Safe air inlet structure for vacuum dryer

Abstract

The utility model discloses a safety air inlet structure for a vacuum drier, which comprises the vacuum drier, the vacuum drier is provided with an air inlet and an air outlet, the air inlet is hermetically connected with a nitrogen inlet pipe through a flange, the nitrogen inlet pipe is provided with an air inlet control valve, the air outlet is hermetically connected with a nitrogen exhaust pipe through a flange, and the nitrogen exhaust pipe is provided with an air outlet control valve. The exhaust port is provided with a pressure sensor, the air inlet control valve is in linkage fit with the pressure sensor through an external controller, the exhaust port is further connected with a safety branch in parallel, the safety branch is provided with a filter, double insurance is formed through the pressure sensor and the safety branch, linkage is carried out through the pressure sensor under the normal condition, and the safety branch is provided with a filter. And when the pressure sensor breaks down or the pressure in the equipment cannot be confirmed, the safety valve of the safety branch is used for reacting, and when the pressure is too large, the safety branch is automatically communicated, so that the safety and stability of the device are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field related to vacuum drying of chemical synthesis, in particular to a safe air intake structure for a vacuum dryer. Background Art

[0002] The existing double-cone vacuum dryer has back-blowing operation and air-breaking operation. The back-blowing operation is to clean the material on the double-cone inner filter device during the drying process by back-blowing with nitrogen; the air-breaking operation is to close the vacuum valve after the drying is completed and restore the pressure to normal with nitrogen.

[0003] The above process has the following defects: during the back-blowing and breaking-air processes, the pressure value is only detected by the pressure sensor. If the pressure sensor fails, the pressure inside the equipment cannot be confirmed, overpressure causes damage to the equipment, and there are also safety hazards. Utility Model Content

[0004] The utility model provides a safe air intake structure for a vacuum dryer, aiming to solve the problem that the existing double-cone vacuum dryer only detects pressure changes through a pressure sensor during back-blowing or air-breaking operations, resulting in safety hazards.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A safety air intake structure for a vacuum dryer includes a vacuum dryer, wherein the vacuum dryer is provided with an air inlet and an exhaust port, the air inlet being sealedly connected to a nitrogen air inlet pipe via a flange, and the nitrogen air inlet pipe being provided with an air intake control valve, the exhaust port being sealedly connected to a nitrogen air exhaust pipe via a flange, and the exhaust port being provided with a pressure sensor, the air intake control valve being linked with the pressure sensor via an external controller, the exhaust port being further connected in parallel with a safety branch having a safety valve, and the safety branch being provided with a filter.

[0007] Preferably, the safety branch includes a safety valve provided at the exhaust port, and the air inlet end of the safety valve is sealed and connected to the exhaust port, and the air outlet end of the safety valve is sealed and connected to the exhaust branch pipe through a flange, and a filter is provided on the exhaust branch pipe.

[0008] More preferably, the safety valve is located on a side of the exhaust port close to the vacuum dryer, and the pressure sensor is located on a side of the exhaust port away from the vacuum dryer.

[0009] Furthermore, the exhaust branch pipe extends upward, and the end of the exhaust branch pipe directly leads to the atmosphere.

[0010] Furthermore, a plurality of activated carbon filter layers are provided in the filter.

[0011] Specifically, the external controller is a PLC controller.

[0012] More specifically, the intake control valve is a solenoid valve.

[0013] Beneficial effects of the utility model:

[0014] 1. The utility model detects the pressure inside the device through the pressure sensor set at the exhaust port, and links the air intake control valve for nitrogen to enter. When the internal pressure exceeds the set value, the air intake control valve is closed in time to prevent safety accidents and equipment damage caused by overpressure;

[0015] 2. The utility model uses a safety branch circuit containing a safety valve as a second layer of insurance. When the pressure sensor fails or is damaged and cannot effectively detect the gas pressure, the safety valve will monitor it in time. When the internal pressure exceeds the set pressure of the safety valve, the safety valve will open and automatically release the pressure through the safety branch circuit to prevent safety accidents and equipment damage caused by overpressure.

