Airflow check valve of red phosphorus flame retardant vacuum drier

Abstract

The utility model discloses an airflow check valve of a red phosphorus flame retardant vacuum drying machine, which belongs to the technical field of red phosphorus flame retardant processing equipment and comprises the red phosphorus flame retardant vacuum drying machine, the vacuum drying machine is erected on a rack, and a conveying belt is arranged at a discharge port below the vacuum drying machine. An airflow check valve body is arranged on a pipe body of the vacuum dryer air exhaust pipeline, the air exhaust pipeline is externally connected with a buffer tank body, the upper end of the buffer tank body is communicated with a vacuumizing mechanical pump through a pipeline, the lower end of the buffer tank body is communicated with an exhaust pipeline, and a pressure valve is arranged on the exhaust pipeline. The rack is connected with an electromagnetic relay through a clamping base, and the electromagnetic relay is externally connected with a power source and the square suction cup electromagnet through circuits. According to the airflow check valve, on one hand, the electromagnetic chuck is arranged to be in linkage with a factory power supply, when a factory is powered off, the airflow check valve body is locked in time, meanwhile, the buffer tank is specially designed and used for temporarily buffering backflow gas, and safety is further improved.

Description

Technical Field

[0001] This utility model relates to the technical field of red phosphorus flame retardant processing equipment, and more specifically, to an airflow check valve for a red phosphorus flame retardant vacuum dryer. Background Technology

[0002] Vacuum dryers are a common type of drying and dehydration equipment used in the processing of flame retardants. They work by creating a pressure difference between the inside and outside of a rotating drum by drawing a vacuum inside the drum. This causes flame retardant particles to adhere to the surface of the filter cloth around the drum, while the liquid passes through the filter cloth and enters the drum, where it is collected through a recovery port. The flame retardant particles remaining on the filter cloth are scraped off by an electric scraper and fall onto a conveyor belt, thus achieving the dehydration process.

[0003] In actual dehydration, if there is an unexpected power outage in the factory area, the inside of the drum of the vacuum dryer will be a vacuum, and the air extraction pipe is prone to backflow, which will damage the internal components and pipes of the drum. Therefore, a check valve needs to be installed on the air extraction pipe of the vacuum dryer. However, the traditional check valve only relies on its own gravity to close, and the closure is not tight enough, so the backflow of gas will still occur, and the backflow prevention effect is not good. Utility Model Content

[0004] The purpose of this invention is to provide a backflow preventer for a vacuum dryer of red phosphorus flame retardant. This backflow preventer is linked to the power supply of the plant by setting an electromagnetic chuck. When the plant loses power, the backflow preventer body is locked in time. At the same time, a buffer tank is specially designed to temporarily buffer the backflow of gas, further improving safety.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A check valve for airflow in a vacuum dryer for red phosphorus flame retardants includes a vacuum dryer for red phosphorus flame retardants. The vacuum dryer is mounted on a frame, and a conveyor belt is located at the discharge port below the vacuum dryer. The vacuum dryer's exhaust pipe is equipped with an airflow check valve body, and a buffer tank is connected to the outside of the exhaust pipe. The upper end of the buffer tank is connected to a vacuum pump via a pipeline, and the lower end of the buffer tank is connected to an exhaust pipe. A pressure valve is installed on the exhaust pipe. An electromagnetic relay is connected to the frame via a clamping seat. The electromagnetic relay is connected to an external power supply and a square suction cup electromagnet via a circuit.

[0007] As a further optimization of this solution, the pressure valve includes a sealing top block, a spring, and a base. The base is fixed inside the exhaust pipe by connecting rods around the perimeter, and the top block is connected to the upper surface of the base by a spring. In the initial state, the sealing top block is pressed against the air outlet at the lower end of the buffer tank.

[0008] As a further optimization of this solution, the central area inside the airflow check valve body is a rectangular through groove, and the two sides of the rectangular through groove are symmetrical frustum-shaped through grooves and circular through grooves. Several spaced square suction cup electromagnets are embedded in the bottom surface of the rectangular through groove. At the lower end of the intersection of the rectangular through groove and the frustum-shaped through groove on one side, the two sides are connected to the mounting shaft inward through the mounting base. A reset torsion spring is mounted on the mounting shaft, and a rectangular metal baffle is mounted on the reset torsion spring. In the initial state, the reset torsion spring causes the rectangular metal baffle to flip upward to the position of the limit stop bar. The limit stop bar is fixed at the upper end of the intersection of the rectangular through groove and the frustum-shaped through groove on one side.

