Air source filtering device of pneumatic actuator

Abstract

The utility model belongs to the technical field of air source filtering of pneumatic actuators, and particularly relates to an air source filtering device of a pneumatic actuator. Comprising a main pipeline, two filters are connected to the main pipeline in parallel, the air outlet ends of the two filters are jointly connected with a buffer tank and a pneumatic actuator in parallel through the main pipeline, the buffer tank is connected with a gas heater through a back flushing pipeline, and the gas heater is connected to the main pipeline at the air outlet ends of the two filters through the back flushing pipeline. The pollution discharge ends of the two filters are connected with the water seal tank through pollution discharge pipelines, the filters are connected in parallel with a pressure difference transmitter through a detection pipeline, and a back flushing pipeline at the output end of the gas heater is connected with a washing pipeline. According to the utility model, air source filtration is carried out through one standby filter and one used filter, so that the situation that an actuator cannot work normally and safe and stable operation of equipment is influenced after the filters are blocked is prevented, and the filters can automatically carry out blowback, backwashing and drying operations, so that the workload is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of air source filtration technology for pneumatic actuators, and particularly relates to an air source filtration device for pneumatic actuators. Background Technology

[0002] Pneumatic actuators are devices that use air pressure to open, close, or regulate valves; they are also called pneumatic actuators or pneumatic devices. Currently, steel plants have several pneumatic actuators installed on their equipment. The air supply to the actuators is filtered before being delivered, but the design only includes one pipeline. When the air supply is dirty, the filter is easily clogged, causing the actuator to malfunction and affecting the safe and stable operation of the equipment. Clogged filters require manual disassembly and cleaning of the filter element, which is time-consuming, labor-intensive, and increases workload. Summary of the Invention

[0003] The purpose of this invention is to provide a pneumatic actuator air source filtration device to solve the problems existing in the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A pneumatic actuator air source filtration device includes a main pipeline with two filters connected in parallel on the main pipeline. The outlets of the two filters are connected in parallel to a buffer tank and a pneumatic actuator via the main pipeline. The buffer tank is connected to a gas heater via a backflush pipeline. The gas heater is connected to the main pipeline at the outlets of the two filters via a backflush pipeline. The drain ends of the two filters are connected to a water seal tank via a drain pipeline. The filters are connected in parallel to a differential pressure transmitter via a detection pipeline. A water washing pipeline is connected to the backflush pipeline at the output end of the gas heater.

[0006] Furthermore, solenoid valve one and solenoid valve two are installed on the main air inlet and outlet of the filter, respectively, and solenoid valve three and solenoid valve four are installed on the air inlet and outlet of the buffer tank, respectively.

[0007] Furthermore, the connection between the detection pipeline and the main pipeline is located at both ends of the filter and between solenoid valve one and solenoid valve two. Solenoid valve five is installed on the detection pipelines at both ends of the differential pressure transmitter.

[0008] Furthermore, a solenoid valve six is ​​installed on the backflush pipe at the gas heater outlet. Solenoid valve six is ​​connected in parallel to two solenoid valves seven through the backflush pipe. The two solenoid valves seven are respectively connected to the main pipes at the gas outlets of the two filters through the backflush pipes. The connection between the backflush pipe and the main pipe is located on the main pipe between the detection pipe and solenoid valve two.

[0009] Furthermore, the water washing pipeline is connected to the backflush pipeline between solenoid valve six and solenoid valve seven, and solenoid valve eight is installed on the water washing pipeline.

[0010] Furthermore, solenoid valve seven is a pulse-type solenoid valve.

[0011] Furthermore, a solenoid valve is installed near the filter in the sewage pipe, and the output end of the sewage pipe extends into the water seal box.

[0012] Furthermore, solenoid valves 1, 2, 3, 4, 5, 6, 7, 8, and 9, as well as the differential pressure transmitter, are all electrically connected to the DCS control system.

[0013] This utility model has the following beneficial effects:

[0014] 1. This utility model uses a backup filter to filter the air source, preventing the actuator from malfunctioning due to filter blockage and affecting the safe and stable operation of the equipment.

[0015] 2. The differential pressure transmitter monitors the pressure difference between the inlet and outlet of the filter and issues an alarm when an abnormality occurs. When the pressure difference is lower than the lower limit, it automatically switches to another filter for filtration, so that the staff can keep abreast of the filter's operating status.

[0016] 3. Pneumatic actuators require stable compressed air during operation. Therefore, a buffer tank is used to store filtered compressed air. Compressed air from the buffer tank is used during backflushing to prevent unstable air pressure caused by directly using compressed air from the main pipeline.

