] Preferably, the sealing ring at the corresponding position of the transmission channel is in interference fit with the valve rod.

[0010] Preferably, the sealing ring is sealingly fixed on the inner wall of the hollow cylinder. When the sealing ring is sealingly fixed, the cavities are aligned and in communication with the airflow channel, and the different cavities are in communication with each other.

[0011] Preferably, the inner wall of the hollow cylinder is polished.

[0012] Preferably, the material of the sealing ring is fluororubber or perfluoroether rubber.

[0013] Preferably, the valve rod and the butterfly plate are made of 316L stainless steel.

[0014] Preferably, the valve rod and the butterfly plate are coated with a polytetrafluoroethylene coating.

[0015] The beneficial effects of the present application are that: by adding an additional air flow channel, intermittent inflation and deflation can be performed when the medium flows at the on-off valve for sodium persulfate production in the discharge state using the air source, combined with the elastic material, so that the crystallized sodium persulfate on the surface of the sealing ring is repeatedly extruded and stretched and then broken into pieces, and then carried away by the medium flow, thereby avoiding the problem of residue or stuck butterfly plate during cleaning at other times; and by inflating the cavity when the closed state occurs and leakage occurs, the function of emergency leak stoppage can be achieved, avoiding pollution of the leakage to the product or causing other dangers; and because the temperature change of the medium in the on-off valve for sodium persulfate production causes thermal expansion and contraction of the components, resulting in sealing failure, therefore, the leakage caused by this reason can also be overcome by achieving leak stoppage after inflation; at the same time, the same air source as the valve body assembly is used, which can simplify the design and be compatible with the existing pneumatic butterfly valve; the air flow channel is arranged in the valve body, reducing the stroke of the exposed pipeline and avoiding damage due to external force acting on the exposed pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a first angle schematic view of an on-off valve for sodium persulfate production according to an embodiment of the present application. Fig. 2 It is a second angle schematic view of an on-off valve for sodium persulfate production according to an embodiment of the present application. Fig. 3 It is a cross-sectional schematic view of an on-off valve for sodium persulfate production according to an embodiment of the present application. Label explanation: 1, valve body assembly; 11, first air source valve; 12, pneumatic actuator; 13, valve body; 131, hollow cylinder; 132, connecting rod; 133, transmission channel; 134, air flow channel; 14, valve stem; 15, butterfly plate; 2, sealing assembly; 21, second air source valve; 22, sealing ring; 23, cavity; 24, temperature regulator. DETAILED DESCRIPTION

[0017] In order to explain the technical content, purposes and effects of the present application in detail, the following will be described in conjunction with the embodiments and the accompanying drawings.

[0018] Please refer to Figs. 1 to 3 An on-off valve for sodium persulfate production, comprising an air source, a valve body assembly 1 and a sealing assembly 2. The valve body assembly 1 comprises a first air source valve 11, a pneumatic actuator 12, a valve body 13, a valve rod 14, and a butterfly plate 15, wherein the valve body 13 comprises a hollow cylinder 131 and a connecting rod 132, the connecting rod 132 is vertically connected to the outer wall of the hollow cylinder 131, the connecting rod 132 is provided with a transmission channel 133 and an airflow channel 134, the transmission channel 133 and the airflow channel 134 both pass through the outer wall of the hollow cylinder 131, the butterfly plate 15 is located in the hollow cylinder 131, the pneumatic actuator 12 is arranged at the top of the connecting rod 132, the valve rod 14 is located in the transmission channel 133 and is in transmission connection with the pneumatic actuator 12 and the butterfly plate 15, and the pneumatic actuator 12 is in communication with the air source through the first air source valve 11. The sealing assembly 2 comprises a second air source valve 21 and a sealing ring 22, the sealing ring 22 is made of elastic material, the sealing ring 22 is sleeved on the inner wall of the valve body 13 and is located between the valve body 13 and the butterfly plate 15, the sealing ring 22 is provided with an extension channel corresponding to the transmission channel 133 for the valve rod 14 to pass through, the sealing ring 22 is provided with a plurality of cavities 23, the cavities 23 are circumferentially distributed, the cavities 23 are in communication with the airflow channel 134, the second air source valve 21 is in communication with the air source, the outside and the airflow channel 134, the second air source valve 21 is in communication with the air source to inflate, and the second air source valve 21 is in communication with the outside to deflate. When the switch valve for sodium persulfate production is in a discharging state, the second air source valve 21 intermittently inflates and deflates the cavities 23, the intermittent inflation causes the sealing ring 22 to deform, so that the crystallized sodium persulfate in the switch valve for sodium persulfate production is separated from the fluid and discharged; if the switch valve for sodium persulfate production is in a closed state and leakage occurs, the second air source valve 21 is connected to the air source to inflate the cavities 23, and then realizes plugging after stopping inflation.