[0016] 3. The safety branch of the utility model is provided with a filter, and the depressurized nitrogen can be directly discharged into the atmosphere after being filtered, thus preventing pollution and facilitating disposal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation of the utility model on a vacuum dryer;

[0018] In the figure: 1. Vacuum dryer; 2. Air inlet; 3. Exhaust port; 4. Nitrogen inlet pipe; 5. Air inlet control valve; 6. Nitrogen exhaust pipe; 7. Safety branch; 8. Filter; 9. Safety valve; 10. Exhaust branch; 11. Pressure sensor. DETAILED DESCRIPTION

[0019] As follows, embodiments are further described with reference to the accompanying drawings.

[0020] like Figure 1As shown, as a preferred embodiment 1, a safety air intake structure for a vacuum dryer includes a vacuum dryer 1, wherein the vacuum dryer 1 is provided with an air inlet 2 for nitrogen to be introduced during air breaking and back blowing, and an exhaust port 3 for nitrogen to be discharged. The air inlet 2 is sealed with a nitrogen air inlet pipe 4 through a flange, and an air intake control valve 5 is provided on the nitrogen air inlet pipe 4. The exhaust port 3 is sealed with a nitrogen air exhaust pipe 6 through a flange, and a pressure sensor 11 is provided on the exhaust port 3. The air intake control valve 5 is linked with the pressure sensor 11 through an external controller to form a first-level monitoring, and the internal pressure is monitored by the pressure sensor 11. When the pressure exceeds the index value, the intake control valve 5 is closed through the linkage of the external controller. A safety branch 7 with a safety valve 9 is also connected in parallel to the exhaust port 3 to form a secondary monitoring system. When the pressure sensor 11 cannot effectively monitor, the safety branch 7 assists in pressure relief. When the internal pressure exceeds the safety valve 9, the safety valve 9 automatically opens to relieve pressure and automatically closes after the pressure relief is completed to prevent safety accidents and equipment damage caused by failure of the first-level monitoring. A filter 8 is provided on the safety branch 7 to help process the depressurized nitrogen. A small amount of depressurized nitrogen is directly discharged into the atmosphere after treatment, which is convenient for treatment and avoids polluting the environment or causing accidents.

[0021] The safety branch 7 includes a safety valve 9 provided at the exhaust port 3, and the air inlet end of the safety valve 9 is sealed and connected to the exhaust port 3, and the air outlet end of the safety valve 9 is sealed and connected to the exhaust branch pipe 10 through a flange. The exhaust branch pipe 10 is provided with a filter 8 to ensure the connectivity of the safety branch 7.

[0022] The safety valve 9 is located on the exhaust port 3 near the vacuum dryer 1, and the pressure sensor 11 is located on the exhaust port 3 away from the vacuum dryer 1. When the pressure sensor 11 is effective, monitoring is performed through the pressure sensor 11. When the pressure sensor 11 fails, it is ensured that the gas can be depressurized from the safety valve 9 in time.

[0023] Preferably, the set pressure of the safety valve 9 is slightly greater than the set value of the pressure sensor 11, ensuring that during normal use, monitoring is performed preferentially through the pressure sensor 11. At this time, the safety valve 9 is not started, the safety branch 7 remains disconnected, and when the pressure sensor 11 fails and causes the internal air pressure to rise slightly and exceed the set pressure of the safety valve 9, the safety valve 9 automatically opens, connecting the safety branch 7 with the exhaust port 3 to complete automatic pressure relief.

[0024] The nitrogen exhaust pipe 6 is provided with a control valve to facilitate the control of back blowing and air breaking.

[0025] The exhaust branch pipe 10 extends upward, and the end of the exhaust branch pipe 10 is directly connected to the atmosphere, which is convenient for the direct discharge of the decompression gas and ensures a smooth decompression process. The decompressed nitrogen is directly filtered and discharged into the atmosphere to prevent pollution and facilitate treatment.