[0017] 4. By adding a backflush pipeline, backflush can be performed after the filter becomes clogged, eliminating the need for manual cleaning and reducing workload.

[0018] 5. By adding a water washing pipeline, backwashing can be performed when the filter becomes severely clogged, eliminating the need for manual cleaning and reducing workload.

[0019] 6. After backwashing, the compressed air is dried using an air heater to prevent excessive humidity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] The components are as follows: 1. Solenoid valve one; 2. Solenoid valve two; 3. Solenoid valve three; 4. Solenoid valve four; 5. Solenoid valve five; 6. Solenoid valve six; 7. Solenoid valve seven; 8. Solenoid valve eight; 9. Solenoid valve nine; 10. Main pipeline; 11. Filter; 12. Buffer tank; 13. Pneumatic actuator; 14. Backflush pipeline; 15. Gas heater; 16. Sewage pipeline; 17. Water seal box; 18. Differential pressure transmitter; 19. Water washing pipeline; 20. Detection pipeline. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the scope of the utility model.

[0023] like Figure 1 As shown, a pneumatic actuator air source filtration device includes a main pipeline 10, with two filters 11 connected in parallel on the main pipeline 10. The outlets of the two filters 11 are connected in parallel to a buffer tank 12 and a pneumatic actuator 13 via the main pipeline 10. The pneumatic actuator 13 requires stable compressed air during operation, therefore the buffer tank 12 is used to store filtered compressed air. During backflushing, the compressed air in the buffer tank 12 is used to prevent pressure instability caused by directly using the compressed air in the main pipeline 10. The buffer tank 12 is connected to a gas heater 15 via a backflushing pipeline 14. The gas heater 15 is used to heat the compressed air to dry the pipeline and filters 11. The gas heater 15 is connected to the main pipeline 10 at the outlet of the two filters 11 via the backflush pipeline 14. The drain ends of the two filters 11 are connected to the water seal box 17 via the drain pipeline 16. The filters 11 are connected to the differential pressure transmitter 18 via the detection pipeline 20. A water washing pipeline 19 is connected to the backflush pipeline 14 at the output end of the gas heater 15. The water washing pipeline 19 is used to wash the filters 11.

[0024] Solenoid valve 1 and solenoid valve 2 are installed on the main pipeline 10 at the air inlet and outlet ends of filter 11, respectively. Solenoid valve 3 and solenoid valve 4 are installed on the air inlet and outlet ends of buffer tank 12, respectively.

[0025] The connection between the detection pipeline 20 and the main pipeline 10 is located at both ends of the filter 11 and between solenoid valve 1 and solenoid valve 2. Solenoid valve 5 is installed on the detection pipeline 20 at both ends of the differential pressure transmitter 18.

[0026] A solenoid valve 6 is installed on the backflush pipe 14 at the outlet of the gas heater 15. The solenoid valve 6 is connected to two solenoid valves 7 through the backflush pipe 14. The two solenoid valves 7 are connected to the main pipes 10 at the outlets of the two filters 11 through the backflush pipe 14 respectively. The connection between the backflush pipe 14 and the main pipe 10 is located on the main pipe 10 between the detection pipe 20 and the solenoid valve 2.

[0027] The water washing pipeline 19 is connected to the backflush pipeline 14 between solenoid valve 6 and solenoid valve 7, and solenoid valve 8 is installed on the water washing pipeline 19.

[0028] Solenoid valve 7 is a pulse solenoid valve. The pulse solenoid valve can perform pulse feeding, thereby impacting the filter element with pulses, making it easier for impurities to leave the filter element.

[0029] A solenoid valve 9 is installed near the filter 11 on the drain pipe 16, and the output end of the drain pipe 16 extends into the water seal box 17. When using compressed air for backflushing, direct discharge would cause dust pollution and a poor working environment. By pouring the compressed air into the water seal box 17, impurities remain in the water while the air is discharged, thus preventing dust pollution.

[0030] Solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, solenoid valve 5, solenoid valve 6, solenoid valve 7, solenoid valve 8, solenoid valve 9, and differential pressure transmitter 18 are all electrically connected to the DCS control system.