[0019] From the above description, by adding an additional air flow channel 134, the gas source can be used to produce intermittent inflation and deflation when the sodium persulfate production switch valve is in the discharge state. Combined with the elastic material, the crystallized sodium persulfate on the surface of the sealing ring 22 is repeatedly squeezed and stretched, and then the crystalline fragments are carried away by the medium flow, thereby avoiding the problem of residue or jamming of the butterfly plate 15 during cleaning at other times. And when the cavity 23 is inflated due to leakage in the closed state, it can play an emergency leak stoppage role to avoid contamination of the product or cause other dangers. And because the temperature change of the sodium persulfate production switch valve causes the parts to expand and contract, resulting in sealing failure, inflation can also overcome the leakage caused by this reason. At the same time, it uses the same gas source as the valve body assembly 1, which can simplify the design and be compatible with existing pneumatic butterfly valves. The air flow channel 134 is arranged in the valve body 13 to reduce the travel of the exposed pipeline and avoid damage due to external forces.

[0020] Further, the sealing assembly 2 further comprises a temperature regulator 24, and the second gas source valve 21 is in communication with the air flow channel 134 through the temperature regulator 24. The temperature regulator 24 adjusts the gas from the gas source and enters the cavity 23.

[0021] From the above description, by setting the temperature regulator 24, the gas from the gas source can be adjusted to a predetermined temperature, so that the sealing ring 22 always maintains a predetermined working temperature range, ensuring the sealing effect.

[0022] Further, the cavity 23 of the sealing ring 22 further comprises a temperature sensor, and the temperature sensor is electrically connected with the temperature regulator 24 through an electric wire, and the electric wire is arranged along the air flow channel 134.

[0023] From the above description, by setting the temperature sensor, the temperature inside the sealing ring 22 can be accurately obtained, ensuring the temperature regulating effect. The temperature sensor is arranged in the cavity 23, which is convenient to insert, and the electric wire is arranged along the air flow channel 134, making wiring more convenient.

[0024] Further, the temperature sensor obtains the temperature inside the sealing ring 22. If the temperature is higher than the working temperature range of the sealing ring 22, the temperature regulator 24 cools the gas from the gas source and enters the cavity 23. If the temperature is lower than the working temperature range of the sealing ring 22, the temperature regulator 24 warms the gas from the gas source and enters the cavity 23.

[0025] From the above description, by adjusting the temperature of the gas, the working temperature of the sealing ring 22 can always be at an appropriate temperature.

[0026] Further, the sealing ring 22 is in interference fit with the valve stem 14 at the corresponding position.

[0027] As can be seen from the above description, the interference fit can avoid leakage.

[0028] Further, the sealing ring 22 is fixed and sealed on the inner wall of the hollow cylinder 131. When the sealing ring 22 is fixed and sealed, the cavities 23 are aligned and communicated with the airflow channel 134, and the cavities 23 are communicated with each other.

[0029] As can be seen from the above description, the sealing ring 22 is fixed and sealed on the inner wall of the hollow cylinder 131, which can avoid gas leakage at the connection between the cavities 23 and the airflow channel 134.

[0030] Further, the inner wall of the hollow cylinder 131 is polished.

[0031] As can be seen from the above description, the polished inner wall can reduce the gap, make the connection between the sealing ring 22 and the hollow cylinder 131 more tight, and avoid gas leakage.