[0026] The filter 8 is provided with a plurality of activated carbon filter layers to ensure the filtering effect.

[0027] The external controller is a PLC controller, which is convenient for forming linkage control.

[0028] The air intake control valve 5 is a solenoid valve, which facilitates linkage control.

[0029] The pressure sensor 11 is an existing pipeline gas pressure sensor.

[0030] As a preferred embodiment 2, back-blowing operation: during the drying process, the material on the double-cone inner filter device is cleaned and back-blown with nitrogen (0.25 MPa).

[0031] Air breaking operation: After drying, the vacuum valve needs to be closed and nitrogen (0.25MPa) is used to restore the pressure to normal.

[0032] At this time, the set pressure of the safety valve 9 is set to 0.05 MPa, and the monitoring setting value at the pressure sensor 11 does not exceed 0.05 MPa.

[0033] The working principle of this utility model:

[0034] The utility model provides a safe air intake structure for a vacuum dryer. The pressure condition inside the device is detected by a pressure sensor 11 provided at the exhaust port 3, and the air intake control valve 5 for nitrogen to enter is linked. When the internal pressure exceeds the set value, the air intake control valve 5 is closed in time to prevent safety accidents and equipment damage caused by overpressure.

[0035] The safety branch 7 containing the safety valve 9 serves as a second layer of insurance. When the pressure sensor 11 fails or is damaged and cannot effectively detect the gas pressure, the safety valve 9 monitors the pressure in time. When the internal pressure exceeds the set pressure of the safety valve 9, the safety valve 9 opens and automatically releases the pressure through the safety branch 7, preventing safety accidents and equipment damage caused by overpressure.

[0036] The safety branch 7 is provided with a filter 8, and the depressurized nitrogen can be directly discharged into the atmosphere after being filtered, so as to prevent pollution and facilitate disposal.

Claims

1. A safety air intake structure for a vacuum dryer, comprising a vacuum dryer (1), wherein the vacuum dryer (1) is provided with an air intake port (2) and an air exhaust port (3), and wherein: The air inlet (2) is sealedly connected to the nitrogen air inlet pipe (4) via a flange, and the nitrogen air inlet pipe (4) is provided with an air inlet control valve (5). The air outlet (3) is sealedly connected to the nitrogen air outlet pipe (6) via a flange, and the air outlet (3) is provided with a pressure sensor (11). The air inlet control valve (5) is linked to the pressure sensor (11) via an external controller. A safety branch (7) provided with a safety valve (9) is also connected in parallel to the air outlet (3), and a filter (8) is provided on the safety branch (7).

2. The safety air intake structure for a vacuum dryer according to claim 1, characterized in that: The safety branch (7) includes a safety valve (9) provided at the exhaust port (3), wherein the air inlet end of the safety valve (9) is sealedly connected to the exhaust port (3), and the air outlet end of the safety valve (9) is sealedly connected to an exhaust branch pipe (10) via a flange, and a filter (8) is provided on the exhaust branch pipe (10).

3. The safety air intake structure for a vacuum dryer according to claim 2, characterized in that: The safety valve (9) is located on the exhaust port (3) on a side close to the vacuum dryer (1), and the pressure sensor (11) is located on the exhaust port (3) on a side away from the vacuum dryer (1).

4. The safety air intake structure for a vacuum dryer according to claim 3, characterized in that: The exhaust branch pipe (10) extends upward, and the end of the exhaust branch pipe (10) directly leads to the atmosphere.

5. The safety air intake structure for a vacuum dryer according to claim 4, characterized in that: Several activated carbon filter layers are provided in the filter (8).

6. The safety air intake structure for a vacuum dryer according to claim 5, characterized in that: The external controller is a PLC controller.

7. The safety air intake structure for a vacuum dryer according to claim 6, characterized in that: The air intake control valve (5) is a solenoid valve.

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