[0031] The working principle of this utility model is as follows:

[0032] During use, water is filled into the water seal tank 17, ensuring the water level covers the outlet of the drain pipe 16. Under normal use, one of the two filters 11 is in standby mode. When one filter 11 becomes clogged, the DCS control system switches the valve to use the other filter 11 for filtration and automatically cleans the clogged valve. The differential pressure transmitter 18 monitors the pressure across the filter 11. When the filter 11 becomes clogged, the pressure difference across it changes. When the pressure difference reaches a set value, the DCS control system issues an alarm. When the pressure difference falls below the lower limit, it automatically switches to the other filter 11 for filtration.

[0033] The valve switching states corresponding to the filter 11 in use are as follows: Solenoid valve 1, solenoid valve 2, and solenoid valve 5 corresponding to the filter 11 are open, and the compressed air is filtered and delivered to each pneumatic actuator 13, so that the pneumatic actuator 13 can work normally.

[0034] The buffer tank 12 is set with a lower limit and an upper limit for air pressure. When the air pressure in the buffer tank 12 is lower than the lower limit, the solenoid valve opens, allowing filtered compressed air to enter the buffer tank 12. When the upper limit is reached, the solenoid valve closes.

[0035] The valve switching status corresponding to the standby filter 11 is as follows: Solenoid valve 1, solenoid valve 2, and solenoid valve 5 corresponding to filter 11 are closed. When filter 11 is not severely clogged, compressed air is used for backflushing. During backflushing, solenoid valves 4, 6, 7, and 9 corresponding to filter 11 are opened. Compressed air in buffer tank 12 backflushes the filter element inside, and the airflow backflushes impurities into water seal box 17 to prevent dust pollution. When filter 11 is severely clogged, solenoid valves 4 and 6 are closed, and solenoid valve 8 is opened. Water is used to backwash the filter element, and the water flow backwashes impurities into water seal box 17. After water washing is completed, solenoid valve 8 is closed, and solenoid valves 4 and 6, as well as the air heater, are opened. The compressed air is heated to push out the water in the pipes and filter 11 and dry them, thus completing the cleaning work.

[0036] The severity of filter 11 clogging can be determined by counting the normal operating time of filter 11. If filter 11 is severely clogged and the backflushing effect is poor, resulting in a shortened operating time, then water should be used for backflushing.

[0037] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention.

[0038] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A pneumatic actuator air source filtration device, characterized in that, The system includes a main pipeline, on which two filters are connected in parallel. The outlets of the two filters are connected in parallel to a buffer tank and a pneumatic actuator via the main pipeline. The buffer tank is connected to a gas heater via a backflush pipeline. The gas heater is connected to the main pipeline at the outlets of the two filters via a backflush pipeline. The drain ends of the two filters are connected to a water seal tank via a drain pipeline. The filters are connected in parallel to a differential pressure transmitter via a detection pipeline. A water washing pipeline is connected to the backflush pipeline at the output end of the gas heater.

2. The pneumatic actuator air source filtration device according to claim 1, characterized in that, Solenoid valve one and solenoid valve two are respectively installed on the main pipelines at the air inlet and air outlet of the filter, and solenoid valve three and solenoid valve four are respectively installed at the air inlet and air outlet of the buffer tank.

3. The pneumatic actuator air source filtration device according to claim 2, characterized in that, The connection between the detection pipeline and the main pipeline is located at both ends of the filter and between solenoid valve one and solenoid valve two. Solenoid valve five is installed on the detection pipelines at both ends of the differential pressure transmitter.

4. The pneumatic actuator air source filtration device according to claim 3, characterized in that, A solenoid valve six is ​​installed on the backflush pipe at the gas heater outlet. The solenoid valve six is ​​connected in parallel to two solenoid valves seven through the backflush pipe. The two solenoid valves seven are respectively connected to the main pipes at the gas outlets of the two filters through the backflush pipes. The connection between the backflush pipe and the main pipe is located on the main pipe between the detection pipe and the solenoid valve two.

5. The pneumatic actuator air source filtration device according to claim 4, characterized in that, The water washing pipeline is connected to the backflush pipeline between solenoid valve six and solenoid valve seven, and solenoid valve eight is installed on the water washing pipeline.

6. The pneumatic actuator air source filtration device according to claim 4, characterized in that, The solenoid valve seven is a pulse-type solenoid valve.

7. The pneumatic actuator air source filtration device according to claim 5, characterized in that, A solenoid valve is installed near the filter in the sewage pipe, and the output end of the sewage pipe extends into the water seal box.

8. The pneumatic actuator air source filtration device according to claim 7, characterized in that, Solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, solenoid valve 5, solenoid valve 6, solenoid valve 7, solenoid valve 8, solenoid valve 9, and the differential pressure transmitter are all electrically connected to the DCS control system.

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