[0032] Further, the material of the sealing ring 22 is fluororubber or perfluoroether rubber.

[0033] As can be seen from the above description, the fluororubber or perfluoroether rubber can be more corrosion resistant.

[0034] Further, the valve stem 14 and the butterfly plate 15 are made of 316L stainless steel.

[0035] Further, the valve stem 14 and the butterfly plate 15 are coated with a polytetrafluoroethylene coating.

[0036] As can be seen from the above description, the polytetrafluoroethylene coating can reduce friction, avoid wear and tear, shorten the service life of the sealing ring 22, and also be more corrosion resistant. Embodiment one

[0037] A switch valve for sodium persulfate production, comprising an air source, a valve body assembly 1 and a sealing assembly 2. The valve body assembly 1 comprises a first air source valve 11, a pneumatic actuator 12, a valve body 13, a valve rod 14, and a butterfly plate 15, the valve body 13 comprises a hollow cylinder 131 and a connecting rod 132, the connecting rod 132 is vertically connected to the outer wall of the hollow cylinder 131, the connecting rod 132 is provided with a transmission channel 133 and an airflow channel 134, both of which pass through the outer wall of the hollow cylinder 131, the butterfly plate 15 is located in the hollow cylinder 131, the pneumatic actuator 12 is arranged at the top of the connecting rod 132, the valve rod 14 is located in the transmission channel 133 and is in transmission connection with the pneumatic actuator 12 and the butterfly plate 15, and the pneumatic actuator 12 is in communication with the air source through the first air source valve 11. The sealing assembly 2 comprises a second air source valve 21 and a sealing ring 22, the sealing ring 22 is made of elastic material, the sealing ring 22 is sleeved on the inner wall of the valve body 13 and located between the valve body 13 and the butterfly plate 15, the sealing ring 22 is provided with an extension channel corresponding to the transmission channel 133 for the valve rod 14 to pass through, the sealing ring 22 is provided with a plurality of cavities 23, the cavities 23 are circumferentially distributed, and the cavities 23 are in communication with the airflow channel 134, the second air source valve 21 is in communication with the air source, the outside world and the airflow channel 134, the second air source valve 21 is in communication with the air source to inflate, and the second air source valve 21 is in communication with the outside world to deflate. When the on-off valve for sodium persulfate production is in the discharging state, the second air source valve 21 intermittently inflates and deflates the cavities 23, the inflation of the cavities 23 causes the deformation of the sealing ring 22, so that the crystallized sodium persulfate in the on-off valve for sodium persulfate production is separated from the fluid and discharged; if the on-off valve for sodium persulfate production is in the closed state and leakage occurs, the second air source valve 21 is connected to the air source to inflate the cavities 23, and then the cavities 23 stop inflating after the leakage is plugged.

[0038] The transmission channel 133 is in interference fit with the valve rod 14 at the corresponding sealing ring 22.

[0039] The sealing ring 22 is sealingly fixed on the inner wall of the hollow cylinder 131. When the sealing ring 22 is sealingly fixed, the cavities 23 are aligned and in communication with the airflow channel 134, and the different cavities 23 are in communication with each other.

[0040] The inner wall of the hollow cylinder 131 is polished.

[0041] The material of the sealing ring 22 is fluororubber or perfluoroether rubber. Example Two

[0042] An on-off valve for sodium persulfate production, which is the same as example one, the difference lies in that: The sealing assembly 2 further comprises a temperature regulator 24, the second gas source valve 21 is communicated with the gas flow channel 134 through the temperature regulator 24, and the temperature regulator 24 adjusts the gas of the gas source and then enters the cavity 23.

[0043] The cavity 23 of the sealing ring 22 is further provided with a temperature sensor, the temperature sensor is electrically connected with the temperature regulator 24 through an electric wire, and the electric wire is arranged along the gas flow channel 134.