[0009] As a further optimization of this solution, the rectangular metal baffle has protrusions machined outward on both sides, and the protrusions are slidably embedded into the arc-shaped guide grooves machined on the surface of the rectangular through grooves on both sides.

[0010] As a further optimization of this solution, after the square suction cup electromagnet is energized, the rectangular metal baffle is horizontally adsorbed onto the lower surface of the rectangular through groove through the magnetic strip, and the mounting shaft is close to the side of the vacuum dryer.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0012] In the airflow check valve structure of this utility model, by designing the airflow check valve body, buffer tank, and pressure valve, when the factory loses power, because the inside of the drum is a vacuum, gas backflows into the exhaust pipe. At this time, the square suction cup electromagnet is disconnected and energized. Under the elastic torque of the reset torsion spring, the rectangular metal baffle flips upward to the position of the limit bar, blocking the backflowing gas and preventing the gas from further entering the inside of the vacuum dryer's drum. At the same time, the blocked gas enters the buffer tank for buffering. When the gas pressure inside the buffer tank is high and exceeds the pressure valve threshold, the gas will push down to open the sealing top block of the pressure valve and be discharged from the exhaust pipe to dissipate energy, which is used to temporarily buffer the backflowing gas and further improve safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installation structure of the airflow check valve body and buffer tank of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the pressure valve of this utility model (with part of the pressure valve shell removed);

[0015] Figure 3 This is a schematic diagram of the internal structure of the airflow check valve body when energized (with the outer shell of the airflow check valve body removed);

[0016] Figure 4This is a schematic diagram of the internal structure of the airflow check valve body when the power is off (with the outer shell of the airflow check valve body removed);

[0017] In the diagram: 1. Vacuum dryer; 2. Conveyor belt; 3. Frame; 4. Clamping seat; 5. Electromagnetic relay; 6. Wiring; 7. Airflow check valve body; 8. Buffer tank; 9. Pipeline; 10. Exhaust pipe; 11. Pressure valve; 12. Sealing top block; 13. Spring; 14. Connecting rod; 15. Square suction cup electromagnet; 16. Rectangular metal baffle; 17. Mounting seat; 18. Return torsion spring; 19. Protrusion; 20. Arc-shaped guide groove; 21. Limiting stop bar; 22. Magnetic suction bar; 71. Circular through groove; 72. Frustum-shaped through groove; 73. Rectangular through groove. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0019] To address the issue of unexpected power outages in the existing factory area, the vacuum dryer's drum is under vacuum, making it prone to backflow of air into the extraction pipe, which can damage internal components and pipes. Therefore, a check valve needs to be installed on the vacuum dryer's extraction pipe. However, traditional check valves rely solely on their own weight to close, resulting in insufficient sealing and the continued occurrence of gas backflow, thus failing to provide effective backflow prevention.

[0020] like Figure 1 As shown, this application includes a red phosphorus flame retardant vacuum dryer 1. The vacuum dryer 1 is mounted on a frame 3 and a conveyor belt 2 is provided at the discharge port position below the vacuum dryer 1. The vacuum dryer 1 has an air flow check valve body 7 on the exhaust pipe and a buffer tank 8 connected to the outside of the exhaust pipe. The upper end of the buffer tank 8 is connected to a vacuum mechanical pump through a pipe 9 and the lower end of the buffer tank 8 is connected to an exhaust pipe 10. A pressure valve 11 is provided on the exhaust pipe 10. An electromagnetic relay 5 is connected to the frame 3 through a clamping seat 4. The electromagnetic relay 5 is connected to an external power supply and a square suction cup electromagnet 15 through a line 6.

[0021] like Figure 2 As shown, the pressure valve 11 includes a sealing top block 12, a spring 13 and a base. The base is fixed inside the exhaust pipe by a connecting rod 14 around the perimeter, and the top block 12 is connected to the upper surface of the base by the spring 13. In the initial state, the sealing top block 12 is pressed against the air outlet at the lower end of the buffer tank 8.

[0022] like Figure 3As shown, the central area of ​​the airflow check valve body 7 is a rectangular through groove 73, and the two sides of the rectangular through groove 73 are symmetrical frustum-shaped through grooves 72 and circular through grooves 71. Several spaced square suction cup electromagnets 15 are embedded in the bottom surface of the rectangular through groove 73. At the lower end of the junction of the rectangular through groove 73 and the frustum-shaped through groove 72 on one side, the two sides are connected to the mounting shaft through the mounting seat 17. The mounting shaft is fitted with a reset torsion spring 18, and a rectangular metal baffle 16 is installed on the reset torsion spring 18. In the initial state, the reset torsion spring 18 causes the rectangular metal baffle 16 to flip upward to the position of the limit bar 21. The limit bar 21 is fixed at the upper end of the junction of the rectangular through groove 73 and the frustum-shaped through groove 72 on one side. Both sides of the rectangular metal baffle 16 are machined with protrusions 19. The protrusions 19 slide into the arc-shaped guide grooves 20 machined on the surface of the rectangular through grooves 73 on both sides.