[0044] The temperature sensor obtains the internal temperature of the sealing ring 22, if the internal temperature is higher than the working temperature range of the sealing ring 22, the temperature regulator 24 adjusts the gas of the gas source to be cooled and then enters the cavity 23, and if the internal temperature is lower than the working temperature range of the sealing ring 22, the temperature regulator 24 adjusts the gas of the gas source to be heated and then enters the cavity 23. Embodiment three

[0045] A switch valve for sodium persulfate production, the same as that in embodiment one will not be repeated, and the difference is that: The valve rod 14 and the butterfly plate 15 are made of 316L stainless steel, and the valve rod 14 and the butterfly plate 15 are coated with a polytetrafluoroethylene coating.

[0046] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent transformation, direct or indirect application in the related technical field by using the content of the specification and the drawings of the present application is also included in the patent protection range of the present application.

Claims

1. A switching valve for sodium persulfate production, characterized in that, Includes the air source, valve body assembly, and sealing assembly; The valve body assembly includes a first air source valve, a pneumatic actuator, a valve body, a valve stem, and a butterfly plate. The valve body includes a hollow cylinder and a connecting rod, with the connecting rod vertically connected to the outer wall of the hollow cylinder. The connecting rod contains a transmission channel and an airflow channel, both of which pass through the outer wall of the hollow cylinder. The butterfly plate is located inside the hollow cylinder. The pneumatic actuator is positioned at the top of the connecting rod, and the valve stem, located within the transmission channel, drives the pneumatic actuator to the butterfly plate. The pneumatic actuator is connected to an air source via the first air source valve. The sealing assembly includes a second air source valve and a sealing ring, the sealing ring being made of an elastic material; the sealing ring is sleeved on the inner wall of the valve body and located between the valve body and the butterfly plate, the sealing ring having an extension channel corresponding to the transmission channel for the valve stem to pass through; the sealing ring has multiple cavities arranged circumferentially, the cavities communicating with the airflow channel; the second air source valve is connected to the air source, the outside environment, and the airflow channel; the second air source valve is inflated when connected to the air source, and deflated when connected to the outside environment; When the switch valve for sodium persulfate production is in the discharge state, the second gas source valve intermittently fills and de-fills the cavity. The intermittent filling forms a sealing ring, causing the sodium persulfate crystals inside the switch valve to detach and be carried away by the fluid during discharge. If the switch valve for sodium persulfate production is in the closed state and leakage occurs, the second gas source valve connects the gas source to fill the cavity, thereby sealing the leak and then stopping the filling.

2. The switching valve for sodium persulfate production according to claim 1, characterized in that, The sealing assembly also includes a thermostat, and the second gas source valve is connected to the airflow channel through the thermostat. The thermostat regulates the gas from the gas source before it enters the cavity.

3. The switching valve for sodium persulfate production according to claim 2, characterized in that, A temperature sensor is also provided inside the cavity of the sealing ring. The temperature sensor is electrically connected to the thermostat via a wire, which is arranged along the airflow channel.

4. The switching valve for sodium persulfate production according to claim 3, characterized in that, The temperature sensor obtains the internal temperature of the sealing ring. If it is higher than the working temperature range of the sealing ring, the temperature controller will cool down the gas from the gas source before it enters the cavity; if it is lower than the working temperature range of the sealing ring, the temperature controller will heat up the gas from the gas source before it enters the cavity.

5. The switching valve for sodium persulfate production according to claim 1, characterized in that, The sealing ring corresponding to the transmission channel is interference-fitted with the valve stem.

6. The switching valve for sodium persulfate production according to claim 1, characterized in that, The sealing ring is fixedly sealed to the inner wall of the hollow cylinder; When the sealing ring is fixed, it aligns and connects the cavity with the airflow channel; different cavities are interconnected.

7. The switching valve for sodium persulfate production according to claim 6, characterized in that, The inner wall of the hollow cylinder is polished.

8. The switching valve for sodium persulfate production according to claim 1, characterized in that, The sealing ring is made of fluororubber or perfluoroether rubber.

9. The switching valve for sodium persulfate production according to claim 1, characterized in that, The valve stem and butterfly plate are made of 316L stainless steel.

10. The switching valve for sodium persulfate production according to claim 1, characterized in that, The valve stem and butterfly plate are coated with polytetrafluoroethylene.

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