[0023] Specifically, the square suction cup electromagnet 15 can be the DX402010 model, with the following dimensions: 40mm long * 20mm wide * 10mm thick. Applicable voltage: DC3V~DC48V. Stroke force: 0mm > 10N. Workpiece characteristics: The object to be attracted must be medium / low carbon steel, with a smooth surface and an area larger than the 22 sides of the magnetic strip. Operating environment temperature: -20~40 degrees Celsius, humidity: 5%RH-85%RH.

[0024] like Figure 3 As shown, after the square suction cup electromagnet 15 is energized, the rectangular metal baffle 16 is horizontally attracted to the lower surface of the rectangular through groove 73 by the magnetic strip 22, with the mounting shaft close to the side of the vacuum dryer 1.

[0025] like Figure 4 As shown, when the factory experiences a power outage, the inside of the drum of the vacuum dryer 1 is under vacuum, causing backflow of gas into the extraction pipe. At this time, the square suction cup electromagnet 15 is de-energized, and the rectangular metal baffle 16 flips upward to the position of the limit bar 21 under the elastic torque of the reset torsion spring 18, blocking the backflow of gas and preventing it from further entering the drum of the vacuum dryer 1. At the same time, the blocked gas enters the buffer tank 8 for buffering. When the gas pressure inside the buffer tank 8 is high and exceeds the threshold of the pressure valve 11, the gas will push down to open the sealing top block 12 of the pressure valve 11 and be discharged from the exhaust pipe 10 to dissipate energy, temporarily buffering the backflow of gas and further improving safety.

[0026] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0027] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A check valve for airflow in a vacuum dryer for red phosphorus flame retardants, comprising a vacuum dryer for red phosphorus flame retardants, wherein the vacuum dryer is mounted on a frame and a conveyor belt is provided at the discharge port below the vacuum dryer, characterized in that: The vacuum dryer has an airflow check valve on its exhaust pipe and a buffer tank connected to the outside of the exhaust pipe. The upper end of the buffer tank is connected to a vacuum pump through a pipeline, and the lower end of the buffer tank is connected to an exhaust pipe. A pressure valve is installed on the exhaust pipe. An electromagnetic relay is connected to the frame through a clamping seat. The electromagnetic relay is connected to an external power supply and a square suction cup electromagnet through a circuit.

2. The airflow check valve for a red phosphorus flame retardant vacuum dryer according to claim 1, characterized in that: The pressure valve includes a sealing top block, a spring, and a base. The base is fixed inside the exhaust pipe by connecting rods around the perimeter, and the top block is connected to the upper surface of the base by a spring. In the initial state, the sealing top block is pressed against the air outlet at the lower end of the buffer tank.

3. The airflow check valve for a red phosphorus flame retardant vacuum dryer according to claim 2, characterized in that: The central area of ​​the airflow check valve body is a rectangular through groove, and the two sides of the rectangular through groove are symmetrical frustum-shaped through grooves and circular through grooves. Several spaced square suction cup electromagnets are embedded in the bottom surface of the rectangular through groove. At the lower end of the intersection of the rectangular through groove and the frustum-shaped through groove on one side, the two sides are connected to the mounting shaft inward through the mounting base. A reset torsion spring is mounted on the mounting shaft, and a rectangular metal baffle is mounted on the reset torsion spring. In the initial state, the reset torsion spring causes the rectangular metal baffle to flip upward to the position of the limit stop bar. The limit stop bar is fixed at the upper end of the intersection of the rectangular through groove and the frustum-shaped through groove on one side.

4. The airflow check valve for a red phosphorus flame retardant vacuum dryer according to claim 3, characterized in that: The rectangular metal baffle has protrusions on both sides, and the protrusions slide into the inside of the arc-shaped guide grooves machined on the surface of the rectangular through grooves on both sides.

5. The airflow check valve for a red phosphorus flame retardant vacuum dryer according to claim 4, characterized in that: When the square suction cup electromagnet is energized, it uses magnetic strips to horizontally attach the rectangular metal baffle to the lower surface of the rectangular through groove, with the mounting shaft located near the side of the vacuum dryer.

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